Hololens入门之拍照编辑
Hololens入门之拍照编辑
在Hololens的使用过程中，可能会遇到以下场景，使用Hololens进行拍摄照片，然后对照片进行图像识别，但是由于初始拍摄的照片中干扰项太多，影响识别效果，这时就需要截取图片中的有效部分来对图片进行识别。
本项目使用Hololens进行拍照，然后对照片进行裁剪编辑，获取图片的有效区域。
完整代码可在GitHub上进行下载（https://github.com/adjacentech/HoloPhotoEditor）
裁剪过程中通过移动裁剪框的位置，以及改变裁剪框的大小来确定有效裁剪区域（关键代码如下）
using HoloToolkit.Unity.InputModule;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
public class CropBoxManager : MonoBehaviour, INavigationHandler
{
private Vector3 manipulationPreviousPosition;
public GameObject imageObject = null;
private float parentWidth = 0;
private float parentHeight = 0;
private Vector3 originalLocalPosition;
private Vector2 originalSizeDelta;
public float minWidth = 100;
public float minHeight = 100;
void Awake()
{
parentWidth = imageObject.GetComponent().rect.width;
parentHeight = imageObject.GetComponent().rect.height;
originalLocalPosition = gameObject.GetComponent().localPosition;
originalSizeDelta = gameObject.GetComponent().sizeDelta;
}
private void Start()
{
}
// Update is called once per frame
void Update()
{
}
///
/// 获取裁剪框的矩形区域
///
/// ();
}
///
/// 获取父对象的大小
///
///
/// 重置裁剪框的大小和位置
///
public void ResetCropBoxTransform()
{
gameObject.GetComponent().localPosition = new Vector3(originalLocalPosition.x, originalLocalPosition.y, originalLocalPosition.z) ;
gameObject.GetComponent().sizeDelta = new Vector2(originalSizeDelta.x, originalSizeDelta.y);
}
///
/// Navigation手势取消事件
///
///
public void OnNavigationCanceled(NavigationEventData eventData)
{
InputManager.Instance.ClearModalInputStack();
}
///
/// Navigation手势完成事件
///
///
public void OnNavigationCompleted(NavigationEventData eventData)
{
InputManager.Instance.ClearModalInputStack();
}
///
/// Navigation手势开始事件
///
///
public void OnNavigationStarted(NavigationEventData eventData)
{
if (ToolManager.Instance.selectedTool == null
|| ((ToolManager.Instance.selectedTool.type != ToolType.Resize)
&& (ToolManager.Instance.selectedTool.type != ToolType.Move))
/*|| (CapturePhotoManager.Instance.GetCurrentStatus() != CurrentStatus.EdittingPhoto)*/)
{
return;
}
InputManager.Instance.PushModalInputHandler(gameObject);
}
///
/// Navigation手势更新事件
///
///
public void OnNavigationUpdated(NavigationEventData eventData)
{
if (ToolManager.Instance.selectedTool == null
|| ((ToolManager.Instance.selectedTool.type != ToolType.Resize)
&& (ToolManager.Instance.selectedTool.type != ToolType.Move))
/*|| (CapturePhotoManager.Instance.GetCurrentStatus() != CurrentStatus.EdittingPhoto)*/)
{
return;
}
switch (ToolManager.Instance.selectedTool.type)
{
case ToolType.Move:
Move(eventData);
break;
case ToolType.Resize:
Resize(eventData);
break;
default:
break;
}
}
///
/// 平移裁剪框
///
///
private void Move(NavigationEventData eventData)
{
Vector3 moveVector = Vector3.one;
float deltaX = 8 * eventData.CumulativeDelta.x;
float deltaY = 8 * eventData.CumulativeDelta.y;
if (Math.Abs(eventData.CumulativeDelta.x) >= Math.Abs(eventData.CumulativeDelta.y))
{
//当水平移动分量大于垂直分量时，水平平移
moveVector = new Vector3(deltaX, 0, 0);
}
else
{
//当垂直移动分量大于水平分量时，垂直平移
moveVector = new Vector3(0, deltaY, 0);
}
//计算边界，重新调整位移
moveVector = RecalculateMoveVector(moveVector);
RectTransform rectTransform = gameObject.GetComponent();
gameObject.GetComponent().localPosition = new Vector3(
rectTransform.localPosition.x + moveVector.x,
rectTransform.localPosition.y + moveVector.y,
rectTransform.localPosition.z + moveVector.z);
}
///
/// 调整裁剪框的大小
///
///
private void Resize(NavigationEventData eventData)
{
if (Math.Abs(eventData.CumulativeDelta.x) >= Math.Abs(eventData.CumulativeDelta.y))
{
//当水平移动分量大于垂直分量时，修改宽度
float deltaX = 10 * eventData.CumulativeDelta.x;
Rect rect = gameObject.GetComponent().rect;
Rect newRect = new Rect((rect.width + deltaX) / 2, rect.height / 2, rect.width + deltaX, rect.height);
newRect = RecalculateRectWidth(newRect);
gameObject.GetComponent().sizeDelta = new Vector2(newRect.width, newRect.height);
}
else
{
//当垂直移动分量大于水平分量时，修改高度
