Move utility functions into new file

src/util.js

@@ -0,0 +1,49 @@
+import {Point} from "pixi.js";
+
+export default {
+    getDistance(a, b) {
+        return Math.sqrt(Math.pow(a.x - b.x, 2) + Math.pow(a.y - b.y, 2))
+    },
+    getAngle(originX, originY, targetX, targetY) {
+        let dx = originX - targetX, dy = originY - targetY;
+
+        let theta = Math.atan2(dy, -dx); // [0, Ⲡ] then [-Ⲡ, 0]; anticlockwise; 0° = east
+        theta *= 180 / Math.PI;          // [0, 180] then [-180, 0]; anticlockwise; 0° = east
+        if (theta < 0) theta += 360;     // [0, 360]; anticlockwise; 0° = east
+
+        return theta;
+    },
+    /**
+     * Converts an angle in degrees to radians
+     * @param theta An angle in degrees.
+     * @returns {number} An angle in radians.
+     */
+    toRadians(theta) {
+        return theta / 180 * Math.PI;
+    },
+    /**
+     * Converts an angle in radians to degrees.
+     * @param theta An angle in radians.
+     * @returns {number} An angle in degrees.
+     */
+    toDegrees(theta) {
+        return theta / Math.PI * 180;
+    },
+    /**
+     * Generates a number of sections and returns basic generation data to assist initialization of the canvas.
+     * @param sectionCount The number of sections a 360 degree / 2pi area should be split up into.
+     * @returns {data} Returns an array of objects containing useful pre-generated angles & data.
+     */
+    generateSections(sectionCount) {
+        let data = [];
+        let baseAngle = (2 * Math.PI) / sectionCount;
+        for (let section = 0; section < sectionCount; section++) {
+            let startAngle = baseAngle * section;
+            let endAngle = startAngle + baseAngle;
+            let centerAngle = startAngle + (baseAngle / 2.0);
+            let velocityPoint = new Point(Math.cos(centerAngle), Math.sin(centerAngle));
+            data.push({startAngle, centerAngle, endAngle, velocityPoint});
+        }
+        return data;
+    }
+}