OPENGL—中点Bresenham画直线

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//中点Bresenham画直线#include "stdafx.h"#include <gl/glut.h>#include <cmath>void init(void)    {     glClearColor(1.0,1.0,1.0,1.0);    //设置背景颜色为白色         glMatrixMode(GL_PROJECTION);       //对投影相关进行操作      gluOrtho2D(0.0, 30.0, 0.0, 30.0); } void putpixel(int x, int y){    glColor3f(1.0, 0.0, 0.0);          glPointSize(2.0f);    glBegin(GL_POINTS);        glVertex2f(15+x, 15+y);    glEnd();    glFlush();}void MidBresenhamLine(int x0,int y0,int x1,int y1){int dx,dy,d,UpIncre,DownIncre,x,y;if(x0>x1){x=x1;x1=x0;x0=x;y=y1;y1=y0;y0=y;}x=x0;y=y0;dx=x1-x0;dy=y1-y0;d=dx-2*dy;UpIncre=2*dx-2*dy;DownIncre=-2*dy;while(x<=x1){putpixel(x,y);x++;if(d<0){y++;d+=UpIncre;}elsed+=DownIncre;}}void display() {     glClear(GL_COLOR_BUFFER_BIT);            MidBresenhamLine(0,0,8,6);     }  int main(int argc,char** argv) {     glutInit(&argc,argv);     glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);       glutInitWindowSize(400,400);        glutInitWindowPosition(0,0);         glutCreateWindow("中点Bresenham画直线");        glutDisplayFunc(display);         init();            glutMainLoop();         return 0; }

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