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WPF图形解锁控件ScreenUnLock使用详解

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这篇CFSDN的博客文章WPF图形解锁控件ScreenUnLock使用详解由作者收集整理,如果你对这篇文章有兴趣,记得点赞哟.

ScreenUnLock 与智能手机上的图案解锁功能一样。通过绘制图形达到解锁或记忆图形的目的.

本人突发奇想,把手机上的图形解锁功能移植到WPF中。也应用到了公司的项目中.

在创建ScreenUnLock之前,先来分析一下图形解锁的实现思路.

1.创建九宫格原点(或更多格子),每个点定义一个坐标值 。

2.提供图形解锁相关扩展属性和事件,方便调用者定义。比如:点和线的颜色(Color),操作模式(Check|Remember),验证正确的颜色(RightColor), 验证失败的颜色(ErrorColor), 解锁事件 OnCheckedPoint,记忆事件 OnRememberPoint 等,

3.定义MouseMove事件监听画线行为。 画线部分也是本文的核心。在画线过程中。程序需判断,线条从哪个点开始绘制,经过了哪个点(排除已经记录的点)。是否完成了绘制等等.

4.画线完成,根据操作模式处理画线完成行为。并调用相关自定义事件 。

大致思路如上,下面开始一步一步编写ScreenUnLock吧 。

创建ScreenUnLock 。

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public partial class ScreenUnlock : UserControl

定义相关属性 。

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/// <summary>
   /// 验证正确的颜色
   /// </summary>
   private SolidColorBrush rightColor;
 
   /// <summary>
   /// 验证失败的颜色
   /// </summary>
   private SolidColorBrush errorColor;
 
   /// <summary>
   /// 图案是否在检查中
   /// </summary>
   private bool isChecking;
 
   public static readonly DependencyProperty PointArrayProperty = DependencyProperty.Register( "PointArray" , typeof (IList< string >), typeof (ScreenUnlock));
   /// <summary>
   /// 记忆的坐标点
   /// </summary>
   public IList< string > PointArray
   {
    get { return GetValue(PointArrayProperty) as IList< string >; }
    set { SetValue(PointArrayProperty, value); }
   }
 
   /// <summary>
   /// 当前坐标点集合
   /// </summary>
   private IList< string > currentPointArray;
 
   /// <summary>
   /// 当前线集合
   /// </summary>
   private IList<Line> currentLineList;
 
   /// <summary>
   /// 点集合
   /// </summary>
   private IList<Ellipse> ellipseList;
 
   /// <summary>
   /// 当前正在绘制的线
   /// </summary>
   private Line currentLine;
 
   public static readonly DependencyProperty OperationPorperty = DependencyProperty.Register( "Operation" , typeof (ScreenUnLockOperationType), typeof (ScreenUnlock), new FrameworkPropertyMetadata(ScreenUnLockOperationType.Remember));
   /// <summary>
   /// 操作类型
   /// </summary>
   public ScreenUnLockOperationType Operation
   {
    get { return (ScreenUnLockOperationType)GetValue(OperationPorperty); }
    set { SetValue(OperationPorperty, value); }
   }
 
   public static readonly DependencyProperty PointSizeProperty = DependencyProperty.Register( "PointSize" , typeof ( double ), typeof (ScreenUnlock), new FrameworkPropertyMetadata(15.0));
   /// <summary>
   /// 坐标点大小
   /// </summary>
   public double PointSize
   {
    get { return Convert.ToDouble(GetValue(PointSizeProperty)); }
    set { SetValue(PointSizeProperty, value); }
   }
 
 
   public static readonly DependencyProperty ColorProperty = DependencyProperty.Register( "Color" , typeof (SolidColorBrush), typeof (ScreenUnlock), new FrameworkPropertyMetadata( new SolidColorBrush(Colors.White), new PropertyChangedCallback((s, e) =>
   {
    (s as ScreenUnlock).Refresh();
   })));
 
   /// <summary>
   /// 坐标点及线条颜色
   /// </summary>
   public SolidColorBrush Color
   {
    get { return GetValue(ColorProperty) as SolidColorBrush; }
    set { SetValue(ColorProperty, value); }
   }
 
       /// <summary>
       /// 操作类型
       /// </summary>
       public enum ScreenUnLockOperationType
      {
       Remember = 0, Check = 1
      }

初始化ScreenUnLock 。

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public ScreenUnlock()
   {
    InitializeComponent();
    this .Loaded += ScreenUnlock_Loaded;
    this .Unloaded += ScreenUnlock_Unloaded;
    this .MouseMove += ScreenUnlock_MouseMove; //监听绘制事件
   }
  private void ScreenUnlock_Loaded( object sender, RoutedEventArgs e)
   {
    isChecking = false ;
    rightColor = new SolidColorBrush(Colors.Green);
    errorColor = new SolidColorBrush(Colors.Red);
    currentPointArray = new List< string >();
    currentLineList = new List<Line>();
    ellipseList = new List<Ellipse>();
    CreatePoint();
   }
 
 
   private void ScreenUnlock_Unloaded( object sender, RoutedEventArgs e)
   {
    rightColor = null ;
    errorColor = null ;
    if (currentPointArray != null )
     this .currentPointArray.Clear();
    if (currentLineList != null )
     this .currentLineList.Clear();
    if (ellipseList != null )
     ellipseList.Clear();
    this .canvasRoot.Children.Clear();
   }

创建点 。

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/// <summary>
   /// 创建点
   /// </summary>
   private void CreatePoint()
   {
    canvasRoot.Children.Clear();
    int row = 3, column = 3; //三行三列,九宫格
    double oneColumnWidth = ( this .ActualWidth == 0 ? this .Width : this .ActualWidth) / 3; //单列的宽度
    double oneRowHeight = ( this .ActualHeight == 0 ? this .Height : this .ActualHeight) / 3; //单列的高度
    double leftDistance = (oneColumnWidth - PointSize) / 2; //单列左边距
    double topDistance = (oneRowHeight - PointSize) / 2; //单列上边距
    for (var i = 0; i < row; i++)
    {
     for (var j = 0; j < column; j++)
     {
      Ellipse ellipse = new Ellipse()
      {
       Width = PointSize,
       Height = PointSize,
       Fill = Color,
       Tag = string .Format( "{0}{1}" , i, j)
      };
      Canvas.SetLeft(ellipse, j * oneColumnWidth + leftDistance);
      Canvas.SetTop(ellipse, i * oneRowHeight + topDistance);
      canvasRoot.Children.Add(ellipse);
      ellipseList.Add(ellipse);
     }
    }
   }

创建线 。

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private Line CreateLine()
   {
    Line line = new Line()
    {
     Stroke = Color,
     StrokeThickness = 2
    };
    return line;
   }

点和线都创建都定义好了,可以开始监听绘制事件了 。

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private void ScreenUnlock_MouseMove( object sender, System.Windows.Input.MouseEventArgs e)
   {
    if (isChecking) //如果图形正在检查中,不响应后续处理
     return ;
    if (e.LeftButton == System.Windows.Input.MouseButtonState.Pressed)
    {
     var point = e.GetPosition( this );
     HitTestResult result = VisualTreeHelper.HitTest( this , point);
     Ellipse ellipse = result.VisualHit as Ellipse;
     if (ellipse != null )
     {
      if (currentLine == null )
      {
       //从头开始绘制                 
       currentLine = CreateLine();
       var ellipseCenterPoint = GetCenterPoint(ellipse);
       currentLine.X1 = currentLine.X2 = ellipseCenterPoint.X;
       currentLine.Y1 = currentLine.Y2 = ellipseCenterPoint.Y;
 
       currentPointArray.Add(ellipse.Tag.ToString());
       Console.WriteLine( string .Join( "," , currentPointArray));
       currentLineList.Add(currentLine);
       canvasRoot.Children.Add(currentLine);
      }
      else
      {
       //遇到下一个点,排除已经经过的点
       if (currentPointArray.Contains(ellipse.Tag.ToString()))
        return ;
       OnAfterByPoint(ellipse);
      }
     }
     else if (currentLine != null )
     {
      //绘制过程中
      currentLine.X2 = point.X;
      currentLine.Y2 = point.Y;
 
      //判断当前Line是否经过点
      ellipse = IsOnLine();
      if (ellipse != null )
       OnAfterByPoint(ellipse);
     }
    }
    else
    {
     if (currentPointArray.Count == 0)
      return ;
     isChecking = true ;
     if (currentLineList.Count + 1 != currentPointArray.Count)
     {
      //最后一条线的终点不在点上
      //两点一线,点的个数-1等于线的条数
      currentLineList.Remove(currentLine); //从已记录的线集合中删除最后一条多余的线
      canvasRoot.Children.Remove(currentLine); //从界面上删除最后一条多余的线
      currentLine = null ;
     }
 
     if (Operation == ScreenUnLockOperationType.Check)
     {
      Console.WriteLine( "playAnimation Check" );
      var result = CheckPoint(); //执行图形检查
              //执行完成动画并触发检查事件
      PlayAnimation(result, () =>
      {
       if (OnCheckedPoint != null )
       {
        this .Dispatcher.BeginInvoke(OnCheckedPoint, this , new CheckPointArgs() { Result = result }); //触发检查完成事件
       }
      });
 
     }
     else if (Operation == ScreenUnLockOperationType.Remember)
     {
      Console.WriteLine( "playAnimation Remember" );
      RememberPoint(); //记忆绘制的坐标
      var args = new RememberPointArgs() { PointArray = this .PointArray };
              //执行完成动画并触发记忆事件
      PlayAnimation( true , () =>
      {
       if (OnRememberPoint != null )
       {
        this .Dispatcher.BeginInvoke(OnRememberPoint, this , args); //触发图形记忆事件
       }
      });
     }
    }
   }

判断线是否经过了附近的某个点 。

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/// <summary>
   /// 两点计算一线的长度
   /// </summary>
   /// <param name="pt1"></param>
   /// <param name="pt2"></param>
   /// <returns></returns>
   private double GetLineLength( double x1, double y1, double x2, double y2)
   {
    return Math.Sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)); //根据两点计算线段长度公式 √((x1-x2)²x(y1-y2)²)
   }
 
   /// <summary>
   /// 判断线是否经过了某个点
   /// </summary>
   /// <param name="ellipse"></param>
   /// <returns></returns>
   private Ellipse IsOnLine()
   {
    double lineAB = 0; //当前画线的长度
    double lineCA = 0; //当前点和A点的距离
    double lineCB = 0; //当前点和B点的距离
    double dis = 0;
    double deciation = 1; //允许的偏差距离
    lineAB = GetLineLength(currentLine.X1, currentLine.Y1, currentLine.X2, currentLine.Y2); //计算当前画线的长度
 
    foreach (Ellipse ellipse in ellipseList)
    {
     if (currentPointArray.Contains(ellipse.Tag.ToString())) //排除已经经过的点
      continue ;
     var ellipseCenterPoint = GetCenterPoint(ellipse); //取当前点的中心点
     lineCA = GetLineLength(currentLine.X1, currentLine.Y1, ellipseCenterPoint.X, ellipseCenterPoint.Y); //计算当前点到线A端的长度
     lineCB = GetLineLength(currentLine.X2, currentLine.Y2, ellipseCenterPoint.X, ellipseCenterPoint.Y); //计算当前点到线B端的长度
     dis = Math.Abs(lineAB - (lineCA + lineCB)); //线CA的长度+线CB的长度>当前线AB的长度 说明点不在线上
     if (dis <= deciation) //因为绘制的点具有一个宽度和高度,所以需设定一个允许的偏差范围,让线靠近点就命中之(吸附效果)
     {
      return ellipse;
     }
    }
    return null ;
   }

检查点是否正确,按数组顺序逐个匹配之 。

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/// <summary>
   /// 检查坐标点是否正确
   /// </summary>
   /// <returns></returns>
   private bool CheckPoint()
   {
          //PointArray:正确的坐标值数组
          //currentPointArray:当前绘制的坐标值数组
    if (currentPointArray.Count != PointArray.Count)
     return false ;
    for (var i = 0; i < currentPointArray.Count; i++)
    {
     if (currentPointArray[i] != PointArray[i])
      return false ;
    }
    return true ;
   }

记录经过点,并创建一条新的线 。

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/// <summary>
   /// 记录经过的点
   /// </summary>
   /// <param name="ellipse"></param>
   private void OnAfterByPoint(Ellipse ellipse)
   {
    var ellipseCenterPoint = GetCenterPoint(ellipse);
    currentLine.X2 = ellipseCenterPoint.X;
    currentLine.Y2 = ellipseCenterPoint.Y;
    currentLine = CreateLine();
    currentLine.X1 = currentLine.X2 = ellipseCenterPoint.X;
    currentLine.Y1 = currentLine.Y2 = ellipseCenterPoint.Y;
    currentPointArray.Add(ellipse.Tag.ToString());
    Console.WriteLine( string .Join( "," , currentPointArray));
    currentLineList.Add(currentLine);
    canvasRoot.Children.Add(currentLine);
   }
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/// <summary>
   /// 获取原点的中心点坐标
   /// </summary>
   /// <param name="ellipse"></param>
   /// <returns></returns>
   private Point GetCenterPoint(Ellipse ellipse)
   {
    Point p = new Point(Canvas.GetLeft(ellipse) + ellipse.Width / 2, Canvas.GetTop(ellipse) + ellipse.Height / 2);
    return p;
   }

当绘制完成时,执行完成动画并触发响应模式的事件 。

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/// <summary>
   /// 执行动画
   /// </summary>
   /// <param name="result"></param>
   private void PlayAnimation( bool result, Action callback = null )
   {
    Task.Factory.StartNew(() =>
    {
     this .Dispatcher.Invoke((Action) delegate
     {
      foreach (Line l in currentLineList)
       l.Stroke = result ? rightColor : errorColor;
      foreach (Ellipse e in ellipseList)
       if (currentPointArray.Contains(e.Tag.ToString()))
        e.Fill = result ? rightColor : errorColor;
     });
     Thread.Sleep(1500);
     this .Dispatcher.Invoke((Action) delegate
     {
      foreach (Line l in currentLineList)
       this .canvasRoot.Children.Remove(l);
      foreach (Ellipse e in ellipseList)
       e.Fill = Color;
     });
     currentLine = null ;
     this .currentPointArray.Clear();
     this .currentLineList.Clear();
     isChecking = false ;
    }).ContinueWith(t =>
    {
     try
     {
      if (callback != null )
       callback();
     }
     catch (Exception ex)
     {
      Console.WriteLine(ex.Message);
     }
     finally
     {
      t.Dispose();
     }
    });
   }

图形解锁的调用 。

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<local:ScreenUnlock Width= "500" Height= "500"
       PointArray= "{Binding PointArray, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
       Operation= "Check" > <!--或Remember-->
       <i:Interaction.Triggers>
        <i:EventTrigger EventName= "OnCheckedPoint" >
         <Custom:EventToCommand Command= "{Binding OnCheckedPoint}" PassEventArgsToCommand= "True" />
        </i:EventTrigger>
        <i:EventTrigger EventName= "OnRememberPoint" >
         <Custom:EventToCommand Command= "{Binding OnRememberPoint}" PassEventArgsToCommand= "True" />
        </i:EventTrigger>
       </i:Interaction.Triggers>
      </local:ScreenUnlock>

WPF图形解锁控件ScreenUnLock使用详解

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