282 lines
9.1 KiB
C#
282 lines
9.1 KiB
C#
/*
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* ModelController
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*
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* 旋转、平移和缩放对象
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*
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* 作者: Kirurobo http://twitter.com/kirurobo
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* 许可证: MIT
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*/
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using System;
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using UnityEngine;
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namespace Kirurobo
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{
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public class ModelController : MonoBehaviour
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{
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[Flags]
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public enum RotationAxes : int
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{
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None = 0,
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Pitch = 1,
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Yaw = 2,
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PitchAndYaw = 3
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}
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[Flags]
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public enum DragState
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{
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None,
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Rotating,
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Translating,
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}
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public RotationAxes axes = RotationAxes.PitchAndYaw;
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public float yawSensitivity = 1f;
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public float pitchSensitvity = 1f;
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public float scaleSensitivity = 0.5f;
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public Vector2 minimumAngles = new Vector2(-90f, -360f);
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public Vector2 maximumAngles = new Vector2(90f, 360f);
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[Tooltip("Restrict to move out from screen")]
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public bool confineTranslation = true; // 是否将位移限制在窗口（屏幕）范围内
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[Tooltip("Default is the parent transform")]
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public Transform centerTransform; // 回転中心
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[Tooltip("Default is the main camera")]
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public Camera currentCamera;
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internal GameObject centerObject = null; // 当未指定旋转中心Transform时创建的对象
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internal Vector3 rotation;
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internal Vector3 translation;
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internal Vector3 lastMousePosition; // 上一帧的鼠标坐标
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internal DragState dragState; // 拖动时根据开始时的按钮设置对应状态
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internal Vector3 relativePosition;
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internal Quaternion relativeRotation;
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internal Vector3 originalLocalScale;
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internal float zoom;
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void Start()
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{
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Initialize();
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SetupTransform();
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}
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void OnDestroy()
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{
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// 如果旋转中心是独立创建的，则删除
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if (centerObject) GameObject.Destroy(centerObject);
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}
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void Update()
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{
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if (!currentCamera.isActiveAndEnabled) return;
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{
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HandleMouse();
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}
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}
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/// <summary>
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/// 获取并准备所需对象
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/// </summary>
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internal void Initialize()
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{
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if (!centerTransform)
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{
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centerTransform = this.transform.parent;
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if (!centerTransform || centerTransform == this.transform)
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{
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centerObject = new GameObject();
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centerTransform = centerObject.transform;
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centerTransform.position = Vector3.zero;
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}
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}
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if (!currentCamera)
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{
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currentCamera = Camera.main;
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}
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lastMousePosition = InputProxy.mousePosition;
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}
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/// <summary>
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/// 设置初始位置和姿态
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/// 在目标对象就绪后执行
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/// </summary>
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internal void SetupTransform()
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{
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relativePosition = transform.position- centerTransform.position; // 从对象到中心坐标的向量
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relativeRotation = transform.rotation * Quaternion.Inverse(centerTransform.rotation);
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originalLocalScale = transform.localScale;
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ResetTransform();
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}
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/// <summary>
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/// Reset rotation and translation.
