OpenGL的填充属性函数之线框图中消除选定边

 OpenGL的填充属性函数————

线框图中消除选定边

这个较为简单，只需将该位标志设为关，从而使在这个顶点之后的边不被显示。
程序代码为：

 #include <windows.h>

 #include <GL/gl.h>

 #include <GL/glu.h>

 #include <GL/glut.h>

 void display(void)

 {

 glClear(GL_COLOR_BUFFER_BIT);

    glColor3f(0.0,1.0,0.0);

 glEnable(GL_POLYGON_OFFSET_FILL);

 glPolygonOffset(1.0,1.0);

 glBegin(GL_TRIANGLES);

 glVertex2i(50,50);

 glVertex2i(150,50);

 glVertex2i(75,150);

 glEnd();

 glDisable(GL_POLYGON_OFFSET_FILL);

 glColor3f(1.0,0.0,0.0);

 glPolygonMode(GL_FRONT,GL_LINE);//多边形的前面仅显示它的边

 glLineWidth(4.0);//为了看着方便，可以设置一定线宽
    glBegin(GL_TRIANGLES);

 glVertex2i(50,50);

 glEdgeFlag(GL_FALSE);

 glVertex2i(150,50);

 glEdgeFlag(GL_TRUE);

 glVertex2i(75,150);

 glEnd();
 glFlush ();

 }

 void myinit (void)

 {

 glClearColor (0.0, 0.0, 0.0, 1.0);

 glMatrixMode (GL_PROJECTION);       // Set projection parameters.

 gluOrtho2D (0.0, 400.0, 0.0, 150.0);

 //glShadeModel (GL_FLAT);

 }

 

 int main(int argc, char** argv)

 {

 glutInitDisplayMode(GLUT_SINGLE | GLUT_RGBA);

 glutInit (&argc, argv);

 //glutInitPosition

 glutInitWindowPosition(0, 0);

 glutInitWindowSize (450, 350);     

 glutCreateWindow ("An Example OpenGL Program");

 //glutInitWindow (argv[0]);

 myinit();

 glutDisplayFunc(display);

 glutMainLoop();

 }