# -*- coding: utf-8 -*-
"""
***************************************************************************
ExtentSelectionPanel.py
---------------------
Date : August 2012
Copyright : (C) 2012 by Victor Olaya
Email : volayaf at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
import os
from PyQt4 import uic
from PyQt4.QtGui import QMenu, QAction, QCursor, QInputDialog
from qgis.gui import QgsMessageBar
from qgis.core import QgsRasterLayer, QgsVectorLayer
from qgis.utils import iface
from processing.gui.RectangleMapTool import RectangleMapTool
from processing.core.parameters import ParameterRaster
from processing.core.parameters import ParameterVector
from processing.core.parameters import ParameterMultipleInput
from processing.core.ProcessingConfig import ProcessingConfig
from processing.tools import dataobjects
pluginPath = os.path.split(os.path.dirname(__file__))[0]
WIDGET, BASE = uic.loadUiType(
os.path.join(pluginPath, 'ui', 'widgetBaseSelector.ui'))
class ExtentSelectionPanel(BASE, WIDGET):
def __init__(self, dialog, alg, default=None):
super(ExtentSelectionPanel, self).__init__(None)
self.setupUi(self)
self.dialog = dialog
self.params = alg.parameters
if self.canUseAutoExtent():
if hasattr(self.leText, 'setPlaceholderText'):
self.leText.setPlaceholderText(
self.tr('[Leave blank to use min covering extent]'))
self.btnSelect.clicked.connect(self.selectExtent)
canvas = iface.mapCanvas()
self.prevMapTool = canvas.mapTool()
self.tool = RectangleMapTool(canvas)
self.tool.rectangleCreated.connect(self.updateExtent)
if default:
tokens = unicode(default).split(',')
if len(tokens) == 4:
try:
float(tokens[0])
float(tokens[1])
float(tokens[2])
float(tokens[3])
self.leText.setText(unicode(default))
except:
pass
def canUseAutoExtent(self):
for param in self.params:
if isinstance(param, (ParameterRaster, ParameterVector)):
return True
if isinstance(param, ParameterMultipleInput):
return True
return False
def selectExtent(self):
popupmenu = QMenu()
useLayerExtentAction = QAction(
self.tr('Use layer/canvas extent'), self.btnSelect)
selectOnCanvasAction = QAction(
self.tr('Select extent on canvas'), self.btnSelect)
popupmenu.addAction(useLayerExtentAction)
popupmenu.addAction(selectOnCanvasAction)
selectOnCanvasAction.triggered.connect(self.selectOnCanvas)
useLayerExtentAction.triggered.connect(self.useLayerExtent)
if self.canUseAutoExtent():
useMincoveringExtentAction = QAction(
self.tr('Use min covering extent from input layers'),
self.btnSelect)
useMincoveringExtentAction.triggered.connect(
self.useMinCoveringExtent)
popupmenu.addAction(useMincoveringExtentAction)
popupmenu.exec_(QCursor.pos())
def useMinCoveringExtent(self):
self.leText.setText('')
def getMinCoveringExtent(self):
first = True
found = False
for param in self.params:
if param.value:
if isinstance(param, (ParameterRaster, ParameterVector)):
if isinstance(param.value, (QgsRasterLayer,
QgsVectorLayer)):
layer = param.value
else:
layer = dataobjects.getObject(param.value)
if layer:
found = True
self.addToRegion(layer, first)
first = False
elif isinstance(param, ParameterMultipleInput):
layers = param.value.split(';')
for layername in layers:
layer = dataobjects.getObject(layername)
if layer:
found = True
self.addToRegion(layer, first)
first = False
if found:
return '{},{},{},{}'.format(
self.xmin, self.xmax, self.ymin, self.ymax)
else:
return None
def useNewAlg(self, alg):
self.params = alg.parameters
def addToRegion(self, layer, first):
if first:
self.xmin = layer.extent().xMinimum()
self.xmax = layer.extent().xMaximum()
self.ymin = layer.extent().yMinimum()
self.ymax = layer.extent().yMaximum()
else:
self.xmin = min(self.xmin, layer.extent().xMinimum())
self.xmax = max(self.xmax, layer.extent().xMaximum())
self.ymin = min(self.ymin, layer.extent().yMinimum())
self.ymax = max(self.ymax, layer.extent().yMaximum())
def useLayerExtent(self):
CANVAS_KEY = 'Use canvas extent'
extentsDict = {}
extentsDict[CANVAS_KEY] = {"extent": iface.mapCanvas().extent(),
"authid": iface.mapCanvas().mapSettings().destinationCrs().authid()}
extents = [CANVAS_KEY]
layers = dataobjects.getAllLayers()
for layer in layers:
authid = layer.crs().authid()
if ProcessingConfig.getSetting(ProcessingConfig.SHOW_CRS_DEF) \
and authid is not None:
layerName = u'{} [{}]'.format(layer.name(), authid)
else:
layerName = layer.name()
extents.append(layerName)
extentsDict[layerName] = {"extent": layer.extent(), "authid": authid}
(item, ok) = QInputDialog.getItem(self, self.tr('Select extent'),
self.tr('Use extent from'), extents, False)
if ok:
self.setValueFromRect(extentsDict[item]["extent"])
if extentsDict[item]["authid"] != iface.mapCanvas().mapSettings().destinationCrs().authid():
iface.messageBar().pushMessage(self.tr("Warning"),
self.tr("The projection of the chosen layer is not the same as canvas projection! The selected extent might not be what was intended."),
QgsMessageBar.WARNING, 8)
def selectOnCanvas(self):
canvas = iface.mapCanvas()
canvas.setMapTool(self.tool)
self.dialog.showMinimized()
def updateExtent(self):
r = self.tool.rectangle()
self.setValueFromRect(r)
def setValueFromRect(self, r):
s = '{},{},{},{}'.format(
r.xMinimum(), r.xMaximum(), r.yMinimum(), r.yMaximum())
self.leText.setText(s)
self.tool.reset()
canvas = iface.mapCanvas()
canvas.setMapTool(self.prevMapTool)
self.dialog.showNormal()
self.dialog.raise_()
self.dialog.activateWindow()
def getValue(self):
if unicode(self.leText.text()).strip() != '':
return unicode(self.leText.text())
else:
return self.getMinCoveringExtent()
def setExtentFromString(self, s):
self.leText.setText(s)