[processing] Hide redundant grid creation algorithms

Condenses the duplicate grid algorithms into single algorithms
(one for line, one for polygon), taking the best bits from both
and adding tests

python/plugins/processing/algs/help/qgis.yaml

@@ -99,12 +99,19 @@ qgis:createattributeindex: >
 qgis:createconstantrasterlayer: >
   Given an input raster layer an a value, this algorithm generates a new layer with the same extent and cellsize as the input one, and all cells with the specified value.
 
-qgis:creategrid:
+qgis:creategridlines:
-  This algorithm creates a vector layer with a grid convering a given extent. Features can be lines or polygons, and the shape used in the grid can be rectangles, diamond or hexagons.
+  This algorithm creates a line vector layer with a grid covering a given extent.
 
-  The size of each element in the grid is defined using a horizontal and vertical spaciong.
+  The size of each element in the grid is defined using a horizontal and vertical spacing.
 
-  The CRS of the output layer must be defined. The grid extent and the spacing values are supposed to be expressed in the coordinates and units of this CRS.
+  The CRS of the output layer must be defined. The grid extent and the spacing values must be expressed in the coordinates and units of this CRS.
+
+qgis:creategridpolygon:
+  This algorithm creates a polygon vector layer with a grid covering a given extent. The grid shape can be rectangles, diamond or hexagons.
+
+  The size of each element in the grid is defined using a horizontal and vertical spacing.
+
+  The CRS of the output layer must be defined. The grid extent and the spacing values must be expressed in the coordinates and units of this CRS.
 
 qgis:createpointsalonglines: >
   This algorithms creates a points layer, with points distributed along the lines of an input vector layer. the distance between points (measured along the line) is defined as a parameter.

python/plugins/processing/algs/qgis/GridLine.py

@@ -16,7 +16,6 @@
 *                                                                         *
 ***************************************************************************
 """
-from builtins import range
 
 __author__ = 'Michael Minn'
 __date__ = 'May 2010'
@@ -29,8 +28,17 @@ __revision__ = '$Format:%H$'
 import os
 import math
 
+from qgis.PyQt.QtGui import QIcon
 from qgis.PyQt.QtCore import QVariant
-from qgis.core import QgsRectangle, QgsCoordinateReferenceSystem, Qgis, QgsField, QgsFeature, QgsGeometry, QgsPoint, QgsWkbTypes
+from qgis.core import (QgsRectangle,
+                       QgsCoordinateReferenceSystem,
+                       Qgis,
+                       QgsField,
+                       QgsFeature,
+                       QgsGeometry,
+                       QgsPointV2,
+                       QgsLineString,
+                       QgsWkbTypes)
 from processing.core.GeoAlgorithm import GeoAlgorithm
 from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
 from processing.core.parameters import ParameterExtent
@@ -49,20 +57,21 @@ class GridLine(GeoAlgorithm):
     CRS = 'CRS'
     OUTPUT = 'OUTPUT'
 
-    #def getIcon(self):
+    def getIcon(self):
-    #    return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'vector_grid.png'))
+        return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'vector_grid.png'))
 
     def defineCharacteristics(self):
         self.name, self.i18n_name = self.trAlgorithm('Create grid (lines)')
         self.group, self.i18n_group = self.trAlgorithm('Vector creation tools')
+        self.tags = self.tr('grid,lines,vector,create,fishnet')
 
         self.addParameter(ParameterExtent(self.EXTENT,
                                           self.tr('Grid extent'), optional=False))
         self.addParameter(ParameterNumber(self.HSPACING,
-                                          self.tr('Horizontal spacing'), default=10.0))
+                                          self.tr('Horizontal spacing'), 0.0, 1000000000.0, default=0.0001))
         self.addParameter(ParameterNumber(self.VSPACING,
-                                          self.tr('Vertical spacing'), default=10.0))
+                                          self.tr('Vertical spacing'), 0.0, 1000000000.0, default=0.0001))
-        self.addParameter(ParameterCrs(self.CRS, 'Grid CRS'))
+        self.addParameter(ParameterCrs(self.CRS, 'Grid CRS', 'EPSG:4326'))
 
         self.addOutput(OutputVector(self.OUTPUT, self.tr('Grid'), datatype=[dataobjects.TYPE_VECTOR_LINE]))
 
@@ -77,8 +86,6 @@ class GridLine(GeoAlgorithm):
 
         width = bbox.width()
         height = bbox.height()
-        originX = bbox.xMinimum()
-        originY = bbox.yMaximum()
 
         if hSpacing <= 0 or vSpacing <= 0:
             raise GeoAlgorithmExecutionException(
@@ -95,42 +102,68 @@ class GridLine(GeoAlgorithm):
         fields = [QgsField('left', QVariant.Double, '', 24, 16),
                   QgsField('top', QVariant.Double, '', 24, 16),
                   QgsField('right', QVariant.Double, '', 24, 16),
-                  QgsField('bottom', QVariant.Double, '', 24, 16)
+                  QgsField('bottom', QVariant.Double, '', 24, 16),
+                  QgsField('id', QVariant.Int, '', 10, 0),
+                  QgsField('coord', QVariant.Double, '', 24, 15)
                   ]
 
         writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields,
                                                                      QgsWkbTypes.LineString, crs)
 
-        self._rectangleGridLine(
+        feat = QgsFeature()
-            writer, width, height, originX, originY, hSpacing, vSpacing)
+        feat.initAttributes(len(fields))
 
-    def _rectangleGridLine(self, writer, width, height, originX, originY,
+        count = 0
-                           hSpacing, vSpacing):
+        id = 1
-        ft = QgsFeature()
 
-        columns = int(math.ceil(float(width) / hSpacing))
+        # latitude lines
-        rows = int(math.ceil(float(height) / vSpacing))
+        count_max = height / vSpacing
+        count_update = count_max * 0.10
+        y = bbox.yMaximum()
+        while y >= bbox.yMinimum():
+            pt1 = QgsPointV2(bbox.xMinimum(), y)
+            pt2 = QgsPointV2(bbox.xMaximum(), y)
+            line = QgsLineString()
+            line.setPoints([pt1, pt2])
+            feat.setGeometry(QgsGeometry(line))
+            feat.setAttributes([bbox.xMinimum(),
+                                y,
+                                bbox.xMaximum(),
+                                y,
+                                id,
+                                y])
+            writer.addFeature(feat)
+            y = y - vSpacing
+            id += 1
+            count += 1
+            if int(math.fmod(count, count_update)) == 0:
+                progress.setPercentage(int(count / count_max * 50))
 
