计算机图形学裁剪伪代码

#define LEFT_EDGE 0x1

#define RIGHT_EDGE 0x2

#define BOTTOM_EDGE 0x4

#define TOP_EDGE 0x8

#define INSIDE(a) (!a)

#define REJECT(a,b) (a&b)

#define ACCEPT(a,b) (!(a|b))

#define FALSE 0

unsigned char encode(struct point2d pt,struct point2d winMin,struct point2d winMax)

{

unsigned char code=0x00;

if(pt.x<winMin.x)

code = code | LEFT_EDGE;

if(pt.x>winMax.x)

code = code | RIGHT_EDGE;

if(pt.y<winMin.y)

code = code | BOTTOM_EDGE;

if(pt.y>winMax.y)

tmp=*p1;

*p1=*p2;

*p2=tmp;

}

void swapCodes(unsigned char *c1,unsigned char * c2)

{

unsigned char tmp;