#include <windows.h>
#include <GL/gl.h>
#include <GL/glaux.h>
void myinit(void);
void InitPalette(void);
void DrawColorFans(void);
void CALLBACK myReshape(GLsizei w,GLsizei h);
void CALLBACK display(void);
void myinit(void)
{
glClearColor(0.0,0.0,0.0,0.0);
glClear(GL_COLOR_BUFFER_BIT);
glShadeModel(GL_FLAT);
}
void InitPalette(void)
{
GLint j;
static GLfloat rgb[][3]={
{1.0,0.0,0.0},{1.0,0.0,0.5},{1.0,0.0,1.0},{0.0,0.0,1.0},
{0.0,1.0,1.0},{0.0,1.0,0.0},{1.0,1.0,0.0},{1.0,0.5,0.0}};
for(j=0;j<8;j++)
auxSetOneColor(j+1,rgb[j][0],rgb[j][1],rgb[j][2]);
}
void CALLBACK myReshape(GLsizei w,GLsizei h)
{
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if(w<=h)
glOrtho(-12.0,12.0,-12.0*(GLfloat)h/(GLfloat)w, 12.0*(GLfloat)h/(GLfloat)w,-30.0,30.0);
else
glOrtho(-12.0*(GLfloat)h/(GLfloat)w, 12.0*(GLfloat)h/(GLfloat)w,-12.0,12.0,-30.0,30.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void CALLBACK display(void)
{
InitPalette();
DrawColorFans();
glFlush();
}
void DrawColorFans(void)
{
GLint n;
GLfloat pp[8][2]={
{7.0,-7.0},{0.0,-10.0},{-7.0,-7.0},{-10.0,0.0},
{-7.0,7.0}, {0.0,10.0},{7.0,7.0},{10.0,0.0}};
/* draw some filled_fan_triangles */
glBegin(GL_TRIANGLE_FAN);
glVertex2f(0.0,0.0);
glVertex2f(10.0,0.0);
for(n=0;n<8;n++)
{
glIndexi(n+1);
glVertex2fv(pp[n]);
}
glEnd();
}
void main(void)
{
auxInitDisplayMode(AUX_SINGLE|AUX_INDEX);
auxInitPosition(0,0,500,500);
auxInitWindow("Color Index");
myinit();
auxReshapeFunc(myReshape);
auxMainLoop(display);
}
