显示窗口和由示例程序生成的线段

#include<GL/glut.h>


void init(void)


{


glClearColor(1.0,1.0,1.0,0.0);


glMatrixMode(GL_PROJECTION);


gluOrtho2D(0.0,200.0,0.0,150.0);


}




void lineSegment(void)


{


glClear(GL_COLOR_BUFFER_BIT);


glColor3f(1.0,0.0,0.0);


glBegin (GL_LINES);


glVertex2i(180,15);


glVertex2i(10,145);


glEnd();


glFlush();


}


void main(int argc,char**argv)


{


glutInit(&argc,argv);


glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);


glutInitWindowPosition(50,100);


glutInitWindowSize(400,300);


glutCreateWindow("An Example OpenGL Program");


init();


glutDisplayFunc(lineSegment);


glutMainLoop();




}


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