misskey/src/web/app/desktop/views/components/activity.chart.vue

<template>
<svg :viewBox="`0 0 ${ viewBoxX } ${ viewBoxY }`" preserveAspectRatio="none" @mousedown.prevent="onMousedown">
	<title>Black ... Total<br/>Blue ... Posts<br/>Red ... Replies<br/>Green ... Reposts</title>
	<polyline
		:points="pointsPost"
		fill="none"
		stroke-width="1"
		stroke="#41ddde"/>
	<polyline
		:points="pointsReply"
		fill="none"
		stroke-width="1"
		stroke="#f7796c"/>
	<polyline
		:points="pointsRepost"
		fill="none"
		stroke-width="1"
		stroke="#a1de41"/>
	<polyline
		:points="pointsTotal"
		fill="none"
		stroke-width="1"
		stroke="#555"
		stroke-dasharray="2 2"/>
</svg>
</template>

<script lang="ts">
import Vue from 'vue';

function dragListen(fn) {
	window.addEventListener('mousemove',  fn);
	window.addEventListener('mouseleave', dragClear.bind(null, fn));
	window.addEventListener('mouseup',    dragClear.bind(null, fn));
}

function dragClear(fn) {
	window.removeEventListener('mousemove',  fn);
	window.removeEventListener('mouseleave', dragClear);
	window.removeEventListener('mouseup',    dragClear);
}

export default Vue.extend({
	props: ['data'],
	data() {
		return {
			viewBoxX: 140,
			viewBoxY: 60,
			zoom: 1,
			pos: 0,
			pointsPost: null,
			pointsReply: null,
			pointsRepost: null,
			pointsTotal: null
		};
	},
	created() {
		this.data.reverse();
		this.data.forEach(d => d.total = d.posts + d.replies + d.reposts);
		this.render();
	},
	methods: {
		render() {
			const peak = Math.max.apply(null, this.data.map(d => d.total));
			this.pointsPost = this.data.map((d, i) => `${(i * this.zoom) + this.pos},${(1 - (d.posts / peak)) * this.viewBoxY}`).join(' ');
			this.pointsReply = this.data.map((d, i) => `${(i * this.zoom) + this.pos},${(1 - (d.replies / peak)) * this.viewBoxY}`).join(' ');
			this.pointsRepost = this.data.map((d, i) => `${(i * this.zoom) + this.pos},${(1 - (d.reposts / peak)) * this.viewBoxY}`).join(' ');
			this.pointsTotal = this.data.map((d, i) => `${(i * this.zoom) + this.pos},${(1 - (d.total / peak)) * this.viewBoxY}`).join(' ');
		},
		onMousedown(e) {
			const clickX = e.clientX;
			const clickY = e.clientY;
			const baseZoom = this.zoom;
			const basePos = this.pos;

			// 動かした時
			dragListen(me => {
				let moveLeft = me.clientX - clickX;
				let moveTop = me.clientY - clickY;

				this.zoom = baseZoom + (-moveTop / 20);
				this.pos = basePos + moveLeft;
				if (this.zoom < 1) this.zoom = 1;
				if (this.pos > 0) this.pos = 0;
				if (this.pos < -(((this.data.length - 1) * this.zoom) - this.viewBoxX)) this.pos = -(((this.data.length - 1) * this.zoom) - this.viewBoxX);

				this.render();
			});
		}
	}
});
</script>

<style lang="stylus" scoped>
svg
	display block
	padding 10px
	width 100%
	cursor all-scroll

</style>