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[ASP.net教程]DrawTool画笔之图形笔


相关知识参考DrawTool画笔之纹理笔  , 图形笔的实现跟纹理笔的实现是一样的,重载Stroke的DrawCore方法,效果图:

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代码如下:

/// <summary>  /// 图形笔  /// </summary>  public class ImageStroke : Stroke  {    private string imageFile_;    private System.Windows.Media.ImageSource imageSource_;    private Point curPoint;    public ImageStroke(System.Windows.Input.StylusPointCollection points, DrawingAttributes da, string file)      : base(points, da)    {      this.imageFile_ = file;      this.imageSource_ = new System.Windows.Media.Imaging.BitmapImage(new Uri( this.imageFile_));    }    protected override void DrawCore(System.Windows.Media.DrawingContext drawingContext, DrawingAttributes drawingAttributes)    {      double num = drawingAttributes.Width + 20.0;      System.Windows.Media.StreamGeometry streamGeometry = new System.Windows.Media.StreamGeometry();      using (System.Windows.Media.StreamGeometryContext streamGeometryContext = streamGeometry.Open())      {        streamGeometryContext.BeginFigure((Point)base.StylusPoints[0], false, false);        drawingContext.DrawImage(this.imageSource_, new Rect(((Point)base.StylusPoints[0]).X - num / 2.0, ((Point)base.StylusPoints[0]).Y - num / 2.0, num, num));        this.curPoint = (Point)base.StylusPoints[0];        foreach (System.Windows.Input.StylusPoint current in base.StylusPoints)        {          ImageStroke.DrawImage(ref this.curPoint, (Point)current, num, drawingContext, this.imageSource_);        }      }    }    public static double GetDistance(Point a, Point b)    {      return System.Math.Abs(Point.Subtract(a, b).Length);    }    public static Point GetPointBetween(Point a, Point b, double len)    {      Vector vector = Point.Subtract(a, b);      vector.Normalize();      vector = Vector.Multiply(vector, len);      return Point.Subtract(a, vector);    }    public static void DrawImage(ref Point a, Point b, double width, System.Windows.Media.DrawingContext drawingContext, System.Windows.Media.ImageSource imageSource)    {      for (double distance = ImageStroke.GetDistance(a, b); distance >= width; distance = ImageStroke.GetDistance(a, b))      {        Point pointBetween = ImageStroke.GetPointBetween(a, b, width);        drawingContext.DrawImage(imageSource, new Rect(pointBetween.X - width / 2.0, pointBetween.Y - width / 2.0, width, width));        a = pointBetween;      }    }  }

 

实例应用可以参考纹理笔,在生成stroke对象时候使用ImageStroke然后将stroke添加到inkcanvas的strokes集合中