本文整理汇总了Python中qgis.gui.QgsMapCanvas.refreshAllLayers方法的典型用法代码示例。如果您正苦于以下问题：Python QgsMapCanvas.refreshAllLayers方法的具体用法？Python QgsMapCanvas.refreshAllLayers怎么用？Python QgsMapCanvas.refreshAllLayers使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类qgis.gui.QgsMapCanvas的用法示例。
在下文中一共展示了QgsMapCanvas.refreshAllLayers方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: testMapTheme
# 需要导入模块: from qgis.gui import QgsMapCanvas [as 别名]
# 或者: from qgis.gui.QgsMapCanvas import refreshAllLayers [as 别名]
def testMapTheme(self):
canvas = QgsMapCanvas()
canvas.setDestinationCrs(QgsCoordinateReferenceSystem(4326))
canvas.setFrameStyle(0)
canvas.resize(600, 400)
self.assertEqual(canvas.width(), 600)
self.assertEqual(canvas.height(), 400)
layer = QgsVectorLayer("Polygon?crs=epsg:4326&field=fldtxt:string",
"layer", "memory")
# add a polygon to layer
f = QgsFeature()
f.setGeometry(QgsGeometry.fromRect(QgsRectangle(5, 25, 25, 45)))
self.assertTrue(layer.dataProvider().addFeatures([f]))
# create a style
sym1 = QgsFillSymbol.createSimple({'color': '#ffb200'})
renderer = QgsSingleSymbolRenderer(sym1)
layer.setRenderer(renderer)
canvas.setLayers([layer])
canvas.setExtent(QgsRectangle(10, 30, 20, 35))
canvas.show()
# need to wait until first redraw can occur (note that we first need to wait till drawing starts!)
while not canvas.isDrawing():
app.processEvents()
canvas.waitWhileRendering()
self.assertTrue(self.canvasImageCheck('theme1', 'theme1', canvas))
# add some styles
layer.styleManager().addStyleFromLayer('style1')
sym2 = QgsFillSymbol.createSimple({'color': '#00b2ff'})
renderer2 = QgsSingleSymbolRenderer(sym2)
layer.setRenderer(renderer2)
layer.styleManager().addStyleFromLayer('style2')
canvas.refresh()
canvas.waitWhileRendering()
self.assertTrue(self.canvasImageCheck('theme2', 'theme2', canvas))
layer.styleManager().setCurrentStyle('style1')
canvas.refresh()
canvas.waitWhileRendering()
self.assertTrue(self.canvasImageCheck('theme1', 'theme1', canvas))
# OK, so all good with setting/rendering map styles
# try setting canvas to a particular theme
# make some themes...
theme1 = QgsMapThemeCollection.MapThemeRecord()
record1 = QgsMapThemeCollection.MapThemeLayerRecord(layer)
record1.currentStyle = 'style1'
record1.usingCurrentStyle = True
theme1.setLayerRecords([record1])
theme2 = QgsMapThemeCollection.MapThemeRecord()
record2 = QgsMapThemeCollection.MapThemeLayerRecord(layer)
record2.currentStyle = 'style2'
record2.usingCurrentStyle = True
theme2.setLayerRecords([record2])
QgsProject.instance().mapThemeCollection().insert('theme1', theme1)
QgsProject.instance().mapThemeCollection().insert('theme2', theme2)
canvas.setTheme('theme2')
canvas.refresh()
canvas.waitWhileRendering()
self.assertTrue(self.canvasImageCheck('theme2', 'theme2', canvas))
canvas.setTheme('theme1')
canvas.refresh()
canvas.waitWhileRendering()
self.assertTrue(self.canvasImageCheck('theme1', 'theme1', canvas))
# add another layer
layer2 = QgsVectorLayer("Polygon?crs=epsg:4326&field=fldtxt:string",
"layer2", "memory")
f = QgsFeature()
f.setGeometry(QgsGeometry.fromRect(QgsRectangle(5, 25, 25, 45)))
self.assertTrue(layer2.dataProvider().addFeatures([f]))
# create a style
sym1 = QgsFillSymbol.createSimple({'color': '#b2ff00'})
renderer = QgsSingleSymbolRenderer(sym1)
layer2.setRenderer(renderer)
# rerender canvas - should NOT show new layer
canvas.refresh()
canvas.waitWhileRendering()
self.assertTrue(self.canvasImageCheck('theme1', 'theme1', canvas))
# test again - this time refresh all layers
canvas.refreshAllLayers()
canvas.waitWhileRendering()
self.assertTrue(self.canvasImageCheck('theme1', 'theme1', canvas))
# add layer 2 to theme1
record3 = QgsMapThemeCollection.MapThemeLayerRecord(layer2)
theme1.setLayerRecords([record3])
QgsProject.instance().mapThemeCollection().update('theme1', theme1)
#.........这里部分代码省略.........