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Index › Programming Questions & Help › Syntax Questions › How to store drawing data
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How to store drawing data (Read 1049 times)
ssdesign
How to store drawing data
Dec 17th, 2008, 8:51am  
Hi,
I have a class that is repeatedly called to create dots on the screen which gradually build up to make nice patterns or drawing on the screen.

Now, I would like to store all of these steps to replay them later so that I can use a "for" loop inside draw function to create print size images (using the image tileSaver code from Unlekker).

My question is, how can I save all of this data (in buffer?) to be played later? When I do a trace of the number of loops my drawing needs to go through before something nice appears on screen is more then 3000000 loops.

Secondly I am also interested to learn how to empty an Array?

Thanks for any help.
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PhiLho 
Re: How to store drawing data
Reply #1 - Dec 17th, 2008, 1:36pm  
First part: I don't understand the problem. Is the drawing done with user interaction? If not, just run the sketch again. If so, just record user actions.

Second part: you can loop on the array, or use Arrays.fill(yourArray, 0);
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ssdesign
Re: How to store drawing data
Reply #2 - Dec 18th, 2008, 9:52am  
Hi,
I am trying to export a hi-res image using processing.

My sketch is using a class to drag recursive dots on the screen and hence in the end create some graphics.

To save this later, I am trying to use the unlekker tileSaver code (found here):
http://workshop.evolutionzone.com/2007/03/24/code-tilesaverpde/

Now the problem is, tileSaver code needs to run within the draw() function. Whereas I am drawing things outside of the draw function.

Thats why I was trying to find a way to store everything I do outside the draw() function and store it in memory and later on key press call the stored values inside draw() and repeat the steps to recreate hi-res image.

I would be interested to know if there is any other way to create hi-res images using processing.

Thanks and regards
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seltar
Re: How to store drawing data
Reply #3 - Dec 18th, 2008, 12:52pm  
you can use the draw function, even though the graphics are drawn somewhere else.

just put the tiler.pre(); in the beginning of the draw
and tiler.post(); at the end of draw.

-seltar
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ssdesign
Re: How to store drawing data
Reply #4 - Dec 19th, 2008, 7:27am  
Thanks,it kind of works now but with a small issue.

I can export large image but the large image consists of tile of small images instead of one large image.

btw. I am using P3D and not OPENGL.

When I change P3D to OPENGL in my code, the screen just keeps flickering with garbage .... any idea how to solve this?

Thanks again.
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ssdesign
Re: How to store drawing data
Reply #5 - Jan 16th, 2009, 3:23pm  
hi,
still struggling with this one.

now i have two questions instead.
first one is still about exporting hi-resolution images from processing.
So when I use tilesaver, I understand that the draw() function has to have a background() call. If I keep drawing without calling the background, the tilesaver does not work Sad

Secondly, it only works with opengl, so i would really love to use opengl for all my sketches instead of P3D, but when I run the code using opengl, the sketch plays in a weired manner. (I am on windows machine with Vista home edition).

Any suggestions?
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