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Index › Programming Questions & Help › Syntax Questions › rotated mask

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rotated mask (Read 546 times)

gabon

rotated mask
Dec 19^th, 2005, 8:39pm

Hi guys, which method do you suggest me to apply to a PImage as mask a rotated PImage? If it's not clear, you can check this picture: http://nuthinking.com/p5/rotated_mask.gif
where 2 could be eventually be the 1 rotated and 3 is the result when one is applied to the other after being rotated.

Do you suggest to use PGraphic? also because I don't see any other way.

Thanks a lot, chr

{Christian Giordano's site and blog}

Ricard

Re: rotated mask
Reply #1 - Dec 20^th, 2005, 8:46am

If you want to do this kind of things you might try out my library:

http://www.tecn.upf.es/master/mad04/~rmarxer/processing/geomerative/documentation/index.htm

Quite ALPHA yet, but it helps to have people's feedback.

So the way to do it with my library would be:

Code:


import geomerative.*;

RPolygon p, protated, pintersection;
RMatrix m;

int SMALLRAD = 10;
int LARGERAD = 100;

void setup(){
  size(300,300);
  background(0);
  framerate(24);
  
  p = new RPolygon();

  p.addPoint(-SMALLRAD,-LARGERAD);
  p.addPoint(SMALLRAD,-LARGERAD);
  p.addPoint(SMALLRAD,-SMALLRAD);
  p.addPoint(LARGERAD,-SMALLRAD);
  p.addPoint(LARGERAD,SMALLRAD);
  p.addPoint(SMALLRAD,SMALLRAD);
  p.addPoint(SMALLRAD,LARGERAD);
  p.addPoint(-SMALLRAD,LARGERAD);
  p.addPoint(-SMALLRAD,SMALLRAD);
  p.addPoint(-LARGERAD,SMALLRAD);
  p.addPoint(-LARGERAD,-SMALLRAD);
  p.addPoint(-SMALLRAD,-SMALLRAD);
  
  protated = new RPolygon(p);
  
  m = new RMatrix();
  m.rotate(PI/120);
}

void draw(){
  background(0);
  translate(width/2,height/2);
  stroke(255);
  fill(255);
  
  protated.transform(m);
  pintersection = p.intersection(protated);
  pintersection.draw(g);
}

Hope it helps!
For any questions or suggestions on the library just contact me.

gabon Full Member Offline Posts: 121	Re: rotated mask Reply #2 - Dec 20^th, 2005, 9:40am Thanks Richard, but how could I do it using bitmaps? cheers, chr
	{Christian Giordano's site and blog}

gabon Full Member Offline Posts: 121	Re: rotated mask Reply #3 - Dec 20^th, 2005, 4:06pm Toxi today helped me realizing it using PGraphic3. Here is the result: http://nuthinking.com/p5/masked_flake/ Now I've to test its performances with many instances but it seems a good starting point Thanks to everyone, chr
	{Christian Giordano's site and blog}

Ricard Full Member Offline Posts: 193	Re: rotated mask Reply #4 - Dec 20^th, 2005, 5:17pm Very nice!! Sorry I couldn't help. I didn't understand you were trying to use bitmaps as masks. The results are quite impressive, thinking on how simple the concept is.

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