Added reusable geometry functions and classes from several other projects

libs/bluemath.js

@@ -1,15 +1,127 @@
 // bluemath.js
 // This library adds advanced math objects
 
+function deg2rad (deg) {
+	return ((Math.PI*2)/360)*deg;
+}
+
+function rad2deg (rad) {
+	return (1/deg2rad(1))*rad;
+}
+
 class vector {
-	constructor(components) {
-		this.components = components;
+	constructor(dimentions=[0]) {
+		var me = this;
+		this.d = Array.isArray(dimentions) ? dimentions.map(d => !isNaN(d)) : [0];
+
+		if (me.d.length == 2) {
+			this.getRadAngle = function (vec) {
+				vec = vec instanceof vector ? vec : new vector([0,0]);
+				var xydims = vec.d.length == 2 ? vec.d : [...me.d.map((d,i) => vec[i] ? vec[i] : 0)];
+				return Math.atan2(xydims[1] - me.d[1], xydims[0] - me.d[0]);
+			}
+
+			this.getDegAngle = function (vec) {
+				return rad2deg(me.getRadAngle(vec));
+			}
+
+			this.resize = function (newLength) {
+				var angle = me.getDegAngle();
+				var soh = Math.sin(angle) * newLength;
+				var cah = Math.cos(angle) * newLength;
+				me.d = [cah,soh];
+			}
+
+		}
+	}
+
+	add(vec=new vector([...this.d.map(d => 0)]) {
+		vec = vec instanceof vector ? vec : new vector([0]);
+		var longest = vec.d.length > this.d.length ? vec.d : this.d;
+		var shortest = vec.d.length < this.d.length ? vec.d : this.d;
+		return new vector([...longest.map(function (value,index) { 
+			var small = shortest[index];
+			if !isNaN(small) { return value + small; } else { return value; }
+		})]);
+	}
+
+	mult(vec=new vector([...this.d.map(d => 1)])) {
+		vec = vec instanceof vector ? vec : new vector([0]);
+		var longest = vec.d.length > this.d.length ? vec.d : this.d;
+		var shortest = vec.d.length < this.d.length ? vec.d : this.d;
+		return new vector([...longest.map(function (value,index) {
+			var small = shortest[index];
+			if (!isNaN(small) { return value * small; } else { value; }
+		})]);
+	}
+	
+	mag(mult=1) {
+		mult = !isNaN(mult) ? mult : 1;
+		return this.mult(new vector([...this.d.map(d => mult)]));
+	}
+
+	square() {
+		return this.mult(this);
+	}
+
+	getDistance(origin = new vector([...this.d.map(d => 0)])) {
+		origin = origin instanceof vector ? origin : new vector([...this.d.map(d => 0)]);
+		return Math.sqrt(this.d.map(function (value, index) {
+			var ori = !isNaN(origin.d[index]) ? origin.d[index] : 0;
+			return Math.pow(ori - value, 2);
+		}).reduce((a,b) => a + b));
 	}
 }
 
-class tensor {
-	contructor(dimentions,rank) {
-		this.componants = Math.pow(rank,dimentions);
-		this.baseVectors = dimentions;
+function rad2vec (rad) {
+		var x = Math.cos(rad);
+		var y = Math.sin(rad);
+		return new vector([x,y]);
+}
+
+function deg2vec (deg) { //abstraction, really just for sanity
+		return rad2vec(deg2rad(deg));
+}
+
+function getAngle(ax,ay,bx,by) {
+		var deltaX = bx - ax;
+		var deltaY = by - ay;
+		return rad2deg(Math.atan2(deltaY,deltaX));
+}
+
+function reflect(inAngle,surfaceAngle) {
+		var normal = surfaceAngle+90;
+		var theta1 = normal - inAngle;
+		var theta2 = normal + theta1;
+		return theta2;	 
+}
+
+class bound {
+	constructor (min=[-Infinity],max=[Infinity]) {
+		// Insure both inputs are arrays with valid numbers
+ 		min = Array.isArray(min) ? min.map(value => !isNaN(value) ? value : -Infinity) : [-Infinity];
+		max = Array.isArray(max) ? max.map(value => !isNaN(value) ? value : -Infinity) : [Infinity];
+		// Insure both arrays are equal in size
+		while( min.length != max.length ) {
+			if (min.length > max.length) { max.push(Infinity); 
+		} else { min.push(-Infinity); }
+		}
+		// Accept filtered bounds
+		this.min = min;
+		this.max = max;
+	}
+
+	inbounds(valueArray=[...this.min.map(v => 0)]) {
+		if (valueArray.length != this.min.length) { return false }
+		return valueArray.map((value,index) => (value >= this.min[index]) && (value <= this.max[index])).reduce((a,b) => a && b);
+	}
+
+	normalize(valueArray=[...this.min.map(v => 0)]) {
+		if (valueArray.length != this.min.length) { return [...this.min.map(v => 0)]; }
+		return valueArray.map((value,index) => (value - this.min[index])/(this.max[index] - this.min[index]));
+	}																																			
+	clamp(valueArray=[...this.min.map(v => 0)]) {
+		if (valueArray.length != this.min.length) { return [...this.min.map((v,i) => Math.min(Math.max(0, v), this.max[i]))]; }
+		return valueArray.map((value,index) => Math.min(Math.max(value,this.min[index]),this.max[index]));
 	}
 }