370 lines
12 KiB
PHP
370 lines
12 KiB
PHP
<!doctype html>
|
||
<html>
|
||
<head>
|
||
<meta charset="utf-8">
|
||
<title>HTML5 canvas炫酷喜庆全屏烟花动画特效 from https://github.com/sunyctf/js-effects </title>
|
||
|
||
<style>
|
||
/* basic styles for black background and crosshair cursor | 黑色背景和十字光标的基本样式 */
|
||
body {
|
||
background: rgba(255,255,255,0.2);
|
||
margin: 0;
|
||
}
|
||
|
||
canvas {
|
||
cursor: crosshair;
|
||
display: block;
|
||
}
|
||
</style>
|
||
|
||
</head>
|
||
<body>
|
||
|
||
<canvas id="canvas"></canvas>
|
||
|
||
<script>
|
||
// when animating on canvas, it is best to use requestAnimationFrame instead of setTimeout or setInterval
|
||
// 在画布上设置动画时，最好使用requestAnimationFrame而不是setTimeout或setInterval
|
||
// not supported in all browsers though and sometimes needs a prefix, so we need a shim
|
||
// 但并非所有浏览器都支持，有时需要前缀，因此我们需要垫片
|
||
window.requestAnimFrame = ( function() {
|
||
// 浏览器兼容写法
|
||
// var requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame
|
||
// var cancelAnimationFrame = window.cancelAnimationFrame || window.mozCancelAnimationFrame
|
||
return window.requestAnimationFrame ||
|
||
window.webkitRequestAnimationFrame ||
|
||
window.mozRequestAnimationFrame ||
|
||
function( callback ) {
|
||
// 时间间隔为什么是1000/60,这是因为大多数屏幕渲染的时间间隔是每秒60帧。
|
||
window.setTimeout( callback, 1000 / 60 );
|
||
};
|
||
})();
|
||
|
||
// now we will setup our basic variables for the demo
|
||
var canvas = document.getElementById( 'canvas' ),
|
||
ctx = canvas.getContext( '2d' ),
|
||
// full screen dimensions
|
||
cw = window.innerWidth,
|
||
ch = window.innerHeight,
|
||
// firework collection
|
||
fireworks = [],
|
||
// particle collection
|
||
particles = [],
|
||
// starting hue
|
||
hue = 120,
|
||
// when launching fireworks with a click, too many get launched at once without a limiter, one launch per 5 loop ticks
|
||
limiterTotal = 5,
|
||
limiterTick = 0,
|
||
// this will time the auto launches of fireworks, one launch per 80 loop ticks
|
||
timerTotal = 80,
|
||
timerTick = 0,
|
||
mousedown = false,
|
||
// mouse x coordinate,
|
||
mx,
|
||
// mouse y coordinate
|
||
my;
|
||
|
||
// set canvas dimensions
|
||
canvas.width = cw;
|
||
canvas.height = ch;
|
||
|
||
// now we are going to setup our function placeholders for the entire demo
|
||
|
||
// get a random number within a range
|
||
function random( min, max ) {
|
||
return Math.random() * ( max - min ) + min;
|
||
}
|
||
|
||
// calculate the distance between two points
|
||
function calculateDistance( p1x, p1y, p2x, p2y ) {
|
||
var xDistance = p1x - p2x,
|
||
yDistance = p1y - p2y;
|
||
return Math.sqrt( Math.pow( xDistance, 2 ) + Math.pow( yDistance, 2 ) );
|
||
}
|
||
|
||
// create firework
|
||
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 = 1.05;
|
||
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
|
||
if( this.targetRadius < 8 ) {
|
||
this.targetRadius += 0.3;
|
||
} else {
|
||
this.targetRadius = 1;
|
||
}
|
||
|
||
// 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,
|
||
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();
|
||
|
||
ctx.beginPath();
|
||
// draw the target for this firework with a pulsing circle
|
||
ctx.arc( this.tx, this.ty, this.targetRadius, 0, Math.PI * 2 );
|
||
ctx.stroke();
|
||
}
|
||
|
||
// 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 = 0.95;
|
||
// gravity will be applied and pull the particle down
|
||
this.gravity = 1;
|
||
// set the hue to a random number +-20 of the overall hue variable
|
||
this.hue = random( hue - 20, hue + 20 );
|
||
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 particle group/explosion
