From abcde26ef403505efd745b6f5e16f2a76fa99c68 Mon Sep 17 00:00:00 2001
From: Robert Bendun <robert@bendun.cc>
Date: Tue, 27 Apr 2021 10:05:47 +0200
Subject: [PATCH] Forgot to add costMap to commit xD

---
 src/logic/costMap.js | 78 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 src/logic/costMap.js

diff --git a/src/logic/costMap.js b/src/logic/costMap.js
new file mode 100644
index 0000000..5419f3e
--- /dev/null
+++ b/src/logic/costMap.js
@@ -0,0 +1,78 @@
+const MaxCostPoints = 3;
+const MaxCostSpreadRadius = 5;
+
+class CostMap {
+	static instance
+
+	constructor() {
+		CostMap.instance = this;
+		this.compute()
+	}
+
+	getCostAt(x, y) {
+		return this.values[y * 20 + x]
+	}
+
+	compute() {
+		this.values = [...Array(20 * 9)].map(_ => 0);
+
+		const {floor, random, PI, sin, cos} = Math
+		for (let i = 0; i < MaxCostPoints; ++i) {
+			const x = floor(random() * 20);
+			const y = floor(random() * 9);
+
+			this.values[y * 20 + x] = 1;
+
+			for (let theta = 0; theta < PI * 2; theta += 0.1) {
+				for (let rbase = 1; rbase < MaxCostSpreadRadius; ++rbase) {
+					const r = Math.cbrt(Math.random()) * rbase;
+					const cx = floor(cos(theta) * r + (x + 0.5));
+					const cy = floor(sin(theta) * r + (y + 0.5));
+
+					if (cx >= 0 && cx <= 20 && cy >= 0 && cy <= 9 && this.values[cy * 20 + cx] == 0)
+						this.values[cy * 20 + cx] = 1 - (rbase / MaxCostSpreadRadius);
+				}
+			}
+		}
+	}
+}
+
+class CostMapVisualisation {
+	static instance
+
+	constructor(canvas) {
+		this.canvas = canvas
+		this.ctx = canvas.getContext('2d');
+		canvas.width = 2000
+		canvas.height = 900
+
+		CostMapVisualisation.instance = this
+
+		document.addEventListener('keydown', ({ key }) => {
+			if (key !== 'c')
+				return
+
+			if (this.hasBeenUpdated) {
+				this.ctx.clearRect(0, 0, 2000, 900);
+			} else {
+				this.update();
+			}
+
+			this.hasBeenUpdated = !this.hasBeenUpdated
+		})
+	}
+
+	update() {
+		CostMap.instance.values.forEach((cost, i) => {
+			const y = Math.floor(i / 20) * 100;
+			const x = (i % 20) * 100;
+
+			let color = Math.floor((cost * 255)).toString(16)
+			if (color.length == 1)
+				color = "0" + color
+
+			this.ctx.fillStyle = '#' + color + color + color;
+			this.ctx.fillRect(x, y, 100, 100)
+		})
+	}
+}