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let red = 0;let blue = 0;let green = 0;let value;let size = 5;function setup() { createCanvas(windowWidth, windowHeight); background(0);}function draw() { // change colors if (keyIsDown(SHIFT)) { value = (1536 / windowWidth) * mouseX; if (value <= 512) { change_color(value); } else if (value <= 1024) { change_color2(value); } else { change_color3(value); } } // rectangle that shows what color is picked fill(red, green, blue); rect(0, windowHeight - windowHeight / 15, windowWidth, windowHeight / 15); textSize(32); fill(100); text(size, windowWidth / 2, windowHeight - windowHeight / 50);}function keyPressed() { if (keyCode == UP_ARROW) { if (size <= 10) { size++; } } else if (keyCode == DOWN_ARROW) { if (size > 1) { size--; } }}function change_color(value) { if (value <= 256) { red = value; green = 0; blue = 0; } else { red = 256; green = value - 256; blue = 0; }}function change_color2(value) { if (512 < value <= 768) { red = 768 - value; green = 256; blue = 0; } else { red = 0; green = 256; blue = -512 + value; }}function change_color3(value) { if (value <= 1280) { red = 0; green = 1280 - value; blue = 256; } else { red = -1280 + value; green = -1280 + value; blue = 256; }}function mouseClicked() { fill(red, green, blue); star_cluster(mouseX, mouseY, red, green, blue);}function star_cluster(x, y, red, green, blue) { let switch_sign = 1; let switch_sign2 = -1; for (let i = 0; i < 800 * random(); i++) { for (let j = 0; j < 800 * random(); j++) { noStroke(); fill(red, green, blue, 400 * random()); circle( x + switch_sign * (i * 2) * random(), y + switch_sign2 * (j * 2) * random(), size * random() ); } if (switch_sign == 1 && switch_sign2 == -1) { switch_sign2 = 1; } else if (switch_sign == 1 && switch_sign2 == 1) { switch_sign = -1; } else if (switch_sign == -1 && switch_sign2 == 1) { switch_sign2 = -1; } else if (switch_sign == -1 && switch_sign2 == -1) { switch_sign = 1; } }}