Class: QgsRasterShaderFunction¶
-
class
qgis.core.
QgsRasterShaderFunction
¶ Bases:
sip.wrapper
The raster shade function applies a shader to a pixel at render time - typically used to render grayscale images as false color.
Methods
Returns legend symbology items if provided by renderer.
Returns the minimum value for the raster shader.
- rtype
float
Returns the maximum value for the raster shader.
Sets the maximum
value
for the raster shader.Sets the minimum
value
for the raster shader.Generates an new RGBA value based on one input
value
.-
legendSymbologyItems
(self) → List[Tuple[str, QColor]]¶ Returns legend symbology items if provided by renderer.
- Return type
List[Tuple[str, QColor]]
-
maximumValue
(self) → float¶ Returns the minimum value for the raster shader.
See also
See also
- Return type
float
-
minimumMaximumRange
(self) → float¶ - Return type
float
-
minimumValue
(self) → float¶ Returns the maximum value for the raster shader.
See also
See also
- Return type
float
-
setMaximumValue
(self, value: float)¶ Sets the maximum
value
for the raster shader.See also
See also
- Parameters
value (float) –
-
setMinimumValue
(self, value: float)¶ Sets the minimum
value
for the raster shader.See also
See also
- Parameters
value (float) –
-
shade
(self, value: float) → Tuple[bool, int, int, int, int]¶ Generates an new RGBA value based on one input
value
.- Parameters
value (float) – The original value to base a new RGBA value on
returnRedValue – The red component of the new RGBA value
returnGreenValue – The green component of the new RGBA value
returnBlueValue – The blue component of the new RGBA value
returnAlpha – The alpha component of the new RGBA value
- Returns
True if the return values are valid otherwise false
shade(self, redValue: float, greenValue: float, blueValue: float, alphaValue: float) -> Tuple[bool, int, int, int, int] Generates an new RGBA value based on an original RGBA value.
- Parameters
redValue – The red component of the original value to base a new RGBA value on
greenValue – The green component of the original value to base a new RGBA value on
blueValue – The blue component of the original value to base a new RGBA value on
alphaValue – The alpha component of the original value to base a new RGBA value on
returnRedValue – The red component of the new RGBA value
returnGreenValue – The green component of the new RGBA value
returnBlueValue – The blue component of the new RGBA value
returnAlpha – The alpha component of the new RGBA value
- Return type
Tuple[bool, int, int, int, int]
- Returns
True if the return values are valid otherwise false