WPF 图表控件之曲线绘制与移动
目的：绘制简单轻量级的曲线视图
二、实现效果：
1，绘制标准基准线
2，可拖动
三、用到控件
1，Canvas
2，Ellipse
XAML代码：
<Canvas Background="#232323" Grid.Row="1" x:Name="MainCanvas" SizeChanged="LiveChar_SizeChanged"
Width="600" Height="300" MouseMove="MainCanvas_MouseMove"
ClipToBounds="True" MouseLeftButtonDown="MainCanvas_MouseLeftButtonDown"
MouseLeftButtonUp="MainCanvas_MouseLeftButtonUp"/>
CS代码：
1，定义变量
/// <summary> /// 画板宽度 /// </summary> public double BoardWidth { get; set; } /// <summary> /// 画板高度 /// </summary> public double BoardHeight { get; set; } /// <summary> /// 平行（横向）边距（画图区域距离左右两边长度） /// </summary> public double HorizontalMargin { get; set; } /// <summary> /// 垂直（纵向）边距（画图区域距离左右两边长度） /// </summary> public double VerticalMargin { get; set; } /// <summary> /// 水平刻度间距像素 /// </summary> public double horizontalBetween { get; set; } /// <summary> /// 垂直刻度间距像素 /// </summary> public double verticalBetween { get; set; } /// <summary> /// 图表区域宽度 /// </summary> public double ChartWidth; /// <summary> /// 图表区域高度 /// </summary> public double ChartHeight; /// <summary> /// <summary> /// 坐标点数据源 /// </summary> public PointCollection DataSourse; /// <summary> /// 画图区域起点 /// </summary> public Point StartPostion; /// <summary> /// 画图区域终点 /// </summary> public Point EndPostion; /// <summary> /// x轴最大值 /// </summary> public double MaxX { get; set; } /// <summary> /// y轴最大值 /// </summary> public double MaxY { get; set; } /// <summary> /// x轴最小值 /// </summary> public double MinX { get; set; } /// <summary> /// y轴最小值 /// </summary> public double MinY { get; set; } double MapLocationX = 0; double MapLocationY = 0; TextBox moushPonit; Point pBefore = new Point();//鼠标点击前坐标 Point eBefore = new Point();//圆移动前坐标 bool isMove = false;//是否需要移 Path path2 = null;
2，定义类型
public enum DrawType { //Line L, //Horizontal line H, //Vertical line V, //Cubic Bezier curve C, //Quadratic Bezier curve Q, //Smooth cubic Bezier curve S, //smooth quadratic Bezier curve T } public class SpeedOrPower { public double SpeedNum { get; set; } public double PowerNum { get; set; } }
3，方法
private PointCollection GetCollection() { PointCollection myPointCollection = new PointCollection() { new Point(0,50), new Point(10,50), new Point(20,50), new Point(100,100) }; return myPointCollection; } private void LiveChar_SizeChanged(object sender, SizeChangedEventArgs e) { Refresh(); } private void Refresh() { InitCanvas(); //获取y最大值 if (MaxY < 0.0001) { MaxY = 100; } //MinY = DataSourse.Min(m => m.Y); if (MaxX < 0.0001) { MaxX = 100; } //MinX = DataSourse.Min(m => m.X); if (Math.Abs(MaxX) < 0.000001 || Math.Abs(MaxY) < 0.000001) { return; } DrawAxis(); DrawXAxisScale(); DrawYAxisScale(); DrawPolyLine(); } List<Point> Points = new List<Point>(); /// <summary> /// 初始化计算点的相对坐标 /// </summary> private void DrawPolyLine() { foreach (var item in DataSourse) { Point point = GetRealPoint(item); Points.Add(point); } PaintLine(Points); PaintEllipse(Points); } /// <summary> /// 绘制控制点 /// </summary> /// <param name="points"></param> private void PaintEllipse(List<Point> points) { int i = 0; foreach (var item in points) { Ellipse ellipse = new Ellipse(); ellipse.Fill = Brushes.Yellow; ellipse.Width = 5; ellipse.Height = 5; ellipse.Tag = i; MainCanvas.Children.Add(ellipse); Canvas.SetTop(ellipse, item.Y-(ellipse.Width/2)); Canvas.SetLeft(ellipse, item.X - (ellipse.Height / 2)); i++; } } /// <summary> /// h绘制曲线 /// </summary> /// <param name="points"></param> private void PaintLine(List<Point> points, DrawType