![[OLD FALL 2019] 15-104 • Introduction to Computing for Creative Practice](../../../../wp-content/uploads/2020/08/stop-banner.png)
var star = []; // stores the star objects
var ufo = []; // stores UFO's
var moonY = 400; // where the moon surface is
function setup() {
createCanvas(480, 480);
// Pushes background stars on to array
for(i = 0; i < 20; i ++) {
star.push(makeStar());
}
}
function draw() {
noStroke();
background(0);
// Populates the background with stars of random location, size, and color
for(i = 0; i < star.length; i ++) {
var s = star[i];
s.draw();
}
// Draws sun in the top right
fill(255, 220, 70);
circle(410, 50, 60);
// Draws UFOs offscreen and has them travel left until they vanish
for(u = 0; u < ufo.length; u ++) {
var p = ufo[u];
p.draw();
p.move();
}
removeUFO(); // Removes UFOs when they get offscreen
addUFO(); // Keeps the remaining UFOs
// Draws the moon surface at the bottom of the canvas
fill(220);
rect(0, moonY, width, height - moonY);
fill(180);
ellipse(30, 460, 180, 40);
ellipse(300, 420, 220, 25);
}
// Returns the star object that gets pushed into the array
function makeStar() {
return {x: random(0, 410), y: random(moonY) - 20, size: random(10),
draw: drawStar, color: color(250, 200, random(255)) };
}
// Draws stars of random color, location, and size
function drawStar() {
fill(this.color);
circle(this.x, this.y, this.size);
}
// Returns the UFO object that gets pushed into the array
function makeUFO() {
return {x: width + 100, y: random(moonY), width: random(60, 130),
draw: drawUFO, color: color(random(255), random(255), random(255)),
speed: random(-2, -0.5), move: moveUFO};
}
// Draws UFOs of random color, width, location, and speed
function drawUFO() {
fill(this.color);
ellipse(this.x, this.y - 10, this.width / 2, 30);
fill(240);
ellipse(this.x, this.y, this.width, 20);
}
// This makes sure that the screen isnt flooded with 60 UFOs a second
function addUFO() {
// Small chance of adding a UFO
var newUFOChance = 0.007;
if (random(0, 1) < newUFOChance) {
ufo.push(makeUFO());
}
}
// Takes UFOs off the array when they go offscreen
function removeUFO() {
var ufoToKeep = [];
for(i = 0; i < ufo.length; i ++) {
if (ufo[i].x > 0 - ufo[i].width) {
ufoToKeep.push(ufo[i]);
}
}
ufo = ufoToKeep;
}
// Moves each UFO from left to right
function moveUFO() {
this.x = this.x + this.speed;
}
Although for this project I didn’t really create the illusion that the viewer is moving. I went by this project’s other name of “stuff passing by”. I wanted this project to feel like you were standing on the moon watching UFOs fly across space. UFOs of random color, size, and speed should fly across the screen from right to left. Also the stars in the background will be different each time you refresh the page. The hardest part about this project for me was keeping track of all the function that I had to make in order to fulfill the requirements of the project. Overall I’m pretty proud of how true to my original idea i was able to stay. While the sketch above is pretty simple, I think it translated very well to an animated project.
