## WPF: How to apply a GeneralTransform to a Geometry data and return the new geometry?

Having some Geometry data and a Transform how can the transform be applied to the Geometry to get a new Geometry with it's data transformed ?

Ex: I Have a Path object that has it's Path.Data set to a PathGeometry object, I want to tranform **the points** of the PathGeometry object **in place** using a transform, and not apply a transform to the PathGeometry that will be used at render time.

P.S. I know that the Transform class has a method `Point Transform.Transform(Point p)`

that can be used to transform a Point but...is there a way to transform a arbitrary geometry at once?

Edit: See my repply for a currently found solution

You could try and use Geometry.Combine. It applies a transform during the combine. One catch is that Combine only works if your Geometry has area, so single lines will not work.

Here is a sample that worked for me.

PathGeometry geometry = new PathGeometry(); geometry.Figures.Add(new PathFigure(new Point(10, 10), new PathSegment[] { new LineSegment(new Point(10, 20), true), new LineSegment(new Point(20, 20), true) }, true)); ScaleTransform transform = new ScaleTransform(2, 2); PathGeometry geometryTransformed = Geometry.Combine(geometry, geometry, GeometryCombineMode.Intersect, transform);

**WPF+How+to+apply+a+GeneralTransform+to+a+Geometry+data+ ,** Having some Geometry data and a Transform how can the transform be applied to the Geometry to get a new Geometry with it's data� WPF: How to apply a GeneralTransform to a Geometry data and return the new geometry? (2) Having some Geometry data and a Transform how can the transform be applied to the Geometry to get a new Geometry with it's data transformed ?

I've found a solution with which arbitrary tranform can be applied to a path geometry, thanks to Todd White's answer:

Basically Geometry.Combine is used to combine the desired geometry with Geometry.Empty using Union, and the desired transform is given. The resulting geometry is transformed with the given transform.

PathGeometry geometryTransformed = Geometry.Combine(Geometry.Empty, geometry, GeometryCombineMode.Union, transform);

**PathGeometry.cs,** The new Geometry will be based on the current value of all properties. /// </param > public static PathGeometry CreateFromGeometry(Geometry geometry) { if� c# - WPF: How to apply a GeneralTransform to a Geometry data and return the new geometry? Having some Geometry data and a Transform how can the transform be applied to the Geometry to get a new Geometry with it's data transformed ? Ex: I Have a Path object that has it's Path.Data set to a…

This is what I found you can do to get a transformed geometry with all of the figure information intact:

var geometry = new PathGeometry(); geometry.Figures.Add(new PathFigure(new Point(10, 10), new PathSegment[] { new LineSegment(new Point(10, 20), true), new LineSegment(new Point(20, 20), true) }, true)); geometry.Transform = new ScaleTransform(2, 2); var transformedGeometry = new PathGeometry (); // this copies the transformed figures one by one into the new geometry transformedGeometry.AddGeometry (geometry);

**Path figure values after transform has been applied.,** Windows Presentation Foundation (WPF) Once I apply a transform to the Path object is there an easy way to I don't think you can get the transformed path geometry in the way http://stackoverflow.com/questions/249971/wpf-how-to- apply-a-generaltransform-to-a-geometry-data-and-return-the-new-� Use a StreamGeometry when you need to describe a complex geometry but do not want the overhead of supporting data binding, animation, or modification. For example, because of its efficiency, the StreamGeometry class is a good choice for describing adorners.

I didn't use accepted answer since it was returning geometry in format different from the original one, so I used this:

Geometry inputGeometry = new PathGeometry(); var inputGeometryClone = inputGeometry.Clone(); // we need a clone since in order to // apply a Transform and geometry might be readonly inputGeometryClone.Transform = new TranslateTransform(); // applying some transform to it var result = inputGeometryClone.GetFlattenedPathGeometry();

**Cut geometry,** Cut a geometry along a polyline. Data � New Basemap Style; New Web Map; New Web Scene; New Story Map Use case. You might cut a polygon representing a large parcel to subdivide it into Loop through the returned list of part geometries. <UserControl x:Class="ArcGISRuntime.WPF.Samples. CutGeometry. It returns a Geometry, but that is an abstract class. I am creating a text shape and want to cache this geometry. That BuildGeometry could returns different types, feels suspect and therefore I may

