Programming and Graphics

8.1 Glut 259

GLPOLYGON

Draws a convexN-sided polygon defined by the vertices.

GLLINES

Nmust be even. Each pair of vertices defines a line segment.

GLLINELOOP

Draws a closed polygonal line passing through theNvertices.

GLTRIANGLES

Each consecutive triplet of vertices defines a triangle, for a total ofT=

V/3 triangles, whereV is the number of vertices;V must be a multiple

of three.

GLTRIANGLESTRIP

Draws a connected group ofN−2 triangles. A triangle is defined by any

three successive vertices.

GLTRIANGLEFAN

Draws a connected group ofN−2 triangles. A triangle is defined by the

first vertex and consecutive pairs of subsequent vertices.

GLQUADS

Each consecutive quadruplet of vertices defines a quadrilateral, for a total

ofQ=V/4 elements, whereV is the number of vertices;V must be a

multiple of four.

GLQUADSTRIP

Draw a connected group ofQ=V/ 2 −1 quadrilaterals, whereV is the

number of vertices;V must be even. A quadrilateral is defined by any

two successive vertex pairs. For example, whenV= 4, one quadrilateral

is drawn.

Functions defining vertices include, but are not limited to:

glVertex2f glVertex2d

glVertex3f glVertex3d