EasyX图形随机移动实践_easyx实现平滑移动图像

有一小球在一矩形框内的任意位置，初始时以随机角度，随机速度往下掉落，每次碰到边框时以随机角度，随机速度继续运行，按ESC键结束。编写程序模拟小球的运动过程。

#include <conio.h>//要用到_kbhit()函数
#include <time.h>//要用到随机数
#include <graphics.h>
int get_randx();//实现随机出现
int get_randy();
int get_kx();//1~6随机取一个
int get_ky();
int main()
{
	initgraph(800, 800);
	setbkcolor(RGB(150, 150, 90));
	cleardevice();
	int x = get_randx();
	int y = get_randy();
	int kx = get_kx();
	int ky = get_ky();
	while (!(_kbhit() && _getch() == 27))
	{
		if ((x + kx + 20) >= 800)//四个边界检测，若达到边界，进行回弹并赋予随机速度
		{
			kx = -(get_kx());
			x += kx;
		}
		else if ((x + kx - 20) <= 0)
		{
			kx = get_kx();
			x += kx;
		}
		if (y + ky + 20 >= 800)
		{
			ky = -(get_ky());
			y += ky;
		}
		else if ((y + ky - 20) <= 0)
		{
			ky = get_ky();
			y += ky;
		}
		setcolor(RGB(50, 80, 80));//图像刷新
		setfillcolor(RGB(50, 80, 80));
		fillcircle(x, y, 20);
		Sleep(20);
		setcolor(RGB(150, 150, 90));
		setfillcolor(RGB(150, 150, 90));
		fillcircle(x, y, 20);
		x += kx;
		y += ky;
	}
	closegraph();
	return 0;
}
int get_randx()
{
	srand((unsigned)time(NULL) * (unsigned)rand());
	return rand() % 800;
}
int get_randy()
{
	srand((unsigned)time(NULL) + (unsigned)rand());
	return rand() % 800;
}
int get_kx()
{
	srand((unsigned)time(NULL) + (unsigned)rand());
	int k = rand() % 6;
	while (k == 0)
		k = rand() % 6;
	return k;
}
int get_ky()
{
	srand((unsigned)time(NULL) + (unsigned)rand());
	int k = rand() % 6;
	while (k == 0)
		k = rand() % 6;
	return k;
}

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