OpenGL的填充属性函数之线框图中消除选定边

来源：互联网发布：李克勤护花使者知乎编辑：程序博客网时间：2024/04/27 21:48

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();
}