【OpenGL 学习笔记03】点画多边形

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1.点画多边形

//定义填充多边形的点画模式。mask为32 x 32 的位图指针，1画0不画，使用前必须启用多边形点画功能void glPloygonStipple(const GLubyte* mask);//绘制一个矩形void glRectf(GLfloat x1,GLfloat y1,GLfloat x2,GLfloat y2);

2.示例

#include <GL/glut.h>#include <stdlib.h>void display(void){GLubyte fly[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x03, 0x80, 0x01, 0xC0, 0x06, 0xC0, 0x03, 0x60, 0x04, 0x60, 0x06, 0x20, 0x04, 0x30, 0x0C, 0x20, 0x04, 0x18, 0x18, 0x20, 0x04, 0x0C, 0x30, 0x20,0x04, 0x06, 0x60, 0x20, 0x44, 0x03, 0xC0, 0x22, 0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22,0x44, 0x01, 0x80, 0x22, 0x44, 0x01, 0x80, 0x22, 0x66, 0x01, 0x80, 0x66, 0x33, 0x01, 0x80, 0xCC, 0x19, 0x81, 0x81, 0x98, 0x0C, 0xC1, 0x83, 0x30,0x07, 0xe1, 0x87, 0xe0, 0x03, 0x3f, 0xfc, 0xc0, 0x03, 0x31, 0x8c, 0xc0, 0x03, 0x33, 0xcc, 0xc0, 0x06, 0x64, 0x26, 0x60, 0x0c, 0xcc, 0x33, 0x30,0x18, 0xcc, 0x33, 0x18, 0x10, 0xc4, 0x23, 0x08, 0x10, 0x63, 0xC6, 0x08, 0x10, 0x30, 0x0c, 0x08, 0x10, 0x18, 0x18, 0x08, 0x10, 0x00, 0x00, 0x08};GLubyte halftone[] = {0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55};glClear (GL_COLOR_BUFFER_BIT);glColor3f (1.0, 1.0, 1.0);//白色//矩形1glRectf (25.0, 25.0, 125.0, 125.0);//绘制矩形//矩形2glEnable (GL_POLYGON_STIPPLE);//开启多边形点画功能glPolygonStipple (fly);//定义点画模式填充内容glRectf (125.0, 25.0, 225.0, 125.0);//绘制矩形//矩形3glPolygonStipple (halftone);glRectf (225.0, 25.0, 325.0, 125.0);glDisable (GL_POLYGON_STIPPLE);//关闭多边形点画功能glFlush ();}void init (void) {glClearColor (0.0, 0.0, 0.0, 0.0);glShadeModel (GL_FLAT);    //采用恒定着色模式，使用图元中某个顶点的颜色来渲染整个图元。  }void reshape (int w, int h){glViewport (0, 0, (GLsizei) w, (GLsizei) h);glMatrixMode (GL_PROJECTION); //将当前矩阵指定为投影矩阵  glLoadIdentity (); //把当前矩阵设为单位矩阵  gluOrtho2D (0.0, (GLdouble) w, 0.0, (GLdouble) h);}void keyboard(unsigned char key, int x, int y){switch (key) {case 27:exit(0);break;}}int main(int argc, char** argv){glutInit(&argc, argv);glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);glutInitWindowSize (350, 150);glutCreateWindow (argv[0]);init ();glutDisplayFunc(display);glutReshapeFunc(reshape);glutKeyboardFunc (keyboard);glutMainLoop();return 0;  }

3.效果图

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