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  Generating random shapes  (Read 2045 times)
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Offline appel

JGO Wizard


Medals: 49
Projects: 5


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« Posted 2005-12-19 03:52:48 »

Hello,

I'm trying to make a game for the 4k competition, and what I want to do is to generate a random shape object that I can then fill with whatever.

I do have some java classes that can generate a random shape, but they are all huge. Is there any way of generating a random shaped object with a very few lines of code?

The shape needs to be pretty smooth, and edges curved.

Example (what I did in photoshop):

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Offline swpalmer

JGO Coder




Where's the Kaboom?


« Reply #1 - Posted 2005-12-19 04:04:36 »

The first thing that comes to mind is to use polar coordinates to sweep around a circle in 3--10 steps but vary the radius by a random amount.  Use a GeneralPath and "curveTo" to get it smoothed out.

Offline appel

JGO Wizard


Medals: 49
Projects: 5


I always win!


« Reply #2 - Posted 2005-12-19 04:12:36 »

Ahh....sounds like a good idea.

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Offline Ask_Hjorth_Larsen

Junior Member




Java games rock!


« Reply #3 - Posted 2005-12-20 02:13:04 »

You can generate quite nice results automatically by simply plotting a fourier series over its entire period, i.e.

1  
2  
3  
4  
5  
6  
7  
                 N
               -----
                \    /r1(n) cos(n t)   r2(n) sin(n t)\
                 )   |-------------- + --------------|
                /    |          2                2   |
               ----- \   (n + 1)          (n + 1)    /
               n = 0


plotted from t = 0..2 pi in polar coordinates.

The (n+1)^2 in the denominators have been selected to increase the smoothness of the graph (so violently oscillating terms have small impact).
Offline Ask_Hjorth_Larsen

Junior Member




Java games rock!


« Reply #4 - Posted 2005-12-20 02:18:02 »

Oh, the r1(n) and r2(n) are meant to be random numbers between 0 and 1.
Offline appel

JGO Wizard


Medals: 49
Projects: 5


I always win!


« Reply #5 - Posted 2005-12-20 09:41:37 »

Thank you, that will come in handy Smiley

Check out the 4K competition @ www.java4k.com
Check out GAMADU (my own site) @ http://gamadu.com/
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