-        # Longitude lines
+        progress.setPercentage(50)
-        for col in range(columns + 1):
-            polyline = []
-            x = originX + (col * hSpacing)
-            for row in range(rows + 1):
-                y = originY - (row * vSpacing)
-                polyline.append(QgsPoint(x, y))
 
-            ft.setGeometry(QgsGeometry.fromPolyline(polyline))
+        # longitude lines
-            ft.setAttributes([x, originY, x, originY + (rows * vSpacing)])
+        # counters for progressbar - update every 5%
-            writer.addFeature(ft)
+        count = 0
+        count_max = width / hSpacing
+        count_update = count_max * 0.10
+        x = bbox.xMinimum()
+        while x <= bbox.xMaximum():
+            pt1 = QgsPointV2(x, bbox.yMaximum())
+            pt2 = QgsPointV2(x, bbox.yMinimum())
+            line = QgsLineString()
+            line.setPoints([pt1, pt2])
+            feat.setGeometry(QgsGeometry(line))
+            feat.setAttributes([x,
+                                bbox.yMaximum(),
+                                x,
+                                bbox.yMinimum(),
+                                id,
+                                x])
+            writer.addFeature(feat)
+            x = x + hSpacing
+            id += 1
+            count += 1
+            if int(math.fmod(count, count_update)) == 0:
+                progress.setPercentage(50 + int(count / count_max * 50))
 
-        # Latitude lines
+        del writer
-        for row in range(rows + 1):
-            polyline = []
-            y = originY - (row * vSpacing)
-            for col in range(columns + 1):
-                x = originX + (col * hSpacing)
-                polyline.append(QgsPoint(x, y))
-
-            ft.setGeometry(QgsGeometry.fromPolyline(polyline))
-            ft.setAttributes([originX, y, originX + (col * hSpacing), y])
-            writer.addFeature(ft)

python/plugins/processing/algs/qgis/GridPolygon.py

@@ -16,7 +16,6 @@
 *                                                                         *
 ***************************************************************************
 """
-from builtins import range
 
 __author__ = 'Michael Minn'
 __date__ = 'May 2010'
@@ -29,6 +28,7 @@ __revision__ = '$Format:%H$'
 import os
 import math
 
+from qgis.PyQt.QtGui import QIcon
 from qgis.PyQt.QtCore import QVariant
 from qgis.core import QgsRectangle, QgsCoordinateReferenceSystem, Qgis, QgsField, QgsFeature, QgsGeometry, QgsPoint, QgsWkbTypes
 from processing.core.GeoAlgorithm import GeoAlgorithm
@@ -51,12 +51,13 @@ class GridPolygon(GeoAlgorithm):
     CRS = 'CRS'
     OUTPUT = 'OUTPUT'
 
-    #def getIcon(self):
+    def getIcon(self):
-    #    return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'vector_grid.png'))
+        return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'vector_grid.png'))
 
     def defineCharacteristics(self):
         self.name, self.i18n_name = self.trAlgorithm('Create grid (polygon)')
         self.group, self.i18n_group = self.trAlgorithm('Vector creation tools')
+        self.tags = self.tr('grid,polygons,vector,create,fishnet')
 
         self.types = [self.tr('Rectangle (polygon)'),
                       self.tr('Diamond (polygon)'),
@@ -67,10 +68,10 @@ class GridPolygon(GeoAlgorithm):
         self.addParameter(ParameterExtent(self.EXTENT,
                                           self.tr('Grid extent'), optional=False))
         self.addParameter(ParameterNumber(self.HSPACING,
-                                          self.tr('Horizontal spacing'), default=10.0))
+                                          self.tr('Horizontal spacing'), 0.0, 1000000000.0, 0.0001))
         self.addParameter(ParameterNumber(self.VSPACING,
-                                          self.tr('Vertical spacing'), default=10.0))
+                                          self.tr('Vertical spacing'), 0.0, 1000000000.0, 0.0001))
-        self.addParameter(ParameterCrs(self.CRS, 'Grid CRS'))
+        self.addParameter(ParameterCrs(self.CRS, 'Grid CRS', 'EPSG:4326'))
 
         self.addOutput(OutputVector(self.OUTPUT, self.tr('Grid'), datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
 
@@ -104,7 +105,8 @@ class GridPolygon(GeoAlgorithm):
         fields = [QgsField('left', QVariant.Double, '', 24, 16),
                   QgsField('top', QVariant.Double, '', 24, 16),
                   QgsField('right', QVariant.Double, '', 24, 16),
-                  QgsField('bottom', QVariant.Double, '', 24, 16)
+                  QgsField('bottom', QVariant.Double, '', 24, 16),
+                  QgsField('id', QVariant.Int, '', 10, 0)
                   ]
 
         writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields,
@@ -112,22 +114,27 @@ class GridPolygon(GeoAlgorithm):
 
         if idx == 0:
             self._rectangleGrid(
-                writer, width, height, originX, originY, hSpacing, vSpacing)
+                writer, width, height, originX, originY, hSpacing, vSpacing, progress)
         elif idx == 1:
             self._diamondGrid(
-                writer, width, height, originX, originY, hSpacing, vSpacing)
+                writer, width, height, originX, originY, hSpacing, vSpacing, progress)
         elif idx == 2:
             self._hexagonGrid(
-                writer, width, height, originX, originY, hSpacing, vSpacing)
+                writer, width, height, originX, originY, hSpacing, vSpacing, progress)
 
         del writer
 
     def _rectangleGrid(self, writer, width, height, originX, originY,
-                       hSpacing, vSpacing):
+                       hSpacing, vSpacing, progress):
         ft = QgsFeature()
 
