Mouse IPoint trigger

Unity Engine
1

Hello,

I have some code basic using the IPointHandler. I use the IPointEnterHandler to reset a entered flag then IPointDownHandler to set the button entered. The problem I have is sometimes with I toggle between two buttons with the script. It seem to unequip. For example, click A, B, A, B, if I click A again the item drops. I am assuming on OnPointerDown it saves the mouse location on OnPointerUp it just check if the mouse was up outside of the area. I don’t think it testing the RectTransform to the mouse position correctly. Additionally if I could check that properly, I wouldn’t need OnPointerClick.

Any thoughts.

Vivienne

// TerranPrime AR-548
// Space Survival Game
// Coded by Vivienne Anthony
//
// Spacd Survival Game
//
// For Protocol Seven Productions 2017
// Copyrighted(2017) All Rights Reserved
//

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class EquipButtonScript : MonoBehaviour, IPointerEnterHandler, IPointerExitHandler, IPointerClickHandler,IPointerDownHandler,IPointerUpHandler
{
    private Player m_Player;
    public int equipslot;

    private bool m_Dragging;

    private Rect m_Rect;
    private Vector3 m_LastTouch;
    private bool m_Entered;

    // Use this for initialization
    void Start ()
    {
        // Set m_player to null when starting
        m_Player = null;

        m_Dragging = false;

        RectTransform rectTransform = GetComponent<RectTransform> ();

        // get rectinformation
        m_Rect = RectTransformToScreenSpace (rectTransform);          

        m_Dragging = false;
    }


    // Set equip slot
    public void SetEquipSlot (int i)
    {
        // Set button equip slot to assigned slot
        equipslot = i;
    }

    // On pointer enter
    public void OnPointerEnter (PointerEventData eventData)
    {      
        // Reset enter flag
        m_Entered = false;
    }

    public void OnPointerDown (PointerEventData eventData)
    {  
        // Save mouse position  
        m_LastTouch = Input.mousePosition;

        // Set Enter flag
        m_Entered = true;
    }

// On Pointer up
    public void OnPointerUp (PointerEventData eventData)
    {        
        // Make sure the button was entered
        if (m_Entered == false)
            return;
            
        // Get Mouse Position
        Vector3 mousePosition = Input.mousePosition;

        // Check if the mouse position changed.
        if (m_LastTouch != mousePosition) {

            // calc mouse position
            mousePosition = Camera.main.ScreenToWorldPoint (new Vector3 (mousePosition.x, mousePosition.y, 0));

            mousePosition.x += Screen.width / 2;
            mousePosition.y += Screen.height / 2;

            Debug.Log ("x " + mousePosition.x + " " + m_Rect.x);
            Debug.Log ("y " + mousePosition.y + " " + m_Rect.y);

            // Check coordinate here
            if ((mousePosition.x < m_Rect.x - (m_Rect.size.x / 2) || mousePosition.x > m_Rect.x + (m_Rect.size.x / 2)) &&
                (mousePosition.y < m_Rect.y - (m_Rect.size.y / 2) || mousePosition.y > m_Rect.y + (m_Rect.size.y / 2))) {
            
                // UnEquip
                UnEquipMe ();
            } 

            // Reset flag
            m_Entered = false;
        } else {
            EquipMe ();
        }
        
    }

    public void OnPointerClick (PointerEventData eventData)
    {      
        // If click
        EquipMe ();

        // Reset entered flag
        m_Entered = false;
    }

    public static Rect RectTransformToScreenSpace (RectTransform transform)
    {
        Vector2 size = Vector2.Scale (transform.rect.size, transform.lossyScale);
        float x = transform.position.x + transform.anchoredPosition.x;
        float y = Screen.height - transform.position.y - transform.anchoredPosition.y;

        return new Rect (x, y, size.x, size.y);
    }
2

Could you explain what you’re trying to do ? Just a few “steps” about what you wish was happening…

3

I resolved it I think. Basically a UI interface area that contains a image with a button component. I can display four slots and equip a item that updates a area. Touching a area and dragging out, would unequip and drop the game object. Touching would simply equip a game object. Originally I was using the Button component to detect a click and calling a function. Also, I then tried just use the IPointClickHandler. Which failed.

// On pointer enter
    public void OnPointerEnter (PointerEventData eventData)
    {      
        // Reset enter flag
        m_Entered = false;
    }

    public void OnPointerDown (PointerEventData eventData)
    {  
        // Save mouse position  
        m_LastTouch = Input.mousePosition;

        // Set Enter flag
        m_Entered = true;
    }

    // On Pointer up
    public void OnPointerUp (PointerEventData eventData)
    {      
        // Make sure the button was entered
        if (m_Entered == false)
            return;
          
        // Get Mouse Position
        Vector3 mousePosition = Input.mousePosition;

        // Check if the mouse position changed.
        if (m_LastTouch != mousePosition) {

            // test drag out
            if (RectTransformUtility.RectangleContainsScreenPoint (
                    GetComponent<RectTransform> (), mousePosition, null
                ) == false) {
                Debug.Log ("DragOut");  
                UnEquipMe ();
            }
        } else {
            EquipMe ();
        }

        m_Entered = false;
      
    }

The solution was using the RectTransform component and passing the mouseposition to it. Rough version.

4

Okay, cool… if it’s resolved, I"m glad :slight_smile:

5

The start of this video shows what I mean.
https://www.youtube.com/watch?v=utWPjXr6LsQ

6

Cool :slight_smile: