本文整理汇总了Python中qgis.core.QgsSymbolLayerV2Utils.fieldOrExpressionToExpression方法的典型用法代码示例。如果您正苦于以下问题：Python QgsSymbolLayerV2Utils.fieldOrExpressionToExpression方法的具体用法？Python QgsSymbolLayerV2Utils.fieldOrExpressionToExpression怎么用？Python QgsSymbolLayerV2Utils.fieldOrExpressionToExpression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.core.QgsSymbolLayerV2Utils的用法示例。
在下文中一共展示了QgsSymbolLayerV2Utils.fieldOrExpressionToExpression方法的2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: testQgsGraduatedSymbolRendererV2_1
# 需要导入模块: from qgis.core import QgsSymbolLayerV2Utils [as 别名]
# 或者: from qgis.core.QgsSymbolLayerV2Utils import fieldOrExpressionToExpression [as 别名]
def testQgsGraduatedSymbolRendererV2_1(self):
"""Test QgsGraduatedSymbolRendererV2: Basic get/set functions """
# Create a renderer
renderer = QgsGraduatedSymbolRendererV2()
symbol = createMarkerSymbol()
renderer.setSourceSymbol(symbol.clone())
self.assertEqual(symbol.dump(), renderer.sourceSymbol().dump(), "Get/set renderer source symbol")
attr = '"value"*"value"'
renderer.setClassAttribute(attr)
self.assertEqual(attr, renderer.classAttribute(), "Get/set renderer class attribute")
for m in (
QgsGraduatedSymbolRendererV2.Custom,
QgsGraduatedSymbolRendererV2.EqualInterval,
QgsGraduatedSymbolRendererV2.Quantile,
QgsGraduatedSymbolRendererV2.Jenks,
QgsGraduatedSymbolRendererV2.Pretty,
QgsGraduatedSymbolRendererV2.StdDev,
):
renderer.setMode(m)
self.assertEqual(m, renderer.mode(), "Get/set renderer mode")
format = createLabelFormat()
renderer.setLabelFormat(format)
self.assertEqual(
dumpLabelFormat(format),
dumpLabelFormat(renderer.labelFormat()),
"Get/set renderer label format")
ramp = createColorRamp()
renderer.setSourceColorRamp(ramp)
self.assertEqual(
dumpColorRamp(ramp),
dumpColorRamp(renderer.sourceColorRamp()),
"Get/set renderer color ramp")
renderer.setInvertedColorRamp(True)
self.assertTrue(renderer.invertedColorRamp(),
"Get/set renderer inverted color ramp")
renderer.setInvertedColorRamp(False)
self.assertFalse(renderer.invertedColorRamp(),
"Get/set renderer inverted color ramp")
value = '"value"*2'
exp = QgsSymbolLayerV2Utils.fieldOrExpressionToExpression(value)
valuestr = QgsSymbolLayerV2Utils.fieldOrExpressionFromExpression(exp)
renderer.setRotationField(value)
self.assertEqual(valuestr, renderer.rotationField(),
"Get/set renderer rotation field")
value = '"value"*3'
exp = QgsSymbolLayerV2Utils.fieldOrExpressionToExpression(value)
valuestr = QgsSymbolLayerV2Utils.fieldOrExpressionFromExpression(exp)
renderer.setSizeScaleField(value)
self.assertEqual(valuestr, renderer.sizeScaleField(),
"Get/set renderer size scale field")
renderer.setSourceColorRamp(ramp)
self.assertEqual(
dumpColorRamp(ramp),
dumpColorRamp(renderer.sourceColorRamp()),
"Get/set renderer color ramp")
for sm in (
QgsSymbolV2.ScaleArea,
QgsSymbolV2.ScaleDiameter,
):
renderer.setScaleMethod(sm)
self.assertEqual(str(sm), str(renderer.scaleMethod()),
"Get/set renderer scale method")
