350 lines
15 KiB
JavaScript
350 lines
15 KiB
JavaScript
/* Confetti by Patrik Svensson (http://metervara.net) */
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$(document).ready(function() {
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var frameRate = 30;
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var dt = 1.0 / frameRate;
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var DEG_TO_RAD = Math.PI / 180;
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var RAD_TO_DEG = 180 / Math.PI;
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var colors = [
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["#df0049", "#660671"],
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["#00e857", "#005291"],
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["#2bebbc", "#05798a"],
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["#ffd200", "#b06c00"]
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];
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function Vector2(_x, _y) {
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this.x = _x, this.y = _y;
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this.Length = function() {
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return Math.sqrt(this.SqrLength());
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}
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this.SqrLength = function() {
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return this.x * this.x + this.y * this.y;
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}
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this.Equals = function(_vec0, _vec1) {
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return _vec0.x == _vec1.x && _vec0.y == _vec1.y;
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}
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this.Add = function(_vec) {
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this.x += _vec.x;
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this.y += _vec.y;
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}
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this.Sub = function(_vec) {
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this.x -= _vec.x;
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this.y -= _vec.y;
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}
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this.Div = function(_f) {
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this.x /= _f;
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this.y /= _f;
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}
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this.Mul = function(_f) {
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this.x *= _f;
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this.y *= _f;
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}
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this.Normalize = function() {
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var sqrLen = this.SqrLength();
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if (sqrLen != 0) {
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var factor = 1.0 / Math.sqrt(sqrLen);
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this.x *= factor;
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this.y *= factor;
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}
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}
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this.Normalized = function() {
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var sqrLen = this.SqrLength();
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if (sqrLen != 0) {
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var factor = 1.0 / Math.sqrt(sqrLen);
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return new Vector2(this.x * factor, this.y * factor);
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}
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return new Vector2(0, 0);
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}
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}
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Vector2.Lerp = function(_vec0, _vec1, _t) {
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return new Vector2((_vec1.x - _vec0.x) * _t + _vec0.x, (_vec1.y - _vec0.y) * _t + _vec0.y);
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}
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Vector2.Distance = function(_vec0, _vec1) {
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return Math.sqrt(Vector2.SqrDistance(_vec0, _vec1));
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}
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Vector2.SqrDistance = function(_vec0, _vec1) {
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var x = _vec0.x - _vec1.x;
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var y = _vec0.y - _vec1.y;
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return (x * x + y * y);
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}
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Vector2.Scale = function(_vec0, _vec1) {
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return new Vector2(_vec0.x * _vec1.x, _vec0.y * _vec1.y);
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}
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Vector2.Min = function(_vec0, _vec1) {
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return new Vector2(Math.min(_vec0.x, _vec1.x), Math.min(_vec0.y, _vec1.y));
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}
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Vector2.Max = function(_vec0, _vec1) {
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return new Vector2(Math.max(_vec0.x, _vec1.x), Math.max(_vec0.y, _vec1.y));
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}
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Vector2.ClampMagnitude = function(_vec0, _len) {
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var vecNorm = _vec0.Normalized();
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return new Vector2(vecNorm.x * _len, vecNorm.y * _len);
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}
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Vector2.Sub = function(_vec0, _vec1) {
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return new Vector2(_vec0.x - _vec1.x, _vec0.y - _vec1.y);
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}
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function EulerMass(_x, _y, _mass, _drag) {
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this.position = new Vector2(_x, _y);
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this.mass = _mass;
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this.drag = _drag;
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this.force = new Vector2(0, 0);
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this.velocity = new Vector2(0, 0);
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this.AddForce = function(_f) {
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this.force.Add(_f);
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}
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this.Integrate = function(_dt) {
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var acc = this.CurrentForce(this.position);
