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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 qgis.PyQt.QtCore import pyqtSignal
from qgis.PyQt.QtWidgets import QWidget
from qgis.PyQt.QtGui import QColor
from qgis.core import QgsPoint, QgsRectangle, QGis
from qgis.gui import QgsMapTool, QgsMapToolEmitPoint, QgsRubberBand
from .ui_extentSelector import Ui_GdalToolsExtentSelector as Ui_ExtentSelector
class GdalToolsExtentSelector(QWidget, Ui_ExtentSelector):
selectionStarted = pyqtSignal()
selectionStopped = pyqtSignal()
selectionPaused = pyqtSignal()
newExtentDefined = pyqtSignal()
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.x1CoordEdit.textChanged.connect(self.coordsChanged)
self.x2CoordEdit.textChanged.connect(self.coordsChanged)
self.y1CoordEdit.textChanged.connect(self.coordsChanged)
self.y2CoordEdit.textChanged.connect(self.coordsChanged)
self.btnEnable.clicked.connect(self.start)
def setCanvas(self, canvas):
self.canvas = canvas
self.tool = RectangleMapTool(self.canvas)
self.previousMapTool = self.canvas.mapTool()
self.tool.rectangleCreated.connect(self.fillCoords)
self.tool.deactivated.connect(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.selectionStopped.emit()
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.selectionStarted.emit()
def pause(self):
if not self.isStarted:
return
self.btnEnable.setVisible(True)
self.selectionPaused.emit()
def setExtent(self, rect):
if self.tool.setRectangle(rect):
self.newExtentDefined.emit()
def getExtent(self):
return self.tool.rectangle()
def isCoordsValid(self):
try:
QgsPoint(float(self.x1CoordEdit.text()), float(self.y1CoordEdit.text()))
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 is not None:
self.x1CoordEdit.setText(unicode(rect.xMinimum()))
self.x2CoordEdit.setText(unicode(rect.xMaximum()))
self.y1CoordEdit.setText(unicode(rect.yMaximum()))
self.y2CoordEdit.setText(unicode(rect.yMinimum()))
else:
self.x1CoordEdit.clear()
self.x2CoordEdit.clear()
self.y1CoordEdit.clear()
self.y2CoordEdit.clear()
self.blockSignals(False)
self.newExtentDefined.emit()
class RectangleMapTool(QgsMapToolEmitPoint):
rectangleCreated = pyqtSignal()
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
self.rectangleCreated.emit()
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 is None or self.endPoint is 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 is 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.deactivated.emit()
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