如何在处理（Java）中使用像素 [] 放大显示？

Question

I love experimenting with operating on images pixel by pixel using pixels[] . However, I'd like to work on a matrix of 100x100 pixels but have the display be several times larger than 100x100 on my screen.

Is there an efficient and straightforward way to zoom, magnify, scale, resize, or etc… to allow me to work with pixels[] just… bigger?

I was disappointed to see that scale() doesn't work with pixel arrays.

My first idea to scale by a factor of S is by iterating through my pixel array and drawing a board of SxS rect s with the fill of each pixel's color val. However, this is computationally intensive, and I can't get my frameRate above 5 or so.

Answer 1

Ah great idea @sorifiend. Since I was calling loadPixels() immediately after setting the window size() and leaving it blank (rather than loading pixels from a image and putting it in the window,) I hadn't thought of that. I found you can use createImage() to make an empty image, which resizes crisply with noSmooth(); on! Thanks for the start.

Here's my code for posterity:

void setup() {
  i = createImage(100, 100, RGB);
  background(0);
  size(800, 800);
  i.loadPixels();
  noSmooth();

}

void draw() {
  i.loadPixels();
  for (int x = 0; x < i.width; x++) {
    for (int y = 0; y < i.height; y++) {
      if (random(0,max(i.width,i.height)) < y) {
        i.pixels[x + y*i.height] = color(255);
      } else {
        i.pixels[x + y*i.height] = color(0);
      }
    }
  }
  i.updatePixels();
  image(i,0,0,width,height);
}