EasyX实现反弹球

//利用EasyX反弹球
#include <graphics.h>  //引用EasyX图形库
#include <conio.h>
#define high 480
#define width 640

int main()
{
    float ball_x,ball_y;
    float ball_vx,ball_vy;
    float radius;
    
    initgraph(width,high);
    ball_x=width/2;
    ball_y=high/2;
    ball_vx=1;
    ball_vy=1;
    radius=20;
    while (1)
    {
        //绘制黑线、黑色的填充的圆
        setcolor(BLACK);
        setfillcolor(BLACK);
        fillcircle(ball_x,ball_y,radius);
        
        //更新小圆的坐标
        ball_x=ball_x+ball_vx;
        ball_y=ball_y+ball_vy;
        
        if((ball_x<=radius)||(ball_x>=width-radius))
            ball_vx=-ball_x;
        if((ball_y<=radius)||(ball_y>=high-radius))
            ball_y=-ball_y;
        setcolor(YELLOW);
        setfillcolor(GREEN);
        fillcircle(ball_x,ball_y,radius);
        sleep(30);
    }
    closegraph();
    return 0;
}