[CODE]Keep Gameobject position exactly at mouse cursor when cast float position to int

Question

Hey everyone! I'm creating a 2d top-down game and currently im working on a script which should keep the Gameobject position exactly at the same position of the mouse, but it doesn't work. Maybe it's because I'm casting a float to an int, but I have seen other games where it works very well.

Problem: When I move the mouse very fast the object glitches from it's position

I hope anyone can help me!

 void Update ()
     {
         mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
 
         yMin = (int)playerRectAncor.transform.position.y - 1;
         yMax = (int)playerRectAncor.transform.position.y + 1;
         xMin = (int)playerRectAncor.transform.position.x - 1;
         xMax = (int)playerRectAncor.transform.position.x + 1;
 
         if (true) //Its just temporary true, for testing
         {
             pos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
             pos.z = transform.position.z;
             pos.x = Mathf.Clamp(pos.x, xMin, xMax);
             pos.y = Mathf.Clamp(pos.y, yMin, yMax);
            // put Object position to mousePosition
             rectObj.transform.position = new Vector3((int)pos.x, (int)pos.y, (int)pos.z);
         }

Answer 1

Answer by Neoletum · Jan 14, 2018 at 12:59 PM

Hey, thank you for your answer, it's difficult for me to describe my problem in english, maybe I described it bad, the point is that the game is tiled-base, and I'm casting it to an int because the whiteRect should only move in integers so the player can only build in a certain range around him.

In a nutshell, player should only be able to move the whiteRect in a 3x3 Range around his character otherwise he would be able to dig a hole out of his range^^ And moving the rect without casting it to an int seems not suitable to the kind of game im trying to create.

Here is a picture, it's like building in Stardew Valley:

alt text

@Bunny83 @RocketFriday @Orokon

problem2.png (121.0 kB)

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Neoletum · Jan 14, 2018 at 02:48 PM 1

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So, I found the answer, the Problem was that a cast doesnt round up like I expected it. When the number becomes negativ it rounds in an other way, like this:

(int)2.5 = 2 (int)(-2.5) = -2 but it has to become -3!

Solution: Using $$anonymous$$athf.Floor(-2.5) rounds up to -3 and everything works fine.

Thank you all!

Orokon · Jan 14, 2018 at 03:14 PM 0

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Thats what I tried to tell you. You are not rounding but casting so it cuts off the numbers after the dot. 2.1 becomes 2, -2.1 becomes -2. With the usage of floor you will run into other Problems. Look at how $$anonymous$$athf.Floor behaves:

 Debug.Log($$anonymous$$athf.Floor(10.0F)); // returns 10
 Debug.Log($$anonymous$$athf.Floor(10.2F)); // returns 10
 Debug.Log($$anonymous$$athf.Floor(10.7F)); // returns 10
 Debug.Log($$anonymous$$athf.Floor(-10.0F)); // returns -10
 Debug.Log($$anonymous$$athf.Floor(-10.2F)); // returns -11
 Debug.Log($$anonymous$$athf.Floor(-10.7F)); // returns -11

If that is what you want thats great, otherwise you should look at the rounding functions.

Also you should use FloorToInt ins$$anonymous$$d of Floor so you dont have to cast, because it returns an int

Neoletum Orokon · Jan 14, 2018 at 10:24 PM 0

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Yes, but it works now like I expected it, thank you for your hints, when you answer not as a comment I can accept your answer =)

@Orokon

[CODE]Keep Gameobject position exactly at mouse cursor when cast float position to int

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