float deltaY = 10 * eventData.CumulativeDelta.y;
Rect rect = gameObject.GetComponent().rect;
Rect newRect = new Rect(rect.width / 2, (rect.height + deltaY) / 2, rect.width, rect.height + deltaY);
newRect = RecalculateRectHeight(newRect);
gameObject.GetComponent().sizeDelta = new Vector2(newRect.width, newRect.height);
}
}
///
/// 重新计算位移
///
///
/// ();
Rect rect = rectTransform.rect;
//裁剪框移动不超出大图范围，需要满足以下条件
//-parentWidth / 2 + width / 2 <= x <= parentWidth / 2 - width / 2
//-parentHeight / 2 + height / 2 <= y <= parentHeight / 2 - height / 2
if (((rectTransform.localPosition.x + moveVector.x) >= (-parentWidth / 2 + rect.width / 2))
&& ((rectTransform.localPosition.x + moveVector.x) <= (parentWidth / 2 - rect.width / 2))
&& ((rectTransform.localPosition.y + moveVector.y) >= (-parentHeight / 2 + rect.height / 2))
&& ((rectTransform.localPosition.y + moveVector.y) <= (parentHeight / 2 - rect.height / 2)))
{
return moveVector;
}
float newX = moveVector.x;
float newY = moveVector.y;
//当超出左边框，重新计算水平移动分量
if ((rectTransform.localPosition.x + moveVector.x) < (-parentWidth / 2 + rect.width / 2))
{
newX = -parentWidth / 2 + rect.width / 2 - rectTransform.localPosition.x;
}
//当超出右边框，重新计算水平移动分量
if ((rectTransform.localPosition.x + moveVector.x) > (parentWidth / 2 - rect.width / 2))
{
newX = parentWidth / 2 - rect.width / 2 - rectTransform.localPosition.x;
}
//当超出下边框，重新计算垂直移动分量
if ((rectTransform.localPosition.y + moveVector.y) < (-parentHeight / 2 + rect.height / 2))
{
newY = -parentHeight / 2 + rect.height / 2 - rectTransform.localPosition.y;
}
//当超出上边框，重新计算垂直移动分量
if ((rectTransform.localPosition.y + moveVector.y) > (parentHeight / 2 - rect.height / 2))
{
newY = parentHeight / 2 - rect.height / 2 - rectTransform.localPosition.y;
}
return new Vector3(newX, newY, moveVector.z);
}
///
/// 重新计算裁剪框的宽度
///
/// 矩形区域
/// 返回矩形区域
private Rect RecalculateRectWidth(Rect rect)
{
//当裁剪框高度小于最小宽度时，重新调整为最小宽度
if (rect.width < minWidth)
{
return new Rect(minWidth / 2, rect.y, minWidth, rect.height);
}
RectTransform rectTransform = gameObject.GetComponent();
//在大图范围内进行移动，需满足条件 -parentWidth / 2 + width / 2 <= x <= parentWidth / 2 - width / 2
if ((rectTransform.localPosition.x >= (-parentWidth / 2 + rect.width / 2))
&& rectTransform.localPosition.x <= (parentWidth / 2 - rect.width / 2))
{
return rect;
}
//当裁剪框超出左边框时，重新进行调整
if (rectTransform.localPosition.x < (-parentWidth / 2 + rect.width / 2))
{
return new Rect(rectTransform.localPosition.x + parentWidth / 2, rect.y, 2 * rectTransform.localPosition.x + parentWidth, rect.height);
}
//当裁剪框超出右边框时，重新进行调整
if (rectTransform.localPosition.x > (parentWidth / 2 - rect.width / 2))
{
return new Rect(parentWidth/2 - rectTransform.localPosition.x, rect.y, parentWidth- 2 * rectTransform.localPosition.x, rect.height);
}
return rect;
}
///
/// 重新计算裁剪框的高度
///
/// 矩形区域
/// 返回矩形区域
private Rect RecalculateRectHeight(Rect rect)
{
//当裁剪框高度小于最小高度时，重新调整为最小高度
if (rect.height < minHeight)
{
return new Rect(rect.x, minHeight / 2, rect.width, minHeight);
}
RectTransform rectTransform = gameObject.GetComponent();
//在大图范围内进行移动，需满足条件 -parentHeight / 2 + height / 2 <= y <= parentHeight / 2 - height / 2
if ((rectTransform.localPosition.y >= (-parentHeight / 2 + rect.height / 2))
&& rectTransform.localPosition.y <= (parentHeight / 2 - rect.height / 2))
{
return rect;
}
//当裁剪框超出下边框时，重新进行调整
if (rectTransform.localPosition.y < (-parentHeight / 2 + rect.height / 2))
{
return new Rect(rect.x, rectTransform.localPosition.y + parentHeight / 2, rect.width, 2 * rectTransform.localPosition.y + parentHeight);
}
//当裁剪框超出上边框时，重新进行调整
if (rectTransform.localPosition.y > (parentHeight / 2 - rect.height / 2))
{
return new Rect(rect.x, parentHeight / 2 - rectTransform.localPosition.y, rect.width, parentHeight - 2 * rectTransform.localPosition.y);
}
return rect;
}
}
运行测试
1、点击进行拍照，获取照片
2、选择“移动”选项，上下左右拖拽裁剪框，调整裁剪框的位置
3、选择“调整大小”选项，上下左右拖拽裁剪框，调整裁剪框的大小
4、当调整到合适的位置和大小时，点击确定按钮，最终裁剪出所需要的有效区域
