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Index › Programming Questions & Help › Syntax Questions › MouseClicked on Line (Vector)
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MouseClicked on Line (Vector)? (Read 499 times)
kklex05
MouseClicked on Line (Vector)?
Nov 25th, 2007, 3:02pm  
Hey,
On MouseClicked I want to know if I catches a line in an 3dimensional room. (to ease that up, we can take a 2dimensional room)
The line is drawn from a vector or a coordinate and the center of the room. Between this long line there is other point given.
Is there an (easy) way to calculate this?
I have about up to 100 lines so I don't want to overload my computer.
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kklex05
Re: MouseClicked on Line (Vector)?
Reply #1 - Nov 26th, 2007, 6:13pm  
What I have to do to get an answer? If you dont understand my question, please ask.
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JohnG
Re: MouseClicked on Line (Vector)?
Reply #2 - Nov 26th, 2007, 8:42pm  
Your question is a little vague, but one option is to do a dot-product of a normalisedvector from one point of the line and the mouse, and another normalised vector from the same point on the line to another point on the line.

If the mouse is on the line, the dot product should be 1 (or very close)
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kklex05
Re: MouseClicked on Line (Vector)?
Reply #3 - Nov 28th, 2007, 1:31pm  
Great tipp, thanks. It worked out. Smiley

But one problem is there: I have choised a perspective (translate(width/2, height/2, -wSize/3)) and the mouse position only gets the coordinates of the 'sketch-window' (dont know the name of it).
How can I handle this?
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kklex05
Re: MouseClicked on Line (Vector)?
Reply #4 - Nov 28th, 2007, 2:33pm  
Oh, I realized: there was no problem with the perspective Smiley

Thanks for your help.
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