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Bouncing Smiley Face

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5.0 | 4 ratings Rate this file 15 Downloads (last 30 days) File Size: 5.45 KB File ID: #23081
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Bouncing Smiley Face

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23 Feb 2009 (Updated )

Exaggerated and somewhat cartoonish simulation of the physics of a bouncing smiley face.

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Description

The laws for rotation are probably wrong (I made them up actually), but that's not what this file is about. Shown here is a very simple code that creates a nice animation, which can be quickly edited to suit anyone's needs.

The parameters are ball radius, gravity, initial velocity in the Y direction, initial velocity in the X direction, vertical speed conservation (%), horizontal speed conservation (%) and initial angular velocity.

Please note that the ball may stop moving at different locations for different trials, even with the same input parameters. This is due to the slight randomization of the deformations of the ball and the ground, which could lead to the ball getting "stuck" to the ground at times and stopping there. This is normal and deliberate.

Set the vertical speed conservation as a value larger than 100 (e.g. 130) for a small bonus ;)

Acknowledgements

Bouncing Ball Physics inspired this file.

MATLAB release MATLAB 7.4 (R2007a)
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Comments and Ratings (8)
07 Feb 2010 Amelia

Yes, great program Husam!

29 Apr 2009 David

Great program.

24 Mar 2009 NOUR  
25 Feb 2009 John D'Errico

The appropriate review would just be this.

8-)

25 Feb 2009 Husam Aldahiyat

Wow, too easy. Thanks.

24 Feb 2009 Kenneth Eaton

One solution to the dependence on the Image Processing Toolbox... you could plot a square surface object, then texture map the smiley-face image onto it. Then you can simply rotate the surface object yourself, without a need for the IPT.

24 Feb 2009 Husam Aldahiyat

Ah, sorry about that. Will send an update that brings notice to this. Also, you're to be mentioned as inspiration in the code. Forgot to include that in before.

As for getting around the problem, I don't think there's a simple way to do it, so anyone without the Image Processing Toolbox should comment out lines 278 and 282. The result is missing out on the smiley face bit altogether.

24 Feb 2009 John D'Errico

Looks very nice. I was disappointed that no mention was made of the requirements for use. NO image processing toolbox, no go.

??? Undefined function or method 'imrotate' for input arguments of type 'uint8'.

Error in ==> bb2>go at 282
iii=image(imrotate(uint8(flipud(am)),ll,'bilinear','crop'),'xdata',[ccc2-r/2,ccc2+r/2],'ydata',[ccc-r/2
ccc+r/2]);

??? Error while evaluating uicontrol Callback

Updates
23 Feb 2009

Fixed eccentricity error, horizontal conservation error.

25 Feb 2009

Code now works on systems without the Image Processing Toolbox.

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