hello kitty stage 1 and 2 done

1 files changed, 31 insertions, 5 deletions

diff --git a/src/engine/vector.js b/src/engine/vector.js
index f596c51..739daaf 100644
--- a/src/engine/vector.js
+++ b/src/engine/vector.js
@@ -11,12 +11,17 @@ export class Vector {
 
     normalize() {
         if (this.x != 0 && 0 != this.y) {
-            let hyp = Math.abs(this.x)
-            let cSquared = Math.pow(hyp, 2) / 2
-            let c = Math.sqrt(cSquared, 2)
+            /* this is what it should be doing: */
+            // let hyp = Math.abs(this.x)
+            // let cSquared = Math.pow(hyp, 2) / 2
+            // let c = Math.sqrt(cSquared, 2)
 
-            this.x = this.x / Math.abs(this.x) * c
-            this.y = this.y / Math.abs(this.x) * c
+            // this.x = this.x / Math.abs(this.x) * c
+            // this.y = this.y / Math.abs(this.x) * c
+
+            /* but we need to save resources */
+            this.x = this.x / 4 * 3
+            this.y = this.y / 4 * 3
         }
     }
 
@@ -29,6 +34,13 @@ export class Vector {
         return new Vector(this.x, this.y)
     }
 
+    static substraction(vector_a, vector_b) {
+        return new Vector(
+            vector_a.x - vector_b.x,
+            vector_a.y - vector_b.y
+        )
+    }
+
     static division(vector_a, vector_b) {
         return new Vector(
             vector_a.x / vector_b.x,
@@ -41,4 +53,18 @@ export class Vector {
         this.y = Math.floor(this.y)
         return this
     }
+
+    toDeg() {
+        var angle = Math.atan2(this.y, this.x)   //radians
+        var degrees = 180*angle/Math.PI  //degrees
+        return (360+Math.round(degrees))%360 //round number, avoid decimal fragments
+    }
+
+    static fromDeg(degrees) {
+        let radians = degrees*Math.PI/180
+        return new Vector(
+            Math.cos(radians),
+            Math.sin(radians)
+        )
+    }
 }