 | XGraphicsglBegin Method |
The glBegin and glend functions delimit the vertices of a primitive or a group of like primitives.
Namespace: Pixoneer.NXDL.NGR
Assembly: NXDLgr (in NXDLgr.dll) Version: 1.2.817.72
SyntaxC#
public void glBegin( int mode )
Parameters
- mode
- Type: SystemInt32
The primitive or primitives that will be created from vertices presented between glBegin and the subsequent glEnd. The following are accepted symbolic constants and their meanings:
Return Value
Type:This function does not return a value.
Remarks
The primitive or primitives that will be created from vertices presented between glBegin and the subsequent glEnd. The following are accepted symbolic constants and their meanings:
| Value | Meaning |
|---|---|
| XGraphics.GL_POINTS | Treats each vertex as a single point. Vertex n defines point n. N points are drawn. |
| XGraphics.GL_LINES | Treats each pair of vertices as an independent line segment. Vertices 2n - 1 and 2n define line n. N/2 lines are drawn |
| XGraphics.GL_LINE_STRIP | Treats each pair of vertices as an independent line segment. Vertices 2n - 1 and 2n define line n. N/2 lines are drawn. |
| XGraphics.GL_LINE_LOOP | Draws a connected group of line segments from the first vertex to the last, then back to the first. Vertices n and n + 1 define line n. The last line, however, is defined by vertices N and 1. N lines are drawn. Draws a connected group of line segments from the first vertex to the last, then back to the first. Vertices n and n + 1 define line n. The last line, however, is defined by vertices N and 1. N lines are drawn.Draws a connected group of line segments from the first vertex to the last, then back to the first. Vertices n and n + 1 define line n. The last line, however, is defined by vertices N and 1. N lines are drawn. |
| XGraphics.GL_TRIANGLES | Treats each triplet of vertices as an independent triangle. Vertices 3n - 2, 3n - 1, and 3n define triangle n. N/3 triangles are drawn. |
| XGraphics.GL_TRIANGLE_STRIP | Draws a connected group of triangles. One triangle is defined for each vertex presented after the first two vertices. For odd n, vertices n, n + 1, and n + 2 define triangle n. For even n, vertices n + 1, n, and n + 2 define triangle n. N - 2 triangles are drawn. |
| XGraphics.GL_TRIANGLE_FAN | Draws a connected group of triangles. one triangle is defined for each vertex presented after the first two vertices. Vertices 1, n + 1, n + 2 define triangle n. N - 2 triangles are drawn. |
| XGraphics.GL_QUADS | Treats each group of four vertices as an independent quadrilateral. Vertices 4n - 3, 4n - 2, 4n - 1, and 4n define quadrilateral n. N/4 quadrilaterals are drawn. |
| XGraphics.GL_QUAD_STRIP | Draws a connected group of quadrilaterals. One quadrilateral is defined for each pair of vertices presented after the first pair. Vertices 2n - 1, 2n, 2n + 2, and 2n + 1 define quadrilateral n. N/2 - 1 quadrilaterals are drawn. Note that the order in which vertices are used to construct a quadrilateral from strip data is different from that used with independent data. |
| XGraphics.GL_POLYGON | Draws a single, convex polygon. Vertices 1 through N define this polygon. |
See Also