koobas.hobune.stream
RTS Click Drag Selection box not working with GUI canvas
I need help with a drag select box I've made; the problem is when I click and drag with no GUI canvas obstructing the camera the click drag works perfectly but when I click and drag with the GUI canvas in the way it doesn't work at all. How could I get the click drag box to ignore the GUI canvas and still work even though the GUI canvas is still on? Thanks!
This is the Selecting Unit (Drag box) script:
using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class SelectUnit : MonoBehaviour {
public GameObject selectedunit;
public List<GameObject> selectedunits = new List<GameObject>();
RaycastHit hit;
private Vector3 MouseDownPoint, CurrentDownPoint;
public bool IsDragging;
private float BoxWidth, BoxHeight, BoxLeft, BoxTop;
private Vector2 BoxStart, BoxFinish;
public List<GameObject> UnitsOnScreenSpace = new List<GameObject>();
public List<GameObject> UnitInDrag = new List<GameObject>();
void OnGUI()
{
if(IsDragging)
{
GUI.Box(new Rect(BoxLeft, BoxTop, BoxWidth, BoxHeight), "");
}
}
void LateUpdate()
{
UnitInDrag.Clear();
if(IsDragging && UnitsOnScreenSpace.Count > 0)
{
selectedunit = null;
for (int i = 0; i < UnitsOnScreenSpace.Count; i++)
{
GameObject UnitObj = UnitsOnScreenSpace[i] as GameObject;
Unit PosScript = UnitObj.transform.GetComponent<Unit>();
GameObject selectmarker = UnitObj.transform.Find("Marker").gameObject;
if(!UnitInDrag.Contains(UnitObj))
{
if (UnitWithinDrag(PosScript.ScreenPos))
{
selectmarker.SetActive(true);
UnitInDrag.Add(UnitObj);
}
else
{
if (!UnitInDrag.Contains(UnitObj))
selectmarker.SetActive(false);
}
}
}
}
}
void Update () {
if (Input.GetMouseButton(0))
{
if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 100))
{
if(hit.transform.tag != "SelectableUnit")
{
if(CheckIfMouseIsDragging())
{
IsDragging = true;
}
}
}
}
if(Input.GetMouseButtonUp(0))
{
PutUnitsFromDragIntoSelectedUnits();
IsDragging = false;
}
if (selectedunit == null)
{
if (Input.GetMouseButtonDown(0))
{
if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 100))
{
if (hit.transform.tag == "SelectableUnit")
{
selectedunit = hit.transform.gameObject;
selectedunit.transform.FindChild("Marker").gameObject.SetActive(true);
for (int i = 0; i < selectedunits.Count; i++)
{
selectedunits[i].transform.FindChild("Marker").gameObject.SetActive(false);
}
selectedunits.Clear();
}
if(hit.transform.tag == "Floor")
{
for (int i = 0; i < selectedunits.Count; i++)
{
selectedunits[i].transform.FindChild("Marker").gameObject.SetActive(false);
}
selectedunits.Clear();
}
}
}
}
else
{
if (Input.GetMouseButtonDown(0) && !Input.GetKey(KeyCode.LeftShift) && !Input.GetKey(KeyCode.RightShift))
{
if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 100))
{
if (hit.transform.tag == "SelectableUnit")
{
selectedunit.transform.FindChild("Marker").gameObject.SetActive(false);
selectedunit = null;
selectedunit = hit.transform.gameObject;
selectedunit.transform.FindChild("Marker").gameObject.SetActive(true);
}
if (hit.transform.tag == "Floor")
{
selectedunit.transform.FindChild("Marker").gameObject.SetActive(false);
selectedunit = null;
}
}
}
}
//ADD If shift is down already do this later..
