Feature physics

CMPT306_Fall2017/Assets/Scripts/PlayerBehavior.cs

+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class PlayerBehavior : MonoBehaviour {
+
+    /* Movement to apply this frame */
+    private Vector3 frameMovement;
+
+    /* How much force is applied by player movement */
+    [SerializeField]
+    private float acceleration;
+
+    /* How much the velocity is scaled down on brake */
+    [SerializeField]
+    private float brakeFraction;
+    [SerializeField]
+    private float constantFraction;
+
+    /* The maximum speed a player is allowed to go */
+    [SerializeField]
+    private float maxSpeed;
+
+    /* Holds our plaayer and player body */
+    public GameObject player;
+    private Rigidbody2D playerBody;
+
+
+    /* Getters and Setters */
+    public float getMaxSpeed()
+    {
+        return maxSpeed;
+    }
+
+    /**
+     *  Collection of basic movement functions that add to a movement vector, which is 
+     *      reset every frame.
+     */
+    public void MoveLeft()
+    {
+        frameMovement.x -= acceleration;
+    }
+
+    public void MoveRight()
+    {
+        frameMovement.x += acceleration;
+    }
+
+    public void MoveUp()
+    {
+        frameMovement.y += acceleration;
+    }
+
+    public void MoveDown()
+    {
+        frameMovement.y -= acceleration;
+    }
+
+    /**
+     * Scale the player's velocity down, if brakeFraction is < zero 
+     */
+    public void Brake()
+    {
+        playerBody.velocity *= brakeFraction;
+    }
+
+
+    // Use this for initialization
+    void Start () {
+        playerBody = this.GetComponent<Rigidbody2D>();
+	}
+	
+	// Update is called once per frame
+	void Update () {
+        /* Accelerate the player with a movement vector based on this frames input */
+        playerBody.AddForce(frameMovement.normalized * acceleration);
+
+        /* Cap player speed with a velocity check */
+        if (playerBody.velocity.magnitude > maxSpeed)
+            playerBody.velocity = (playerBody.velocity.normalized * maxSpeed);
+        
+        /* Apply some simple friction */
+        playerBody.velocity *= constantFraction;
+
+        /* Reset any persistant variables */
+        frameMovement = Vector3.zero;
+	}
+}