效果图
界面绘制操作
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private Point? _startPoint = null; private void ContainerCanvas_OnPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e) { var position = e.GetPosition(ContainerCanvas); if (_startPoint == null) { _startPoint = position; } else { //删除预览 if (_previewLineElement != null) { ContainerCanvas.Children.Remove(_previewLineElement); _previewLineElement = null; _lastMovedPoint = null; } //确定结束点，绘制波浪线 var myLineElement = new MyLineElement(); myLineElement.DrawLine((Point)_startPoint, position); ContainerCanvas.Children.Add(myLineElement); _startPoint = null; } } private MyLineElement _previewLineElement = null; private Point? _lastMovedPoint = null; /// <summary> /// 波浪线绘制预览 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void ContainerCanvas_OnMouseMove(object sender, MouseEventArgs e) { var position = e.GetPosition(ContainerCanvas); if (_startPoint != null && (_lastMovedPoint == null || _lastMovedPoint != null & (position - (Point)_lastMovedPoint).Length >= 2)) { _lastMovedPoint = position; if (_previewLineElement != null) { ContainerCanvas.Children.Remove(_previewLineElement); } var myLineElement = new MyLineElement(); myLineElement.DrawLine((Point)_startPoint, position); ContainerCanvas.Children.Add(myLineElement); _previewLineElement = myLineElement; } } |
波浪线控件及绘制
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class MyLineElement : FrameworkElement { public MyLineElement() { _visualShape = new VisualCollection(this); } internal void DrawLine(Point startPoint, Point endPoint) { List<Point> points = ForgePoints(startPoint, endPoint); DrawLine(points); } private const int SeparatorPiexl = 4; private const int AbundancePiexl = 3; private List<Point> ForgePoints(Point startPoint, Point endPoint) { var points = new List<Point>(); var lineVector = endPoint - startPoint; var lineDistance = lineVector.Length; var lineAngle = Math.Atan2(-(endPoint.Y - startPoint.Y), endPoint.X - startPoint.X); points.Add(startPoint); int index = 0; bool isAbundanceUpward = true; while (index * SeparatorPiexl < lineDistance) { index++; //计算出间隔长度（模拟点到起始点） var separatorDistance = index * SeparatorPiexl; var abundancePiexl = AbundancePiexl; var distanceToStartPoint = Math.Sqrt(Math.Pow(separatorDistance, 2) + Math.Pow(abundancePiexl, 2)); //计算出模拟点、起始点，与直线的角度 var separatorAngle = Math.Atan2(AbundancePiexl, separatorDistance); separatorAngle = isAbundanceUpward ? separatorAngle : -separatorAngle; isAbundanceUpward = !isAbundanceUpward; //得到模拟点的水平角度 var mockPointAngle = lineAngle + separatorAngle; //计算出模拟点坐标 var verticalDistance = distanceToStartPoint * Math.Sin(mockPointAngle); var horizontalDistance = distanceToStartPoint * Math.Cos(mockPointAngle); var mockPoint = new Point(startPoint.X + horizontalDistance, startPoint.Y - verticalDistance); points.Add(mockPoint); } points.Add(endPoint); return points; } private void DrawLine(List<Point> points) { _visualShape.Clear(); var geometryTest = new StreamGeometry(); using (var ctx = geometryTest.Open()) { ctx.BeginFigure(points[0], true, false); if (points.Count % 2 == 0) { //绘制二阶贝塞尔函数，需要保证为偶数点 ctx.PolyQuadraticBezierTo(points, true, true); } else { //绘制二阶贝塞尔函数，需要保证为偶数点 points.Insert(0, points[0]); ctx.PolyQuadraticBezierTo(points, true, true); } ctx.Close(); } var visual = new DrawingVisual(); using (var context = visual.RenderOpen()) { context.DrawGeometry(FillBrush, StrokePen, geometryTest); } _visualShape.Add(visual); } #region 内部方法 [Obsolete] protected override void OnRender(DrawingContext drawingContext) { //弃用，改为_visualShape填充实现 //drawingContext.DrawGeometry(FillBrush, StrokePen, BaseGeometry); } protected override int VisualChildrenCount => _visualShape.Count; protected override Visual GetVisualChild(int index) { if (index < 0 || index >= _visualShape.Count) { throw new ArgumentOutOfRangeException(); } return _visualShape[index]; } #endregion #region 曲线属性 private readonly VisualCollection _visualShape; protected Brush FillBrush { get; set; } = Brushes.Transparent; public Brush LineBrush { get; set; } = Brushes.DarkSeaGreen; protected double BorderThickness { get; set; } = 1.0; private Pen _defaultPen = null; protected Pen StrokePen { get { if (_defaultPen == null) { _defaultPen = new Pen(LineBrush, BorderThickness); } return _defaultPen; } set => _defaultPen = value; } #endregion } |
Github地址：https://github.com/Kybs0/WaveLineTextDemo
以上就是c# 实例——绘制波浪线（附源码）的详细内容，更多关于c# 绘制波浪线的资料请关注服务器之家其它相关文章！
原文链接：https://www.cnblogs.com/kybs0/p/11141190.html