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acc.Div(this.mass);
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var posDelta = new Vector2(this.velocity.x, this.velocity.y);
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posDelta.Mul(_dt);
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this.position.Add(posDelta);
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acc.Mul(_dt);
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this.velocity.Add(acc);
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this.force = new Vector2(0, 0);
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}
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this.CurrentForce = function(_pos, _vel) {
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var totalForce = new Vector2(this.force.x, this.force.y);
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var speed = this.velocity.Length();
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var dragVel = new Vector2(this.velocity.x, this.velocity.y);
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dragVel.Mul(this.drag * this.mass * speed);
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totalForce.Sub(dragVel);
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return totalForce;
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}
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}
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function ConfettiPaper(_x, _y) {
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this.pos = new Vector2(_x, _y);
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this.rotationSpeed = Math.random() * 600 + 800;
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this.angle = DEG_TO_RAD * Math.random() * 360;
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this.rotation = DEG_TO_RAD * Math.random() * 360;
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this.cosA = 1.0;
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this.size = 5.0;
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this.oscillationSpeed = Math.random() * 1.5 + 0.5;
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this.xSpeed = 40.0;
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this.ySpeed = Math.random() * 60 + 50.0;
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this.corners = new Array();
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this.time = Math.random();
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var ci = Math.round(Math.random() * (colors.length - 1));
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this.frontColor = colors[ci][0];
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this.backColor = colors[ci][1];
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for (var i = 0; i < 4; i++) {
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var dx = Math.cos(this.angle + DEG_TO_RAD * (i * 90 + 45));
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var dy = Math.sin(this.angle + DEG_TO_RAD * (i * 90 + 45));
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this.corners[i] = new Vector2(dx, dy);
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}
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this.Update = function(_dt) {
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this.time += _dt;
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this.rotation += this.rotationSpeed * _dt;
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this.cosA = Math.cos(DEG_TO_RAD * this.rotation);
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this.pos.x += Math.cos(this.time * this.oscillationSpeed) * this.xSpeed * _dt
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this.pos.y += this.ySpeed * _dt;
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if (this.pos.y > ConfettiPaper.bounds.y) {
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this.pos.x = Math.random() * ConfettiPaper.bounds.x;
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this.pos.y = 0;
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}
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}
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this.Draw = function(_g) {
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if (this.cosA > 0) {
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_g.fillStyle = this.frontColor;
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} else {
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_g.fillStyle = this.backColor;
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}
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_g.beginPath();
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_g.moveTo(this.pos.x + this.corners[0].x * this.size, this.pos.y + this.corners[0].y * this.size * this.cosA);
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for (var i = 1; i < 4; i++) {
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_g.lineTo(this.pos.x + this.corners[i].x * this.size, this.pos.y + this.corners[i].y * this.size * this.cosA);
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}
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_g.closePath();
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_g.fill();
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}
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}
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ConfettiPaper.bounds = new Vector2(0, 0);
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function ConfettiRibbon(_x, _y, _count, _dist, _thickness, _angle, _mass, _drag) {
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this.particleDist = _dist;
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this.particleCount = _count;
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this.particleMass = _mass;
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this.particleDrag = _drag;
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this.particles = new Array();
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var ci = Math.round(Math.random() * (colors.length - 1));
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this.frontColor = colors[ci][0];
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this.backColor = colors[ci][1];
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this.xOff = Math.cos(DEG_TO_RAD * _angle) * _thickness;
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this.yOff = Math.sin(DEG_TO_RAD * _angle) * _thickness;
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this.position = new Vector2(_x, _y);
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this.prevPosition = new Vector2(_x, _y);
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this.velocityInherit = Math.random() * 2 + 4;
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this.time = Math.random() * 100;
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this.oscillationSpeed = Math.random() * 2 + 2;
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this.oscillationDistance = Math.random() * 40 + 40;
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this.ySpeed = Math.random() * 40 + 80;
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for (var i = 0; i < this.particleCount; i++) {
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this.particles[i] = new EulerMass(_x, _y - i * this.particleDist, this.particleMass, this.particleDrag);