         columns = int(math.ceil(float(width) / hSpacing))
         rows = int(math.ceil(float(height) / vSpacing))
+        cells = rows * columns
+        count_update = cells * 0.05
+
+        id = 1
+        count = 0
 
         for col in range(columns):
             # (column + 1) and (row + 1) calculation is used to maintain
@@ -147,11 +154,15 @@ class GridPolygon(GeoAlgorithm):
                 polyline.append(QgsPoint(x1, y1))
 
                 ft.setGeometry(QgsGeometry.fromPolygon([polyline]))
-                ft.setAttributes([x1, y1, x2, y2])
+                ft.setAttributes([x1, y1, x2, y2, id])
                 writer.addFeature(ft)
+                id += 1
+                count += 1
+                if int(math.fmod(count, count_update)) == 0:
+                    progress.setPercentage(int(count / cells * 100))
 
     def _diamondGrid(self, writer, width, height, originX, originY,
-                     hSpacing, vSpacing):
+                     hSpacing, vSpacing, progress):
         ft = QgsFeature()
 
         halfHSpacing = hSpacing / 2
@@ -160,6 +171,12 @@ class GridPolygon(GeoAlgorithm):
         columns = int(math.ceil(float(width) / halfHSpacing))
         rows = int(math.ceil(float(height) / vSpacing))
 
+        cells = rows * columns
+        count_update = cells * 0.05
+
+        id = 1
+        count = 0
+
         for col in range(columns):
             x1 = originX + ((col + 0) * halfHSpacing)
             x2 = originX + ((col + 1) * halfHSpacing)
@@ -183,11 +200,15 @@ class GridPolygon(GeoAlgorithm):
                 polyline.append(QgsPoint(x1, y2))
 
                 ft.setGeometry(QgsGeometry.fromPolygon([polyline]))
-                ft.setAttributes([x1, y1, x3, y3])
+                ft.setAttributes([x1, y1, x3, y3, id])
                 writer.addFeature(ft)
+                id += 1
+                count += 1
+                if int(math.fmod(count, count_update)) == 0:
+                    progress.setPercentage(int(count / cells * 100))
 
     def _hexagonGrid(self, writer, width, height, originX, originY,
-                     hSpacing, vSpacing):
+                     hSpacing, vSpacing, progress):
         ft = QgsFeature()
 
         # To preserve symmetry, hspacing is fixed relative to vspacing
@@ -200,6 +221,12 @@ class GridPolygon(GeoAlgorithm):
         columns = int(math.ceil(float(width) / hSpacing))
         rows = int(math.ceil(float(height) / vSpacing))
 
+        cells = rows * columns
+        count_update = cells * 0.05
+
+        id = 1
+        count = 0
+
         for col in range(columns):
             # (column + 1) and (row + 1) calculation is used to maintain
             # topology between adjacent shapes and avoid overlaps/holes
@@ -229,5 +256,9 @@ class GridPolygon(GeoAlgorithm):
                 polyline.append(QgsPoint(x1, y2))
 
                 ft.setGeometry(QgsGeometry.fromPolygon([polyline]))
-                ft.setAttributes([x1, y1, x4, y3])
+                ft.setAttributes([x1, y1, x4, y3, id])
                 writer.addFeature(ft)
+                id += 1
+                count += 1
+                if int(math.fmod(count, count_update)) == 0:
+                    progress.setPercentage(int(count / cells * 100))

python/plugins/processing/algs/qgis/VectorGridLines.py

@@ -50,6 +50,11 @@ class VectorGridLines(GeoAlgorithm):
     STEP_Y = 'STEP_Y'
     OUTPUT = 'OUTPUT'
 
+    def __init__(self):
+        GeoAlgorithm.__init__(self)
+        # this algorithm is deprecated - use GridLine instead
+        self.showInToolbox = False
+
     def getIcon(self):
         return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'vector_grid.png'))
 
@@ -58,7 +63,7 @@ class VectorGridLines(GeoAlgorithm):
         self.group, self.i18n_group = self.trAlgorithm('Vector creation tools')
 
         self.addParameter(ParameterExtent(self.EXTENT,
-                                          self.tr('Grid extent')))
+                                          self.tr('Grid extent'), optional=False))
         self.addParameter(ParameterNumber(self.STEP_X,
                                           self.tr('X spacing'), 0.0, 1000000000.0, 0.0001))
         self.addParameter(ParameterNumber(self.STEP_Y,

python/plugins/processing/algs/qgis/VectorGridPolygons.py

@@ -50,6 +50,11 @@ class VectorGridPolygons(GeoAlgorithm):
     STEP_Y = 'STEP_Y'
     OUTPUT = 'OUTPUT'
 
+    def __init__(self):
+        GeoAlgorithm.__init__(self)
+        # this algorithm is deprecated - use GridPolygon instead
+        self.showInToolbox = False
+
     def getIcon(self):
         return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'vector_grid.png'))
 

python/plugins/processing/tests/testdata/expected/grid_diamond.gfs

@@ -0,0 +1,41 @@
+<GMLFeatureClassList>
+  <GMLFeatureClass>
+    <Name>grid_diamond</Name>
+    <ElementPath>grid_diamond</ElementPath>
+    <!--POLYGON-->
+    <GeometryType>3</GeometryType>
+    <SRSName>EPSG:4326</SRSName>
+    <DatasetSpecificInfo>
+      <FeatureCount>20</FeatureCount>
+      <ExtentXMin>-1.00000</ExtentXMin>
+      <ExtentXMax>14.00000</ExtentXMax>
+      <ExtentYMin>-7.00000</ExtentYMin>
+      <ExtentYMax>6.50000</ExtentYMax>
+    </DatasetSpecificInfo>
+    <PropertyDefn>
+      <Name>left</Name>
+      <ElementPath>left</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>top</Name>
+      <ElementPath>top</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>right</Name>
+      <ElementPath>right</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>bottom</Name>
+      <ElementPath>bottom</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>id</Name>
+      <ElementPath>id</ElementPath>
+      <Type>Integer</Type>
+    </PropertyDefn>
+  </GMLFeatureClass>
+</GMLFeatureClassList>

