OpenGl中点Bresenham算法画直线

void Mid_B(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;glPointSize(2);glBegin(GL_POINTS);while(x <= x1){glColor3f(1.0f, 0.0f, 0.0f);glVertex2f(x,y);x++;if(d < 0){y++;d += UpIncre;}elsed += DownIncre;}glEnd();}