OpenGL入门笔记（十七）

最新推荐文章于 2025-02-12 21:20:27 发布

iteye_5736

最新推荐文章于 2025-02-12 21:20:27 发布

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本文提供了一个使用OpenGL绘制三角形的示例程序，并演示了如何通过GLUT库初始化OpenGL环境，设置视口大小，绘制静态图形及进行窗口重置。

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#include<windows.h>
#include<GL/glut.h>
#include<math.h>
#include<stdlib.h>

voidInitGL(GLvoid)
{
glClearColor(1.0,1.0,1.0,1.0);

}

voidtriangle(void)
{
glBegin(GL_TRIANGLES);
glColor3f(1.0,1.0,0.0);
glVertex2f(10.0,10.0);
glColor3f(0.0,0.3,1.0);
glVertex2f(20.0,30.0);
glColor3f(1.0,0.0,0.0);
glVertex2f(30.0,10.0);
glEnd();
}

voidDrawScene()
{
inti;
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef(10.0,100.0,0.0);
triangle();
glPopMatrix();

for(i=0;i<5;i++)
{
glRasterPos2i(20+i*30,10+i*5);
glCopyPixels(50,200,500,500,GL_COLOR);
}
glPopMatrix();
glFlush();

}

voidReShape(intw,inth)
{
glViewport(0,0,(GLsizei)w,(GLsizei)h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if(w<=h)
gluOrtho2D(0.0,150,0.0,150.0*(GLfloat)h/(GLfloat)w);
else
gluOrtho2D(0.0,150.0*(GLfloat)w/(GLfloat)h,0.0,150.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();

}
intmain(intargc,char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB|GLUT_DEPTH);
glutInitWindowSize(500,400);
glutInitWindowPosition(100,100);
glutCreateWindow("OpenGL");
InitGL();
glutReshapeFunc(ReShape);
glutDisplayFunc(DrawScene);
glutMainLoop();
return0;
}