misskey/packages/client/src/components/sparkle.vue

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Vue
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<template>
<span class="mk-sparkle">
<span ref="content">
<slot></slot>
</span>
<canvas ref="canvas"></canvas>
</span>
</template>
<script lang="ts">
import { defineComponent } from 'vue';
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import * as os from '@/os';
const sprite = new Image();
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sprite.src = '/client-assets/sparkle-spritesheet.png';
export default defineComponent({
props: {
count: {
type: Number,
required: true,
},
speed: {
type: Number,
required: true,
},
},
data() {
return {
sprites: [0,6,13,20],
particles: [],
anim: null,
ctx: null,
};
},
unmounted() {
window.cancelAnimationFrame(this.anim);
},
mounted() {
this.ctx = this.$refs.canvas.getContext('2d');
new ResizeObserver(this.resize).observe(this.$refs.content);
this.resize();
this.tick();
},
updated() {
this.resize();
},
methods: {
createSparkles(w, h, count) {
const holder = [];
for (let i = 0; i < count; i++) {
const color = '#' + ('000000' + Math.floor(Math.random() * 16777215).toString(16)).slice(-6);
holder[i] = {
position: {
x: Math.floor(Math.random() * w),
y: Math.floor(Math.random() * h)
},
style: this.sprites[ Math.floor(Math.random() * 4) ],
delta: {
x: Math.floor(Math.random() * 1000) - 500,
y: Math.floor(Math.random() * 1000) - 500
},
color: color,
opacity: Math.random(),
};
}
return holder;
},
draw(time) {
this.ctx.clearRect(0, 0, this.$refs.canvas.width, this.$refs.canvas.height);
this.ctx.beginPath();
const particleSize = Math.floor(this.fontSize / 2);
this.particles.forEach((particle) => {
var modulus = Math.floor(Math.random()*7);
if (Math.floor(time) % modulus === 0) {
particle.style = this.sprites[ Math.floor(Math.random()*4) ];
}
this.ctx.save();
this.ctx.globalAlpha = particle.opacity;
this.ctx.drawImage(sprite, particle.style, 0, 7, 7, particle.position.x, particle.position.y, particleSize, particleSize);
this.ctx.globalCompositeOperation = "source-atop";
this.ctx.globalAlpha = 0.5;
this.ctx.fillStyle = particle.color;
this.ctx.fillRect(particle.position.x, particle.position.y, particleSize, particleSize);
this.ctx.restore();
});
this.ctx.stroke();
},
tick() {
this.anim = window.requestAnimationFrame((time) => {
if (!this.$refs.canvas) {
return;
}
this.particles.forEach((particle) => {
if (!particle) {
return;
}
var randX = Math.random() > Math.random() * 2;
var randY = Math.random() > Math.random() * 3;
if (randX) {
particle.position.x += (particle.delta.x * this.speed) / 1500;
}
if (!randY) {
particle.position.y -= (particle.delta.y * this.speed) / 800;
}
if( particle.position.x > this.$refs.canvas.width ) {
particle.position.x = -7;
} else if (particle.position.x < -7) {
particle.position.x = this.$refs.canvas.width;
}
if (particle.position.y > this.$refs.canvas.height) {
particle.position.y = -7;
particle.position.x = Math.floor(Math.random() * this.$refs.canvas.width);
} else if (particle.position.y < -7) {
particle.position.y = this.$refs.canvas.height;
particle.position.x = Math.floor(Math.random() * this.$refs.canvas.width);
}
particle.opacity -= 0.005;
if (particle.opacity <= 0) {
particle.opacity = 1;
}
});
this.draw(time);
this.tick();
});
},
resize() {
if (this.$refs.content) {
const contentRect = this.$refs.content.getBoundingClientRect();
this.fontSize = parseFloat(getComputedStyle(this.$refs.content).fontSize);
const padding = this.fontSize * 0.2;
this.$refs.canvas.width = parseInt(contentRect.width + padding);
this.$refs.canvas.height = parseInt(contentRect.height + padding);
this.particles = this.createSparkles(this.$refs.canvas.width, this.$refs.canvas.height, this.count);
}
},
},
});
</script>
<style lang="scss" scoped>
.mk-sparkle {
position: relative;
display: inline-block;
> span {
display: inline-block;
}
> canvas {
position: absolute;
top: -0.1em;
left: -0.1em;
pointer-events: none;
}
}
</style>