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tilemapscalelevels.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
TileMapScaleLevels
A QGIS plugin
Set the scale to the next matching Tile Map Scale.
-------------------
begin : 2013-01-23
copyright : (C) 2013 by Matthias Ludwig - Datalyze Solutions
email : [email protected]
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
"""
# Import the PyQt and QGIS libraries
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4 import uic
from qgis.core import *
from qgis.gui import *
import os
import math
# Initialize Qt resources from file resources.py
import resources_rc
from ui_info import Ui_info
class TileMapScaleLevelPlugin():
def __init__(self, iface):
# Save reference to the QGIS interface
self.iface = iface
self.canvas = self.iface.mapCanvas()
# initialize plugin directories
self.workingDir = os.path.dirname(os.path.abspath(__file__))
self.datasetDir = os.path.join(self.workingDir, "datasets")
if not os.path.exists(self.datasetDir):
self.iface.messageBar().pushMessage("Error", "Can't find %s. You wont't be able to load any datasets." % self.datasetDir, QgsMessageBar.CRITICAL)
# initialize locale
localePath = ""
locale = QSettings().value("locale/userLocale", type=str)[0:2]
if QFileInfo(self.workingDir).exists():
localePath = self.workingDir + "/i18n/tilemapscalelevels_" + locale + ".qm"
if QFileInfo(localePath).exists():
self.translator = QTranslator()
self.translator.load(localePath)
if qVersion() > '4.3.3':
QCoreApplication.installTranslator(self.translator)
def initGui(self):
# Create action that will start plugin configuration
self.action = QAction(QIcon(":/icons/icon.png"), u"Tile Map Scale Plugin", self.iface.mainWindow())
# Add toolbar button and menu item
self.iface.addToolBarIcon(self.action)
self.iface.addPluginToMenu(u"&Tile Map Scale Plugin", self.action)
self.action.triggered.connect(self.showDock)
self.dock = uic.loadUi(os.path.join(self.workingDir, "ui_tilemapscalelevels.ui"))
self.iface.addDockWidget(Qt.LeftDockWidgetArea, self.dock)
self.projection = self.canvas.mapRenderer().destinationCrs()
self.canvas.enableAntiAliasing(True)
self.readStatus()
## use old style connect. new style will fail cause of a bug.
QObject.connect(self.canvas, SIGNAL("scaleChanged(double)"), self.scaleChanged)
#self.canvas.scaleChanged.connect(self.scaleChanged)
self.dock.spinBoxZoomlevels.setKeyboardTracking(False)
self.dock.sliderZoomlevels.sliderReleased.connect(self.sliderReleased)
self.dock.spinBoxZoomlevels.valueChanged.connect(self.valueChanged)
self.dock.checkBoxIsActive.stateChanged.connect(self.activationStateChanged)
self.dock.checkBoxUseMercator.stateChanged.connect(self.useMercator)
self.dock.checkBoxUseOnTheFlyTransformation.stateChanged.connect(self.useOnTheFlyTransformation)
self.dock.buttonInfo.clicked.connect(self.showInfo)
self.dock.buttonLoadOSM.clicked.connect(self.loadOSM)
self.dock.buttonLoadUserDataset.clicked.connect(self.loadSelectedUserDataset)
self.dock.buttonLoadRefreshUserDatasets.clicked.connect(self.initUserDatasets)
self.scaleCalculator = TileMapScaleLevels()
self.initUserDatasets()
def showDock(self):
if self.dock.isVisible():
self.dock.hide()
else:
self.dock.show()
def unload(self):
# Remove the plugin menu item and icon
self.iface.removePluginMenu(u"&Tile Map Scale Plugin", self.action)
self.iface.removeToolBarIcon(self.action)
def showInfo(self):
self.dialogInfo = dialogInfo(self.workingDir)
self.dialogInfo.setParent(self.iface.mainWindow(), self.dialogInfo.windowFlags())
self.dialogInfo.exec_()
def sliderReleased(self):
print self.dock.sliderZoomlevels.value()
self.dock.spinBoxZoomlevels.setValue(self.dock.sliderZoomlevels.value())
def valueChanged(self):
zoomlevel = self.dock.spinBoxZoomlevels.value()
