[RESOLVED]Recangle image selection around object

Unity Engine
1

Hi,

I’m trying to achieve a rectangle image selection like this :


Basically when you look at an object a recangle is drawn around it using the bounds size.

After some research I come accross this : http://answers.unity3d.com/questions/292031/how-to-display-a-rectangle-around-a-player.html?sort=oldest

It use legacy GUI but works well, I tried to make it work with the new UI but it’s always miss place or kind of offested.


Tested with Overlay, Camera and World space canvas, I got same result.

And the code I used :

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class TestImageRect : MonoBehaviour
{

    public Image boundsTest;
    private Vector3[] pts = new Vector3[8];
    Renderer renderer;

    void Awake ()
    {
        renderer = GetComponent<Renderer> ();
    }

    void Update ()
    {
        Bounds b = renderer.bounds;
        Camera cam = Camera.main;
       
        //The object is behind us
        if (cam.WorldToScreenPoint (b.center).z < 0) return;
       
        //All 8 vertices of the bounds
        pts[0] = cam.WorldToScreenPoint (new Vector3 (b.center.x + b.extents.x, b.center.y + b.extents.y, b.center.z + b.extents.z));
        pts[1] = cam.WorldToScreenPoint (new Vector3 (b.center.x + b.extents.x, b.center.y + b.extents.y, b.center.z - b.extents.z));
        pts[2] = cam.WorldToScreenPoint (new Vector3 (b.center.x + b.extents.x, b.center.y - b.extents.y, b.center.z + b.extents.z));
        pts[3] = cam.WorldToScreenPoint (new Vector3 (b.center.x + b.extents.x, b.center.y - b.extents.y, b.center.z - b.extents.z));
        pts[4] = cam.WorldToScreenPoint (new Vector3 (b.center.x - b.extents.x, b.center.y + b.extents.y, b.center.z + b.extents.z));
        pts[5] = cam.WorldToScreenPoint (new Vector3 (b.center.x - b.extents.x, b.center.y + b.extents.y, b.center.z - b.extents.z));
        pts[6] = cam.WorldToScreenPoint (new Vector3 (b.center.x - b.extents.x, b.center.y - b.extents.y, b.center.z + b.extents.z));
        pts[7] = cam.WorldToScreenPoint (new Vector3 (b.center.x - b.extents.x, b.center.y - b.extents.y, b.center.z - b.extents.z));
       
        //Get them in GUI space
        for (int i=0;i<pts.Length;i++) pts[i].y = Screen.height-pts[i].y;
       
        //Calculate the min and max positions
        Vector3 min = pts[0];
        Vector3 max = pts[0];
        for (int i=1;i<pts.Length;i++) {
            min = Vector3.Min (min, pts[i]);
            max = Vector3.Max (max, pts[i]);
        }

        Rect r = Rect.MinMaxRect (min.x,min.y,max.x,max.y);
       
        boundsTest.rectTransform.offsetMax = max;
        boundsTest.rectTransform.offsetMin = min;
    }
}

If someone could help me on this that would be amazing.

Thanks!

2

Well, I think I may have fixed it.

Solution was anchors and this line :

for (int i=0;i<pts.Length;i++) pts[i].y = Screen.height-pts[i].y;

I just removed this from the code.

And used bottom left Anchor.