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# -*- coding: utf-8 -*-
"""
***************************************************************************
extentSelector.py
---------------------
Date : December 2010
Copyright : (C) 2010 by Giuseppe Sucameli
Email : brush dot tyler 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__ = 'Giuseppe Sucameli'
__date__ = 'December 2010'
__copyright__ = '(C) 2010, Giuseppe Sucameli'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *
from qgis.gui import *
from ui_extentSelector import Ui_GdalToolsExtentSelector as Ui_ExtentSelector
import GdalTools_utils as Utils
class GdalToolsExtentSelector(QWidget, Ui_ExtentSelector):
def __init__(self, parent=None):
QWidget.__init__(self, parent)
self.canvas = None
self.tool = None
self.previousMapTool = None
self.isStarted = False
self.setupUi(self)
self.connect(self.x1CoordEdit, SIGNAL("textChanged(const QString &)"), self.coordsChanged)
self.connect(self.x2CoordEdit, SIGNAL("textChanged(const QString &)"), self.coordsChanged)
self.connect(self.y1CoordEdit, SIGNAL("textChanged(const QString &)"), self.coordsChanged)
self.connect(self.y2CoordEdit, SIGNAL("textChanged(const QString &)"), self.coordsChanged)
self.connect(self.btnEnable, SIGNAL("clicked()"), self.start)
def setCanvas(self, canvas):
self.canvas = canvas
self.tool = RectangleMapTool(self.canvas)
self.previousMapTool = self.canvas.mapTool()
self.connect(self.tool, SIGNAL("rectangleCreated()"), self.fillCoords)
self.connect(self.tool, SIGNAL("deactivated()"), self.pause)
def stop(self):
if not self.isStarted:
return
self.isStarted = False
self.btnEnable.setVisible(False)
self.tool.reset()
self.canvas.unsetMapTool(self.tool)
if self.previousMapTool != self.tool:
self.canvas.setMapTool(self.previousMapTool)
#self.coordsChanged()
self.emit( SIGNAL( "selectionStopped()" ) )
def start(self):
prevMapTool = self.canvas.mapTool()
if prevMapTool != self.tool:
self.previousMapTool = prevMapTool
self.canvas.setMapTool(self.tool)
self.isStarted = True
self.btnEnable.setVisible(False)
self.coordsChanged()
self.emit( SIGNAL( "selectionStarted()" ) )
def pause(self):
if not self.isStarted:
return
self.btnEnable.setVisible(True)
self.emit( SIGNAL( "selectionPaused()" ) )
def setExtent(self, rect):
if self.tool.setRectangle(rect):
self.emit( SIGNAL( "newExtentDefined()" ) )
def getExtent(self):
return self.tool.rectangle()
def isCoordsValid(self):
try:
point1 = QgsPoint( float(self.x1CoordEdit.text()), float(self.y1CoordEdit.text()) )
point2 = QgsPoint( float(self.x2CoordEdit.text()), float(self.y2CoordEdit.text()) )
except ValueError:
return False
return True
def coordsChanged(self):
rect = None
if self.isCoordsValid():
point1 = QgsPoint( float(self.x1CoordEdit.text()), float(self.y1CoordEdit.text()) )
point2 = QgsPoint( float(self.x2CoordEdit.text()), float(self.y2CoordEdit.text()) )
rect = QgsRectangle(point1, point2)
self.setExtent(rect)
def fillCoords(self):
rect = self.getExtent()
self.blockSignals(True)
if rect != None:
self.x1CoordEdit.setText( str(rect.xMinimum()) )
self.x2CoordEdit.setText( str(rect.xMaximum()) )
self.y1CoordEdit.setText( str(rect.yMaximum()) )
self.y2CoordEdit.setText( str(rect.yMinimum()) )
else:
self.x1CoordEdit.clear()
self.x2CoordEdit.clear()
self.y1CoordEdit.clear()
self.y2CoordEdit.clear()
self.blockSignals(False)
self.emit( SIGNAL( "newExtentDefined()" ) )
class RectangleMapTool(QgsMapToolEmitPoint):
def __init__(self, canvas):
self.canvas = canvas
QgsMapToolEmitPoint.__init__(self, self.canvas)
self.rubberBand = QgsRubberBand( self.canvas, QGis.Polygon )
self.rubberBand.setColor( QColor(255, 0, 0, 100) )
self.rubberBand.setWidth( 2 )
self.reset()
def reset(self):
self.startPoint = self.endPoint = None
self.isEmittingPoint = False
self.rubberBand.reset( QGis.Polygon )
def canvasPressEvent(self, e):
self.startPoint = self.toMapCoordinates( e.pos() )
self.endPoint = self.startPoint
self.isEmittingPoint = True
self.showRect(self.startPoint, self.endPoint)
def canvasReleaseEvent(self, e):
self.isEmittingPoint = False
#if self.rectangle() != None:
# self.emit( SIGNAL("rectangleCreated()") )
self.emit( SIGNAL("rectangleCreated()") )
def canvasMoveEvent(self, e):
if not self.isEmittingPoint:
return
self.endPoint = self.toMapCoordinates( e.pos() )
self.showRect(self.startPoint, self.endPoint)
def showRect(self, startPoint, endPoint):
self.rubberBand.reset( QGis.Polygon )
if startPoint.x() == endPoint.x() or startPoint.y() == endPoint.y():
return
point1 = QgsPoint(startPoint.x(), startPoint.y())
point2 = QgsPoint(startPoint.x(), endPoint.y())
point3 = QgsPoint(endPoint.x(), endPoint.y())
point4 = QgsPoint(endPoint.x(), startPoint.y())
self.rubberBand.addPoint( point1, False )
self.rubberBand.addPoint( point2, False )
self.rubberBand.addPoint( point3, False )
self.rubberBand.addPoint( point4, True ) # true to update canvas
self.rubberBand.show()
def rectangle(self):
if self.startPoint == None or self.endPoint == None:
return None
elif self.startPoint.x() == self.endPoint.x() or self.startPoint.y() == self.endPoint.y():
return None
return QgsRectangle(self.startPoint, self.endPoint)
def setRectangle(self, rect):
if rect == self.rectangle():
return False
if rect == None:
self.reset()
else:
self.startPoint = QgsPoint(rect.xMaximum(), rect.yMaximum())
self.endPoint = QgsPoint(rect.xMinimum(), rect.yMinimum())
self.showRect(self.startPoint, self.endPoint)
return True
def deactivate(self):
QgsMapTool.deactivate(self)
self.emit(SIGNAL("deactivated()"))
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