UGUI:窗口限制以及窗口缩放

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public class Scene : MonoBehaviour, IDragHandler, IPointerDownHandler {     public RectTransform RtTransform;     public RectTransform RTParent;     Vector2 downpos;     Vector2 newpos;     public void OnPointerDown(PointerEventData eventData)     {        RectTransformUtility.ScreenPointToLocalPointInRectangle        (RtTransform, eventData.position        ,eventData.pressEventCamera, out downpos);         //print(downpos);     }          public void OnDrag(PointerEventData eventData)     {         if (RectTransformUtility.ScreenPointToLocalPointInRectangle          (RtTransform, eventData.position          , eventData.pressEventCamera, out newpos))         {                         Vector2 offset = newpos - downpos;             transform.parent.position = (Vector2)transform.parent.position + offset;             downpos = newpos;         }          if (RTParent.position.x < 0)         {             Vector2 tmp = RTParent.position;             tmp.x = 0;             RTParent.position = tmp;         }         else if (RTParent.position.x > RtTransform.rect.width - RTParent.rect.width)         {             Vector2 tmp = RTParent.position;             tmp.x = RtTransform.rect.width - RTParent.rect.width;             RTParent.position = tmp;         }          if (RTParent.position.y < 0)         {             Vector2 tmp = RTParent.position;             tmp.y = 0;             RTParent.position = tmp;         }         else if (RTParent.position.y > RtTransform.rect.height - RTParent.rect.height)         {             Vector2 tmp = RTParent.position;             tmp.y = RtTransform.rect.height - RTParent.rect.height;             RTParent.position = tmp;         }      }

public class Zoom : MonoBehaviour,IPointerDownHandler,IDragHandler    {     public RectTransform canvasWindow;     public RectTransform parentWinfow;     Vector2 downpos;     Vector2 newpos;     Vector2 origsize;      public void OnPointerDown(PointerEventData eventData)     {         origsize = parentWinfow.sizeDelta;         RectTransformUtility.ScreenPointToLocalPointInRectangle         (canvasWindow, eventData.position, eventData.pressEventCamera, out downpos);     }      public void OnDrag(PointerEventData eventData)     {          if (RectTransformUtility.ScreenPointToLocalPointInRectangle            (canvasWindow, eventData.position, eventData.pressEventCamera, out newpos))         {             Vector2 offpos=newpos-downpos;            // offpos.y *= -1;             parentWinfow.sizeDelta =origsize + offpos;                 }     } }

来源：博客园

作者：优梦创客

链接：https://www.cnblogs.com/raymondking123/p/11554875.html