None of the quick solutions based on Geometry.Combine works in the case of path made of a single LineElement. So I solved the problem the hard way, like this (But I am also limited to PathGeometry):

public static class GeometryHelper { public static PointCollection TransformPoints(PointCollection pc, Transform t) { PointCollection tp = new PointCollection(pc.Count); foreach (Point p in pc) tp.Add(t.Transform(p)); return tp; } public static PathGeometry TransformedGeometry(PathGeometry g, Transform t) { Matrix m = t.Value; double scaleX = Math.Sqrt(m.M11 * m.M11 + m.M21 * m.M21); double scaleY = (m.M11 * m.M22 - m.M12 * m.M21) / scaleX; PathGeometry ng = g.Clone(); foreach (PathFigure f in ng.Figures) { f.StartPoint = t.Transform(f.StartPoint); foreach (PathSegment s in f.Segments) { if (s is LineSegment) (s as LineSegment).Point = t.Transform((s as LineSegment).Point); else if (s is PolyLineSegment) (s as PolyLineSegment).Points = TransformPoints((s as PolyLineSegment).Points, t); else if (s is BezierSegment) { (s as BezierSegment).Point1 = t.Transform((s as BezierSegment).Point1); (s as BezierSegment).Point2 = t.Transform((s as BezierSegment).Point2); (s as BezierSegment).Point3 = t.Transform((s as BezierSegment).Point3); } else if (s is PolyBezierSegment) (s as PolyBezierSegment).Points = TransformPoints((s as PolyBezierSegment).Points, t); else if (s is QuadraticBezierSegment) { (s as QuadraticBezierSegment).Point1 = t.Transform((s as QuadraticBezierSegment).Point1); (s as QuadraticBezierSegment).Point2 = t.Transform((s as QuadraticBezierSegment).Point2); } else if (s is PolyQuadraticBezierSegment) (s as PolyQuadraticBezierSegment).Points = TransformPoints((s as PolyQuadraticBezierSegment).Points, t); else if (s is ArcSegment) { ArcSegment a = s as ArcSegment; a.Point = t.Transform(a.Point); a.Size = new Size(a.Size.Width * scaleX, a.Size.Height * scaleY); // NEVER TRIED } } } return ng; } }

**c#,** WPF: How to apply a GeneralTransform to a Geometry data and return the new geometry? 发表于 2008-10-30 12:15:46. 活跃于 2014-12-17 09:38:47. Defines functionality that enables transformations in a 2-D plane. Transformations include rotation (RotateTransform), scale (ScaleTransform), skew (SkewTransform), and translation (TranslateTransform). This class hierarchy differs from the Matrix structure because it is a class and it supports animation and enumeration semantics.

**WPF:如何将GeneralTransform应用于几何数据并返回新几何?,** Data设置为PathGeothology对象,我想通过转换转换转换到位的PathGeothology 对象的点,而不是将转换应用于呈现时将使用 WPF: How to apply a GeneralTransform to a Geometry data and return the new geometry? 来源: link� var path = new Path(); path.Data = Geometry.Parse("M 100,200 C 100,25 400,350 400,175 H 280"); Path.Data is of type Geometry. Using Reflector JustDecompile (eff Red Gate), I looked at the definition of Geometry for its TypeConverterAttribute (which the xaml serializer uses to convert values of type string to Geometry).

**Plot Geometry,** Geometries in the Canvas are rendered as Paths whose Data property follows the for each shapes type (points, line, rings) that return their path data as svg strings. Geometry) = let shape = geom |> toShape let path = new Path() let data RenderTranform can be used to scale, skew, rotate and translate a wpf control. Hi. I need to check if a circle is "inside" another shape (rectangle, polygon). I was thinking of checking if the edge of the circle is inside the edge of the other shape, but I don't have any idea on how to accomplish this.

**WPF: Как применить GeneralTransform к данным Geometry и ,** Вопрос по теме: c#, .net, wpf, transform, geometry. Data, установленный для объекта PathGeometry, я хочу преобразовать Add(new PathFigure(new Point(10, 10), new PathSegment[] { new Transform(p)); return tp; } public static PathGeometry TransformedGeometry(PathGeometry g, Transform t) { Matrix m = t . WPF already provides a few value converts, but you will soon need to implement your own converts. To do this, add a class to your project and call it [SourceType]To[TargetType]Converter . This is a common naming for value converters.

##### Comments

- If you actually find a way to do this ... I'm using it too. Heh heh.
- The only problem is that the combined geometry is not the same as the original geometry. Differences aren't big but might be important.
- This appears to be the correct way to do it, as no StandardFlatteningTolerance appears to be applied.
- Not sure why this was down voted as it seems the only correct answer.
- Do you actually get the transformed geometry? Applying CreateFromGeometry on a PathGeometry returns the same geometry (same points). You're not transforming the geometry but simply adding the transform property.
- you can transform anything, even sizes and angles, besides, I know that you can transform points individually, and also my geometry is not frozen. I wanted to know if there's a framework way to apply transformations to an geometry object as a whole.