clean up code and add bullet class

src/index.js

@@ -2,16 +2,12 @@ import * as paper from "paper";
 
 let objects = [];
 
-class Asteroid{
-    constructor(size, position, velocity=new paper.Point(0, 0)){
+class Object{
+    constructor(size, position, velocity, path){
         this.size = size;
         this.position = position;
         this.velocity = velocity;
-        this.path = new paper.Path.RegularPolygon(this.position, Math.max(5, Math.ceil(Math.random()*10)), this.size);
-        this.path.segments.forEach(elem => {
-            elem.point = elem.point.add(new paper.Point(Math.random()*15, Math.random()*15));
-        });
-        this.path.strokeColor = "#ffffff";
+        this.path = path;
         objects.push(this);
     }
 
@@ -33,41 +29,52 @@ class Asteroid{
     }
 }
 
-class Ship{
+class Asteroid extends Object{
+    constructor(size, position, velocity=new paper.Point(0, 0)){
+        let path = new paper.Path.RegularPolygon(position, Math.max(5, Math.ceil(Math.random()*10)), size);
+        path.segments.forEach(elem => {
+            elem.point = elem.point.add(new paper.Point(Math.random()*15, Math.random()*15));
+        });
+        path.strokeColor = "#ffffff";
+        super(size, position, velocity, path);
+    }  
+}
+
+class Ship extends Object{
     constructor(size, position){
-        this.size = size;
-        this.position = position;
-        this.velocity = new paper.Point(0, 0);
-        this.nodes = [
-            new paper.Point(this.position.x, this.position.y-this.size),
-            new paper.Point(this.position.x+this.size/2, this.position.y),
-            new paper.Point(this.position.x-this.size/2, this.position.y),
-            new paper.Point(this.position.x, this.position.y-this.size) 
+        let nodes = [
+            new paper.Point(position.x, position.y-size),
+            new paper.Point(position.x+size/2, position.y),
+            new paper.Point(position.x-size/2, position.y),
+            new paper.Point(position.x, position.y-size) 
         ];
 
-        this.path = new paper.Path(this.nodes);
-        this.path.strokeColor = "#ffffff";
-        objects.push(this);
+        let path = new paper.Path(nodes);
+        path.strokeColor = "#ffffff";
+        path.fillColor = "#ffffffee";
+        
+        super(size, position, new paper.Point(0, 0), path);
+        this.forward = nodes[0].subtract(position);
     }
 
-    update(){
-        this.position = this.position.add(this.velocity);
-        this.path.position = this.position;
+    rotate(angle){
+        this.forward.angle += angle;
+        this.path.rotate(angle)
+    }
 
-        if(this.position.x > canvas.width + 30){
-            this.position = new paper.Point(-this.size,  this.position.y);
-        }else if(this.position.x < -this.size){
-            this.position = new paper.Point(canvas.width+this.size,  this.position.y);
-        }
-
-        if(this.position.y > canvas.height + 30){
-            this.position = new paper.Point(this.position.x,  -this.size);
-        }else if(this.position.y < -this.size){
-            this.position = new paper.Point(this.position.x,  canvas.height+this.size);
-        }
+    fire(){
+        new Bullet(this.position, this.forward);
     }
 };
 
+class Bullet extends Object{
+    constructor(position, velocity){
+        let path = new paper.Path.Circle(position, 3);
+        path.fillColor = "#ffffff";
+        super(3, position, velocity, path);
+    }
+}
+
 //initialization
 const canvas = document.getElementById("canvas");
 canvas.width = window.innerWidth;
@@ -89,12 +96,16 @@ const tool = new paper.Tool();
 
 tool.on("keydown", (event) => {
     if(event.character == "w"){
-        ship.velocity = ship.velocity.add(ship.nodes[0].subtract(new paper.Point(canvas.width/2, 0)).normalize());
+        ship.velocity = ship.velocity.add(ship.forward.normalize());
     }
 
     if(event.key == "right"){
-        ship.path.rotate(10);
+        ship.rotate(3);
     }else if(event.key == "left"){
-        ship.path.rotate(-10);
+        ship.rotate(-3);
+    }
+
+    if(event.key == "space"){
+        ship.fire();
     }
 });