GUI Box to draw Target Lock Icon

Questions & Answers
1

Hi,

I planned to use OnGUI function to draw “Target Lock” icon on incoming rockets for FPS game.

alt text

this is just an example

Requirement:

  1. able to expand in size if the rocket comes near

  2. able to track rocket using WorldToScreenPoint function

Any idea on how to do it? Thanks!

2

You can increase the size of the target lock icon by using 

var size = 1/Vector3.Distance(player.transform.position, enemy.transform.position)

It will now increase as the enemy gets closer and decrease as it gets further away

For the tracking bit, use:

var position = Data.cam.camera.WorldToScreenPoint (enemies[e].position);
position.y = Screen.height - position.y;
GUI.DrawTexture(Rect((position.x - (size/2)), (position.y - (size/2)), size, targetSize), texture);

And there you have it :slight_smile:

P.S. you’ll probably need to multiply the ‘size’ variable by a number so that the target lock icon doesn’t increase or decrease too quickly