#include <windows.h>
#include <gl/gl.h>
#include <gl/glaux.h>
#include <gl/glu.h>
#pragma comment (lib,"openGL32.lib")
#pragma comment (lib,"glu32.lib")
#pragma comment (lib,"glaux.lib")
/************************************************************************/
/* 声明初始化函数,显示函数(包括视点变换和模型变换)
reshape函数(包括投影变换和视口变换)
drawobject函数(画图函数) */
/************************************************************************/
GLvoid myinit(GLvoid);
GLvoid CALLBACK display(GLvoid);
GLvoid CALLBACK myReshape(GLsizei w,GLsizei h);
GLvoid drawobject(GLvoid);
/*初始化函数*/
GLvoid myinit(GLvoid)
{
glClearColor(0.0,0.0,0.0,0.0);//清屏幕为黑色
glClear(GL_COLOR_BUFFER_BIT);//缓冲区也清为黑色
glShadeModel(GL_FLAT);
}
/*画图函数*/
GLvoid drawobject(GLvoid)
{
glBegin(GL_LINE_LOOP);
glVertex2f(0.0,25.0);
glVertex2f(-25.0,25.0);
glVertex2f(-25.0,-25.0);
glEnd();
}
/*显示函数*/
GLvoid CALLBACK display(GLvoid)
{
glLoadIdentity();
glColor3f(1.0,1.0,1.0);
drawobject();
glLoadIdentity();
glTranslatef(-25.0,0.0,0.0);
glColor3f(1.0,0.0,0.0);
drawobject();
glLoadIdentity();
glScalef(1.5,0.5,1.0);
glColor3f(0.0,1.0,0.0);
drawobject();
glLoadIdentity();
glRotatef(90.0,0.0,0.0,1.0);
glColor3f(0.0,0.0,1.0);
drawobject();
glLoadIdentity();
glScalef(1.0,-0.5,1.0);
glColor3f(1.0,1.0,0.0);
drawobject();
glFlush();
}
GLvoid CALLBACK myReshape(GLsizei w,GLsizei h)
{
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w<=h)
{
glOrtho(-50.0,50.0,-50.0*(GLfloat)h/(GLfloat)w,50.0*(GLfloat)h/(GLfloat)w,-1.0,1.0);
}
else
{
glOrtho(-50.0*(GLfloat)w/(GLfloat)h,50.0*(GLfloat)w/(GLfloat)h,-50.0,50.0,-1.0,1.0);
}
glMatrixMode(GL_MODELVIEW);
}
void main()
{
auxInitDisplayMode(AUX_SINGLE|AUX_RGBA);
auxInitPosition(0,0,500,500);
auxInitWindow("test3");
myinit();
auxReshapeFunc(myReshape);
auxMainLoop(display);
}
运行结果: