060.txt

经典C语言程序设计事例,是一本初学者的C语言程序设计书籍。

060
    题目：画图，综合例子(2)。

程序源代码：
#include "graphics.h"
#define LEFT 0
#define TOP 0
#define RIGHT 639
#define BOTTOM 479
#define LINES 400
#define MAXCOLOR 15
main()
{
int driver,mode,error;
int x1,y1;
int x2,y2;
int dx1,dy1,dx2,dy2,i=1;
int count=0;
int color=0;
driver=VGA;
mode=VGAHI;
initgraph(&driver,&mode,"");
x1=x2=y1=y2=10;
dx1=dy1=2;
dx2=dy2=3;
while(!kbhit())
{
　line(x1,y1,x2,y2);
　x1+=dx1;y1+=dy1;
　x2+=dx2;y2+dy2;
　if(x1<=LEFT||x1>=RIGHT)
　dx1=-dx1;
　if(y1<=TOP||y1>=BOTTOM)
　　dy1=-dy1;
　if(x2<=LEFT||x2>=RIGHT)
　　dx2=-dx2;
　if(y2<=TOP||y2>=BOTTOM)
　　dy2=-dy2;
　if(++count>LINES)
　{
　　setcolor(color);
　　color=(color>=MAXCOLOR)?0:++color;
　}
}
closegraph();
}