84 lines
2.1 KiB
Vue
84 lines
2.1 KiB
Vue
<template>
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<svg :viewBox="`0 0 ${ viewBoxX } ${ viewBoxY }`" style="overflow:visible">
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<defs>
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<linearGradient :id="gradientId" x1="0" x2="0" y1="1" y2="0">
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<stop offset="0%" :stop-color="color"></stop>
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<stop offset="100%" :stop-color="colorAlpha"></stop>
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</linearGradient>
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<mask :id="maskId" x="0" y="0" :width="viewBoxX" :height="viewBoxY">
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<polygon
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:points="polygonPoints"
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fill="#fff"
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fill-opacity="0.5"
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/>
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</mask>
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</defs>
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<rect
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x="-10" y="-10"
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:width="viewBoxX + 20" :height="viewBoxY + 20"
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:style="`stroke: none; fill: url(#${ gradientId }); mask: url(#${ maskId })`"
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/>
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<polyline
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:points="polylinePoints"
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fill="none"
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:stroke="color"
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stroke-width="2"
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/>
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<circle
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:cx="headX"
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:cy="headY"
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r="3"
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:fill="color"
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/>
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</svg>
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</template>
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<script lang="ts" setup>
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import { onUnmounted, watch } from 'vue';
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import { v4 as uuid } from 'uuid';
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import tinycolor from 'tinycolor2';
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const props = defineProps<{
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src: number[];
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}>();
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const viewBoxX = 50;
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const viewBoxY = 50;
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const gradientId = uuid();
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const maskId = uuid();
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let polylinePoints = $ref('');
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let polygonPoints = $ref('');
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let headX = $ref<number | null>(null);
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let headY = $ref<number | null>(null);
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let clock = $ref<number | null>(null);
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const accent = tinycolor(getComputedStyle(document.documentElement).getPropertyValue('--accent'));
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const color = accent.toRgbString();
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const colorAlpha = accent.clone().setAlpha(1).toRgbString();
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function draw(): void {
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const stats = props.src.slice().reverse();
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const peak = Math.max.apply(null, stats) || 1;
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const _polylinePoints = stats.map((n, i) => [
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i * (viewBoxX / (stats.length - 1)),
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(1 - (n / peak)) * viewBoxY,
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]);
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polylinePoints = _polylinePoints.map(xy => `${xy[0]},${xy[1]}`).join(' ');
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polygonPoints = `0,${ viewBoxY } ${ polylinePoints } ${ viewBoxX },${ viewBoxY }`;
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headX = _polylinePoints[_polylinePoints.length - 1][0];
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headY = _polylinePoints[_polylinePoints.length - 1][1];
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}
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watch(() => props.src, draw, { immediate: true });
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// Vueが何故かWatchを発動させない場合があるので
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clock = window.setInterval(draw, 1000);
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onUnmounted(() => {
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window.clearInterval(clock);
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});
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</script>
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