python/plugins/processing/tests/testdata/expected/grid_diamond.gml

@@ -0,0 +1,214 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ogr:FeatureCollection
+     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+     xsi:schemaLocation=""
+     xmlns:ogr="http://ogr.maptools.org/"
+     xmlns:gml="http://www.opengis.net/gml">
+  <gml:boundedBy>
+    <gml:Box>
+      <gml:coord><gml:X>-1</gml:X><gml:Y>-7</gml:Y></gml:coord>
+      <gml:coord><gml:X>14</gml:X><gml:Y>6.5</gml:Y></gml:coord>
+    </gml:Box>
+  </gml:boundedBy>
+                                                                                                                                                           
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.0">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1,5 1.5,6.5 4,5 1.5,3.5 -1,5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>6.5000000000000000</ogr:top>
+      <ogr:right>4.0000000000000000</ogr:right>
+      <ogr:bottom>3.5000000000000000</ogr:bottom>
+      <ogr:id>1</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.1">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1,2 1.5,3.5 4,2 1.5,0.5 -1,2</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>3.5000000000000000</ogr:top>
+      <ogr:right>4.0000000000000000</ogr:right>
+      <ogr:bottom>0.5000000000000000</ogr:bottom>
+      <ogr:id>2</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.2">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1,-1 1.5,0.5 4,-1 1.5,-2.5 -1,-1</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>0.5000000000000000</ogr:top>
+      <ogr:right>4.0000000000000000</ogr:right>
+      <ogr:bottom>-2.5000000000000000</ogr:bottom>
+      <ogr:id>3</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.3">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1,-4 1.5,-2.5 4,-4 1.5,-5.5 -1,-4</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>-2.5000000000000000</ogr:top>
+      <ogr:right>4.0000000000000000</ogr:right>
+      <ogr:bottom>-5.5000000000000000</ogr:bottom>
+      <ogr:id>4</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.4">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>1.5,3.5 4,5 6.5,3.5 4,2 1.5,3.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>1.5000000000000000</ogr:left>
+      <ogr:top>5.0000000000000000</ogr:top>
+      <ogr:right>6.5000000000000000</ogr:right>
+      <ogr:bottom>2.0000000000000000</ogr:bottom>
+      <ogr:id>5</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.5">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>1.5,0.5 4,2 6.5,0.5 4,-1 1.5,0.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>1.5000000000000000</ogr:left>
+      <ogr:top>2.0000000000000000</ogr:top>
+      <ogr:right>6.5000000000000000</ogr:right>
+      <ogr:bottom>-1.0000000000000000</ogr:bottom>
+      <ogr:id>6</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.6">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>1.5,-2.5 4,-1 6.5,-2.5 4,-4 1.5,-2.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>1.5000000000000000</ogr:left>
+      <ogr:top>-1.0000000000000000</ogr:top>
+      <ogr:right>6.5000000000000000</ogr:right>
+      <ogr:bottom>-4.0000000000000000</ogr:bottom>
+      <ogr:id>7</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.7">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>1.5,-5.5 4,-4 6.5,-5.5 4,-7 1.5,-5.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>1.5000000000000000</ogr:left>
+      <ogr:top>-4.0000000000000000</ogr:top>
+      <ogr:right>6.5000000000000000</ogr:right>
+      <ogr:bottom>-7.0000000000000000</ogr:bottom>
+      <ogr:id>8</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.8">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>4,5 6.5,6.5 9,5 6.5,3.5 4,5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>4.0000000000000000</ogr:left>
+      <ogr:top>6.5000000000000000</ogr:top>
+      <ogr:right>9.0000000000000000</ogr:right>
+      <ogr:bottom>3.5000000000000000</ogr:bottom>
+      <ogr:id>9</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.9">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>4,2 6.5,3.5 9,2 6.5,0.5 4,2</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>4.0000000000000000</ogr:left>
+      <ogr:top>3.5000000000000000</ogr:top>
+      <ogr:right>9.0000000000000000</ogr:right>
+      <ogr:bottom>0.5000000000000000</ogr:bottom>
+      <ogr:id>10</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.10">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>4,-1 6.5,0.5 9,-1 6.5,-2.5 4,-1</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>4.0000000000000000</ogr:left>
+      <ogr:top>0.5000000000000000</ogr:top>
+      <ogr:right>9.0000000000000000</ogr:right>
+      <ogr:bottom>-2.5000000000000000</ogr:bottom>
+      <ogr:id>11</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.11">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>4,-4 6.5,-2.5 9,-4 6.5,-5.5 4,-4</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>4.0000000000000000</ogr:left>
+      <ogr:top>-2.5000000000000000</ogr:top>
+      <ogr:right>9.0000000000000000</ogr:right>
+      <ogr:bottom>-5.5000000000000000</ogr:bottom>
+      <ogr:id>12</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.12">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>6.5,3.5 9,5 11.5,3.5 9,2 6.5,3.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>6.5000000000000000</ogr:left>
+      <ogr:top>5.0000000000000000</ogr:top>
+      <ogr:right>11.5000000000000000</ogr:right>
+      <ogr:bottom>2.0000000000000000</ogr:bottom>
+      <ogr:id>13</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.13">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>6.5,0.5 9,2 11.5,0.5 9,-1 6.5,0.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>6.5000000000000000</ogr:left>
+      <ogr:top>2.0000000000000000</ogr:top>
+      <ogr:right>11.5000000000000000</ogr:right>
+      <ogr:bottom>-1.0000000000000000</ogr:bottom>
+      <ogr:id>14</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.14">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>6.5,-2.5 9,-1 11.5,-2.5 9,-4 6.5,-2.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>6.5000000000000000</ogr:left>
+      <ogr:top>-1.0000000000000000</ogr:top>
+      <ogr:right>11.5000000000000000</ogr:right>
+      <ogr:bottom>-4.0000000000000000</ogr:bottom>
+      <ogr:id>15</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.15">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>6.5,-5.5 9,-4 11.5,-5.5 9,-7 6.5,-5.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>6.5000000000000000</ogr:left>
+      <ogr:top>-4.0000000000000000</ogr:top>
+      <ogr:right>11.5000000000000000</ogr:right>
+      <ogr:bottom>-7.0000000000000000</ogr:bottom>
+      <ogr:id>16</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.16">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>9,5 11.5,6.5 14,5 11.5,3.5 9,5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>9.0000000000000000</ogr:left>
+      <ogr:top>6.5000000000000000</ogr:top>
+      <ogr:right>14.0000000000000000</ogr:right>
+      <ogr:bottom>3.5000000000000000</ogr:bottom>
+      <ogr:id>17</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.17">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>9,2 11.5,3.5 14,2 11.5,0.5 9,2</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>9.0000000000000000</ogr:left>
+      <ogr:top>3.5000000000000000</ogr:top>
+      <ogr:right>14.0000000000000000</ogr:right>
+      <ogr:bottom>0.5000000000000000</ogr:bottom>
+      <ogr:id>18</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.18">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>9,-1 11.5,0.5 14,-1 11.5,-2.5 9,-1</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>9.0000000000000000</ogr:left>
+      <ogr:top>0.5000000000000000</ogr:top>
+      <ogr:right>14.0000000000000000</ogr:right>
+      <ogr:bottom>-2.5000000000000000</ogr:bottom>
+      <ogr:id>19</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_diamond fid="grid_diamond.19">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>9,-4 11.5,-2.5 14,-4 11.5,-5.5 9,-4</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>9.0000000000000000</ogr:left>
+      <ogr:top>-2.5000000000000000</ogr:top>
+      <ogr:right>14.0000000000000000</ogr:right>
+      <ogr:bottom>-5.5000000000000000</ogr:bottom>
+      <ogr:id>20</ogr:id>
+    </ogr:grid_diamond>
+  </gml:featureMember>
+</ogr:FeatureCollection>