scale = self.scaleCalculator.getScale(zoomlevel)
self.scaleChanged(scale)
def loadOSM(self):
datasetPath = os.path.join(self.datasetDir, "osm_mapnik.xml")
if os.path.exists(datasetPath):
self.iface.addRasterLayer(datasetPath, "OpenStreetMap - Mapnik")
else:
self.iface.messageBar().pushMessage("Error", "Unable to load file %s" % datasetPath, QgsMessageBar.CRITICAL)
def initUserDatasets(self):
self.dock.comboBoxUserDatasets.clear()
for filename in os.listdir(self.datasetDir):
if not filename.endswith('.xml'): continue
print filename
self.dock.comboBoxUserDatasets.addItem(filename)
def loadSelectedUserDataset(self):
selectedDataset = str(self.dock.comboBoxUserDatasets.currentText())
datasetPath = os.path.join(self.datasetDir, selectedDataset)
errorMessage = "Unable to load file %s" % datasetPath
if (selectedDataset == ""):
self.iface.messageBar().pushMessage("Error", errorMessage, QgsMessageBar.CRITICAL)
elif os.path.exists(datasetPath):
self.iface.addRasterLayer(datasetPath, selectedDataset)
else:
self.iface.messageBar().pushMessage("Error", errorMessage, QgsMessageBar.CRITICAL)
def scaleChanged(self, scale):
if self.dock.checkBoxIsActive.isChecked():
## Disconnect to prevent infinite scaling loop
QObject.disconnect(self.canvas, SIGNAL("scaleChanged(double)"), self.scaleChanged)
self.dock.spinBoxZoomlevels.valueChanged.disconnect(self.valueChanged)
zoomlevel = self.scaleCalculator.getZoomlevel(scale)
if zoomlevel <> None:
newScale = self.scaleCalculator.getScale(zoomlevel)
self.canvas.zoomScale(newScale)
self.dock.sliderZoomlevels.setValue(zoomlevel)
self.dock.spinBoxZoomlevels.setValue(zoomlevel)
QObject.connect(self.canvas, SIGNAL("scaleChanged(double)"), self.scaleChanged)
self.dock.spinBoxZoomlevels.valueChanged.connect(self.valueChanged)
def activationStateChanged(self):
if self.dock.checkBoxIsActive.isChecked():
self.dock.groupBox.show()
else:
self.dock.groupBox.hide()
self.storeStatus()
def useMercator(self):
if self.dock.checkBoxUseMercator.isChecked():
coordinateReferenceSystem = QgsCoordinateReferenceSystem()
createCrs = coordinateReferenceSystem.createFromString("EPSG:3857")
if self.projection != coordinateReferenceSystem:
self.projection = self.canvas.mapRenderer().destinationCrs()
self.canvas.mapRenderer().setDestinationCrs(coordinateReferenceSystem)
else:
self.canvas.mapRenderer().setDestinationCrs(self.projection)
def useOnTheFlyTransformation(self):
if self.dock.checkBoxUseOnTheFlyTransformation.isChecked():
self.canvas.mapRenderer().setProjectionsEnabled(True)
else:
self.canvas.mapRenderer().setProjectionsEnabled(False)
def storeStatus(self):
s = QSettings()
s.setValue("tilemapscalelevels/active", self.dock.checkBoxIsActive.isChecked())
def readStatus(self):
s = QSettings()
isActive = s.value("tilemapscalelevels/active", True, type=bool)
self.dock.checkBoxIsActive.setChecked(isActive)
class TileMapScaleLevels:
def __init__(self, dpi = 96):
self.dpi = dpi
self.inchesPerMeter = 39.37
self.maxScalePerPixel = 156543.04
def getScale(self, zoomlevel):
if zoomlevel < 0:
return (self.dpi * self.inchesPerMeter * self.maxScalePerPixel) / (math.pow(2, 0))
else:
zoomlevel = int(zoomlevel)
return (self.dpi * self.inchesPerMeter * self.maxScalePerPixel) / (math.pow(2, zoomlevel))
def getZoomlevel(self, scale):
if scale <> 0:
return int(round(math.log( ((self.dpi * self.inchesPerMeter * self.maxScalePerPixel) / scale), 2 ), 0))
class dialogInfo(QDialog, Ui_info):
def __init__(self, workingDir, infoHtml="info.html"):
super(dialogInfo, self).__init__()
self.setupUi(self)
self.workingDir = workingDir
self.infoHtml = infoHtml
self.goHome()
self.buttonHome.clicked.connect(self.goHome)
def goHome(self):
url = os.path.join(self.workingDir, self.infoHtml)
self.webView.setUrl(QUrl(url))