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four.html
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<html>
<body style="background: #000; margin: 0">
<!-- By Alok, using code from https://codepen.io/whqet/pen/Auzch -->
<canvas id="c"></canvas>
<script>
var ctx = c.getContext('2d');
var fireworks = [];
var particles = [];
var hue = 120;
var timerTotal = 200;
var timerTick = 0;
function random(min, max) {
return Math.random() * (max - min) + min;
}
function calculateDistance(p1x, p1y, p2x, p2y) {
var xDistance = p1x - p2x;
var yDistance = p1y - p2y;
return Math.sqrt(Math.pow(xDistance, 2) + Math.pow(yDistance, 2));
}
function Firework(sx, sy, tx, ty) {
// actual coordinates
this.x = sx;
this.y = sy;
// starting coordinates
this.sx = sx;
this.sy = sy;
// target coordinates
this.tx = tx;
this.ty = ty;
// distance from starting point to target
this.distanceToTarget = calculateDistance( sx, sy, tx, ty );
this.distanceTraveled = 0;
// track the past coordinates of each firework to create a trail effect, increase the coordinate count to create more prominent trails
this.coordinates = [];
this.coordinateCount = 3;
// populate initial coordinate collection with the current coordinates
while(this.coordinateCount--) {
this.coordinates.push( [ this.x, this.y ] );
}
this.angle = Math.atan2( ty - sy, tx - sx );
this.speed = 2;
this.acceleration = 1.02;
this.brightness = random( 50, 70 );
// circle target indicator radius
this.targetRadius = 1;
}
// update firework
Firework.prototype.update = function( index ) {
// remove last item in coordinates array
this.coordinates.pop();
// add current coordinates to the start of the array
this.coordinates.unshift([ this.x, this.y ]);
// cycle the circle target indicator radius
this.targetRadius++;
// speed up the firework
this.speed *= this.acceleration;
// get the current velocities based on angle and speed
var vx = Math.cos(this.angle) * this.speed;
var vy = Math.sin(this.angle) * this.speed;
// how far will the firework have traveled with velocities applied?
this.distanceTraveled = calculateDistance(this.sx, this.sy, this.x + vx, this.y + vy);
// if the distance traveled, including velocities, is greater than the initial distance to the target, then the target has been reached
if(this.distanceTraveled >= this.distanceToTarget) {
createParticles(this.tx, this.ty);
// remove the firework, use the index passed into the update function to determine which to remove
fireworks.splice(index, 1);
} else {
// target not reached, keep traveling
this.x += vx;
this.y += vy;
}
}
// draw firework
Firework.prototype.draw = function() {
ctx.beginPath();
// move to the last tracked coordinate in the set, then draw a line to the current x and y
ctx.moveTo( this.coordinates[ this.coordinates.length - 1][ 0 ], this.coordinates[ this.coordinates.length - 1][ 1 ] );
ctx.lineTo( this.x, this.y );
ctx.strokeStyle = 'hsl(' + hue + ', 100%, ' + this.brightness + '%)';
ctx.stroke();
// draw the target for this firework with a pulsing circle
ctx.beginPath();
var R = Math.abs(Math.sin(this.targetRadius / 10)) * 3 + 6;
ctx.lineWidth = R * 0.35;
var r = R * 0.35;
ctx.moveTo(this.tx + r - R, this.ty - R);
ctx.arcTo(this.tx + R, this.ty - R, this.tx + R, this.ty + R, r);
ctx.arcTo(this.tx + R, this.ty + R, this.tx - R, this.ty + R, r);
ctx.arcTo(this.tx - R, this.ty + R, this.tx - R, this.ty - R, r);
ctx.arcTo(this.tx - R, this.ty - R, this.tx + R, this.ty - R, r);
ctx.closePath();
ctx.stroke();
ctx.beginPath();
ctx.fillStyle = 'hsl(' + hue + ', 100%, ' + this.brightness + '%)';
R = R / 3;
r = R * 0.35;
ctx.moveTo(this.tx + r - R, this.ty - R);
ctx.arcTo(this.tx + R, this.ty - R, this.tx + R, this.ty + R, r);
ctx.arcTo(this.tx + R, this.ty + R, this.tx - R, this.ty + R, r);
ctx.arcTo(this.tx - R, this.ty + R, this.tx - R, this.ty - R, r);
ctx.arcTo(this.tx - R, this.ty - R, this.tx + R, this.ty - R, r);
