七个基于JavaScript实现的情人节表白特效
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<div class="page page-thunder-to-text">
<input id="input" type="text" maxlength="24" placeholder="I love you!">
<canvas id="canvas"></canvas>
</div>
<script>
let canvas, ctx, w, h, thunder, text, particles, input;
function Thunder(options) {
options = options || {};
this.lifespan = options.lifespan || Math.round(Math.random() * 10 + 10);
this.maxlife = this.lifespan;
this.color = options.color || '#fefefe';
this.glow = options.glow || '#2323fe';
this.x = options.x || Math.random() * w;
this.y = options.y || Math.random() * h;
this.width = options.width || 2;
this.direct = options.direct || Math.random() * Math.PI * 2;
this.max = options.max || Math.round(Math.random() * 10 + 20);
this.segments = [...new Array(this.max)].map(() => {
return {
direct: this.direct + (Math.PI * Math.random() * 0.2 - 0.1),
length: Math.random() * 20 + 80,
change: Math.random() * 0.04 - 0.02
};
});
this.update = function(index, array) {
this.segments.forEach(s => { (s.direct += s.change) && Math.random() > 0.96 && (s.change *= -1) });
(this.lifespan > 0 && this.lifespan--) || this.remove(index, array);
}
this.render = function(ctx) {
if (this.lifespan <= 0) return;
ctx.beginPath();
ctx.globalAlpha = this.lifespan / this.maxlife;
ctx.strokeStyle = this.color;
ctx.lineWidth = this.width;
ctx.shadowBlur = 32;
ctx.shadowColor = this.glow;
ctx.moveTo(this.x, this.y);
let prev = { x: this.x, y: this.y };
this.segments.forEach(s => {
const x = prev.x + Math.cos(s.direct) * s.length;
const y = prev.y + Math.sin(s.direct) * s.length;
prev = { x: x, y: y };
ctx.lineTo(x, y);
});
ctx.stroke();
ctx.closePath();
ctx.shadowBlur = 0;
const strength = Math.random() * 80 + 40;
const light = ctx.createRadialGradient(this.x, this.y, 0, this.x, this.y, strength);
light.addColorStop(0, 'rgba(250, 200, 50, 0.6)');
light.addColorStop(0.1, 'rgba(250, 200, 50, 0.2)');
light.addColorStop(0.4, 'rgba(250, 200, 50, 0.06)');
light.addColorStop(0.65, 'rgba(250, 200, 50, 0.01)');
light.addColorStop(0.8, 'rgba(250, 200, 50, 0)');
ctx.beginPath();
ctx.fillStyle = light;
ctx.arc(this.x, this.y, strength, 0, Math.PI * 2);
ctx.fill();
ctx.closePath();
}
this.remove = function(index, array) {
array.splice(index, 1);
}
}
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