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>publicclassImageStroke : Stroke
{PRivatestringimageFile_;privateSystem.Windows.Media.ImageSource imageSource_;privatePoint curPoint;publicImageStroke(System.Windows.Input.StylusPointCollection points, DrawingAttributes da,stringfile)
:base(points, da)
{this.imageFile_ =file;this.imageSource_ =newSystem.Windows.Media.Imaging.BitmapImage(newUri(this.imageFile_));
}protectedoverridevoidDrawCore(System.Windows.Media.DrawingContext drawingContext, DrawingAttributes drawingAttributes)
{doublenum = drawingAttributes.Width +20.0;
System.Windows.Media.StreamGeometry streamGeometry=newSystem.Windows.Media.StreamGeometry();using(System.Windows.Media.StreamGeometryContext streamGeometryContext =streamGeometry.Open())
{
streamGeometryContext.BeginFigure((Point)base.StylusPoints[0],false,false);
drawingContext.DrawImage(this.imageSource_,newRect(((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 currentinbase.StylusPoints)
{
ImageStroke.DrawImage(refthis.curPoint, (Point)current, num, drawingContext,this.imageSource_);
}
}
}publicstaticdoubleGetDistance(Point a, Point b)
{returnSystem.Math.Abs(Point.Subtract(a, b).Length);
}publicstaticPoint GetPointBetween(Point a, Point b,doublelen)
{
Vector vector=Point.Subtract(a, b);
vector.Normalize();
vector=Vector.Multiply(vector, len);returnPoint.Subtract(a, vector);
}publicstaticvoidDrawImage(refPoint a, Point b,doublewidth, System.Windows.Media.DrawingContext drawingContext, System.Windows.Media.ImageSource imageSource)
{for(doubledistance = ImageStroke.GetDistance(a, b); distance >= width; distance =ImageStroke.GetDistance(a, b))
{
Point pointBetween=ImageStroke.GetPointBetween(a, b, width);
drawingContext.DrawImage(imageSource,newRect(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