ScreenUnLock-图形解锁控件使用详解

这篇文章主要为大家详细介绍了WPF图形解锁控件ScreenUnLock的使用方法，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

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

public partial class ScreenUnlock : UserControl

定义相关属性

/// <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

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

/// <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

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

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

/// <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

/// <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

/// <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);  }

/// <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

/// <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

<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>

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