selecting objects inside a box part2

Question

I want to select all the objects inside of a RTS style selection box.

Since I have originalmousePosition and currentMousePosition, Im looping though all the units and converting there coordinates to screen coordinates. From there Im testing weather the screen coordinates are located inside the box I drew. If the units are inside the box, it selects them.

I believe my code is "generally" right, but I dont think i have my bounds set up to represent the area inside the box. Any help please?

 public static void selectMultipleObjects(Vector2 originalPos, Vector2 currentPos)
 {
     foreach(GameObject go in movableObjectsList) //represents all the movable units
     {
         var screenCoordinates = Camera.main.WorldToScreenPoint(go.transform.position);//convert the current object position to screen coordinates
         
         //Find all the objects inside the box
         if((screenCoordinates.x < originalPos.x && screenCoordinates.x > currentPos.x) && (screenCoordinates.y > originalPos.y && screenCoordinates.y < currentPos.y))
         {
             if(!DoesObjectExistInList(movableObjectsList, go))
             {
                 SelectedObjects.Add(go);
             }
         }
     }
 }

Answer 1

Best Answer

Answer by kevork · Sep 20, 2011 at 03:41 PM

Unity has support for boxes with Rect. Assuming originalPos and currentPos are the corners of your selection box, you can build your box with:

 Rect selectionBox = new Rect(Mathf.Min(originalPos.x, currentPos.x)), Mathf.Min(originalPos.y, currentPos.y),
                              Mathf.Abs(originalPos.x - currentPos.x),
                              Mathf.Abs(originalPos.y - currentPos.y));

Then you can replace your if statement with:

 if(selectionBox.Contains(screenCoordinates))

And you should be good to go.

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michael 4 · Sep 20, 2011 at 04:02 PM 0

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Perfect!!!

Answer 2

Answer by dragologic · Oct 28, 2012 at 05:11 PM

I think y should be inverted like this: Rect selectionBox = new Rect(Mathf.Min(originalPos.x, currentPos.x)),
Screen.height - Mathf.Max(originalPos.y, currentPos.y), Mathf.Abs(originalPos.x - currentPos.x), Mathf.Abs(originalPos.y - currentPos.y));

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selecting objects inside a box part2

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