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canvas{display: block;}


Birds - for Dress of Life
Vivian Wong
Professor Adam Tindale, Kate Hartman, Haru Ji
DIGF 2004 - Atelier I
Wednesday December 6, 2017

References: Wings by Michael Pin

let len = 110;    // variable len at 110 for length of wings
let t;            // variable t to control speed

function setup() {
  canvas = createCanvas(windowWidth, windowHeight);
  stroke(200);    // white stroke colour
  smooth();       // anti-aliased edges
  t = 0;          // initialize variable t at 0

function draw() {
  background(0);    // set background colour to black

  // push and pop each bird with specified parameters
  birdy(width/2, height + 220 - t/1.4, 1);
  birdy(width/2 + 20, height +400 - t, 1.5);
  birdy(width/2 - 20, height + 360 - t, 1.5);
  birdy(width/2 - 45, height + 550 - t*1.1, 2);
  birdy(width/2 + 45, height + 525 - t, 2);

  t += 2; // increment variable t by 2

// function to draw birds onto canvas, using variable w and h for translate parameters, and s for size parameters

function birdy(w, h, s) {
  translate(w, h);
  for (let q = 0; q < len; q += 1.99) {
    angle = cos(radians(len-q+frameCount*3)) * q;
    // set x and y positions for both wings according to angle
    // size of each wing is defined by q/s
    let x = sin(radians(-90-angle))*(q/s);
    let y = cos(radians(-90-angle))*(q/s);
    let x2 = cos(radians(-angle))*(q/s);
    let y2 = sin(radians(-angle))*(q/s);
    stroke(255);                  // white coloured stroke
    fill (50+q*2, 20+q, 30, 100); // orange-y brown fill colour
    // last two parameters of bezier function divided by 1.5 allows for overlay of orange fill colour
    // right wing
    bezier(-10, 0, x/2, y/2, x/2, y/2, x/1.5, y/1.5);
    // left wing
    bezier(10, 0, x2/2, y2/2, x2/2, y2/2, x2/1.5, y2/1.5);