python/plugins/processing/tests/testdata/expected/grid_hexagon.gfs

@@ -0,0 +1,41 @@
+<GMLFeatureClassList>
+  <GMLFeatureClass>
+    <Name>grid_hexagon</Name>
+    <ElementPath>grid_hexagon</ElementPath>
+    <!--POLYGON-->
+    <GeometryType>3</GeometryType>
+    <SRSName>EPSG:4326</SRSName>
+    <DatasetSpecificInfo>
+      <FeatureCount>9</FeatureCount>
+      <ExtentXMin>-1.00000</ExtentXMin>
+      <ExtentXMax>13.43376</ExtentXMax>
+      <ExtentYMin>-11.00000</ExtentYMin>
+      <ExtentYMax>6.50000</ExtentYMax>
+    </DatasetSpecificInfo>
+    <PropertyDefn>
+      <Name>left</Name>
+      <ElementPath>left</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>top</Name>
+      <ElementPath>top</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>right</Name>
+      <ElementPath>right</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>bottom</Name>
+      <ElementPath>bottom</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>id</Name>
+      <ElementPath>id</ElementPath>
+      <Type>Integer</Type>
+    </PropertyDefn>
+  </GMLFeatureClass>
+</GMLFeatureClassList>

python/plugins/processing/tests/testdata/expected/grid_hexagon.gml

@@ -0,0 +1,104 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ogr:FeatureCollection
+     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+     xsi:schemaLocation=""
+     xmlns:ogr="http://ogr.maptools.org/"
+     xmlns:gml="http://www.opengis.net/gml">
+  <gml:boundedBy>
+    <gml:Box>
+      <gml:coord><gml:X>-1</gml:X><gml:Y>-11</gml:Y></gml:coord>
+      <gml:coord><gml:X>13.43375672974065</gml:X><gml:Y>6.5</gml:Y></gml:coord>
+    </gml:Box>
+  </gml:boundedBy>
+                                                                                                                                           
+  <gml:featureMember>
+    <ogr:grid_hexagon fid="grid_hexagon.0">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1,4 0.443375672974065,6.5 3.33012701892219,6.5 4.77350269189626,4.0 3.33012701892219,1.5 0.443375672974065,1.5 -1,4</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>6.5000000000000000</ogr:top>
+      <ogr:right>4.7735026918962600</ogr:right>
+      <ogr:bottom>1.5000000000000000</ogr:bottom>
+      <ogr:id>1</ogr:id>
+    </ogr:grid_hexagon>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_hexagon fid="grid_hexagon.1">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1,-1 0.443375672974065,1.5 3.33012701892219,1.5 4.77350269189626,-1.0 3.33012701892219,-3.5 0.443375672974065,-3.5 -1,-1</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>1.5000000000000000</ogr:top>
+      <ogr:right>4.7735026918962600</ogr:right>
+      <ogr:bottom>-3.5000000000000000</ogr:bottom>
+      <ogr:id>2</ogr:id>
+    </ogr:grid_hexagon>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_hexagon fid="grid_hexagon.2">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1,-6 0.443375672974065,-3.5 3.33012701892219,-3.5 4.77350269189626,-6.0 3.33012701892219,-8.5 0.443375672974065,-8.5 -1,-6</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>-3.5000000000000000</ogr:top>
+      <ogr:right>4.7735026918962600</ogr:right>
+      <ogr:bottom>-8.5000000000000000</ogr:bottom>
+      <ogr:id>3</ogr:id>
+    </ogr:grid_hexagon>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_hexagon fid="grid_hexagon.3">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>3.33012701892219,1.5 4.77350269189626,4.0 7.66025403784439,4.0 9.10362971081845,1.5 7.66025403784439,-1.0 4.77350269189626,-1.0 3.33012701892219,1.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>3.3301270189221945</ogr:left>
+      <ogr:top>4.0000000000000000</ogr:top>
+      <ogr:right>9.1036297108184545</ogr:right>
+      <ogr:bottom>-1.0000000000000000</ogr:bottom>
+      <ogr:id>4</ogr:id>
+    </ogr:grid_hexagon>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_hexagon fid="grid_hexagon.4">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>3.33012701892219,-3.5 4.77350269189626,-1.0 7.66025403784439,-1.0 9.10362971081845,-3.5 7.66025403784439,-6.0 4.77350269189626,-6.0 3.33012701892219,-3.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>3.3301270189221945</ogr:left>
+      <ogr:top>-1.0000000000000000</ogr:top>
+      <ogr:right>9.1036297108184545</ogr:right>
+      <ogr:bottom>-6.0000000000000000</ogr:bottom>
+      <ogr:id>5</ogr:id>
+    </ogr:grid_hexagon>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_hexagon fid="grid_hexagon.5">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>3.33012701892219,-8.5 4.77350269189626,-6.0 7.66025403784439,-6.0 9.10362971081845,-8.5 7.66025403784439,-11.0 4.77350269189626,-11.0 3.33012701892219,-8.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>3.3301270189221945</ogr:left>
+      <ogr:top>-6.0000000000000000</ogr:top>
+      <ogr:right>9.1036297108184545</ogr:right>
+      <ogr:bottom>-11.0000000000000000</ogr:bottom>
+      <ogr:id>6</ogr:id>
+    </ogr:grid_hexagon>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_hexagon fid="grid_hexagon.6">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>7.66025403784439,4.0 9.10362971081845,6.5 11.9903810567666,6.5 13.4337567297406,4.0 11.9903810567666,1.5 9.10362971081845,1.5 7.66025403784439,4.0</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>7.6602540378443891</ogr:left>
+      <ogr:top>6.5000000000000000</ogr:top>
+      <ogr:right>13.4337567297406490</ogr:right>
+      <ogr:bottom>1.5000000000000000</ogr:bottom>
+      <ogr:id>7</ogr:id>
+    </ogr:grid_hexagon>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_hexagon fid="grid_hexagon.7">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>7.66025403784439,-1.0 9.10362971081845,1.5 11.9903810567666,1.5 13.4337567297406,-1.0 11.9903810567666,-3.5 9.10362971081845,-3.5 7.66025403784439,-1.0</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>7.6602540378443891</ogr:left>
+      <ogr:top>1.5000000000000000</ogr:top>
+      <ogr:right>13.4337567297406490</ogr:right>
+      <ogr:bottom>-3.5000000000000000</ogr:bottom>
+      <ogr:id>8</ogr:id>
+    </ogr:grid_hexagon>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_hexagon fid="grid_hexagon.8">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>7.66025403784439,-6.0 9.10362971081845,-3.5 11.9903810567666,-3.5 13.4337567297406,-6.0 11.9903810567666,-8.5 9.10362971081845,-8.5 7.66025403784439,-6.0</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>7.6602540378443891</ogr:left>
+      <ogr:top>-3.5000000000000000</ogr:top>
+      <ogr:right>13.4337567297406490</ogr:right>
+      <ogr:bottom>-8.5000000000000000</ogr:bottom>
+      <ogr:id>9</ogr:id>
+    </ogr:grid_hexagon>
+  </gml:featureMember>
+</ogr:FeatureCollection>

