Chapter 15: Example 15-5: Setting Pixels

// Learning Processing
// Daniel Shiffman
// http://www.learningprocessing.com

// Example 15-5: Setting pixels

size(200,200);

// Before we deal with pixels
loadPixels();

// Loop through every pixel
for (int i = 0; i < pixels.length; i++ ) { // We can get the length of the pixels array just like with any array.
  
  // Pick a random number, 0 to 255
  float rand = random(255);
  
  // Create a grayscale color based on random number
  color c = color(rand);
  
  // Set pixel at that location to random color
  pixels[i] = c; // We can access individual elements of the pixels array via an index, just like with any other array.
}

// When we are finished dealing with pixels
updatePixels();