Project 11: Winter Scroll

sketch

//Name: Hari Vardhan Sampath
//Section: E
//eMail address: harivars@andrew.cmu.edu
//Project-11

var snowForeground = []; // array of snow particles in the foreground
var snowBackground = []; // array of snow particles in the background
var snowAmountForeground = 500;
var snowAmountBackground = 750;
var snowSize = 3;
var snowLayers = 3;

function setup() {
    createCanvas(500, 300);

    for (i = 0; i < snowAmountForeground; i++) {
        snowForeground[i] = new Object();
        snowForeground[i].x = random(width);
        snowForeground[i].y = random(height);
        snowForeground[i].dy = random(0.25, 1);
        snowForeground[i].c = color(random(200, 255));
    }

    for (i = 0; i < snowAmountBackground; i++) {
        snowBackground[i] = new Object();
        snowBackground[i].x = random(width);
        snowBackground[i].y = random(height);
        snowBackground[i].dy = random(0.25, 1);
        snowBackground[i].c = color(random(200, 255));
    }
}

// update position and draw each of 100 rectangles
function draw() {
    // background sky gradient
    for (var i = 0; i < height; i++) {
        // 
        var c1 = color(0, 20, 52);
        var c2 = color(0, 71, 126);
        // 
        var gradient = map(i, 0, height, 0, 1);
        var c = lerpColor(c1, c2, gradient);
        stroke(c);
        line(0, i, width, i);
    }

    // snow falling in the background
    noStroke();
    for (i = 0; i < snowAmountBackground; i++) {
        drawSnowBackground(snowBackground[i]);
        updateSnowBackground(snowBackground[i]);
    }

    // layers of winter forest
    forest();

    // snow falling in the foreground
    noStroke();
    for (i = 0; i < snowAmountForeground; i++) {
        drawSnowForeground(snowForeground[i]);
        updateSnowForeground(snowForeground[i]);
    }
}

function forest() {
    foliage0 = 0.06;
    foliage1 = 0.04;
    foliage2 = 0.02;
    foliage3 = 0.01;
    foliageSpeed0 = 0.001;
    foliageSpeed1 = 0.002;
    foliageSpeed2 = 0.003;
    foliageSpeed3 = 0.004;

    stroke(163, 196, 217);
    beginShape();
    for (var i = 0; i < width; i++) {
        var t0 = (i * foliage0) + (millis() * foliageSpeed0);
        var y0 = map(noise(t0), 0, 1, 200, 5);
        line(i, y0, i, height);
    }
    endShape();

    stroke(117, 163, 191);
    beginShape();
    for (var i = 0; i < width; i++) {
        var t1 = (i * foliage1) + (millis() * foliageSpeed1);
        var y1 = map(noise(t1), 0, 1, 250, 6);
        line(i, y1, i, height);
    }
    endShape();

    stroke(70, 113, 140);
    beginShape();
    for (var i = 0; i < width; i++) {
        var t2 = (i * foliage2) + (millis() * foliageSpeed2);
        var y2 = map(noise(t2), 0, 1, 275, 7);
        line(i, y2, i, height);
    }
    endShape();

    stroke(30, 51, 64);
    beginShape();
    for (var i = 0; i < width; i++) {
        var t3 = (i * foliage3) + (millis() * foliageSpeed2);
        var y3 = map(noise(t3), 0, 1, 300, 8);
        line(i, y3, i, height);
    }
    endShape();
}

function drawSnowForeground(s) {
    fill(s.c);
    circle(s.x, s.y, 2);
}

function updateSnowForeground(s) {
        s.y += s.dy;
        if (s.y > height) {
        s.y = 0;
        }
        else if (s.y < 0) {
            s.y = height;       
        }
}

function drawSnowBackground(s) {
    fill(s.c);
    circle(s.x, s.y, random(0.5,1.5));
}

function updateSnowBackground(s) {
        s.y += s.dy;
        if (s.y > height) {
        s.y = 0;
        }
        else if (s.y < 0) {
            s.y = height;       
        }
}