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></param> /// <param></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></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