sketch_christmas_screensaver

sketch_christmas_screensaver.java

import processing.core.PApplet;
import processing.core.PImage;
import java.awt.*;

PImage orig;
int scaledown = 1; //only used for huge pictures
int effectScale = 2;
float gravity = 0.5f; //values from 0 to 1
int screenWidth = 1920;
int screenHeight = 1080;

public void settings()
{
    orig = screenshot();
    //orig = loadImage("C:\\Projects\\Sand\\OyL9Ipc.jpg"); // remember to set the scaledown if uncommented
    if(orig.width == screenWidth && orig.height == screenHeight){
        fullScreen();
        scaledown = 1;
    }else{
        size(orig.width/ scaledown, orig.height/ scaledown);
    }
}

public void setup(){
    image(orig, 0, 0,orig.width/scaledown, orig.height/scaledown);
}

public void draw()
{
    loadPixels();
    modifyPixels();
    updatePixels();
    checkInput();
}

private void modifyPixels(){
    for(int x = 0; x < width/effectScale; x++) {
        for (int y = 0; y < height/effectScale; y++) {
            //for each virtual square on my screen with side length "pixelSize"
            if(coinFlip()){
                for(int xoff = 0; xoff < effectScale; xoff++){
                    for(int yoff = 0; yoff < effectScale; yoff++){
                        shiftUpwards(x*effectScale+xoff, y*effectScale+yoff);
                    }
                }
            }else{
                for(int xoff = 0; xoff < effectScale; xoff++){
                    for(int yoff = 0; yoff < effectScale; yoff++){
                        shiftLeft(x*effectScale+xoff, y*effectScale+yoff);
                    }
                }
            }
        }
    }
}

private void shiftUpwards(int x, int y){
    if(getPixel(x, y) > getPixel(x+1, y)){
        swapPixels(x, y, x, y+1);
    }
}

private void shiftLeft(int x, int y){
    if(getPixel(x, y) > getPixel(x, y+1)){
        swapPixels(x, y, x+1, y);
    }
}

private boolean coinFlip(){
    return random(1)<gravity;
}

private int getPixel(int x, int y){
    int index = x + y * width;
    if(index < pixels.length){
        return pixels[index];
    }
    return color(0);
}

private void setPixel(int x, int y, int clr){
    int index = x + y * width;
    if(index < pixels.length && index > 0){
        pixels[x + y * width] = clr;
    }
}

private void swapPixels(int x0, int y0, int x1, int y1){
    //boundary check
    if(x0 < width && x0 > 0 && y0 < height && y0 > 0
            && x1 < width && x1 > 0 && y1 < height && y1 > 0){
        int a = getPixel(x0, y0);
        int b = getPixel(x1, y1);
        setPixel(x0, y0, b);
        setPixel(x1, y1, a);
    }
}

private PImage screenshot() {
    PImage screenshot = null;
    try {
        screenshot = new PImage(new Robot().createScreenCapture(
                new Rectangle(0, 0, displayWidth, displayHeight)));
    } catch (AWTException e) {
        e.printStackTrace();
    }
    return screenshot;
}

public void checkInput(){
    frame.requestFocus();
    if(keyPressed){
        exit();
    }
    gravity = map(mouseX,0, width, 0.01f, .99f);
    //pixelSize = round(map(mouseY, 0, height, 2, 6));
}