python/plugins/processing/tests/testdata/expected/grid_lines.gfs

@@ -0,0 +1,46 @@
+<GMLFeatureClassList>
+  <GMLFeatureClass>
+    <Name>grid_lines</Name>
+    <ElementPath>grid_lines</ElementPath>
+    <!--LINESTRING-->
+    <GeometryType>2</GeometryType>
+    <SRSName>EPSG:4326</SRSName>
+    <DatasetSpecificInfo>
+      <FeatureCount>7</FeatureCount>
+      <ExtentXMin>-1.00000</ExtentXMin>
+      <ExtentXMax>11.20000</ExtentXMax>
+      <ExtentYMin>-4.00000</ExtentYMin>
+      <ExtentYMax>6.50000</ExtentYMax>
+    </DatasetSpecificInfo>
+    <PropertyDefn>
+      <Name>left</Name>
+      <ElementPath>left</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>top</Name>
+      <ElementPath>top</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>right</Name>
+      <ElementPath>right</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>bottom</Name>
+      <ElementPath>bottom</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>id</Name>
+      <ElementPath>id</ElementPath>
+      <Type>Integer</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>coord</Name>
+      <ElementPath>coord</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+  </GMLFeatureClass>
+</GMLFeatureClassList>

python/plugins/processing/tests/testdata/expected/grid_lines.gml

@@ -0,0 +1,91 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ogr:FeatureCollection
+     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+     xsi:schemaLocation=""
+     xmlns:ogr="http://ogr.maptools.org/"
+     xmlns:gml="http://www.opengis.net/gml">
+  <gml:boundedBy>
+    <gml:Box>
+      <gml:coord><gml:X>-1</gml:X><gml:Y>-4</gml:Y></gml:coord>
+      <gml:coord><gml:X>11.2</gml:X><gml:Y>6.5</gml:Y></gml:coord>
+    </gml:Box>
+  </gml:boundedBy>
+                                                                                                                                                         
+  <gml:featureMember>
+    <ogr:grid_lines fid="grid_lines.0">
+      <ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>-1.0,6.5 11.2,6.5</gml:coordinates></gml:LineString></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>6.5000000000000000</ogr:top>
+      <ogr:right>11.1999999999999993</ogr:right>
+      <ogr:bottom>6.5000000000000000</ogr:bottom>
+      <ogr:id>1</ogr:id>
+      <ogr:coord>6.500000000000000</ogr:coord>
+    </ogr:grid_lines>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_lines fid="grid_lines.1">
+      <ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>-1.0,3.5 11.2,3.5</gml:coordinates></gml:LineString></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>3.5000000000000000</ogr:top>
+      <ogr:right>11.1999999999999993</ogr:right>
+      <ogr:bottom>3.5000000000000000</ogr:bottom>
+      <ogr:id>2</ogr:id>
+      <ogr:coord>3.500000000000000</ogr:coord>
+    </ogr:grid_lines>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_lines fid="grid_lines.2">
+      <ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>-1.0,0.5 11.2,0.5</gml:coordinates></gml:LineString></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>0.5000000000000000</ogr:top>
+      <ogr:right>11.1999999999999993</ogr:right>
+      <ogr:bottom>0.5000000000000000</ogr:bottom>
+      <ogr:id>3</ogr:id>
+      <ogr:coord>0.500000000000000</ogr:coord>
+    </ogr:grid_lines>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_lines fid="grid_lines.3">
+      <ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>-1.0,-2.5 11.2,-2.5</gml:coordinates></gml:LineString></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>-2.5000000000000000</ogr:top>
+      <ogr:right>11.1999999999999993</ogr:right>
+      <ogr:bottom>-2.5000000000000000</ogr:bottom>
+      <ogr:id>4</ogr:id>
+      <ogr:coord>-2.500000000000000</ogr:coord>
+    </ogr:grid_lines>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_lines fid="grid_lines.4">
+      <ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>-1.0,6.5 -1,-4</gml:coordinates></gml:LineString></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>6.5000000000000000</ogr:top>
+      <ogr:right>-1.0000000000000000</ogr:right>
+      <ogr:bottom>-4.0000000000000000</ogr:bottom>
+      <ogr:id>5</ogr:id>
+      <ogr:coord>-1.000000000000000</ogr:coord>
+    </ogr:grid_lines>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_lines fid="grid_lines.5">
+      <ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>4.0,6.5 4,-4</gml:coordinates></gml:LineString></ogr:geometryProperty>
+      <ogr:left>4.0000000000000000</ogr:left>
+      <ogr:top>6.5000000000000000</ogr:top>
+      <ogr:right>4.0000000000000000</ogr:right>
+      <ogr:bottom>-4.0000000000000000</ogr:bottom>
+      <ogr:id>6</ogr:id>
+      <ogr:coord>4.000000000000000</ogr:coord>
+    </ogr:grid_lines>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_lines fid="grid_lines.6">
+      <ogr:geometryProperty><gml:LineString srsName="EPSG:4326"><gml:coordinates>9.0,6.5 9,-4</gml:coordinates></gml:LineString></ogr:geometryProperty>
+      <ogr:left>9.0000000000000000</ogr:left>
+      <ogr:top>6.5000000000000000</ogr:top>
+      <ogr:right>9.0000000000000000</ogr:right>
+      <ogr:bottom>-4.0000000000000000</ogr:bottom>
+      <ogr:id>7</ogr:id>
+      <ogr:coord>9.000000000000000</ogr:coord>
+    </ogr:grid_lines>
+  </gml:featureMember>
+</ogr:FeatureCollection>

python/plugins/processing/tests/testdata/expected/grid_rectangles.gfs

@@ -0,0 +1,41 @@
+<GMLFeatureClassList>
+  <GMLFeatureClass>
+    <Name>grid_rectangles</Name>
+    <ElementPath>grid_rectangles</ElementPath>
+    <!--POLYGON-->
+    <GeometryType>3</GeometryType>
+    <SRSName>EPSG:4326</SRSName>
+    <DatasetSpecificInfo>
+      <FeatureCount>12</FeatureCount>
+      <ExtentXMin>-1.00000</ExtentXMin>
+      <ExtentXMax>14.00000</ExtentXMax>
+      <ExtentYMin>-5.50000</ExtentYMin>
+      <ExtentYMax>6.50000</ExtentYMax>
+    </DatasetSpecificInfo>
+    <PropertyDefn>
+      <Name>left</Name>
+      <ElementPath>left</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>top</Name>
+      <ElementPath>top</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>right</Name>
+      <ElementPath>right</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>bottom</Name>
+      <ElementPath>bottom</ElementPath>
+      <Type>Real</Type>
+    </PropertyDefn>
+    <PropertyDefn>
+      <Name>id</Name>
+      <ElementPath>id</ElementPath>
+      <Type>Integer</Type>
+    </PropertyDefn>
+  </GMLFeatureClass>
+</GMLFeatureClassList>

