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MisskeyIO/src/client/components/mini-chart.vue

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<template>
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<svg :viewBox="`0 0 ${ viewBoxX } ${ viewBoxY }`" style="overflow:visible">
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<defs>
<linearGradient :id="gradientId" x1="0" x2="0" y1="1" y2="0">
<stop offset="0%" stop-color="hsl(200, 80%, 70%)"></stop>
<stop offset="100%" stop-color="hsl(90, 80%, 70%)"></stop>
</linearGradient>
<mask :id="maskId" x="0" y="0" :width="viewBoxX" :height="viewBoxY">
<polygon
:points="polygonPoints"
fill="#fff"
fill-opacity="0.5"/>
<polyline
:points="polylinePoints"
fill="none"
stroke="#fff"
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stroke-width="2"/>
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<circle
:cx="headX"
:cy="headY"
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r="3"
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fill="#fff"/>
</mask>
</defs>
<rect
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x="-10" y="-10"
:width="viewBoxX + 20" :height="viewBoxY + 20"
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:style="`stroke: none; fill: url(#${ gradientId }); mask: url(#${ maskId })`"/>
</svg>
</template>
<script lang="ts">
import Vue from 'vue';
import { v4 as uuid } from 'uuid';
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export default Vue.extend({
props: {
src: {
type: Array,
required: true
}
},
data() {
return {
viewBoxX: 50,
viewBoxY: 30,
gradientId: uuid(),
maskId: uuid(),
polylinePoints: '',
polygonPoints: '',
headX: null,
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headY: null,
clock: null
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};
},
watch: {
src() {
this.draw();
}
},
created() {
this.draw();
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// Vueが何故かWatchを発動させない場合があるので
this.clock = setInterval(this.draw, 1000);
},
beforeDestroy() {
clearInterval(this.clock);
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},
methods: {
draw() {
const stats = this.src.slice().reverse();
const peak = Math.max.apply(null, stats) || 1;
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const polylinePoints = stats.map((n, i) => [
i * (this.viewBoxX / (stats.length - 1)),
(1 - (n / peak)) * this.viewBoxY
]);
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this.polylinePoints = polylinePoints.map(xy => `${xy[0]},${xy[1]}`).join(' ');
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this.polygonPoints = `0,${ this.viewBoxY } ${ this.polylinePoints } ${ this.viewBoxX },${ this.viewBoxY }`;
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this.headX = polylinePoints[polylinePoints.length - 1][0];
this.headY = polylinePoints[polylinePoints.length - 1][1];
}
}
});
</script>