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}
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this.Update = function(_dt) {
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var i = 0;
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this.time += _dt * this.oscillationSpeed;
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this.position.y += this.ySpeed * _dt;
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this.position.x += Math.cos(this.time) * this.oscillationDistance * _dt;
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this.particles[0].position = this.position;
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var dX = this.prevPosition.x - this.position.x;
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var dY = this.prevPosition.y - this.position.y;
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var delta = Math.sqrt(dX * dX + dY * dY);
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this.prevPosition = new Vector2(this.position.x, this.position.y);
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for (i = 1; i < this.particleCount; i++) {
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var dirP = Vector2.Sub(this.particles[i - 1].position, this.particles[i].position);
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dirP.Normalize();
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dirP.Mul((delta / _dt) * this.velocityInherit);
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this.particles[i].AddForce(dirP);
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}
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for (i = 1; i < this.particleCount; i++) {
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this.particles[i].Integrate(_dt);
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}
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for (i = 1; i < this.particleCount; i++) {
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var rp2 = new Vector2(this.particles[i].position.x, this.particles[i].position.y);
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rp2.Sub(this.particles[i - 1].position);
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rp2.Normalize();
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rp2.Mul(this.particleDist);
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rp2.Add(this.particles[i - 1].position);
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this.particles[i].position = rp2;
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}
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if (this.position.y > ConfettiRibbon.bounds.y + this.particleDist * this.particleCount) {
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this.Reset();
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}
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}
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this.Reset = function() {
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this.position.y = -Math.random() * ConfettiRibbon.bounds.y;
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this.position.x = Math.random() * ConfettiRibbon.bounds.x;
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this.prevPosition = new Vector2(this.position.x, this.position.y);
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this.velocityInherit = Math.random() * 2 + 4;
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this.time = Math.random() * 100;
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this.oscillationSpeed = Math.random() * 2.0 + 1.5;
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this.oscillationDistance = Math.random() * 40 + 40;
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this.ySpeed = Math.random() * 40 + 80;
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var ci = Math.round(Math.random() * (colors.length - 1));
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this.frontColor = colors[ci][0];
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this.backColor = colors[ci][1];
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this.particles = new Array();
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for (var i = 0; i < this.particleCount; i++) {
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this.particles[i] = new EulerMass(this.position.x, this.position.y - i * this.particleDist, this.particleMass, this.particleDrag);
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}
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}
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this.Draw = function(_g) {
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for (var i = 0; i < this.particleCount - 1; i++) {
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var p0 = new Vector2(this.particles[i].position.x + this.xOff, this.particles[i].position.y + this.yOff);
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var p1 = new Vector2(this.particles[i + 1].position.x + this.xOff, this.particles[i + 1].position.y + this.yOff);
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if (this.Side(this.particles[i].position.x, this.particles[i].position.y, this.particles[i + 1].position.x, this.particles[i + 1].position.y, p1.x, p1.y) < 0) {
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_g.fillStyle = this.frontColor;
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_g.strokeStyle = this.frontColor;
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} else {
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_g.fillStyle = this.backColor;
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_g.strokeStyle = this.backColor;
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}
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if (i == 0) {
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_g.beginPath();
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_g.moveTo(this.particles[i].position.x, this.particles[i].position.y);
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_g.lineTo(this.particles[i + 1].position.x, this.particles[i + 1].position.y);
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_g.lineTo((this.particles[i + 1].position.x + p1.x) * 0.5, (this.particles[i + 1].position.y + p1.y) * 0.5);
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_g.closePath();
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_g.stroke();
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_g.fill();
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_g.beginPath();
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_g.moveTo(p1.x, p1.y);
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_g.lineTo(p0.x, p0.y);
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_g.lineTo((this.particles[i + 1].position.x + p1.x) * 0.5, (this.particles[i + 1].position.y + p1.y) * 0.5);
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_g.closePath();
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_g.stroke();
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_g.fill();
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} else if (i == this.particleCount - 2) {
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_g.beginPath();
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_g.moveTo(this.particles[i].position.x, this.particles[i].position.y);
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_g.lineTo(this.particles[i + 1].position.x, this.particles[i + 1].position.y);