python/plugins/processing/tests/testdata/expected/grid_rectangles.gml

@@ -0,0 +1,134 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ogr:FeatureCollection
+     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+     xsi:schemaLocation=""
+     xmlns:ogr="http://ogr.maptools.org/"
+     xmlns:gml="http://www.opengis.net/gml">
+  <gml:boundedBy>
+    <gml:Box>
+      <gml:coord><gml:X>-1</gml:X><gml:Y>-5.5</gml:Y></gml:coord>
+      <gml:coord><gml:X>14</gml:X><gml:Y>6.5</gml:Y></gml:coord>
+    </gml:Box>
+  </gml:boundedBy>
+                                                                                                                                                         
+  <gml:featureMember>
+    <ogr:grid_rectangles fid="grid_rectangles.0">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1.0,6.5 4.0,6.5 4.0,3.5 -1.0,3.5 -1.0,6.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>6.5000000000000000</ogr:top>
+      <ogr:right>4.0000000000000000</ogr:right>
+      <ogr:bottom>3.5000000000000000</ogr:bottom>
+      <ogr:id>1</ogr:id>
+    </ogr:grid_rectangles>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_rectangles fid="grid_rectangles.1">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1.0,3.5 4.0,3.5 4.0,0.5 -1.0,0.5 -1.0,3.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>3.5000000000000000</ogr:top>
+      <ogr:right>4.0000000000000000</ogr:right>
+      <ogr:bottom>0.5000000000000000</ogr:bottom>
+      <ogr:id>2</ogr:id>
+    </ogr:grid_rectangles>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_rectangles fid="grid_rectangles.2">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1.0,0.5 4.0,0.5 4.0,-2.5 -1.0,-2.5 -1.0,0.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>0.5000000000000000</ogr:top>
+      <ogr:right>4.0000000000000000</ogr:right>
+      <ogr:bottom>-2.5000000000000000</ogr:bottom>
+      <ogr:id>3</ogr:id>
+    </ogr:grid_rectangles>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_rectangles fid="grid_rectangles.3">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>-1.0,-2.5 4.0,-2.5 4.0,-5.5 -1.0,-5.5 -1.0,-2.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>-1.0000000000000000</ogr:left>
+      <ogr:top>-2.5000000000000000</ogr:top>
+      <ogr:right>4.0000000000000000</ogr:right>
+      <ogr:bottom>-5.5000000000000000</ogr:bottom>
+      <ogr:id>4</ogr:id>
+    </ogr:grid_rectangles>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_rectangles fid="grid_rectangles.4">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>4.0,6.5 9.0,6.5 9.0,3.5 4.0,3.5 4.0,6.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>4.0000000000000000</ogr:left>
+      <ogr:top>6.5000000000000000</ogr:top>
+      <ogr:right>9.0000000000000000</ogr:right>
+      <ogr:bottom>3.5000000000000000</ogr:bottom>
+      <ogr:id>5</ogr:id>
+    </ogr:grid_rectangles>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_rectangles fid="grid_rectangles.5">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>4.0,3.5 9.0,3.5 9.0,0.5 4.0,0.5 4.0,3.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>4.0000000000000000</ogr:left>
+      <ogr:top>3.5000000000000000</ogr:top>
+      <ogr:right>9.0000000000000000</ogr:right>
+      <ogr:bottom>0.5000000000000000</ogr:bottom>
+      <ogr:id>6</ogr:id>
+    </ogr:grid_rectangles>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_rectangles fid="grid_rectangles.6">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>4.0,0.5 9.0,0.5 9.0,-2.5 4.0,-2.5 4.0,0.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>4.0000000000000000</ogr:left>
+      <ogr:top>0.5000000000000000</ogr:top>
+      <ogr:right>9.0000000000000000</ogr:right>
+      <ogr:bottom>-2.5000000000000000</ogr:bottom>
+      <ogr:id>7</ogr:id>
+    </ogr:grid_rectangles>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_rectangles fid="grid_rectangles.7">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>4.0,-2.5 9.0,-2.5 9.0,-5.5 4.0,-5.5 4.0,-2.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>4.0000000000000000</ogr:left>
