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114 lines
3.8 KiB
Python
114 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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RectangleMapTool.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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from qgis.PyQt.QtCore import pyqtSignal
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from qgis.PyQt.QtGui import QColor
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from qgis.core import QGis, QgsPoint, QgsRectangle
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from qgis.gui import QgsMapTool, QgsMapToolEmitPoint, QgsRubberBand
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class RectangleMapTool(QgsMapToolEmitPoint):
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rectangleCreated = pyqtSignal()
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deactivated = pyqtSignal()
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def __init__(self, canvas):
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self.canvas = canvas
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QgsMapToolEmitPoint.__init__(self, self.canvas)
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self.rubberBand = QgsRubberBand(self.canvas, QGis.Polygon)
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self.rubberBand.setColor(QColor(255, 0, 0, 100))
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self.rubberBand.setWidth(2)
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self.reset()
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def reset(self):
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self.startPoint = self.endPoint = None
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self.isEmittingPoint = False
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self.rubberBand.reset(QGis.Polygon)
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def canvasPressEvent(self, e):
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self.startPoint = self.toMapCoordinates(e.pos())
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self.endPoint = self.startPoint
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self.isEmittingPoint = True
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self.showRect(self.startPoint, self.endPoint)
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def canvasReleaseEvent(self, e):
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self.isEmittingPoint = False
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if self.rectangle() is not None:
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self.rectangleCreated.emit()
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def canvasMoveEvent(self, e):
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if not self.isEmittingPoint:
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return
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self.endPoint = self.toMapCoordinates(e.pos())
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self.showRect(self.startPoint, self.endPoint)
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def showRect(self, startPoint, endPoint):
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self.rubberBand.reset(QGis.Polygon)
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if startPoint.x() == endPoint.x() or startPoint.y() == endPoint.y():
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return
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point1 = QgsPoint(startPoint.x(), startPoint.y())
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point2 = QgsPoint(startPoint.x(), endPoint.y())
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point3 = QgsPoint(endPoint.x(), endPoint.y())
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point4 = QgsPoint(endPoint.x(), startPoint.y())
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self.rubberBand.addPoint(point1, False)
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self.rubberBand.addPoint(point2, False)
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self.rubberBand.addPoint(point3, False)
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# True to update canvas
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self.rubberBand.addPoint(point4, True)
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self.rubberBand.show()
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def rectangle(self):
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if self.startPoint is None or self.endPoint is None:
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return None
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elif self.startPoint.x() == self.endPoint.x() or \
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self.startPoint.y() == self.endPoint.y():
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return None
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return QgsRectangle(self.startPoint, self.endPoint)
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def setRectangle(self, rect):
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if rect == self.rectangle():
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return False
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if rect is None:
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self.reset()
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else:
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self.startPoint = QgsPoint(rect.xMaximum(), rect.yMaximum())
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self.endPoint = QgsPoint(rect.xMinimum(), rect.yMinimum())
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self.showRect(self.startPoint, self.endPoint)
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return True
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def deactivate(self):
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QgsMapTool.deactivate(self)
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self.deactivated.emit()
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