Графический редактор - часть 1

Динамически нарисовать линию

/// 

/// Creates a line at run-time
/// 

public void CreateALine()
{
    // Create a Line
    Line redLine = new Line();
    redLine.X1 = 50;
    redLine.Y1 = 50;
    redLine.X2 = 200;
    redLine.Y2 = 200;

    // Create a red Brush
    SolidColorBrush redBrush = new SolidColorBrush();
    redBrush.Color = Colors.Red;

    // Set Line's width and color
    redLine.StrokeThickness = 4;
    redLine.Stroke = redBrush;

    // Add line to the Grid.
    LayoutRoot.Children.Add(redLine);
}

Сворачивающаяся панель 

в XAML файле в нужном гриде(Grid) добавим 

<Grid.RenderTransform>
   <TranslateTransform X="0" />
</Grid.RenderTransform> 

далее в коде

(gridDrawPanel.RenderTransform as TranslateTransform).X = 120;

PolyLine

SolidColorBrush yellowBrush = new SolidColorBrush();
            yellowBrush.Color = Colors.Yellow;
            SolidColorBrush blackBrush = new SolidColorBrush();
            blackBrush.Color = Colors.Black;
            // Create a polyline
            Polyline yellowPolyline = new Polyline();
            yellowPolyline.Stroke = blackBrush;
            yellowPolyline.StrokeThickness = 4;
            // Create a collection of points for a polyline
            System.Windows.Point Point1 = new System.Windows.Point(10, 100);
            System.Windows.Point Point2 = new System.Windows.Point(100, 200);
            System.Windows.Point Point3 = new System.Windows.Point(200, 30);
            System.Windows.Point Point4 = new System.Windows.Point(250, 200);
            System.Windows.Point Point5 = new System.Windows.Point(200, 150);
            PointCollection polygonPoints = new PointCollection();

            polygonPoints.Add(Point1);
            polygonPoints.Add(Point2);
            polygonPoints.Add(Point3);
            polygonPoints.Add(Point4);
            polygonPoints.Add(Point5);

            // Set Polyline.Points properties
            yellowPolyline.Points = polygonPoints;

            // Add polyline to the page
            cnvDrawPoly.Children.Add(yellowPolyline);

Ссылка 

Path

/// 

/// Creates a blue path with black stroke
/// 
public void CreateAPath()
{
    // Create a blue and a black Brush
    SolidColorBrush blueBrush = new SolidColorBrush();
    blueBrush.Color = Colors.Blue;
    SolidColorBrush blackBrush = new SolidColorBrush();
    blackBrush.Color = Colors.Black;

    // Create a Path with black brush and blue fill
    Path bluePath = new Path();
    bluePath.Stroke = blackBrush;
    bluePath.StrokeThickness = 3;
    bluePath.Fill = blueBrush;

    // Create a line geometry
    LineGeometry blackLineGeometry = new LineGeometry();
    blackLineGeometry.StartPoint = new Point(20, 200);
    blackLineGeometry.EndPoint = new Point(300, 200);

    // Create an ellipse geometry
    EllipseGeometry blackEllipseGeometry = new EllipseGeometry();
    blackEllipseGeometry.Center = new Point(80, 150);
    blackEllipseGeometry.RadiusX = 50;
    blackEllipseGeometry.RadiusY = 50;

    // Create a rectangle geometry
    RectangleGeometry blackRectGeometry = new RectangleGeometry();
    Rect rct = new Rect();
    rct.X = 80;
    rct.Y = 167;
    rct.Width = 150;
    rct.Height = 30;
    blackRectGeometry.Rect = rct;

    // Add all the geometries to a GeometryGroup.
    GeometryGroup blueGeometryGroup = new GeometryGroup();
    blueGeometryGroup.Children.Add(blackLineGeometry);
    blueGeometryGroup.Children.Add(blackEllipseGeometry);
    blueGeometryGroup.Children.Add(blackRectGeometry);

    // Set Path.Data
    bluePath.Data = blueGeometryGroup;
    LayoutRoot.Children.Add(bluePath);

}

Ссылка

Path.QuadraticBezierSegment

PathGeometry pg = new PathGeometry();
                PathFigure pf = new PathFigure();
                pf.StartPoint = new Point(10, 100);
                pf.IsFilled = false;
                QuadraticBezierSegment qbs = new QuadraticBezierSegment();
                qbs.Point1 = new Point(120, 200);
                qbs.Point2 = new Point(300, 100);
                pf.Segments.Add(qbs);
               
                qbs = new QuadraticBezierSegment();
                qbs.Point1 = new Point(320, 200);
                qbs.Point2 = new Point(300, 100);
                pf.Segments.Add(qbs);

                pg.Figures.Add(pf);

                GeometryGroup gg = new GeometryGroup();
                gg.Children.Add(pg);
                System.Windows.Shapes.Path path = (System.Windows.Shapes.Path)cnvDrawPoly.Children[4];
                path.Data = gg;