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src/client/app/common/views/components/trends.chart.vue

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