def mkRasterShader(layer,
color_ramp,
classif_mode=QgsColorRampShader.Continuous):
min, med, max = getValuesFromLayer3(layer)
rasterShader = QgsRasterShader(minimumValue=min, maximumValue=max)
colorRamp = getRandomSingleColorRamp()
if not color_ramp:
utils.internal_error("Could not create color ramp")
colorRampShader = QgsColorRampShader(minimumValue=min,
maximumValue=max,
colorRamp=color_ramp,
classificationMode=classif_mode)
colorRampShader.classifyColorRamp(band=1, input=layer.dataProvider())
if colorRampShader.isEmpty():
utils.internal_error("Empty color ramp shader")
rasterShader.setRasterShaderFunction(colorRampShader)
return rasterShader
