mapcanvas.py

                painter.drawLine(0, 0, 200, 200);
                painter.drawText(ULpx,  txt)


    def setShow(self, b):
        assert isinstance(b, bool)
        self.mShow = b

    def setShowTitles(self, b):
        assert isinstance(b, bool)
        self.mShowTitles = b


def exampleSyncedCanvases():
    global btnCrs, mapCanvases, lyrs, syncExtents
    import site, sys
    # add site-packages to sys.path as done by enmapboxplugin.py
    from timeseriesviewer import sandbox
    from timeseriesviewer.utils import SpatialExtent
    import example.Images
    qgsApp = sandbox.initQgisEnvironment()
    w = QWidget()
    hl1 = QHBoxLayout()
    hl2 = QHBoxLayout()
    btnCrs = QgsProjectionSelectionWidget(w)
    btnRefresh = QPushButton('Refresh', w)
    hl1.addWidget(btnCrs)
    hl1.addWidget(btnRefresh)
    vl = QVBoxLayout()
    vl.addLayout(hl1)
    vl.addLayout(hl2)
    w.setLayout(vl)
    files = [example.Images.Img_2014_01_15_LC82270652014015LGN00_BOA,
             example.Images.Img_2013_05_20_LC82270652013140LGN01_BOA,
             example.Images.Img_2013_08_16_LE72270652013228CUB00_BOA]
    mapCanvases = []
    lyrs = []

    def onRefresh(*args):

        crs = btnCrs.crs()
        ext = SpatialExtent.fromLayer(lyrs[0]).toCrs(crs)
        for mapCanvas in mapCanvases:
            mapCanvas.setCrs(crs)
            mapCanvas.setSpatialExtent(ext)
            mapCanvas.refresh()
            mapCanvas.refreshAllLayers()

    def syncExtents(ext):

        for mapCanvas in mapCanvases:

            oldext = SpatialExtent.fromMapCanvas(mapCanvas)
            if oldext != ext:
                mapCanvas.blockSignals(True)
                #mapCanvas.setExtent(ext)
                mapCanvas.setSpatialExtent(ext)
                mapCanvas.blockSignals(False)
                mapCanvas.refreshAllLayers()

    def registerMapCanvas(mapCanvas):
        mapCanvas.extentsChanged.connect(lambda: syncExtents(SpatialExtent.fromMapCanvas(mapCanvas)))

    for i, f in enumerate(files):
        ml = QgsRasterLayer(f)
        #QgsMapLayerRegistry.instance().addMapLayer(ml)
        lyrs.append(ml)

        #mapCanvas = QgsMapCanvas(w)
        mapCanvas = MapCanvas(w)
        mapCanvas.setCrsTransformEnabled(True)
        registerMapCanvas(mapCanvas)
        hl2.addWidget(mapCanvas)
        #mapCanvas.setLayers([QgsMapCanvasLayer(ml)])
        mapCanvas.setLayers([ml])

        if i == 0:
            btnCrs.setCrs(ml.crs())
        mapCanvases.append(mapCanvas)

        btnCrs.crsChanged.connect(onRefresh)
        btnRefresh.clicked.connect(onRefresh)
    w.show()
    onRefresh()
    qgsApp.exec_()
    qgsApp.exitQgis()

if __name__ == '__main__':
    from timeseriesviewer import utils
    from timeseriesviewer.mapcanvas import MapCanvas
    from example.Images import Img_2014_01_15_LC82270652014015LGN00_BOA
    from example import  exampleEvents
    qgsApp = utils.initQgisApplication()



    def printTimeDelta(dt):
        print(dt)
    c = MapCanvas()
    c.sigDataLoadingFinished.connect(printTimeDelta)
    c.show()
    lyr1 = QgsRasterLayer(Img_2014_01_15_LC82270652014015LGN00_BOA)
    lyr2 = QgsVectorLayer(exampleEvents, 'events', 'ogr', True)

    c.layerModel().addLayerInfo(lyr2)
    c.layerModel().addLayerInfo(lyr1)

    for l in c.layerModel().visibleLayers():
        print(l)

    c.setDestinationCrs(lyr1.crs())
    c.setExtent(lyr1.extent())
    c.refresh()
    qgsApp.exec_()