drawType = DrawType.C) { StringBuilder data = new StringBuilder("M"); switch (drawType) { case DrawType.L: data.AppendFormat("{0},{1} L", points[0].X, points[0].Y); break; case DrawType.H: data.AppendFormat("{0},{1} H", points[0].X, points[0].Y); break; case DrawType.V: data.AppendFormat("{0},{1} V", points[0].X, points[0].Y); break; case DrawType.C: data.AppendFormat("{0},{1} C", points[0].X, points[0].Y); break; case DrawType.Q: data.AppendFormat("{0},{1} Q", points[0].X, points[0].Y); break; case DrawType.S: data.AppendFormat("{0},{1} S", points[0].X, points[0].Y); break; case DrawType.T: data.AppendFormat("{0},{1} T", points[0].X, points[0].Y); break; default: break; } if (path2 != null) { for (int i = 1; i < points.Count; i++) { Point pre; Point next; if (i == 1) { var CurrentPoint = GetSpeedOrPower(points[i]); var GetCurrentPoint= GetSpeedOrPower(points[i - 1]); if (CurrentPoint.SpeedNum- GetCurrentPoint.SpeedNum < 10) { pre = new Point((points[i - 1].X + points[i].X) / 2, points[i ].Y); //控制点 next = new Point(points[i].X, points[i].Y); //控制点 } else { pre = new Point((points[i - 1].X + points[i].X) / 2, points[i-1].Y); //控制点 next = new Point((points[i - 1].X + points[i].X) / 2, points[i-1].Y); //控制点 } } else { pre = new Point((points[i - 1].X + points[i].X) / 2, points[i - 1].Y); //控制点 next = new Point((points[i - 1].X + points[i].X) / 2, points[i].Y); //控制点 } //Point pre = new Point((points[i - 1].X + points[i].X) / 2, points[i - 1].Y); //控制点 //Point next = new Point((points[i - 1].X + points[i].X) / 2, points[i - 1].Y); //控制点 data.AppendFormat(" {0},{1} {2},{3} {4},{5}", pre.X, pre.Y, next.X, next.Y, points[i].X, points[i].Y); } path2.Data = Geometry.Parse(data.ToString()); } else { // data.AppendFormat("{0},{1} C", points[0].X, points[0].Y); for (int i = 1; i < points.Count; i++) { Point pre = new Point((points[i - 1].X + points[i].X) / 2, points[i - 1].Y); //控制点 Point next = new Point((points[i - 1].X + points[i].X) / 2, points[i].Y); //控制点 data.AppendFormat(" {0},{1} {2},{3} {4},{5}", pre.X, pre.Y, next.X, next.Y, points[i].X, points[i].Y); } path2 = new Path { Stroke = Brushes.White, StrokeThickness = 2, Data = Geometry.Parse(data.ToString()) }; this.MainCanvas.Children.Add(path2); } } /// <summary> /// 查询相对坐标 /// </summary> /// <param name="point"></param> /// <returns></returns> private Point GetRealPoint(Point point) { var realX = StartPostion.X + (point.X - MinX) * ChartWidth / (MaxX - MinX) + MapLocationX; var realY = StartPostion.Y + (MaxY - point.Y) * ChartHeight / (MaxY - MinY) + MapLocationY; return new Point(realX, realY); } /// <summary> /// 绘制Y刻度 /// </summary> private void DrawYAxisScale() { if (MinY > MaxY) return; if (verticalBetween < 0.0001) verticalBetween = (MaxY - MinY) / 10; for (var i = MinY; i <= MaxY + 0.01; i += verticalBetween) { var y = EndPostion.Y - i * ChartHeight / (MaxY - MinY) + MapLocationY; var marker = new Line { X1 = StartPostion.X - 5, Y1 = y, X2 = StartPostion.X, Y2 = y, Stroke = Brushes.Red }; MainCanvas.Children.Add(marker); //绘制Y轴网格 var gridLine = new Line { X1 = StartPostion.X, Y1 = y, X2 = EndPostion.X, Y2 = y, StrokeThickness = 0.5, Stroke = new SolidColorBrush(Colors.AliceBlue) }; MainCanvas.Children.Add(gridLine); string text = i.ToString(CultureInfo.InvariantCulture); var MarkerText = new TextBlock { Text = text, Width = 30, Foreground = Brushes.Yellow, FontSize = 10, HorizontalAlignment = HorizontalAlignment.Right, TextAlignment = TextAlignment.Right }; MainCanvas.Children.Add(MarkerText); Canvas.SetTop(MarkerText, y - 10); Canvas.SetLeft(MarkerText, 00); } } /// <summary> /// 绘制X刻度 /// </summary> private void DrawXAxisScale() { if (MinX >= MaxX) return; if (horizontalBetween < 0.0001) horizontalBetween = (MaxX - MinX) / 10; for (var i = MinX; i <= MaxX + 0.01; i += horizontalBetween) { var x = StartPostion.X + i * ChartWidth / (MaxX - MinX) + MapLocationX; ///绘制X轴刻度 var marker = new Line { X1 = x, Y1 = EndPostion.Y, X2 = x, Y2 = EndPostion.Y + 4, Stroke = Brushes.Red }; MainCanvas.Children.Add(marker); //绘制X轴网格 var gridLine = new Line { X1 = x, Y1 = StartPostion.Y, X2 = x, Y2 = EndPostion.Y, StrokeThickness = 0.5, Stroke = new SolidColorBrush(Colors.AliceBlue) }; MainCanvas.Children.Add(gridLine); //绘制X轴字符 var text = i.ToString(CultureInfo.InvariantCulture); var markText = new TextBlock { Text = text, Width = 130, Foreground = Brushes.Yellow, VerticalAlignment = VerticalAlignment.Top, HorizontalAlignment = HorizontalAlignment.Stretch, TextAlignment = TextAlignment.Left, FontSize = 10 }; MainCanvas.Children.Add(markText); Canvas.SetTop(markText, EndPostion.Y + 5); Canvas.SetLeft(markText, x - 5); } } /// <summary> /// 绘制线条 /// </summary> private void DrawAxis() { var xaxis = new Line { X1 = StartPostion.X, Y1 = EndPostion.Y, X2 = EndPostion.X, Y2 = EndPostion.Y, Stroke = new SolidColorBrush(Colors.Black) }; MainCanvas.Children.Add(xaxis); var XaxisTop = new Line { X1 = StartPostion.Y, Y1 = StartPostion.Y, X2 = EndPostion.X, Y2 = StartPostion.Y, Stroke = new SolidColorBrush(Colors.Black) }; MainCanvas.Children.Add(XaxisTop); var yaxis = new Line { X1 = StartPostion.X, Y1 = StartPostion.Y, X2 = StartPostion.X, Y2 = EndPostion.Y, Stroke = new SolidColorBrush(Colors.Black) }; MainCanvas.Children.Add(yaxis); var YaxisBottom = new Line { X1 = EndPostion.X, Y1 = EndPostion.Y, X2 = EndPostion.X, Y2 = StartPostion.Y, Stroke = new SolidColorBrush(Colors.Black) }; MainCanvas.Children.Add(YaxisBottom); } /// <summary> /// 初始化 /// </summary> private void InitCanvas() { MainCanvas.Children.Clear(); BoardWidth = MainCanvas.ActualWidth - SystemParameters.VerticalScrollBarWidth; BoardHeight = MainCanvas.ActualHeight - SystemParameters.HorizontalScrollBarHeight; HorizontalMargin = 40; VerticalMargin = 40; ChartWidth = BoardWidth - 2 * HorizontalMargin;//画图区域宽度 ChartHeight = BoardHeight - 2 * VerticalMargin; //画图区域高度 StartPostion = new Point(HorizontalMargin, VerticalMargin); EndPostion = new Point(BoardWidth - HorizontalMargin, BoardHeight - VerticalMargin); moushPonit = new TextBox { Background = new SolidColorBrush(Colors.Transparent), Height = 20, Width = 200, Foreground = Brushes.White, BorderThickness = new Thickness(0), VerticalAlignment = VerticalAlignment.Top }; MainCanvas.Children.Add(moushPonit); Canvas.SetTop(moushPonit, 0); Canvas.SetLeft(moushPonit, 0); } /// <summary> /// 查询当前速度与功率的值 /// </summary> /// <param name="Point"></param> /// <returns></returns> public SpeedOrPower GetSpeedOrPower(Point Point) { double num2 = 100 - (Point.Y - VerticalMargin) / (EndPostion.Y - VerticalMargin) * 100; double num3 = (Point.X - HorizontalMargin) / (EndPostion.X - HorizontalMargin) * 100; double SpeedNum = Math.Round(num3, 1); double PowerNum = Math.Round(num2, 1); return new SpeedOrPower() { SpeedNum=SpeedNum,PowerNum=PowerNum}; } /// <summary> /// 鼠标移动时 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void MainCanvas_MouseMove(object sender, MouseEventArgs e) { Point currentMousePosition = e.GetPosition((UIElement)sender); var CurrentPoint = GetSpeedOrPower(currentMousePosition); if (e.OriginalSource != null && e.OriginalSource.GetType() == typeof(Ellipse) && isMove) { Ellipse el = (Ellipse)e.OriginalSource; Point p = e.GetPosition(null);//获取鼠标移动中的坐标 int index = Convert.ToInt32(el.Tag); if (CurrentPoint.SpeedNum < 0 || CurrentPoint.PowerNum < 0) isMove = false; if (currentMousePosition.X > EndPostion.X || currentMousePosition.X < StartPostion.X) isMove = false; if (eBefore.Y + (p.Y - pBefore.Y) > EndPostion.Y || eBefore.Y + (p.Y - pBefore.Y) < StartPostion.Y) isMove = false; if (index == 0) { var Getobj = GetSpeedOrPower(Points[index + 1]); if(CurrentPoint.PowerNum>Getobj.PowerNum) { isMove = false; return; } Canvas.SetLeft(el, Points[index].X - (el.Width / 2)); Canvas.SetTop(el, eBefore.Y + (p.Y - pBefore.Y)); Points[index] = new Point(Points[index].X, currentMousePosition.Y); PaintLine(Points); } else if (index == Points.Count() - 1) { var Getobj = GetSpeedOrPower(Points[index -1]); if (CurrentPoint.PowerNum < Getobj.PowerNum) { isMove = false; return; } Canvas.SetLeft(el, Points[index].X - (el.Width / 2)); Canvas.SetTop(el, eBefore.Y + (p.Y - pBefore.Y)); Points[index] = new Point(Points[index].X, currentMousePosition.Y); PaintLine(Points); } else { if (currentMousePosition.X > Points[index + 1].X) { isMove = false; return; } if (currentMousePosition.Y < Points[index + 1].Y) { isMove = false; return; } if (currentMousePosition.X < Points[index - 1].X) { isMove = false; return; } if (currentMousePosition.Y > Points[index - 1].Y) { isMove = false; return; } Canvas.SetLeft(el, currentMousePosition.X-(el.Width/2)); Canvas.SetTop(el, currentMousePosition.Y - (el.Height / 2)); Points[index] = currentMousePosition; PaintLine(Points); } } if (CurrentPoint.SpeedNum < 0) { moushPonit.Visibility = Visibility.Collapsed; CurrentPoint.SpeedNum = 0; return; } if (CurrentPoint.SpeedNum > 100) { moushPonit.Visibility = Visibility.Collapsed; return; } if (CurrentPoint.PowerNum < 0) { moushPonit.Visibility = Visibility.Collapsed; CurrentPoint.PowerNum = 0; return; } if (CurrentPoint.PowerNum > 100) { moushPonit.Visibility = Visibility.Collapsed; return; } moushPonit.Visibility = Visibility.Visible; moushPonit.Text = $"(Speed={CurrentPoint.SpeedNum}%:Power={CurrentPoint.PowerNum}%)"; Canvas.SetTop(moushPonit, currentMousePosition.Y - 20); Canvas.SetLeft(moushPonit, currentMousePosition.X); } /// <summary> /// 鼠标按下时 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void MainCanvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { if (e.OriginalSource.GetType() == typeof(Ellipse)) { this.pBefore = e.GetPosition(null);//获取点击前鼠标坐标 Ellipse el = (Ellipse)e.OriginalSource; el.Width = el.Width + 5; el.Height = el.Height + 5; this.eBefore = new Point(Canvas.GetLeft(el), Canvas.GetTop(el));//获取点击前圆的坐标 isMove = true;//开始移动了 el.CaptureMouse();//鼠标捕获此圆 } } /// <summary> /// 鼠标释放时 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void MainCanvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { if (e.OriginalSource.GetType() == typeof(Ellipse)) { Ellipse el = (Ellipse)e.OriginalSource; int index = Convert.ToInt32(el.Tag); if (el.Width >= 10) { el.Width = el.Width - 5; el.Height = el.Height - 5; } Canvas.SetLeft(el, Points[index].X - (el.Width / 2)); Canvas.SetTop(el, Points[index].Y - (el.Height / 2)); isMove = false;//结束移动了 el.ReleaseMouseCapture();//鼠标释放此圆 } }
实现效果：
github：
https://github.com/zt199510/ChartingTest
