init

pt.js

@@ -0,0 +1,61 @@
+class Point {
+	constructor(x, y) {
+		this.x = x
+		this.y = y
+	}
+
+	equals(pt) { return this.x == pt.x && this.y == pt.y }
+	isIn(arr) { return this.indexIn(arr) != -1 }
+	indexIn(arr) { return arr.findIndex((pt) => this.equals(pt)) }
+	lastIndexIn(arr) { return arr.findLastIndex((pt) => this.equals(pt)) }
+
+	up() { return new Point(this.x, this.y - 1) }
+	down() { return new Point(this.x, this.y + 1) }
+	left() { return new Point(this.x - 1, this.y) }
+	right() { return new Point(this.x + 1, this.y) }
+	upleft() { return new Point(this.x - 1, this.y - 1) }
+	upright() { return new Point(this.x + 1, this.y - 1) }
+	downleft() { return new Point(this.x - 1, this.y + 1) }
+	downright() { return new Point(this.x + 1, this.y + 1) }
+
+	u() { return this.up() }
+	d() { return this.down() }
+	l() { return this.left() }
+	r() { return this.right() }
+	ul() { return this.upleft() }
+	ur() { return this.upright() }
+	dl() { return this.downleft() }
+	dr() { return this.downright() }
+
+	getUnfilteredAdjNeighbors() { return [this.u(), this.l(), this.r(), this.d()] }
+	getUnfilteredDiagNeighbors() { return [this.ul(), this.ur(), this.dl(), this.dr()] }
+	getUnfilteredAllNeighbors() { return [...this.getUnfilteredAdjNeighbors(), ...this.getUnfilteredDiagNeighbors()] }
+
+	add(pt) { return new Point(this.x + pt.x, this.y + pt.y) }
+	addMut(pt) {
+		this.x += pt.x
+		this.y += pt.y
+		return this
+	}
+
+	sub(pt) { return new Point(this.x - pt.x, this.y - pt.y) }
+	subMut(pt) {
+		this.x -= pt.x
+		this.y -= pt.y
+		return this
+	}
+
+	squaredMag() { return this.x * this.x + this.y * this.y }
+	mag() { return Math.sqrt(this.squaredMag()) }
+
+	squaredDist(pt) { return this.sub(pt).squaredMag() }
+	dist(pt) { return this.sub(pt).mag() }
+	
+	readingOrderCompare(pt) { return this.y < pt.y ? -1 : this.y > pt.y ? 1 : this.x < pt.x ? -1 : this.x > pt.x ? 1 : 0 }
+
+	copy() { return new Point(this.x, this.y) }
+	toString() { return this.x + "," + this.y }
+}
+
+Pt = Point
+