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2D All the way! / Mathmatical Road block

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Takeshii
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Joined: 15th Feb 2004
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Posted: 9th Dec 2005 04:39
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What i need is to detect the x/y value of a click (i can do this part) but also detect if its iside the circumfrence (spelling?) of a circle.


Ive never delt with this kind of math in programming, and am not exactly sure of myself (tried). I know alot of math (up to trig and still going) but am not sure on how to apply it, in this case. Im sure its really obviouse hehe...

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Takeshii
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Posted: 9th Dec 2005 06:19
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OMG ...brainfart...too easy got it...thanks anyway

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D Ogre
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Posted: 23rd Dec 2005 03:34
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If I am understanding you correctly, you want to check the current mouse pointer position to see if it falls within a circle when you click the mouse button.

I don't think you need to apply trig. for the solution to your problem. Why not try replacing the mouse pointer and circle with a sprite version of each, and then check for collision between the two? This would be a simple solution. After all, you don't really want to complicate tasks such as this do you?
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Sven B
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Joined: 5th Jan 2005
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Posted: 25th Dec 2005 22:31
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A tip:

If you're using pythagoras' sqrt(diffx^2 + diffy^2), then I suggest you change it to vector math.
It's much faster using
r = make vector2(1)
set vector2 1,mousex() - 320, mousey() - 240
radius = length vector2(1)
(Only for DBP)
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