计算机图形学实验C++代码11页.doc

一、 bresenham算法画直线#include #include #include void draw_pixel(int ix,int iy)glBegin(GL_POINTS);glVertex2i(ix,iy);glEnd();void Bresenham(int x1,int y1,int xEnd,int yEnd)int dx=abs(xEnd-x1),dy=abs(yEnd-y1);int p=2*dy-dx;int twoDy=2*dy,twoDyMinusDx=2*dy-2*dx;int x,y;if (x1xEnd)x=xEnd;y=yEnd;xEnd=x1;elsex=x1;y=y1;draw_pixel(x,y);while(xxEnd)x+;if(p0)p+=twoDy;else