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_g.lineTo((this.particles[i].position.x + p0.x) * 0.5, (this.particles[i].position.y + p0.y) * 0.5);
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_g.closePath();
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_g.stroke();
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_g.fill();
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_g.beginPath();
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_g.moveTo(p1.x, p1.y);
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_g.lineTo(p0.x, p0.y);
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_g.lineTo((this.particles[i + 1].position.x + p1.x) * 0.5, (this.particles[i + 1].position.y + p1.y) * 0.5);
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_g.closePath();
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_g.stroke();
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_g.fill();
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} else {
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_g.beginPath();
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_g.moveTo(this.particles[i].position.x, this.particles[i].position.y);
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_g.lineTo(this.particles[i + 1].position.x, this.particles[i + 1].position.y);
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_g.lineTo(p1.x, p1.y);
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_g.lineTo(p0.x, p0.y);
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_g.closePath();
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_g.stroke();
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_g.fill();
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}
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}
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}
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this.Side = function(x1, y1, x2, y2, x3, y3) {
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return ((x1 - x2) * (y3 - y2) - (y1 - y2) * (x3 - x2));
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}
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}
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ConfettiRibbon.bounds = new Vector2(0, 0);
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confetti = {};
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confetti.Context = function(parent) {
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var i = 0;
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var canvasParent = document.getElementById(parent);
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var canvas = document.createElement('canvas');
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canvas.width = canvasParent.offsetWidth;
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canvas.height = canvasParent.offsetHeight;
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canvasParent.appendChild(canvas);
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var context = canvas.getContext('2d');
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var interval = null;
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var confettiRibbonCount = 7;
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var rpCount = 30;
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var rpDist = 8.0;
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var rpThick = 8.0;
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var confettiRibbons = new Array();
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ConfettiRibbon.bounds = new Vector2(canvas.width, canvas.height);
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for (i = 0; i < confettiRibbonCount; i++) {
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confettiRibbons[i] = new ConfettiRibbon(Math.random() * canvas.width, -Math.random() * canvas.height * 2, rpCount, rpDist, rpThick, 45, 1, 0.05);
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}
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var confettiPaperCount = 25;
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var confettiPapers = new Array();
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ConfettiPaper.bounds = new Vector2(canvas.width, canvas.height);
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for (i = 0; i < confettiPaperCount; i++) {
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confettiPapers[i] = new ConfettiPaper(Math.random() * canvas.width, Math.random() * canvas.height);
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}
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this.resize = function() {
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canvas.width = canvasParent.offsetWidth;
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canvas.height = canvasParent.offsetHeight;
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ConfettiPaper.bounds = new Vector2(canvas.width, canvas.height);
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ConfettiRibbon.bounds = new Vector2(canvas.width, canvas.height);
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}
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this.start = function() {
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this.stop()
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var context = this
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this.interval = setInterval(function() {
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context.update();
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}, 1000.0 / frameRate)
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}
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this.stop = function() {
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clearInterval(this.interval);
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}
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this.update = function() {
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var i = 0;
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context.clearRect(0, 0, canvas.width, canvas.height);
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for (i = 0; i < confettiPaperCount; i++) {
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confettiPapers[i].Update(dt);
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confettiPapers[i].Draw(context);
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}
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for (i = 0; i < confettiRibbonCount; i++) {
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confettiRibbons[i].Update(dt);
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confettiRibbons[i].Draw(context);
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}
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}
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}
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var confettiInstance = new confetti.Context('confetti');
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confettiInstance.start();
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$(window).resize(function() {
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confettiInstance.resize();
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});
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});
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