mouse clicked

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C#

How could I now If I clicked the lines that I drawn? Are lines can be distinguish as objects? :confused:

Posted 24-Jan-11 21:11pm

yummy02

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OriginalGriff · Accepted Answer · 2011-01-24T21:15:00

I assume you drew the lines using Graphics.DrawLine?
If so, then no, they are not separate objects, and you cannot click them.

If you need to, then you need to maintain a list of where they start and end - presumably you do this anyway so that you can re-draw them each time in the Paint event, otherwise they will disappear.

You can then check if where you clicked is on the line in your form or panel event.

Be aware though, it is only simple to do if the line is horizontal or vertical: if it slopes, you will have to work out exactly how it is drawn to be sure if a click on on or off a particular line!

What are you trying to do: there may be an easier way to achieve it.

Sergey Alexandrovich Kryukov · Accepted Answer · 2011-01-24T21:53:00

This is not very easy. This problem is solved in WPF which I already recommended to switch to. You progress in System.Windows.Forms gets slower as your problem accumulate.

A problem of like click test is one of them. You mouse click event fires when you click, but you need ignore it if no object is clicked. In case of line (thin object) it's important to define an area around a line which is considered its vicinity. It should be something wider then 1 pixel, otherwise the user will almost never hit it. If you're talking a straight line segment, you may need a rectangular area that covers your line. The definition of required width of vicinity (usually definitions works with "radius") is a matter of trade-of between resolution and ease of access. Having it variable (depending on scale) or configurable (or both) makes sense.

mouse clicked

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