Hello,
I am new to python and the QGIS API and writing a plugin in python to
simulate/model insect dispersal.
I am using .ui files and Qt Designer. And i placed a QWidget on the form
and promote it to a new class: set QgsMapCanvas as class name and set
qgis.gui as header file.
I load a raster layer, set canvas color and so on. But the layer only
displays if i use QgsMapLayerRegistry.instance().addMapLayer(self.layer).
Without these code line my plugin only displays the rubber band, but not
the raster layer. But if i use ...addMapLayer() it also loads the layer
in QGIS. I want to have a behaviour like in the GDAL - Georeferenzierung
plugin. There you could add a raster layer and the plugin displays it
only in the plugin window, not in the QGIS MainWindow.
Here is the method code:
def addRasterLayer(self):
fileName = "NE2_50M_SR.tif"
fileInfo = QFileInfo(fileName)
baseName = fileInfo.baseName()
self.layer = QgsRasterLayer(fileName, baseName)
if not self.layer.isValid():
#error
#only with this line of code the raster layer will be displayed:
QgsMapLayerRegistry.instance().addMapLayer(self.layer)
self.canvas = self.dlg.ui.mapCanvasWidget
self.canvas.setCanvasColor(Qt.white)
self.canvas.setExtent(self.layer.extent())
self.canvas.setLayerSet( [ QgsMapCanvasLayer(self.layer) ] )
r = QgsRubberBand(self.dlg.ui.mapCanvasWidget, True)
points = [ [ QgsPoint(-10,-10), QgsPoint(0,10),
QgsPoint(10,-10) ] ]
r.setToGeometry(QgsGeometry.fromPolygon(points), None)
self.canvas.setCurrentLayer (self.layer)
self.canvas.setVisible(True);
self.canvas.refresh()
best regards,
Daniel
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