# test for classificatio with varying size
renderer.setGraduatedMethod(QgsGraduatedSymbolRendererV2.GraduatedSize)
renderer.setSourceColorRamp(None)
renderer.addClassLowerUpper(0, 2)
renderer.addClassLowerUpper(2, 4)
renderer.addClassLowerUpper(4, 6)
renderer.setSymbolSizes(2, 13)
self.assertEqual(renderer.maxSymbolSize(), 13)
self.assertEqual(renderer.minSymbolSize(), 2)
refSizes = [2, (13 + 2) * .5, 13]
ctx = QgsRenderContext()
for idx, symbol in enumerate(renderer.symbols2(ctx)):
self.assertEqual(symbol.size(), refSizes[idx])示例2: testQgsGraduatedSymbolRendererV2_1
# 需要导入模块: from qgis.core import QgsSymbolLayerV2Utils [as 别名]
# 或者: from qgis.core.QgsSymbolLayerV2Utils import fieldOrExpressionToExpression [as 别名]
def testQgsGraduatedSymbolRendererV2_1(self):
"""Test QgsGraduatedSymbolRendererV2: Basic get/set functions """
# Create a renderer
renderer=QgsGraduatedSymbolRendererV2()
symbol=createMarkerSymbol()
renderer.setSourceSymbol(symbol.clone())
self.assertEqual(symbol.dump(),renderer.sourceSymbol().dump(),"Get/set renderer source symbol")
attr='"value"*"value"'
renderer.setClassAttribute(attr)
self.assertEqual(attr,renderer.classAttribute(),"Get/set renderer class attribute")
for m in (
QgsGraduatedSymbolRendererV2.Custom,
QgsGraduatedSymbolRendererV2.EqualInterval,
QgsGraduatedSymbolRendererV2.Quantile,
QgsGraduatedSymbolRendererV2.Jenks,
QgsGraduatedSymbolRendererV2.Pretty,
QgsGraduatedSymbolRendererV2.StdDev,
):
renderer.setMode(m)
self.assertEqual(m,renderer.mode(),"Get/set renderer mode")
format=createLabelFormat()
renderer.setLabelFormat(format)
self.assertEqual(
dumpLabelFormat(format),
dumpLabelFormat(renderer.labelFormat()),
"Get/set renderer label format")
ramp=createColorRamp()
renderer.setSourceColorRamp(ramp)
self.assertEqual(
dumpColorRamp(ramp),
dumpColorRamp(renderer.sourceColorRamp()),
"Get/set renderer color ramp")
renderer.setInvertedColorRamp(True)
self.assertTrue(renderer.invertedColorRamp(),
"Get/set renderer inverted color ramp")
renderer.setInvertedColorRamp(False)
self.assertFalse(renderer.invertedColorRamp(),
"Get/set renderer inverted color ramp")
value='"value"*2'
exp=QgsSymbolLayerV2Utils.fieldOrExpressionToExpression(value)
valuestr=QgsSymbolLayerV2Utils.fieldOrExpressionFromExpression(exp)
renderer.setRotationField(value)
self.assertEqual(valuestr,renderer.rotationField(),
"Get/set renderer rotation field")
value='"value"*3'
exp=QgsSymbolLayerV2Utils.fieldOrExpressionToExpression(value)
valuestr=QgsSymbolLayerV2Utils.fieldOrExpressionFromExpression(exp)
renderer.setSizeScaleField(value)
self.assertEqual(valuestr,renderer.sizeScaleField(),
"Get/set renderer size scale field")
renderer.setSourceColorRamp(ramp)
self.assertEqual(
dumpColorRamp(ramp),
dumpColorRamp(renderer.sourceColorRamp()),
"Get/set renderer color ramp")
for sm in (
QgsSymbolV2.ScaleArea,
QgsSymbolV2.ScaleDiameter,
):
renderer.setScaleMethod(sm)
self.assertEqual(str(sm),str(renderer.scaleMethod()),
"Get/set renderer scale method")