具有触摸位置Android的Unity 2D对象位置

Question

i have a problem here,

i have an object called projectile and i want make that projectile appear where i touch my phone with screen resolution 1090x1820 , my logic is :

#pragma strict

var projectile:Transform;
private var shoot:Transform;

function Start () {

}


function Update () { 

     for (var i = 0; i < Input.touchCount; ++i) {
         var touch:Touch = Input.GetTouch(i);
         if (touch.phase == TouchPhase.Began) {
            shoot = Instantiate(projectile) as Transform;
            shoot.position.x = touch.position.x;
            shoot.position.y = touch.position.y;
         }
     }
 }

This code work well, except the projectile doesn't appear at screen. Somehow, i try to put an object at unity editor and it's showing x = -2 and y = -1 or x =-1 and y =-5 and so on.I also try to Debug the touch position and it's showing x= 300 and y=90 etc.

How i can fix this ?

Sorry for my bad english !

Answer 1

Your problem is you are intermixing world coordinates with screen position. To fix that you'll need to use ScreenToWorldPoint so your code would look similar to:

    var worldPos : Vector3 = camera.ScreenToWorldPoint (touch.position));

    shoot.position.x = worldPos.x;

    shoot.position.y = worldPos.y;

This is untested code so use only for reference as it is there for you to understand the logic.