From 8aa6645f2311de78f74b35f804cc45c7fcf38f57 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Mon, 30 May 2022 18:19:02 -0500
Subject: add brushes

---
 src/BrushSelector.js | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/BrushSelector.js

(limited to 'src/BrushSelector.js')

diff --git a/src/BrushSelector.js b/src/BrushSelector.js
new file mode 100644
index 0000000..ea72990
--- /dev/null
+++ b/src/BrushSelector.js
@@ -0,0 +1,72 @@
+import { lerp } from './modules/Util.js';
+
+class BrushSelector {
+	constructor(rootId, canvas, terrain) {
+		console.log('hi');
+		this.canvas = canvas;
+		this.terrain = terrain;
+		this.div = document.createElement('div');
+		this.div.setAttribute('style', 'position: absolute; padding: 10px; display: block; right: 10px; bottom: 10px;');
+
+		this.radiusSlider = this.addSlider('Brush Size', 0, 500);
+		this.strengthSlider = this.addSlider('Brush Strength', 0, 100);
+
+		this.addBrush('Raise', (pt, str) => pt.height += 5 * str);
+		this.addBrush('Lower', (pt, str) => pt.height -= 5 * str);
+		this.addBrush('Round', (pt, str) => {
+			const neighbors = this.terrain.getNeighbors(pt);
+			let avg = 0;
+			for (let n of neighbors) avg += n.height;
+			avg /= neighbors.length;
+			pt.height = lerp(pt.height, avg, str);
+		});
+
+		const root = document.getElementById(rootId);
+		root.appendChild(this.div);
+	}
+
+	addSlider(label, min, max) {
+		const l = document.createElement('label');
+		const text = document.createTextNode(label);
+		l.appendChild(text);
+		this.div.appendChild(l);
+
+		const s = document.createElement('input');
+		s.type = 'range';
+		s.min = min;
+		s.max = max;
+		s.value = 0.5 * (max + min);
+		this.div.appendChild(s);
+		return s;
+	}
+
+	addBrush(name, f) {
+		const button = document.createElement('button');
+		const text = document.createTextNode(name);
+		button.appendChild(text);
+
+		button.onclick = () => {
+			if (this.button === button) return // already selected
+			if (this.button) this.button.classList.remove('selected');
+			button.classList.add('selected');
+			this.button = button;
+			this.f = f;
+		};
+
+		if (!this.button) button.onclick();
+
+		this.div.appendChild(button);
+	}
+
+	apply() {
+		const radius = this.radiusSlider.value;
+		const str = this.strengthSlider.value/this.strengthSlider.max;
+		this.terrain.applyBrush(
+			this.canvas.mouse.drawingPos.x,
+			this.canvas.mouse.drawingPos.y,
+			this.f, str, this.canvas.pixelsToUnits(radius)
+		);
+	}
+}
+
+export default BrushSelector;
-- 
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