OpenGl中DDA算法画直线

void DDALine(int x0,int y0,int x1,int y1){int dx,dy,epsl,k;float x,y,xIncre,yIncre;dx = x1 - x0;dy = y1 - y0;x = x0;y = y0;if(abs(dx)>abs(dy))epsl=abs(dx);elseepsl=abs(dy);xIncre=(float)dx/(float)epsl;yIncre=(float)dy/(float)epsl;glPointSize(2);glBegin(GL_POINTS);for(k = 0;k <= epsl; k++){glColor3f(1.0f, 0.0f, 0.0f);glVertex2f(int(x+0.5),int(y+0.5));x += xIncre;y += yIncre;}glEnd();}