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Question by MuradD · Feb 29, 2016 at 12:22 PM · 2d2d game2d-gameplay2d rotation

clamp position 1/4 of a circle 2D

I want to Make script where 2D object moves in 1/4th of a circle, Quarter 1 of a circle. with maximum distance is 4.0f for example.

what I could do 2D java script not much.

 private var pos : Vector2;
 var cannons : Transform;
 var maxDistance : float = 4.0f;
 
     function Start () {
     
     }
     
     function Update () {
         var dist = Vector2.Distance(cannons.position, transform.position);
         if(maxDistance < dist){
             dist = maxDistance;
         }
         print ("Distance to other: " + dist);
         if (Input.touchCount > 0){
             pos = Camera.main.ScreenToWorldPoint (Vector2 (Input.GetTouch(0).position.x, Input.GetTouch(0).position.y));
             pos.x = Mathf.Clamp(pos.x,-8.5,-4.5);
             pos.y = Mathf.Clamp(pos.y,-2.25,1.75);
                 transform.position = new Vector2(pos.x, pos.y);
            }
     }

description of the issue heart smiley face and star

-heart must move inside the 1/4 of the circle freely
-if touch position is outside the circle zone it must move to closest position to that touch position (star)
- the center of the movement must be smiley face clearly.

i tried many solutions but all had errors probably it was my mistake as I am new to the awesome Unity3d scripting.

heart-range.jpg (21.8 kB)
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Answer by MuradD · Mar 14, 2016 at 09:37 AM

I solved this issue and here is my code;

 using UnityEngine;
 using System.Collections;
 
 public class CorsairMover : MonoBehaviour {
 
 
     RaycastHit hit;
     public Transform Tank;
     public Transform corsair;
     //private Transform temp;
     float TankX;
     float TankY;
     float TankX2;
     float TankY2;
 
     void Start () {
         TankX = Tank.position.x;
         TankY = Tank.position.y;
         TankX2 = TankX + 4;
         TankY2 = TankY + 4;
     }
     void Update () {
          Ray2D x = new Ray2D(Tank.position, Input.mousePosition - Camera.main.WorldToScreenPoint(Tank.position));
         Debug.Log("Ray Origin : " + x.origin + " direction : " + x.direction);
         float distanceFromCanon = Vector2.Distance(Input.mousePosition, Camera.main.WorldToScreenPoint(Tank.position)) * 0.03f;
         Debug.Log(distanceFromCanon.ToString());
         distanceFromCanon = Mathf.Clamp(distanceFromCanon, 0f, 4f);
 
         //corsair.position = x.GetPoint(distanceFromCanon);
     Vector2 temp = x.GetPoint(distanceFromCanon);
         temp.x = Mathf.Clamp(temp.x, TankX, TankX2);
         temp.y = Mathf.Clamp(temp.y, TankY, TankY2);
         corsair.position = temp;
     }
     }


and I am using static position for my tank thats why if it moves it will only take initial position as clamping reference; // not tested but you can move start() function contents to update to make it follow tank.position

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