|
||
function createParticles( x, y ) {
|
||
// increase the particle count for a bigger explosion, beware of the canvas performance hit with the increased particles though
|
||
var particleCount = 30;
|
||
while( particleCount-- ) {
|
||
particles.push( new Particle( x, y ) );
|
||
}
|
||
}
|
||
var slogan = [
|
||
"有志者，事竟成。",
|
||
"心有多大，舞台就有多大。",
|
||
"相信自己，相信未来。",
|
||
"追求卓越，拒绝平庸。",
|
||
"敢于梦想，敢于失败。",
|
||
"没有不可能，只有想不到。",
|
||
"坚持不懈，勇往直前。",
|
||
"限制你的，只有你的想象力。",
|
||
"每一天都是进步的机会。",
|
||
"成功不是终点，失败不是终点。",
|
||
"热爱你所做的，才能做到最好。",
|
||
"每一天都是新的开始。",
|
||
"冠军永不放弃，直到成功。",
|
||
"成功不是一次性事件，而是一种生活方式。",
|
||
"你不能坐在岸边过海。",
|
||
"你注定要成为的唯一一个人是你决定成为的人。",
|
||
"我们实现明天的唯一限制将是今天我们的怀疑。",
|
||
"如果你想生活得快乐，把它与目标联系起来。",
|
||
"未来属于那些相信自己梦想之美的人。",
|
||
"成功是每天重复的小努力的累积。",
|
||
"如果你能梦想它，你就能实现它。",
|
||
"相信你能做到，你已经完成了一半。",
|
||
"预测未来的最好方法是创造它。",
|
||
"实现梦想的唯一方法就是醒来。",
|
||
"成功不仅仅是赚钱，而是产生影响。",
|
||
"确保成功的唯一方法是失败到那里。",
|
||
"唯一能保证成功的是努力工作。",
|
||
"梦想是成功的起点。",
|
||
"每一次失败都是一次学习的机会。",
|
||
"成功来自于不断的努力和坚持。",
|
||
"相信自己，相信奇迹。",
|
||
"梦想是行动的催化剂。",
|
||
"成功来自于内心的力量。",
|
||
"永不放弃，直到成功。",
|
||
"每一次尝试都是向成功迈进的一步。",
|
||
"成功来自于不断的自我超越。",
|
||
"梦想是前进的动力。",
|
||
"成功来自于不断的创新。",
|
||
"梦想是实现可能的开始。",
|
||
"成功来自于不断的学习和成长。",
|
||
"梦想是生活的色彩。",
|
||
"成功来自于不断的挑战自我。"
|
||
];
|
||
var text = slogan[Math.floor(Math.random() * slogan.length)];
|
||
|
||
// main demo loop
|
||
function loop() {
|
||
// this function will run endlessly with requestAnimationFrame
|
||
requestAnimFrame( loop );
|
||
|
||
// increase the hue to get different colored fireworks over time
|
||
hue += 0.5;
|
||
|
||
// 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';
|
||
|
||
// var text = "成功AC!!";
|
||
ctx.font = "50px sans-serif";
|
||
var textData = ctx.measureText(text);
|
||
ctx.fillStyle = "rgba("+parseInt(random(0,255))+","+parseInt(random(0,255))+","+parseInt(random(0,255))+",0.6)";
|
||
ctx.fillText(text,cw /2-textData.width/2,ch/2);
|
||
|
||
// 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 );
|
||
}
|
||
|
||
// launch fireworks automatically to random coordinates, when the mouse isn't down
|
||
if( timerTick >= timerTotal ) {
|
||
if( !mousedown ) {
|
||
// start the firework at the bottom middle of the screen, then set the random target coordinates, the random y coordinates will be set within the range of the top half of the screen
|
||
|
||
for(var h=0;h<50;h++)
|
||
{
|
||
fireworks.push( new Firework( cw / 2, ch/2, random( 0, cw ), random( 0, ch ) ) );
|
||
}
|
||
|
||
|
||
timerTick = 0;
|
||
}
|
||
} else {
|
||
timerTick++;
|
||
}
|
||
|
||
// limit the rate at which fireworks get launched when mouse is down
|
||
if( limiterTick >= limiterTotal ) {
|
||
if( mousedown ) {
|
||
// start the firework at the bottom middle of the screen, then set the current mouse coordinates as the target
|
||
fireworks.push( new Firework( cw / 2, ch/2, mx, my ) );
|
||
limiterTick = 0;
|
||
}
|
||
} else {
|
||
limiterTick++;
|
||
}
|
||
}
|
||
|
||
// mouse event bindings
|
||
// update the mouse coordinates on mousemove
|
||
canvas.addEventListener( 'mousemove', function( e ) {
|
||
mx = e.pageX - canvas.offsetLeft;
|
||
my = e.pageY - canvas.offsetTop;
|
||
});
|
||
|
||
// toggle mousedown state and prevent canvas from being selected
|
||
canvas.addEventListener( 'mousedown', function( e ) {
|
||
e.preventDefault();
|
||
mousedown = true;
|
||
});
|
||
|
||
canvas.addEventListener( 'mouseup', function( e ) {
|
||
e.preventDefault();
|
||
mousedown = false;
|
||
});
|
||
|
||
// once the window loads, we are ready for some fireworks!
|
||
window.onload = loop;
|
||
|
||
</script>
|
||
</body>
|
||
</html>
|