Selection box - drawing corner issue.

Questions & Answers
1

Hello! So im trying to select objects with my selection box. The drawing part runs perfecly,but selection is not happening, if selection box wasnt drawn from an upper right corner.

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using RTS;
public class testSelectionBox : MonoBehaviour {

    public Texture2D texture;
    bool draw;
    
	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
    void Update()
    {

        if (Input.GetMouseButtonDown(0))
        {
            draw = true;
            rect = new Rect(Input.mousePosition.x, -(Input.mousePosition.y - Screen.height), 100, 100);

        }
        
            
        }
        if (Input.GetMouseButtonUp(0))
        {
            for (int i = 0; i < ResourceManager.playerUnits.Count; i++)
            {
                if (rect.Contains(WorldToGuiPoint(ResourceManager.playerUnits*.transform.position)))*

{

Debug.Log(playerUnits*.name);*
}
}

draw = false;
}
if (Input.GetMouseButton(0) && draw)
{
rect.xMax = Input.mousePosition.x;
rect.yMax = Screen.height-Input.mousePosition.y;

}
Debug.Log(rect);
}

void OnGUI()
{
if (draw)
{
GUI.DrawTexture(rect, texture);
}

}
public Vector3 WorldToGuiPoint(Vector3 position)
{
Vector3 guiPosition = Camera.main.WorldToScreenPoint(position);
guiPosition.y = Screen.height - guiPosition.y;

return guiPosition;
}
}

2

Fixed by using

Rect selectionBox = new Rect(Mathf.Min(startingCursorPos.x,  currentCursorPos.x), Mathf.Min(startingCursorPos.y,  currentCursorPos.y),
                              Mathf.Abs(startingCursorPos.x -  currentCursorPos.x),
                              Mathf.Abs(startingCursorPos.y -  currentCursorPos.y));

Thanks to selecting objects inside a box part2 - Unity Answers.