if (Input.GetMouseButtonDown(0) && Input.GetKey(KeyCode.LeftShift) || Input.GetKey(KeyCode.RightShift))
{
if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 100))
{
if (hit.transform.tag == "SelectableUnit")
{
if(selectedunit != null)
{
selectedunits.Add(selectedunit);
selectedunit = null;
}
selectedunits.Add(hit.transform.gameObject);
for (int i = 0; i < selectedunits.Count; i++)
{
selectedunits[i].transform.FindChild("Marker").gameObject.SetActive(true);
}
}
}
}
if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 100))
CurrentDownPoint = hit.point;
if(Input.GetMouseButtonDown(0))
{
if (Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hit, 100))
MouseDownPoint = hit.point;
}
if(IsDragging)
{
Debug.Log ("Dragging");
BoxWidth = Camera.main.WorldToScreenPoint(MouseDownPoint).x - Camera.main.WorldToScreenPoint(CurrentDownPoint).x;
BoxHeight = Camera.main.WorldToScreenPoint(MouseDownPoint).y - Camera.main.WorldToScreenPoint(CurrentDownPoint).y;
BoxLeft = Input.mousePosition.x;
BoxTop = (Screen.height - Input.mousePosition.y) - BoxHeight;
if(BoxWidth > 0f && BoxHeight < 0f)
{
BoxStart = new Vector2(Input.mousePosition.x, Input.mousePosition.y);
}
else if (BoxWidth > 0f && BoxHeight > 0f)
{
BoxStart = new Vector2(Input.mousePosition.x, Input.mousePosition.y + BoxHeight);
}
else if (BoxWidth < 0f && BoxHeight < 0f)
{
BoxStart = new Vector2(Input.mousePosition.x + BoxWidth, Input.mousePosition.y);
}
else if (BoxWidth < 0f && BoxHeight > 0f)
{
BoxStart = new Vector2(Input.mousePosition.x + BoxWidth, Input.mousePosition.y + BoxHeight);
}
BoxFinish = new Vector2(BoxStart.x + Unsigned(BoxWidth), BoxStart.y - Unsigned(BoxHeight));
}
}
float Unsigned(float val)
{
if (val < 0f)
val *= -1;
return val;
}
private bool CheckIfMouseIsDragging()
{
if (CurrentDownPoint.x - 2 >= MouseDownPoint.x || CurrentDownPoint.y - 2 >= MouseDownPoint.y || CurrentDownPoint.z - 2 >= MouseDownPoint.z ||
CurrentDownPoint.x < MouseDownPoint.x - 2 || CurrentDownPoint.y < MouseDownPoint.y - 2 || CurrentDownPoint.z < MouseDownPoint.z - 2)
return true;
else
return false;
}
public bool UnitWithinScreenSpace(Vector2 UnitScreenPos)
{
if ((UnitScreenPos.x < Screen.width && UnitScreenPos.y < Screen.height) && (UnitScreenPos.x > 0f && UnitScreenPos.y > 0f))
return true;
else
return false;
}
public bool UnitWithinDrag(Vector2 UnitScreenPos)
{
if ((UnitScreenPos.x > BoxStart.x && UnitScreenPos.y < BoxStart.y) && (UnitScreenPos.x < BoxFinish.x && UnitScreenPos.y > BoxFinish.y))
return true;
else
return false;
}
public void PutUnitsFromDragIntoSelectedUnits()
{
if(UnitInDrag.Count > 0)
{
for (int i = 0; i < UnitInDrag.Count; i++)
{
if (!selectedunits.Contains(UnitInDrag[i]))
selectedunits.Add(UnitInDrag[i]);
}
}
UnitInDrag.Clear();
}
}
Best Answer
Have you considered using a Canvas Group?
https://docs.unity3d.com/460/Documentation/Manual/class-CanvasGroup.html
It would give you access to a variable called blocksRaycasts
https://docs.unity3d.com/460/Documentation/ScriptReference/CanvasGroup.html https://docs.unity3d.com/460/Documentation/ScriptReference/CanvasGroup-blocksRaycasts.html
That way you could set the Canvas to ignore raycasts so they still hit the ground.
public bool blocksRaycasts;
