在uwp中将多边形/椭圆添加到inkcanvas

Question

我正在使用Microsoft的开源项目的Windows-universal-samples-master \ Samples \ InkAnalysis \ InkAnalysis.sln。它可以分析您绘制的形状，并转换为多边形或椭圆形。

Name                           Value                                                                                                                                                                                                
----                           -----                                                                                                                                                                                                
_id                            59cbf243ef32b7bbe22654b4                                                                                                                                                                             
name                           Gru Hypue KS-T d3-31 9 b a                                                                                                                                                                           
system_id                      3288878                                                                                                                                                                                              
materials                      {material_id, material_name, share}                                                                                                                                                                  
systems                        {{ "_id" : ObjectId("59cba528ef32b7bbe28a7640"), "id" : 3288878, "edsm_id" : 2749852, "name" : "Gru Hypue KS-T d3-31", "x" : -4990.84375, "y" : -935.71875, "z" : 13387.15625, "population" : 1000...
y                              {-935.71875}                                                                                                                                                                                         
systemname                     {Gru Hypue KS-T d3-31}                                                                                                                                                                               
z                              {13387.15625}                                                                                                                                                                                        
x                              {-4990.84375} 

所有转换后的形状都被绘制到＆＃34; canvas＆＃34;，而不是＆＃34; inkCanvas＆＃34;，因此它们无法保存为墨迹。

如何将形状添加到＆＃34; inkCanvas＆＃34;？

Answer 1

我们可以使用InkStrokeContainer.AddStroke将InkStroke对象添加到InkStrokeContainer管理的集合中。如果形状是多边形，我们可以从InkAnalysisInkDrawing.Points获取点，并通过InkStrokeBuilder方法将它们设置为CreateStrokeFromInkPoints。

例如：

private void AddPolygonToInkCanvas(InkAnalysisInkDrawing shape)
{
    var strokeBuilder = new InkStrokeBuilder();
    var strokes = inkCanvas.InkPresenter.StrokeContainer.GetStrokes();
    strokeBuilder.SetDefaultDrawingAttributes(strokes[0].DrawingAttributes);
    System.Numerics.Matrix3x2 matr = strokes[0].PointTransform;
    List<InkPoint> inkPointslist = new List<InkPoint>();
    foreach (var item in shape.Points)
    {
        var intpoint = new InkPoint(new Point(item.X, item.Y), 0.5f);
        inkPointslist.Add(intpoint);
    }
    var lastintpoint = new InkPoint(new Point(shape.Points[0].X, shape.Points[0].Y), 0.5f);
    inkPointslist.Add(lastintpoint);
    IReadOnlyList<InkPoint> inkPoints = inkPointslist;
    InkStroke stroke = strokeBuilder.CreateStrokeFromInkPoints(inkPoints, matr);  
    inkCanvas.InkPresenter.StrokeContainer.AddStroke(stroke);
}

如果形状是椭圆形，据我所知，我们无法将其添加到InkCanvas。我们不能得到所有的椭圆，它只提供4个点。