如何检测图片框在一行上的拖放? [英] How to detect picturebox drag drop on a line?

问题描述

我画了一条线，想检测是否在其上放置了任何图片框.

I have a line drawn and want to detect if any picturebox is being placed on it.

推荐答案

如果我错了，有人可以纠正我，但是我想这会变得很复杂.

首先，我假设您正在Visual Basic PowerPack中使用LineShape? (是的，我知道这是C#吗?)

即使您不是以编程方式在窗体上画一条线，您也将不得不使用窗体的拖动事件或绘制该窗体的容器.

假设您已经拖动了PictureBox，请首先钩住Form的DragEnter和DragOver事件，然后在该代码中，首先检查是否存在PictureBox.

Someone can correct me if I''m wrong, but it''s going to be complicated, I think.

First, I assume you''re using the LineShape from within the Visual Basic PowerPacks? (and yes, I know this is a C# ?)

Even if you''re not and just drawing a line on the form programmatically, you''re going to have to use either the form''s drag events, or the container that it is drawn on.

Assuming you already have a PictureBox being dragged, first hook the Form''s DragEnter and DragOver events and in that code, first, check if there is a PictureBox present

if (e.Data.GetDataPresent(typeof(PictureBox))

那么您必须检查它是否在线路上.如果它是VB PowerPack中的LineShape，则可以执行HitTest

then you have to check if it''s over the line. If it''s a LineShape from the VB PowerPacks, you can do a HitTest

if (lineShape1.HitTest(e.x,e.y))

然后，将e.Effect设置为想要的效果.然后，您在表单中处理DragDrop并将PictureBox添加到DragDrop发生的那一行.

Then, you set e.Effect to what effect you want. Then, you handle the DragDrop in the form and add the PictureBox to the line that the DragDrop happened over.

要添加到其他答案中，如果您''如果要重新做这么复杂的事情，如果抛开图片框并在绘画事件中绘制图片，它将变得更加容易(但仍然很复杂).这样可以使您对发生的事情有更多的控制.

To add to the other answer, if you''re going to do something this complex, it becomes a lot easier ( but still complex ) if you ditch the picturebox and just draw the picture in your paint event. This gives you a lot more control over what is going on.

如何进行线路测试?您能给我一些代码吗?

How can i do a line test? Could you provide me with some codes?

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