Point to click movement in a 2d game

[blackexile]

Hello. I have been looking for a way to move a game object based on a mouse click.
Any help at this point would be appreciated.

[MD_Reptile]

Well. In 3D you could raycast down from mouse click to hit a collider, and determine stuff from there - but now with 2D I think it actually will need to be done differently.

I am not sure off the top of my head how a basic implementation would be done, but some more info would probably help others to help you:

• is it a “top-down” or “side-scroller” game?
• using all 2d physics I’m guessing?
• have you tried anything already?

Anyway if I come up with an idea I’ll be sure to post about it.

[MD_Reptile]

@blackexile

You’re going to want to make sure that both the actorObject’s coordinates and the mouse coords are occupying the same coordinate space. Input.mousePosition returns screen coordinates and your game actors position will be in world coordinates. So I imagine you’re going to want to either do a raycast against a plane established from your character with Camera.ScreenPointToRay or you’re just going to want to translate the screen coordinates to world coords with Camera.ScreenToWorldPoint. I’m not entirely sure what your game looks like so I can’t really say what will give you the coordinates you want as lots of people say they are making a “2d” game but are actually using all 3 dimension of depth inside the engine and just restricting character and object motion to two axes.

Once you’re gotten the cursors position in world space coordinates you should be able originate objects from the transform of the players character object and throw them and the location of the cursor.

(FROM: Find Mouse co-ordinates on click in a 2d environment - Questions & Answers - Unity Discussions )

If you read about that to grasp the idea, then take mouse position, compare to your characters position, and decide movement based on that.

Good luck!

PS my bad didn’t mean to double post, meant to edit…

[imgodot]

Black,
Here’s what I did (note: this is for C#):

// Define a variable vector for the position you will want the object to move to.
Vector3 wantedPos;
// Get the position of the mouse click.
Vector3 mousePos = Input.mousePosition;
// Transmogrify the mouse coordinates to the coordinate system of your game space.
wantedPos = Camera.main.ScreenToWorldPoint (new Vector3 (mousePos.x, mousePos.y, 1f));
// Determine the vector from your desired (ending) position and the game objects current position.
Vector3 relativePos = wantedPos - transform.position ;
// Move your game object using a rigid body force to get it moving in the right direction.
transform.rigidbody2D.AddForce(relativePos.normalized * 40f);

Instead of doing the AddForce, you could also use iTween; it’s a free download.
Then you can do something like this: iTween.MoveTo(gameObject,wantedPos,2);
That will cause a game object to move to the desired location in 2 seconds.

Hope this helps.
I’m struggling with this stuff too.

– Paul

[pKallv]

@imgodot

Black,
Here’s what I did (note: this is for C#):

// Define a variable vector for the position you will want the object to move to.
Vector3 wantedPos;
// Get the position of the mouse click.
Vector3 mousePos = Input.mousePosition;
// Transmogrify the mouse coordinates to the coordinate system of your game space.
wantedPos = Camera.main.ScreenToWorldPoint (new Vector3 (mousePos.x, mousePos.y, 1f));
// Determine the vector from your desired (ending) position and the game objects current position.
Vector3 relativePos = wantedPos - transform.position ;
// Move your game object using a rigid body force to get it moving in the right direction.
transform.rigidbody2D.AddForce(relativePos.normalized * 40f);

Instead of doing the AddForce, you could also use iTween; it’s a free download.
Then you can do something like this: iTween.MoveTo(gameObject,wantedPos,2);
That will cause a game object to move to the desired location in 2 seconds.

Hope this helps.
I’m struggling with this stuff too.

– Paul

great answer

[zedzag]

indeed, a very helpful answer

[atahhh]

if you have the object in the screen and you want it to move to anyplace you mousepress just give the object a 3d collider and make the collider big enough to cover the screen (dont use it as a trigger ) and if you ot onMousePressed working it will transport the object to the clicking position