Class: QgsTessellator¶
-
class
qgis.core.
QgsTessellator
(originX: float, originY: float, addNormals: bool, invertNormals: bool = False, addBackFaces: bool = False)¶ Bases:
sip.wrapper
Creates tessellator with a specified origin point of the world (in map coordinates)
QgsTessellator(
QgsTessellator
)Class that takes care of tessellation of polygons into triangles.
It is expected that client code will create the tessellator object, then repeatedly call addPolygon() method that will generate triangles, and finally call data() to get final vertex data.
Optionally provides extrusion by adding triangles that serve as walls when extrusion height is non-zero.
New in version 3.4.
- Parameters
originX (float) –
originY (float) –
addNormals (bool) –
invertNormals (bool = False) –
addBackFaces –
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addPolygon
(self, polygon: QgsPolygon, extrusionHeight: float)¶ Tessellates a triangle and adds its vertex entries to the output data array
- Parameters
polygon (QgsPolygon) –
extrusionHeight (float) –
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data
(self) → List[float]¶ Returns array of triangle vertex data
Vertice coordinates are stored as (x, z, -y)
- Return type
List[float]
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dataVerticesCount
(self) → int¶ Returns the number of vertices stored in the output data array
- Return type
int
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stride
(self) → int¶ Returns size of one vertex entry in bytes
- Return type
int