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Index › Programming Questions & Help › Programs › basic pixel copy
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basic pixel copy (Read 460 times)
anachronik
basic pixel copy
Nov 24th, 2007, 4:38pm  
Hi,

I'm actually stuck with a simple thing but i'm not into the good context to get it working. I've actually 100 images generated randomly by a sketch.

I've stored them in a array of PImage's and load each image pixels in memory.  

I want to get each lines' pixels of each images and copy them into the final image.

So the first line of image 1 will be the first line of the final image, the second line of image 2 will be the second line of the final image and the like until the widht of the final image.

Here's my try so far but my loop algorithm isn't good.

Quote:


PImage[] images = new PImage[100];
PImage output = createImage(300, 100, ARGB);

size(300, 100);
background(0);

//load all the images (from 0001 to 0100) in the images array
for (int i=0; i<=99; i++){
 if (i<9)
 {
   images[i] = loadImage("pattern-000"+ (i+1) +".png");
   println("pattern-000"+ (i+1) +".png");
 }
 else if (i <99)
 {
   images[i] = loadImage("pattern-00"+ (i+1) +".png");
   println("pattern-00"+ (i+1) +".png");
 }
 else if (i == 99) {
   images[i] = loadImage("pattern-0"+ (i+1) +".png");
   println("pattern-0"+ (i+1) +".png");
 }

 images[i].loadPixels(); //load all images pixels in memory.

 
 for (int j=0; j< (width-1); j++){
   for (int k=1; k<height; k++){
    output.pixels[j*k] = images[i].pixels[j*k];
   }
 }

 /*
   for (int k=0; k<width; k++){
  for (int j=0; j<100 ;j++){
  output.pixels[j] = images[i].pixels[k];
  //translate(0, j);
  //output.pixels[j] = images[i].pixels[j];  
  }
  }
  */
}

image(output, 0, 0);



I'm sorry, i know that's very simple, but sometimes my brain seems like not working anymore.

Regards.
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anachronik
Re: basic pixel copy
Reply #1 - Nov 24th, 2007, 7:00pm  
Here's a better version of the code for filling the output PImage pixel array with the correct loop i think. But actually only the last image pixel are get and set.

Quote:


PImage[] images = new PImage[100];
PImage output = createImage(300, 100, ARGB);

size(300, 100);
background(0);

//load all the images (from 0001 to 0100) in the images array
for (int i=0; i<=99; i++){
 if (i<9)
 {
   images[i] = loadImage("pattern-000"+ (i+1) +".png");
   println("pattern-000"+ (i+1) +".png");
 }
 else if (i <99)
 {
   images[i] = loadImage("pattern-00"+ (i+1) +".png");
   println("pattern-00"+ (i+1) +".png");
 }
 else if (i == 99)
 {
   images[i] = loadImage("pattern-0"+ (i+1) +".png");
   println("pattern-0"+ (i+1) +".png");
 }

 //this loop fill the output.pixel array well but only with the
 //last image pixels.
 for (int j=0; j<height; j++){
   for (int l=0; l<width; l++){
     output.pixels[l+(width*j)]= images[i].pixels[l];
   }
 }
}

image(output, 0, 0);
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fry
Re: basic pixel copy
Reply #2 - Nov 25th, 2007, 2:10pm  
you can also use the nf() function to simplify that a lot, it will pad the frame numbers with zeroes.
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WWW  
anachronik
Re: basic pixel copy
Reply #3 - Nov 26th, 2007, 9:49am  
Thx a lot fry,

It's really a lot easier right now.

I'm still stuck trying to do the good pixel copy e.g copy one row of 100 images from 0 to 99 to the final PImage.

I'm just wondering why does the code can access the images pixel array withouth calling loadPixels before ?

Here's my last try:

Quote:

PImage[] images = new PImage[100];
PImage output = createImage(300, 100, ARGB);
String filename;

void setup(){
 size(300, 100);
 background(0);
 frameRate(24);
 for (int i=0; i<=99; i++){
   filename = "pattern-"+ nf((i+1), 4)+".png";
   println(filename);
   images[i] = loadImage(filename);
 }
}

void draw(){
 for (int j=0; j<height; j++){
   for (int l=0; l<width; l++){
     //images[j].loadPixels();
     output.pixels[l+(width*j)]= images[j].pixels[(height*j)+l];
   }
 }
 image(output, 0, 0);
}


Regards
a.
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