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# -*- 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__ = '$Format:%H$'
from qgis.core import *
from PyQt4 import QtGui, QtCore
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from processing.gui.RectangleMapTool import RectangleMapTool
from processing.parameters.ParameterRaster import ParameterRaster
from processing.parameters.ParameterVector import ParameterVector
from processing.parameters.ParameterMultipleInput import ParameterMultipleInput
from processing.tools import dataobjects
from qgis.utils import iface
class ExtentSelectionPanel(QtGui.QWidget):
def __init__(self, dialog, alg, default):
super(ExtentSelectionPanel, self).__init__(None)
self.dialog = dialog
self.params = alg.parameters
self.horizontalLayout = QtGui.QHBoxLayout(self)
self.horizontalLayout.setSpacing(2)
self.horizontalLayout.setMargin(0)
self.text = QtGui.QLineEdit()
self.text.setSizePolicy(QtGui.QSizePolicy.Expanding,
QtGui.QSizePolicy.Expanding)
if self.canUseAutoExtent():
if hasattr(self.text, 'setPlaceholderText'):
self.text.setPlaceholderText(
'[Leave blank to use min covering extent]')
self.horizontalLayout.addWidget(self.text)
self.pushButton = QtGui.QPushButton()
self.pushButton.setText('...')
self.pushButton.clicked.connect(self.buttonPushed)
self.horizontalLayout.addWidget(self.pushButton)
self.setLayout(self.horizontalLayout)
canvas = iface.mapCanvas()
self.prevMapTool = canvas.mapTool()
self.tool = RectangleMapTool(canvas)
self.connect(self.tool, SIGNAL('rectangleCreated()'), self.fillCoords)
def canUseAutoExtent(self):
for param in self.params:
if isinstance(param, (ParameterRaster, ParameterVector)):
return True
if isinstance(param, ParameterMultipleInput):
return True
return False
def buttonPushed(self):
popupmenu = QMenu()
useLayerExtentAction = QtGui.QAction('Use layer/canvas extent',
self.pushButton)
useLayerExtentAction.triggered.connect(self.useLayerExtent)
popupmenu.addAction(useLayerExtentAction)
selectOnCanvasAction = QtGui.QAction('Select extent on canvas',
self.pushButton)
selectOnCanvasAction.triggered.connect(self.selectOnCanvas)
popupmenu.addAction(selectOnCanvasAction)
if self.canUseAutoExtent():
useMincoveringExtentAction = \
QtGui.QAction('Use min covering extent from input layers',
self.pushButton)
useMincoveringExtentAction.triggered.connect(
self.useMinCoveringExtent)
popupmenu.addAction(useMincoveringExtentAction)
popupmenu.exec_(QtGui.QCursor.pos())
def useMinCoveringExtent(self):
self.text.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.getObjectFromUri(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.getObjectFromUri(layername, first)
if layer:
found = True
self.addToRegion(layer, first)
first = False
if found:
return str(self.xmin) + ',' + str(self.xmax) + ',' \
+ str(self.ymin) + ',' + str(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] = iface.mapCanvas().extent()
extents = [CANVAS_KEY]
layers = dataobjects.getAllLayers()
for layer in layers:
extents.append(layer.name())
extentsDict[layer.name()] = layer.extent()
(item, ok) = QtGui.QInputDialog.getItem(self, 'Select extent',
'Use extent from', extents, False)
if ok:
self.setValueFromRect(extentsDict[item])
def selectOnCanvas(self):
canvas = iface.mapCanvas()
canvas.setMapTool(self.tool)
self.dialog.showMinimized()
def fillCoords(self):
r = self.tool.rectangle()
self.setValueFromRect(r)
def setValueFromRect(self, r):
s = str(r.xMinimum()) + ',' + str(r.xMaximum()) + ',' \
+ str(r.yMinimum()) + ',' + str(r.yMaximum())
self.text.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 str(self.text.text()).strip() != '':
return str(self.text.text())
else:
return self.getMinCoveringExtent()
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