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Index › Programming Questions & Help › Programs › redrawing background
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redrawing background (Read 724 times)
gregniemeyer
redrawing background
Apr 19th, 2007, 7:42am  
Hello, Folks,

I am looking for some help with replacing the background image with a blurred version of the last image rendered.

void draw(){
 last = //what just was rendered, but made blurry
 tint(0, 153, 204);
 background(last);
 //move objects
}

so I can have better control over trails of moving objects.

Thanks for your help, Greg
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greglitpc
Re: redrawing background
Reply #1 - May 5th, 2007, 4:25am  
Here ya go:
Quote:

color last[], current[];

void setup() {
 loadPixels(); //Initialize the pixels array
 last = new color[pixels.length]; //Initialize the array for the last frame
 current = new color[pixels.length]; //Initialize the array for th current frame
}

void draw(){
 arraycopy(last,pixels); //Copy "last" array to pixels array
 updatePixels(); //Update pixels array
 //move objects
 loadPixels(); //Get the pixels array form current frame image
 arraycopy(pixels,current); //Copy pixels array to "current" array
 filter(BLUR, 1); //Apply blur filter
 arraycopy(pixels,last); //Copy the pixels array with blur filter to the "last" array
 arraycopy(current,pixels); //Copy "current" array (pixels array before the blur filter) back to the pixels array
 updatePixels(); //Update pixels arra
}  
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