+      <ogr:top>-2.5000000000000000</ogr:top>
+      <ogr:right>9.0000000000000000</ogr:right>
+      <ogr:bottom>-5.5000000000000000</ogr:bottom>
+      <ogr:id>8</ogr:id>
+    </ogr:grid_rectangles>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_rectangles fid="grid_rectangles.8">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>9.0,6.5 14.0,6.5 14.0,3.5 9.0,3.5 9.0,6.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>9.0000000000000000</ogr:left>
+      <ogr:top>6.5000000000000000</ogr:top>
+      <ogr:right>14.0000000000000000</ogr:right>
+      <ogr:bottom>3.5000000000000000</ogr:bottom>
+      <ogr:id>9</ogr:id>
+    </ogr:grid_rectangles>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_rectangles fid="grid_rectangles.9">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>9.0,3.5 14.0,3.5 14.0,0.5 9.0,0.5 9.0,3.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>9.0000000000000000</ogr:left>
+      <ogr:top>3.5000000000000000</ogr:top>
+      <ogr:right>14.0000000000000000</ogr:right>
+      <ogr:bottom>0.5000000000000000</ogr:bottom>
+      <ogr:id>10</ogr:id>
+    </ogr:grid_rectangles>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_rectangles fid="grid_rectangles.10">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>9.0,0.5 14.0,0.5 14.0,-2.5 9.0,-2.5 9.0,0.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>9.0000000000000000</ogr:left>
+      <ogr:top>0.5000000000000000</ogr:top>
+      <ogr:right>14.0000000000000000</ogr:right>
+      <ogr:bottom>-2.5000000000000000</ogr:bottom>
+      <ogr:id>11</ogr:id>
+    </ogr:grid_rectangles>
+  </gml:featureMember>
+  <gml:featureMember>
+    <ogr:grid_rectangles fid="grid_rectangles.11">
+      <ogr:geometryProperty><gml:Polygon srsName="EPSG:4326"><gml:outerBoundaryIs><gml:LinearRing><gml:coordinates>9.0,-2.5 14.0,-2.5 14.0,-5.5 9.0,-5.5 9.0,-2.5</gml:coordinates></gml:LinearRing></gml:outerBoundaryIs></gml:Polygon></ogr:geometryProperty>
+      <ogr:left>9.0000000000000000</ogr:left>
+      <ogr:top>-2.5000000000000000</ogr:top>
+      <ogr:right>14.0000000000000000</ogr:right>
+      <ogr:bottom>-5.5000000000000000</ogr:bottom>
+      <ogr:id>12</ogr:id>
+    </ogr:grid_rectangles>
+  </gml:featureMember>
+</ogr:FeatureCollection>

python/plugins/processing/tests/testdata/qgis_algorithm_tests.yaml

@@ -1666,3 +1666,66 @@ tests:
       OUTPUT_TABLE:
         name: expected/dropped_geometry.csv
         type: vector
+
+  - algorithm: qgis:creategridlines
+    name: Create grid (lines)
+    params:
+      CRS: EPSG:4326
+      EXTENT: -1,11.2,-4,6.5
+      HSPACING: 5.0
+      VSPACING: 3.0
+    results:
+      OUTPUT:
+        name: expected/grid_lines.gml
+        type: vector
+        compare:
+          geometry:
+            precision: 7
+
+  - algorithm: qgis:creategridpolygon
+    name: Create grid (rectangles)
+    params:
+      CRS: EPSG:4326
+      EXTENT: -1,11.2,-4,6.5
+      HSPACING: 5.0
+      TYPE: '0'
+      VSPACING: 3.0
+    results:
+      OUTPUT:
+        name: expected/grid_rectangles.gml
+        type: vector
+        compare:
+          geometry:
+            precision: 7
+
+  - algorithm: qgis:creategridpolygon
+    name: Create grid (diamond)
+    params:
+      CRS: EPSG:4326
+      EXTENT: -1,11.2,-4,6.5
+      HSPACING: 5.0
+      TYPE: '1'
+      VSPACING: 3.0
+    results:
+      OUTPUT:
+        name: expected/grid_diamond.gml
+        type: vector
+        compare:
+          geometry:
+            precision: 7
+
+  - algorithm: qgis:creategridpolygon
+    name: Create grid (hexagon)
+    params:
+      CRS: EPSG:4326
+      EXTENT: -1,11.2,-4,6.5
+      HSPACING: 5.0
+      TYPE: '2'
+      VSPACING: 5.0
+    results:
+      OUTPUT:
+        name: expected/grid_hexagon.gml
+        type: vector
+        compare:
+          geometry:
+            precision: 7