Issue with referencing certain properties during events

Hey,

so this is rather hard to describe but please bear with me.

I am drawing a line from elements of type A to elements of type B in my project and after drawing, the B object saves the line as a property and the line knows where it's connected to. This is done mainly via OnMouseDown and OnMouseDrag on an A object. This works very well so far.

However, when releasing the mouse button and finishing drawing the line, OnMouseUp (which is in the A object) triggers obviously. BUT when this happens, I want to check a certain property of the B object.

More precisely, during OnMouseUp I want to check if there is a line already connected to the B object and if so, replace the line with the currently drawn line. Now the problem is that I have no idea how to check this in the script in the A object, especially in the OnMouseUp event.

Here's the code:

Class A:

Code (CSharp):

1.     GameObject line;
2.     Vector2[] tempEdges;
3.  
4.     void OnMouseDown () {
5.  
6.         // instantiate Line after clicking circle
7.         line = Instantiate (Resources.Load("Line")) as GameObject;
8.         Manager.currentlyDrawnLine = line.gameObject;
9.     }
10.  
11.     void OnMouseDrag () {
12.  
13.         if (!Manager.isMouseInsideCircle) {
14.             Vector2 screenPos = new Vector2 ();
15.             Camera.main.ScreenToWorldPoint (screenPos);
16.  
17.             line.GetComponent<LineRenderer> ().SetPosition (0,
18.                 new Vector3 (transform.position.x + (GetComponent<SpriteRenderer> ().bounds.size.x) / 2,
19.                     transform.position.y,
20.                     transform.position.z));
21.             line.GetComponent<LineRenderer> ().SetPosition (1, Camera.main.ScreenToWorldPoint (Input.mousePosition) + Vector3.forward * 10);
22.  
23.             tempEdges = line.GetComponent<EdgeCollider2D> ().points;
24.             tempEdges [0] = new Vector2 (
25.                 transform.position.x + (GetComponent<SpriteRenderer> ().bounds.size.x) / 2 - 0.7f,
26.                 transform.position.y - 0.217f);
27.             tempEdges [1] = new Vector2 (
28.                 (Camera.main.ScreenToWorldPoint (Input.mousePosition) + Vector3.forward * 10).x - 0.7f,
29.                 (Camera.main.ScreenToWorldPoint (Input.mousePosition) + Vector3.forward * 10).y - 0.217f);
30.  
31.             line.GetComponent<EdgeCollider2D> ().points = tempEdges;
32.         }
33.     }
34.  
35.     void OnMouseUp() {
36.  
37.     // Here is where I want to check if there is already a line connected to the B object
38.  
39.         }
40.         if (!Manager.currentlyDrawnLine.GetComponent<Line>().destinObject) {
41.             Destroy (Manager.currentlyDrawnLine);
42.         }
43.  
44.         Manager.currentlyDrawnLine = null;
45.     }

Class B:

Code (CSharp):

1.     public GameObject connectedLine;
2.     public bool isConnected = false;
3.  
4.     void Update() {
5.  
6. //        Debug.Log (Manager.currentlyDrawnLine);
7.  
8.         if (connectedLine) {
9.             GetComponent<SpriteRenderer> ().color = Color.green;
10.         } else {
11.             GetComponent<SpriteRenderer> ().color = Color.white;
12.         }
13.  
14.         Vector3 mousePos = Camera.main.ScreenToWorldPoint (Input.mousePosition);
15.         mousePos.z = 0;
16.  
17.         if (GetComponent<CircleCollider2D> ().bounds.Contains (mousePos)) {
18.             Manager.isMouseInsideCircle = true;
19.         } else if (!GetComponent<CircleCollider2D> ().bounds.Contains (mousePos)) {
20.             Manager.isMouseInsideCircle = false;
21.         }
22.          
23.         // If mouse inside circle and a line being drawn
24.         if (Manager.isMouseInsideCircle && Manager.currentlyDrawnLine) {
25.             Manager.currentlyDrawnLine.GetComponent<LineRenderer> ().SetPosition (1, this.transform.position);
26.  
27.             connectedLine = Manager.currentlyDrawnLine;
28.             connectedLine.GetComponent<Line> ().destinObject = this.gameObject;
29.  
30.             // If mouse not inside circle and a line being drawn
31.         } else if (!Manager.isMouseInsideCircle && Manager.currentlyDrawnLine) {
32.             if (connectedLine && !connectedLine.GetComponent<Line> ().isSnapped) {
33.                 if (connectedLine) {
34.                     connectedLine.GetComponent<Line> ().destinObject = null;
35.                 }
36.                 connectedLine = null;
37.             }
38.  
39.         }
40.     }

Manager class:

Code (CSharp):

1. public static class Manager {
2.  
3.     public static GameObject currentlyDrawnLine;
4.     public static bool isMouseInsideCircle = false;
5.     public static GameObject alreadyConnectedLine;
6.  
7. }

And you can find the repo here in case it helps: https://github.com/s0m3guy/MA_Sandbox

 

If I'm understanding correctly, we can click and drag the A objects in your project which connect to B objects with lines. Is this correct?

How do we know which B object we want to check? We should be able to generalize the answer to this into the answer to your question of how to check the B object.

Does it use the nearest B object? Is there only one B object?

 

You cannot drag the A objects, clicking them instantiates a line, which starts at this object and the end point follows the mouse while OnMouseDrag in order to then connect the line to an object of type B.

>How do we know which B object we want to check?

When I connect A with B I want to check if B already has a line connected to it. And B is also the object where I let go of the mouse button.

And in this part here I check if I collide with a certain B object:

In B class:

Code (CSharp):

1. if (GetComponent<CircleCollider2D> ().bounds.Contains (mousePos)) {
2.             Manager.isMouseInsideCircle = true;

And no there are several B objects

 

You could check for objects under the cursor when mouse is released using Camera.ScreenToWorldPoint and Physics2D.OverlapObject. If a B object is identified, you can access a script in that object to see what the values of its members are.

 

Ooh that sounds good! Not sure yet how to work these things in but I am trying