Merge pull request #3 from skyblockstats/auctions

Auction Prices

1 files changed, 138 insertions, 0 deletions

diff --git a/src/lib/AuctionPriceScatterplot.svelte b/src/lib/AuctionPriceScatterplot.svelte
new file mode 100644
index 0000000..6c59e70
--- /dev/null
+++ b/src/lib/AuctionPriceScatterplot.svelte
@@ -0,0 +1,138 @@
+<script lang="ts">
+	import { browser } from '$app/env'
+
+	import type { ItemAuctionsSchema, SimpleAuctionSchema } from './APITypes'
+	import type { PreviewedAuctionData } from './utils'
+
+	export let item: ItemAuctionsSchema
+	export let currentlyPreviewedAuction: PreviewedAuctionData | null
+
+	let svgEl: SVGElement
+	let maxCoins: number = item.auctions.reduce((max, auction) => Math.max(max, auction.coins), 0)
+	let currentTimestamp = Math.floor(Date.now() / 1000)
+	let earliestTimestamp = item.auctions.length > 0 ? item.auctions[0].ts : 0
+	let hoursBetween = (currentTimestamp - earliestTimestamp) / (60 * 60)
+	const gridWidth = 100 / hoursBetween
+
+	// this code is bad but it works
+	let heightCoinInterval = Math.ceil(Math.pow(10, Math.floor(Math.log10(maxCoins / 5))))
+	if (heightCoinInterval < maxCoins / 20) {
+		heightCoinInterval *= 5
+	} else if (heightCoinInterval < maxCoins / 10) {
+		heightCoinInterval *= 2
+	}
+	const gridHeight = 100 / (maxCoins / heightCoinInterval)
+
+	function getAuctionCoordinates(auction: SimpleAuctionSchema) {
+		const timestampPercentage =
+			(auction.ts - earliestTimestamp) / (currentTimestamp - earliestTimestamp)
+		return [timestampPercentage * 100, 100 - (auction.coins / maxCoins) * 100]
+	}
+
+	function updateNearest(e: MouseEvent) {
+		const rect = svgEl.getBoundingClientRect()
+
+		const mouseCoords = [e.clientX - rect.left, e.clientY - rect.top]
+		let nearestDistance = Number.MAX_SAFE_INTEGER
+		let nearestAuction: SimpleAuctionSchema | null = null
+		for (const auction of item.auctions) {
+			const auctionCoordsSvg = getAuctionCoordinates(auction)
+			const auctionCoords = [
+				(auctionCoordsSvg[0] * rect.width) / 100,
+				(auctionCoordsSvg[1] * rect.height) / 100,
+			]
+			const distance =
+				Math.pow(mouseCoords[0] - auctionCoords[0], 2) +
+				Math.pow(mouseCoords[1] - auctionCoords[1], 2)
+			if (distance < nearestDistance) {
+				nearestDistance = distance
+				nearestAuction = auction
+			}
+		}
+		if (nearestAuction) {
+			const [svgX, svgY] = getAuctionCoordinates(nearestAuction)
+			const [x, y] = [(svgX * rect.width) / 100, (svgY * rect.height) / 100]
+			if (currentlyPreviewedAuction?.auction.id === nearestAuction.id) return
+			currentlyPreviewedAuction = {
+				pageX: window.scrollX + rect.left + x,
+				pageY: window.scrollY + rect.top + y,
+				auction: nearestAuction,
+			}
+			for (const el of document.getElementsByClassName('selected-auction'))
+				el.classList.remove('selected-auction')
+			document
+				.getElementsByClassName(`auction-point-${nearestAuction.id}`)[0]
+				.classList.add('selected-auction')
+		} else {
+			currentlyPreviewedAuction = null
+		}
+	}
+
+	function shortenBigNumber(n: number) {
+		if (n < 1000) return n
+		if (n < 1_000_000) return parseFloat((n / 1000).toPrecision(2)).toLocaleString() + 'k'
+		if (n < 1_000_000_000) return parseFloat((n / 1_000_000).toPrecision(2)).toLocaleString() + 'M'
+		if (n < 1_000_000_000_000)
+			return parseFloat((n / 1_000_000_000).toPrecision(2)).toLocaleString() + 'B'
+	}
+</script>
+
+<svg viewBox="0 0 100 100" class="item-auction-history">
+	<defs>
+		<pattern
+			id="grid-{item.id}"
+			width={gridWidth}
+			height={gridHeight}
+			patternUnits="userSpaceOnUse"
+			x="0%"
+			y="100%"
+		>
+			<path
+				d="M {gridWidth} {gridHeight} L 0 {gridHeight} 0 0"
+				fill="none"
+				stroke="#fff2"
+				stroke-width="1"
+			/>
+		</pattern>
+	</defs>
+	{#each new Array(Math.floor(maxCoins / heightCoinInterval) + 1) as _, intervalIndex}
+		<text
+			x="-1"
+			y={Math.min(Math.max(5, 100 - intervalIndex * gridHeight + 2), 100)}
+			fill="var(--theme-darker-text)"
+			font-size="6px"
+			text-anchor="end">{shortenBigNumber(heightCoinInterval * intervalIndex)}</text
+		>
+	{/each}
+	<rect
+		width="100%"
+		height="100%"
+		fill="url(#grid-{item.id})"
+		on:mousemove={updateNearest}
+		bind:this={svgEl}
+	/>
+
+	{#each item.auctions as auction (auction.id)}
+		{@const [x, y] = getAuctionCoordinates(auction)}
+		<circle
+			cx={x}
+			cy={y}
+			r="1"
+			stroke-width="4"
+			fill={auction.bin ? '#11b' : '#1b1'}
+			class="auction-point-{auction.id}"
+		/>
+		<!-- class:selected-auction={currentlyPreviewedAuction?.auction?.id === auction?.id} -->
+	{/each}
+</svg>
+
+<style>
+	.item-auction-history {
+		height: 10em;
+		width: 100%;
+	}
+
+	svg :global(.selected-auction) {
+		stroke: #06e7;
+	}
+</style>