Brightness Pixels
/**
* Brightness Pixels
* by Daniel Shiffman.
*
* This program adjusts the brightness of a part of the image by
* calculating the distance of each pixel to the mouse.
*/
PImage* img;
void setup() {
size(640, 360);
frameRate(30);
img = loadImage("moon-wide.jpg");
img->loadPixels();
// Only need to load the pixels[] array once, because we're only
// manipulating pixels[] inside draw(), not drawing shapes.
loadPixels();
}
void draw() {
for (int x = 0; x < img->width; x++) {
for (int y = 0; y < img->height; y++) {
// Calculate the 1D location from a 2D grid
int loc = x + y * img->width;
// Get the R,G,B values from image
float r, g, b;
r = red(img->pixels[loc]);
//g = green(img->pixels[loc]);
//b = blue(img->pixels[loc]);
// Calculate an amount to change brightness based on proximity to the mouse
float maxdist = 50; //dist(0,0,width,height);
float d = dist(x, y, mouseX, mouseY);
float adjustbrightness = 255 * (maxdist - d) / maxdist;
r += adjustbrightness;
//g += adjustbrightness;
//b += adjustbrightness;
// Constrain RGB to make sure they are within 0-255 color range
r = constrain(r, 0, 255);
//g = constrain(g, 0, 255);
//b = constrain(b, 0, 255);
// Make a new color and set pixel in the window
//color c = color(r, g, b);
color c = color(r);
pixels[y * width + x] = c;
}
}
updatePixels();
}