115 lines
3.8 KiB
C#
115 lines
3.8 KiB
C#
using UnityEngine;
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class ScrollAndPinch : MonoBehaviour
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{
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#if UNITY_IOS || UNITY_ANDROID
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public Camera Camera;
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public bool Rotate;
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protected Plane Plane;
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public float DecreaseCameraPanSpeed = 1; //Default speed is 1
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public float CameraUpperHeightBound; //Zoom out
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public float CameraLowerHeightBound; //Zoom in
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private Vector3 cameraStartPosition;
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private void Awake()
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{
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if (Camera == null)
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Camera = Camera.main;
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cameraStartPosition = Camera.transform.position;
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}
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private void Update()
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{
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//Update Plane
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// if (Input.touchCount >= 1)
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//Plane.SetNormalAndPosition(transform.up, transform.position);
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var Delta1 = Vector3.zero;
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var Delta2 = Vector3.zero;
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//Scroll (Pan function)
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if (Input.touchCount >= 1)
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{
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//Get distance camera should travel
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Delta1 = PlanePositionDelta(Input.GetTouch(0))/DecreaseCameraPanSpeed;
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if (Input.GetTouch(0).phase == TouchPhase.Moved)
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Camera.transform.Translate(Delta1, Space.World);
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}
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//Pinch (Zoom Function)
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if (Input.touchCount >= 2)
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{
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var pos1 = PlanePosition(Input.GetTouch(0).position);
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var pos2 = PlanePosition(Input.GetTouch(1).position);
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var pos1b = PlanePosition(Input.GetTouch(0).position - Input.GetTouch(0).deltaPosition);
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var pos2b = PlanePosition(Input.GetTouch(1).position - Input.GetTouch(1).deltaPosition);
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//calc zoom
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var zoom = Vector3.Distance(pos1, pos2) /
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Vector3.Distance(pos1b, pos2b);
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//edge case
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if (zoom == 0 || zoom > 10)
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return;
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//Move cam amount the mid ray
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Vector3 camPositionBeforeAdjustment = Camera.transform.position;
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Camera.transform.position = Vector3.LerpUnclamped(pos1, Camera.transform.position, 1 / zoom);
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//Restricts zoom height
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//Upper (ZoomOut)
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if (Camera.transform.position.y > (cameraStartPosition.y + CameraUpperHeightBound))
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{
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Camera.transform.position = camPositionBeforeAdjustment;
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}
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//Lower (Zoom in)
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if (Camera.transform.position.y < (cameraStartPosition.y - CameraLowerHeightBound) || Camera.transform.position.y <= 1)
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{
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Camera.transform.position = camPositionBeforeAdjustment;
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}
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//Rotation Function
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if (Rotate && pos2b != pos2)
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Camera.transform.RotateAround(pos1, Plane.normal, Vector3.SignedAngle(pos2 - pos1, pos2b - pos1b, Plane.normal));
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}
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}
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//Returns the point between first and final finger position
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protected Vector3 PlanePositionDelta(Touch touch)
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{
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//not moved
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if (touch.phase != TouchPhase.Moved)
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return Vector3.zero;
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//delta
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var rayBefore = Camera.ScreenPointToRay(touch.position - touch.deltaPosition);
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var rayNow = Camera.ScreenPointToRay(touch.position);
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if (Plane.Raycast(rayBefore, out var enterBefore) && Plane.Raycast(rayNow, out var enterNow))
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return rayBefore.GetPoint(enterBefore) - rayNow.GetPoint(enterNow);
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//not on plane
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return Vector3.zero;
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}
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protected Vector3 PlanePosition(Vector2 screenPos)
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{
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//position
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var rayNow = Camera.ScreenPointToRay(screenPos);
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if (Plane.Raycast(rayNow, out var enterNow))
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return rayNow.GetPoint(enterNow);
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return Vector3.zero;
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}
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private void OnDrawGizmos()
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{
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Gizmos.DrawLine(transform.position, transform.position + transform.up);
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}
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#endif
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} |