gluOrtho2D

NAME

gluOrtho2D -- define a 2-D orthographic projection matrix

C SPECIFICATION

void gluOrtho2D(GLdouble left,

GLdouble right,

GLdouble bottom,

GLdouble top)

PARAMETERS

left, right

Specify the coordinates for the left and right vertical clipping planes.

bottom, top

Specify the coordinates for the bottom and top horizontal clipping planes.

DESCRIPTION

gluOrtho2D sets up a two-dimensional orthographic viewing region. This is equivalent to calling glOrtho with near = 0 and far = 1.

【中文解释】　　　　

名称

gluOrtho2D定义了一个二维图像投影矩阵

C 语言说明

参数 left,right指明平面的左边和右边的垂直坐标

bottom,top

指明平面底部和顶部的水平坐标。

描述：建立了一个可视的二位平面区域。这个和用glOrtho函数效果是一样的当glOrtho的near=0，far=1时