5 ViewPortToWorldPoint()

Author: rickdavidson

Laser Defender/Assets/Scripts/Player.cs

@@ -1,27 +1,44 @@
-using System.Collections;
+using System;
+using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Player : MonoBehaviour {
 
     [SerializeField] float moveSpeed = 10f;
+    [SerializeField] float padding = 1f;
 
-	// Use this for initialization
-	void Start () {
-		
+    float xMin;
+    float xMax;
+    float yMin;
+    float yMax;
+
+    // Use this for initialization
+    void Start () {
+        SetUpMoveBoundaries();
 	}
-	
-	// Update is called once per frame
-	void Update () {
+
+    private void SetUpMoveBoundaries()
+    {
+        Camera gameCamera = Camera.main;
+        xMin = gameCamera.ViewportToWorldPoint(new Vector3(0, 0, 0)).x + padding;
+        xMax = gameCamera.ViewportToWorldPoint(new Vector3(1, 0, 0)).x - padding;
+        yMin = gameCamera.ViewportToWorldPoint(new Vector3(0, 0, 0)).y + padding;
+        yMax = gameCamera.ViewportToWorldPoint(new Vector3(0, 1, 0)).y - padding;
+    }
+
+    // Update is called once per frame
+    void Update () {
         Move();
 	}
 
     private void Move()
     {
         var deltaX = Input.GetAxis("Horizontal") * Time.deltaTime * moveSpeed;
-        var newXPos = transform.position.x + deltaX;
         var deltaY = Input.GetAxis("Vertical") * Time.deltaTime * moveSpeed;
-        var newYPos = transform.position.y + deltaY;
+
+        var newXPos = Mathf.Clamp(transform.position.x + deltaX, xMin, xMax);
+        var newYPos = Mathf.Clamp(transform.position.y + deltaY, yMin, yMax);
         transform.position = new Vector2(newXPos, newYPos);
     }
 

README.md

@@ -59,4 +59,16 @@ Create our project and be happy with the aspect ratio, sizes and proportions.
 3. Also add vertical movement for the player.
 
 **After watching (learning outcomes)…**
-Move your player ship in a way which is frame rate independent.
+Move your player ship in a way which is frame rate independent.
+
+
+### 5 ViewPortToWorldPoint() ###
+
+**In this video (objectives)…**
+
+1. Construct our gameplay boundaries using the method ViewPortToWorldPoint().
+2. Clamp our horizontal and vertical movement based upon our boundaries.
+3. Add padding so that the player does not go off screen.
+
+**After watching (learning outcomes)…**
+Limit your player's ship movement based upon relative camera space.