问题描述
你好！
我想在屏幕上绘制图像，然后将其删除，但是有一个小问题.
我可以轻松地绘制它，但是随后要移除它时，我只是不知道该怎么做.
不，不仅仅是用背景颜色填充图像的位置，这不是那么容易.
我试图开发的程序是一个游戏，实际上是一条蛇.一条无尽的，所以我的蛇没有端点，只有一条正在旋转的头.
因此，当我绘制图像时，我希望程序在蛇下绘制它，所以我已经绘制的图像不应删除.
当蛇获得奖金(即图像)时，应通过重画顶部的图形将其从屏幕上移除.
图片:
http://imageshack.us/m/840/2449/nvtelenx.png [ ^ ]
Hello!
I would like to draw an image on the screen, and then remove it, but there''s a little problem.
I can easily draw it, but then when it comes to remove, I just don''t know how.
No, not simply filling the image''s location with the background color, it isn''t that easy.
The program I am trying to develop is a game, actually a snake. An endless one, so my snake doesn''t have an endpoint, just a head which is going.
So when I draw the image I want the program to draw it UNDER the snake, so which I have already draw should not be delete.
When a snake takes the bonus (which is the image), it should be removed from the screen by redrawing which was on the top of it.
A picture of it:
http://imageshack.us/m/840/2449/nvtelenx.png[^]
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