egirlskey/packages/client/src/components/mini-chart.vue

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<template>
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<svg :viewBox="`0 0 ${ viewBoxX } ${ viewBoxY }`" style="overflow:visible">
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<defs>
<linearGradient :id="gradientId" x1="0" x2="0" y1="1" y2="0">
<stop offset="0%" :stop-color="color" stop-opacity="0"></stop>
<stop offset="100%" :stop-color="color" stop-opacity="0.65"></stop>
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</linearGradient>
</defs>
<polygon
:points="polygonPoints"
:style="`stroke: none; fill: url(#${ gradientId });`"
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/>
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<polyline
:points="polylinePoints"
fill="none"
:stroke="color"
stroke-width="2"
/>
<circle
:cx="headX"
:cy="headY"
r="3"
:fill="color"
/>
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</svg>
</template>
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<script lang="ts" setup>
import { onUnmounted, watch } from 'vue';
import { v4 as uuid } from 'uuid';
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import tinycolor from 'tinycolor2';
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const props = defineProps<{
src: number[];
}>();
const viewBoxX = 50;
const viewBoxY = 50;
const gradientId = uuid();
let polylinePoints = $ref('');
let polygonPoints = $ref('');
let headX = $ref<number | null>(null);
let headY = $ref<number | null>(null);
let clock = $ref<number | null>(null);
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const accent = tinycolor(getComputedStyle(document.documentElement).getPropertyValue('--accent'));
const color = accent.toRgbString();
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function draw(): void {
const stats = props.src.slice().reverse();
const peak = Math.max.apply(null, stats) || 1;
const _polylinePoints = stats.map((n, i) => [
i * (viewBoxX / (stats.length - 1)),
(1 - (n / peak)) * viewBoxY,
]);
polylinePoints = _polylinePoints.map(xy => `${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];
headY = _polylinePoints[_polylinePoints.length - 1][1];
}
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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
clock = window.setInterval(draw, 1000);
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onUnmounted(() => {
window.clearInterval(clock);
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});
</script>