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screenGrab (Read 886 times)
ecocode
screenGrab
Dec 10th, 2005, 10:52pm  
Hi

I'd like to take a snapshot of the current output in a PImage instance . Is this possible ?
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st33d
Re: screenGrab
Reply #1 - Dec 11th, 2005, 12:24am  
Ah, now I've asked this question before. One of the properties in processing they don't tell you about is "g", the image of the applet.
Code:

void setup(){
  rect(0,0,10,10);
  loadPixels();
  PImage screenGrab = g.get();
  for(int i = 0; i < 10; i++)
    image(screenGrab, i*2, i*2);
}
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ecocode
Re: screenGrab
Reply #2 - Dec 11th, 2005, 1:12am  
thank you,

this works !
but there's a but...
once I issue the g.get() , my app forgets my Camera ...

If I comment g.get() out , the app works Sad

any idea ?
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ecocode
Re: screenGrab
Reply #3 - Dec 11th, 2005, 1:49am  
any idea where I can find the definition (class) of the var g ?
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fry
Re: screenGrab
Reply #4 - Dec 11th, 2005, 2:58am  
PImage screen = get();
will do the same thing. no need to use g.get(). most calls to g.whatever are already handled so that you shouldn't have to use g dot anything.
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ecocode
Re: screenGrab
Reply #5 - Dec 11th, 2005, 3:21pm  
I have a bug in my app using CaptureEvent. It only appears if I issue loadPixels() in the draw() function. Is there anything that could make loadPixels interfere with a camera ? It might help me if I can read the source of loadPixels(). Is it available somewhere ?

thanks
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st33d
Re: screenGrab
Reply #6 - Dec 11th, 2005, 11:32pm  
Would you mind reducing your code to what reproduces the bug and posting it so we can all have a crack at it?
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seltar
Re: screenGrab
Reply #7 - Dec 12th, 2005, 10:26am  
Here's the source for PGraphics2 where loadPixels is:
http://dev.processing.org/source/index.cgi/trunk/processing/core/PGraphics2.java?view=markup

Code:

  public void loadPixels() {
    if ((pixels == null) || (pixels.length != width * height)) {
	pixels = new int[width * height];
    }
    ((BufferedImage) image).getRGB(0, 0, width, height, pixels, 0, width);
  }


Doesn't seem to do much harm..

-seltar
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