OpenGL编程轻松入门之使用颜色

　　通过上一节的例子我们已经知道一些简单的使用颜色的方法。这一节我们进一步讲讲颜色的使用。

　　例2：本例子使用颜色引索模式绘制8个不同颜色的球体，如图二所示。阅读此例时，请主要关注函数palette和DrawColotFans。

　　glIndex设置当前颜色索引。参数为当前颜色索引。本例中glIndexd 函数的参数j+1对应palette中auxSetOneColor函数中的i+1，auxSetOneColor函数的后三个函数制定对应的颜色，颜色值由变量rgb[8][3]定义。

#include <GL/glut.h>
#include <GL/glaux.h> 
void init(void)
{
　glClearColor(1.0,1.0,1.0,1.0);
　glClear(GL_COLOR_BUFFER_BIT);
　glShadeModel(GL_SMOOTH);
}

void palette(void)
{
　GLint i;
　static GLfloat rgb[8][3]={{1,0,0},{1,0,0.5},{1,0,1},
{0,0,1},{0,1,1},{0,1,0},{1,1,0},{1,0.5,0}};

　for(i = 0;i<8;i++)
　{
　　auxSetOneColor(i+1,rgb[i][0],rgb[i][1],rgb[i][2]);//设置颜色
　}
}

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void DrawColorFans(void)
{
　GLint j;

　glTranslatef(-15,-15,0);
　for(j = 0;j<8;j++)
　{
　　glIndexd(j+1);//设置当前颜色索引
　　/*在不同位置绘制球体*/
　　glTranslatef(j,j-1,0);
　　glutSolidSphere(1,20,20);
　}
}

void CALLBACK display(void)
{
　palette();
　DrawColorFans();
　glFlush();
}

void CALLBACK reshape(GLsizei w,GLsizei h)
{
　glViewport(0,0,w,h);
　glMatrixMode(GL_PROJECTION);
　glLoadIdentity();
　gluPerspective(100,1,1,20);
　glMatrixMode(GL_MODELVIEW);
　glLoadIdentity();
　glTranslatef(0,0,-15);
}
void main()
{
　auxInitDisplayMode(AUX_SINGLE|AUX_INDEX);
　auxInitPosition(100,100,500,500);
　auxInitWindow("draw the color sphere");
　init();
　auxReshapeFunc(reshape);
　auxMainLoop(display);
}