移动图形对象 [英] Move a graphic object

问题描述

我已通过以下代码在form_paint中创建了图形对象:

I''ve created a graphic object in form_paint by this code :

Graphics gr = this.CreateGraphics();
gr.FillEllipse(Brushes.Yellow, 10, 30, 200, 150);

我该如何使该对象像控件(例如按钮)一样对待?；我的意思是用户可以在运行时在窗体上移动此椭圆.
:confused:
就像Powerpack工具一样，在创建对象时，也要移动它.
(请通过使用路径或区域来告诉我....)

how can I make this object to treat like a control(for example a button)?;I mean user be able to move this ellipse on the form at run time.
:confused:
like powerpacks tools ,when you create the object ,you move it.
(please tell me by using path or region .... )

推荐答案

如果您在Form.Paint事件中这样做(如您所愿)，那么您不应该使用this.CreateGraphics()-改用e.Graphics.

您将需要处理MouseDown(捕获移动开始)，MouseMove(移动椭圆)和MouseUp(移动结束).
在MouseDown中标记您正在移动中，在MouseUp中标记您不在移动中.
在MouseMove中，检查是否在移动，并存储鼠标指针的坐标.使用Invalidate()重绘椭圆.

If you are doing this in the Form.Paint event (as you should), then you should not use this.CreateGraphics() - use e.Graphics instead.

You will need to handle MouseDown (capture start of move) MouseMove (Move your ellipse) and MouseUp (End of move).
Mark that you are moving in a bool in MouseDown, mark you aren''t moving in MouseUp.
In MouseMove, check if you are moving, and store the coordinates of the mouse pointer. Use Invalidate() to redraw your ellipse.

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