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/// </summary>
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public void ResetTransform()
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{
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rotation = relativeRotation.eulerAngles;
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translation = relativePosition;
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zoom = 0f;
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UpdateTransform();
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}
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/// <summary>
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/// 应用旋转和平移
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/// </summary>
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internal void UpdateTransform()
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{
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Quaternion rot = Quaternion.Euler(rotation);
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transform.rotation = rot;
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transform.position = centerTransform.position + translation;
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transform.localScale = originalLocalScale * Mathf.Pow(10f, zoom);
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}
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internal virtual void HandleMouse()
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{
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Vector3 mousePos = InputProxy.mousePosition;
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if (InputProxy.GetMouseButtonDown(0))
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{
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// 左键(0)拖动时进行平移
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if (dragState == DragState.None && IsHit(mousePos))
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{
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dragState = DragState.Translating;
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// 限制在屏幕范围内
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if (confineTranslation)
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{
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Vector3 screenMax = new Vector3(Screen.width, Screen.height);
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mousePos = Vector3.Max(Vector3.Min(mousePos, screenMax), Vector3.zero);
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}
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lastMousePosition = mousePos; // 拖动开始时重置
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}
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}
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else if (InputProxy.GetMouseButtonDown(1))
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{
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// 右键(1)拖动时进行旋转
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if (dragState == DragState.None && IsHit(mousePos))
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{
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dragState = DragState.Rotating;
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lastMousePosition = mousePos; // 拖动开始时重置
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}
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}
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// 通过拖动旋转
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if (dragState == DragState.Rotating)
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{
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// 仅在按下按钮时操作
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if (InputProxy.GetMouseButton(1))
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{
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// 通过拖动旋转
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if ((axes & RotationAxes.Yaw) > RotationAxes.None)
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{
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rotation.y -= (mousePos.x - lastMousePosition.x) * 360f / Screen.width * yawSensitivity;
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rotation.y = ClampAngle(rotation.y, minimumAngles.y, maximumAngles.y);
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}
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if ((axes & RotationAxes.Pitch) > RotationAxes.None)
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{
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rotation.x += (mousePos.y - lastMousePosition.y) * 360f / Screen.height * pitchSensitvity;
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rotation.x = ClampAngle(rotation.x, minimumAngles.x, maximumAngles.x);
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}
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UpdateTransform();
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}
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else
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{
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// 如果右键已松开则结束旋转
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dragState = DragState.None;
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}
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}
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// 通过拖动平移
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if (dragState == DragState.Translating)
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{
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// 仅在按下按钮时操作
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if (InputProxy.GetMouseButton(0))
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{
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// 限制在屏幕范围内
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if (confineTranslation)
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{
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Vector3 screenMax = new Vector3(Screen.width, Screen.height);
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mousePos = Vector3.Max(Vector3.Min(mousePos, screenMax), Vector3.zero);
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}
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Vector3 screenPos = currentCamera.WorldToScreenPoint(transform.position);
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Vector3 deltaPos = mousePos - lastMousePosition;
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deltaPos.z = 0f;
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Vector3 worldPos = currentCamera.ScreenToWorldPoint(screenPos + deltaPos);
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translation = worldPos - centerTransform.position;
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UpdateTransform();
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}
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else
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{
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// 如果按钮已松开则结束位移
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dragState = DragState.None;
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}
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}
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// 暂时仅在使用 Legacy Input Manager 时接受滚轮操作
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#if ENABLE_LEGACY_INPUT_MANAGER
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// 如果滚轮转动，则进行缩放
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if (!Mathf.Approximately(Input.GetAxis("Mouse ScrollWheel"), 0f) && IsHit(mousePos))
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{
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// 滚轮操作量
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float wheelDelta = Input.GetAxis("Mouse ScrollWheel") * scaleSensitivity;
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// 更改缩放倍率
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zoom -= wheelDelta;
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zoom = Mathf.Clamp(zoom, -1f, 2f); // 视场角的对数范围 [度]
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UpdateTransform();
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}
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#endif
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lastMousePosition = mousePos;
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}
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/// <summary>
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/// 判断鼠标操作时是否点击到对象
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/// </summary>
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/// <returns></returns>
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internal bool IsHit(Vector3 screenPosition)
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{
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RaycastHit hit;
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Ray ray = currentCamera.ScreenPointToRay(screenPosition);
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if (Physics.Raycast(ray, out hit))
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{
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if (hit.transform.IsChildOf(transform)) return true;
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}
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return false;
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}
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/// <summary>
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/// 若角度超出指定范围，则进行修正
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/// </summary>
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/// <param name="angle"></param>
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/// <param name="min"></param>
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/// <param name="max"></param>
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/// <returns></returns>
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public static float ClampAngle(float angle, float min, float max)
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{
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if (angle < -min) angle = -((-angle) % 360f);
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if (angle > max) angle = angle % 360f;
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return Mathf.Clamp(angle, min, max);
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}
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}
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} |