Add a method

package.json

@@ -46,6 +46,7 @@
     "sanitize.css": "4.1.0",
     "string": "3.3.3",
     "uuid": "3.0.1",
+    "victor": "1.1.0",
     "vinyl-source-stream": "1.1.0",
     "watchify": "3.7.0"
   },

src/state-models/complex-apis.js

@@ -215,6 +215,9 @@ const computeTick = ({ allies, enemies, bullets, gameStatus }) => {
         }
 
         // TODO: 弾を発射する
+        //       - 発射点・着弾点の算出
+        //       - 行動から bullet state の生成
+        //       - 対象が範囲のときに unit の位置から着弾するマス目を逆算して算出
         // TODO: 対象が範囲の場合は範囲を持たす。
 
         // Comsume AP

src/state-models/location.js

@@ -9,6 +9,8 @@
 /** @module */
 const angles = require('angles');
 
+const { STYLES } = require('../immutable/constants');
+
 
 const createNewLocationState = (y, x) => {
   return { y, x };
@@ -24,6 +26,7 @@ const areSameLocations = (...locations) => {
 };
 
 /**
+ * Add any locations as vectors
  * @param {...State~Location} locations
  * @return {State~Location}
  */
@@ -37,6 +40,14 @@ const addLocations = (...locations) => {
   return createNewLocationState(y, x);
 };
 
+/**
+ * @param {...State~Location} squareLocation
+ * @return {State~Location}
+ */
+const calculateCenterOfSquare = (squareLocation) => {
+  return addLocations(squareLocation, createNewLocationState(STYLES.SQUARE_HEIGHT / 2, STYLES.SQUARE_WIDTH / 2));
+};
+
 /**
  * @param {State~Location} a
  * @param {State~Location} b
@@ -99,6 +110,7 @@ const performPseudoVectorAddition = (initial, terminal, scalar) => {
 module.exports = {
   addLocations,
   areSameLocations,
+  calculateCenterOfSquare,
   createNewLocationState,
   measureAngleWithTopAsZero,
   measureDistance,

test/state-models/location.js

@@ -3,6 +3,7 @@ const assert = require('power-assert');
 const {
   addLocations,
   areSameLocations,
+  calculateCenterOfSquare,
   createNewLocationState,
   measureAngleWithTopAsZero,
   measureDistance,
@@ -22,6 +23,12 @@ describe('state-models/location', () => {
     });
   });
 
+  describe('calculateCenterOfSquare', () => {
+    it('can execute correctly', () => {
+      assert.deepStrictEqual(calculateCenterOfSquare(_loc(0, 48)), _loc(24, 72));
+    });
+  });
+
   describe('areSameLocations', () => {
     it('can execute correctly', () => {
       assert.strictEqual(areSameLocations(_loc(0, 0), _loc(0, 0)), true);