ctx.closePath();
ctx.fill();
ctx.lineWidth = 1;
}
// create particle
function Particle( x, y ) {
this.x = x;
this.y = y;
// track the past coordinates of each particle to create a trail effect, increase the coordinate count to create more prominent trails
this.coordinates = [];
this.coordinateCount = 5;
while( this.coordinateCount-- ) {
this.coordinates.push( [ this.x, this.y ] );
}
// set a random angle in all possible directions, in radians
this.angle = random( 0, Math.PI * 2 );
this.speed = random( 1, 10 );
// friction will slow the particle down
this.friction = 0.97;
// gravity will be applied and pull the particle down
this.gravity = 1.5;
// set the hue to a random number +-50 of the overall hue variable
this.hue = random( hue - 50, hue + 50 );
this.brightness = random( 50, 80 );
this.alpha = 1;
// set how fast the particle fades out
this.decay = random(0.015, 0.03);
}
// update particle
Particle.prototype.update = function( index ) {
// remove last item in coordinates array
this.coordinates.pop();
// add current coordinates to the start of the array
this.coordinates.unshift( [ this.x, this.y ] );
// slow down the particle
this.speed *= this.friction;
// apply velocity
this.x += Math.cos( this.angle ) * this.speed;
this.y += Math.sin( this.angle ) * this.speed + this.gravity;
// fade out the particle
this.alpha -= this.decay;
// remove the particle once the alpha is low enough, based on the passed in index
if (this.alpha <= this.decay) {
particles.splice( index, 1);
}
}
// draw particle
Particle.prototype.draw = function() {
ctx. beginPath();
// move to the last tracked coordinates in the set, then draw a line to the current x and y
ctx.moveTo( this.coordinates[ this.coordinates.length - 1 ][ 0 ], this.coordinates[ this.coordinates.length - 1 ][ 1 ] );
ctx.lineTo( this.x, this.y );
ctx.strokeStyle = 'hsla(' + this.hue + ', 100%, ' + this.brightness + '%, ' + this.alpha + ')';
ctx.stroke();
}
// create explosion
function createParticles(x, y) {
var particleCount = 300;
while (particleCount--) {
particles.push(new Particle(x, y));
}
}
function loop() {
var cw = window.innerWidth;
var ch = window.innerHeight;
c.width = cw;
c.height = ch;
requestAnimationFrame(loop);
hue = random(0, 360);
// normally, clearRect() would be used to clear the canvas
// we want to create a trailing effect though
// setting the composite operation to destination-out will allow us to clear the canvas at a specific opacity, rather than wiping it entirely
ctx.globalCompositeOperation = 'destination-out';
// decrease the alpha property to create more prominent trails
ctx.fillStyle = 'rgba(0, 0, 0, 0.5)';
ctx.fillRect( 0, 0, cw, ch );
// change the composite operation back to our main mode
// lighter creates bright highlight points as the fireworks and particles overlap each other
ctx.globalCompositeOperation = 'lighter';
// loop over each firework, draw it, update it
var i = fireworks.length;
while (i--) {
fireworks[i].draw();
fireworks[i].update( i );
}
// loop over each particle, draw it, update it
var i = particles.length;
while(i--) {
particles[i].draw();
particles[i].update(i);
}
// kj
// mli
// ongh
// qp fe
// rstuvwx
// cd
// ba
var character = {
0: [300, 320],
1: [280, 320],
2: [280, 300],
3: [300, 300],
4: [300, 280],
5: [300, 260],
6: [280, 260],
7: [280, 240],
8: [300, 240],
9: [300, 220],
10: [300, 200],
11: [280, 200],
12: [280, 220],
13: [260, 220],
14: [260, 240],
15: [240, 240],
16: [220, 260],
17: [200, 260],
18: [200, 280],
19: [220, 280],
20: [240, 280],
21: [260, 280],
22: [280, 280],
23: [320, 280],
};
// char dimenstions are: [200, 200 - 300, 320]
if (timerTick % 2 == 0) {
if (character[timerTick/2]) {
fireworks.push(new Firework(cw/2, ch * 1.5,
cw/2 + character[timerTick/2][0]*2 - 500,
ch/2 + character[timerTick/2][1]*2 - 520));
}
}
timerTick = (timerTick + 1) % timerTotal;
}
window.onload = loop;
</script>
</body>
</html>