mirror of
https://github.com/processing/processing4.git
synced 2026-01-30 03:41:15 +01:00
53 lines
1.5 KiB
Plaintext
53 lines
1.5 KiB
Plaintext
/**
|
|
* Brightness
|
|
* by Daniel Shiffman.
|
|
*
|
|
* This program adjusts the brightness of a part of the image by
|
|
* calculating the distance of each pixel to the mouse.
|
|
*/
|
|
|
|
// The next line is needed if running in JavaScript Mode with Processing.js
|
|
/* @pjs preload="moon-wide.jpg"; */
|
|
|
|
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();
|
|
}
|