132 lines
4.2 KiB
JavaScript
132 lines
4.2 KiB
JavaScript
function distance(p1, p2) {
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return Math.sqrt((p1.x-p2.x)**2 + (p1.y-p2.y)**2);
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}
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function directionalScale(p1, value) {
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if (Math.abs(p1.x) >= Math.abs(p1.y)) {
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const k = Math.abs(p1.x)/Math.abs(p1.y);
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const output = {};
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output.x = Math.sign(p1.x)*value;
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output.y = Math.sign(p1.y)*value*k;
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return output;
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} else {
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const k = Math.abs(p1.y)/Math.abs(p1.x);
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const output = {};
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output.y = Math.sign(p1.y)*value;
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output.x = Math.sign(p1.x)*value*k;
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return output;
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}
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}
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class N {
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constructor(world, mass=1, x=0, y=window.innerHeight - 43, bounce=0.7) {
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this.pos = {};
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this.vel = {};
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world.addObject(this);
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this.world = world;
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this.mass = mass || 1;
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this.pos.x = x || 0;
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this.pos.y = y || window.innerHeight - 43;
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this.vel.x = 0;
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this.vel.y = 0;
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this.bounce = bounce;
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this.element = document.createElement("div");
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this.element.classList.add("anN");
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this.element.innerText = "n";
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document.body.appendChild(this.element);
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}
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draw() {
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this.vel.y -= this.world.gravity;
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this.vel.x -= this.vel.x < 0 ? -this.world.airResistance * this.vel.x**2 : this.world.airResistance * this.vel.x**2;
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this.vel.y -= this.vel.y < 0 ? -this.world.airResistance * this.vel.y**2 : this.world.airResistance * this.vel.y**2;
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this.pos.x += this.vel.x;
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this.pos.y += this.vel.y;
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if (this.pos.x < 0 || this.pos.x > (window.innerWidth - 20)) {
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this.vel.x = -this.vel.x*this.bounce;
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this.vel.y = this.vel.y*this.bounce;
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if (this.pos.x < 0) {
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this.pos.x = 0;
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} else {
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this.pos.x = window.innerWidth - 20;
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}
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}
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if (this.pos.y < -9 || this.pos.y > (window.innerHeight - 25)) {
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this.vel.y = -this.vel.y*this.bounce;
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this.vel.x = this.vel.x*this.bounce;
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if (this.pos.y < -9) {
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this.pos.y = -9;
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} else {
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this.pos.y = window.innerHeight - 25;
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}
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}
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/*if (mouseDown) {
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if (distance(this.pos, {x: cursorX, y: cursorY}) > 5) {
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const force = directionalScale({
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x: cursorX - this.pos.x,
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y: cursorY - this.pos.y
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}, distance(this.pos, {x: cursorX, y: cursorY}) ** -1);
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this.vel.x += force.x * 1;
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document.getElementById("xForce").value = force.x+1;
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this.vel.y += force.y * 1;
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document.getElementById("yForce").value = force.y+1;
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} else {
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this.vel.x = 0;
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this.vel.y = 0;
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}
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}*/
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if (mouseDown) {
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this.nudge((cursorX - this.pos.x)/50, (cursorY - this.pos.y)/50);
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}
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this.element.style.left = this.pos.x + "px";
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this.element.style.bottom = this.pos.y + "px";
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}
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nudge(x=0,y=0) {
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this.vel.x += x;
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this.vel.y += y;
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}
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}
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class World {
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draw() {
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this.objects.forEach(e => e.draw());
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}
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addObject(object) {
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this.objects.push(object);
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}
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constructor(gravity=1, airResistance) {
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this.gravity = gravity;
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this.airResistance = airResistance || 0.001;
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this.objects = [];
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}
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}
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let world;
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let n;
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let cursorX;
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let cursorY;
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let mouseDown = false;
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let mouseDownEver = false;
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document.onmousedown = function(e) {
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if (e.button === 0) {
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mouseDown = true;
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mouseDownEver = true;
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document.getElementById("hint").innerText = "";
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}
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};
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document.onmouseup = function(e) {
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if (e.button === 0) {
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mouseDown = false;
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}
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};
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document.addEventListener("DOMContentLoaded", () => {
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world = new World();
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n = new N(world);
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setInterval(() => {world.draw()}, 10);
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setTimeout(() => {
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if (!mouseDownEver) {
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document.getElementById("hint").innerText = "This works best on a PC. Try clicking/holding your mouse. ;)"
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}
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}, 3000)
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});
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document.addEventListener("mousemove", (e) => {
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cursorX = e.pageX;
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cursorY = window.innerHeight - e.pageY;
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}); |