gluBeginPolygon function

[The gluBeginPolygon function is obsolete and is provided for backward compatibility only. The gluBeginPolygon function is mapped to gluTessBeginPolygon followed by gluTessBeginContour.]

The gluBeginPolygon and gluEndPolygon functions delimit a polygon description.

Syntax

void WINAPI gluBeginPolygon(
   GLUtesselator *tess
);

Parameters

tess

The tessellation object (created with gluNewTess).

Return value

This function does not return a value.

Remarks

Use gluBeginPolygon and gluEndPolygon to delimit the definition of a nonconvex polygon.

1. Call gluBeginPolygon.

2. Define the contours of the polygon by calling gluTessVertex for each vertex and gluNextContour to start each new contour.

3. Call gluEndPolygon to signal the end of the definition.

   Once gluEndPolygon is called, the polygon is tessellated, and the resulting triangles are described through callbacks. For descriptions of the callback functions, see gluTessCallback.

Examples

The following example describes a quadrilateral with a triangular hole:

gluBeginPolygon(tess); 
    gluTessVertex(tess, v1, v1); 
    gluTessVertex(tess, v2, v2); 
    gluTessVertex(tess, v3, v3); 
    gluTessVertex(tess, v4, v4); 
gluNextContour(tess, GLU_INTERIOR); 
    gluTessVertex(tess, v5, v5); 
    gluTessVertex(tess, v6, v6); 
    gluTessVertex(tess, v7, v7); 
gluEndPolygon(tess);

Requirements

See also

gluNewTess

gluNextContour

gluTessBeginContour

gluTessBeginPolygon

gluTessCallback

gluTessVertex