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需求
unity实现键盘wasd键控制图片的移动，图片长度未超出屏幕不能移动，宽度未超出屏幕不能移动。jk键控制图片的缩放，缩放有限制

using UnityEngine;public class ImageController : MonoBehaviour
{[Header("移动设置")]public float moveSpeed = 5f; // 移动速度private RectTransform rectTransform;private Vector2 originalSize; // 原始尺寸private Vector2 minPosition; // 最小位置限制private Vector2 maxPosition; // 最大位置限制[Header("缩放设置")]public float scaleSpeed = 0.1f; // 缩放速度public float minScale = 0.5f; // 最小缩放比例public float maxScale = 2f; // 最大缩放比例private Vector3 currentScale; // 当前缩放值private void Start(){rectTransform = GetComponent<RectTransform>();originalSize = rectTransform.sizeDelta;currentScale = rectTransform.localScale;// 计算初始位置限制CalculatePositionLimits();}private void Update(){HandleMovement();HandleScaling();}private void HandleMovement(){Vector2 moveInput = Vector2.zero;// 获取WASD输入if (Input.GetKey(KeyCode.W)) moveInput.y = 1f;if (Input.GetKey(KeyCode.S)) moveInput.y = -1f;if (Input.GetKey(KeyCode.A)) moveInput.x = -1f;if (Input.GetKey(KeyCode.D)) moveInput.x = 1f;// 归一化并应用速度if (moveInput.magnitude > 0){moveInput.Normalize();Vector2 newPosition = rectTransform.anchoredPosition + moveInput * moveSpeed * Time.deltaTime;// 应用位置限制newPosition.x = Mathf.Clamp(newPosition.x, minPosition.x, maxPosition.x);newPosition.y = Mathf.Clamp(newPosition.y, minPosition.y, maxPosition.y);rectTransform.anchoredPosition = newPosition;}}private void HandleScaling(){float scaleInput = 0f;// 获取JK输入if (Input.GetKey(KeyCode.J)) scaleInput = -1f;if (Input.GetKey(KeyCode.K)) scaleInput = 1f;if (scaleInput != 0f){// 计算新缩放值float newScale = currentScale.x + scaleInput * scaleSpeed * Time.deltaTime;newScale = Mathf.Clamp(newScale, minScale, maxScale);currentScale = new Vector3(newScale, newScale, 1f);rectTransform.localScale = currentScale;// 缩放后重新计算位置限制CalculatePositionLimits();// 确保缩放后图片不会超出边界Vector2 clampedPosition = rectTransform.anchoredPosition;clampedPosition.x = Mathf.Clamp(clampedPosition.x, minPosition.x, maxPosition.x);clampedPosition.y = Mathf.Clamp(clampedPosition.y, minPosition.y, maxPosition.y);rectTransform.anchoredPosition = clampedPosition;}}private void CalculatePositionLimits(){// 获取Canvas的尺寸RectTransform canvasRect = GetComponentInParent<Canvas>().GetComponent<RectTransform>();Vector2 canvasSize = canvasRect.sizeDelta;// 计算当前图片的实际尺寸（考虑缩放）Vector2 scaledSize = new Vector2(originalSize.x * currentScale.x,originalSize.y * currentScale.y);// 计算位置限制// 当图片尺寸小于等于屏幕尺寸时，不能移动if (scaledSize.x <= canvasSize.x){minPosition.x = 0;maxPosition.x = 0;}else{float halfImageWidth = scaledSize.x / 2f;float halfCanvasWidth = canvasSize.x / 2f;minPosition.x = halfCanvasWidth - halfImageWidth;maxPosition.x = halfImageWidth - halfCanvasWidth;}if (scaledSize.y <= canvasSize.y){minPosition.y = 0;maxPosition.y = 0;}else{float halfImageHeight = scaledSize.y / 2f;float halfCanvasHeight = canvasSize.y / 2f;minPosition.y = halfCanvasHeight - halfImageHeight;maxPosition.y = halfImageHeight - halfCanvasHeight;}}
}