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- Drawing Shapes in WPF. This article is an introduction to graphics programming in XAML and WPF. In this article, I discuss various graphics objects including lines, rectangles, ellipses, and paths and how to draw them using XAML and WPF.
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Using tool improperly can yield many errors. It is advised to first write the code how you want it, and only then add the tool keyword to the top. Also, make sure to separate code that runs in-editor from code that runs in-game. This way, you can find bugs more easily.
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-->This topic gives an overview of how to draw with Shape objects. A Shape is a type of UIElement that enables you to draw a shape to the screen. Because they are UI elements, Shape objects can be used inside Panel elements and most controls.
Windows Presentation Foundation (WPF) offers several layers of access to graphics and rendering services. At the top layer, Shape objects are easy to use and provide many useful features, such as layout and participation in the Windows Presentation Foundation (WPF) event system.
Shape Objects
WPF provides a number of ready-to-use Shape objects. All shape objects inherit from the Shape class. Available shape objects include Ellipse, Line, Path, Polygon, Polyline, and Rectangle. Shape objects share the following common properties.
Stroke: Describes how the shape's outline is painted.
StrokeThickness: Describes the thickness of the shape's outline.
Fill: Describes how the interior of the shape is painted.
Data properties to specify coordinates and vertices, measured in device-independent pixels.
Because they derive from UIElement, shape objects can be used inside panels and most controls. The Canvas panel is a particularly good choice for creating complex drawings because it supports absolute positioning of its child objects.
The Line class enables you to draw a line between two points. The following example shows several ways to specify line coordinates and stroke properties.
The following image shows the rendered Line.
Although the Line class does provide a Fill property, setting it has no effect because a Line has no area.
Another common shape is the Ellipse. 1password 5 1 download free. Create an Ellipse by defining the shape's Width and Height properties. To draw a circle, specify an Ellipse whose Width and Height values are equal.
The following image shows an example of a rendered Ellipse.
Using Paths and Geometries
The Path class enables you to draw curves and complex shapes. These curves and shapes are described using Geometry objects. To use a Path, you create a Geometry and use it to set the Path object's Data property.
There are a variety of Geometry objects to choose from. The LineGeometry, RectangleGeometry, and EllipseGeometry classes describe relatively simple shapes. To create more complex shapes or create curves, use a PathGeometry.
PathGeometry and PathSegments
PathGeometry objects are comprised of one or more PathFigure objects; each PathFigure represents a different 'figure' or shape. Each PathFigure is itself comprised of one or more PathSegment objects, each representing a connected portion of the figure or shape. Segment types include the following: LineSegment, BezierSegment, and ArcSegment.
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In the following example, a Path is used to draw a quadratic Bezier curve.
The following image shows the rendered shape.
For more information about PathGeometry and the other Geometry classes, see the Geometry Overview.
XAML Abbreviated Syntax
In Extensible Application Markup Language (XAML), you may also use a special abbreviated syntax to describe a Path. In the following example, abbreviated syntax is used to draw a complex shape.
The following image shows a rendered Path.
The Data attribute string begins with the 'moveto' command, indicated by M, which establishes a start point for the path in the coordinate system of the Canvas. Path data parameters are case-sensitive. The capital M indicates an absolute location for the new current point. A lowercase m would indicate relative coordinates. The first segment is a cubic Bezier curve beginning at (100,200) and ending at (400,175), drawn using the two control points (100,25) and (400,350). This segment is indicated by the C command in the Data attribute string. Again, the capital C indicates an absolute path; the lowercase c would indicate a relative path.
The second segment begins with an absolute horizontal 'lineto' command H, which specifies a line drawn from the preceding subpath's endpoint (400,175) to a new endpoint (280,175). Because it is a horizontal 'lineto' command, the value specified is an x-coordinate.
For the complete path syntax, see the Data reference and Create a Shape by Using a PathGeometry.
Painting Shapes
Brush objects are used to paint a shape's Stroke and Fill. In the following example, the stroke and fill of an Ellipse are specified. Note that valid input for brush properties can be either a keyword or hexadecimal color value. For more information about available color keywords, see properties of the Colors class in the System.Windows.Media namespace.
The following image shows the rendered Ellipse.
Alternatively, you can use property element syntax to explicitly create a SolidColorBrush object to paint the shape with a solid color.
The following illustration shows the rendered shape.
You can also paint a shape's stroke or fill with gradients, images, patterns, and more. The foundry nuke studio 12 1v1. For more information, see the Painting with Solid Colors and Gradients Overview.
Stretchable Shapes
The Line, Path, Polygon, Polyline, and Rectangle classes all have a Stretch property. This property determines how a Shape object's contents (the shape to be drawn) is stretched to fill the Shape object's layout space. A Shape object's layout space is the amount of space the Shape is allocated by the layout system, because of either an explicit Width and Height setting or because of its HorizontalAlignment and VerticalAlignment settings. For additional information on layout in Windows Presentation Foundation, see Layout overview.
The Stretch property takes one of the following values:
None: The Shape object's contents are not stretched.
Fill: The Shape object's contents are stretched to fill its layout space. Aspect ratio is not preserved.
Uniform: The Shape object's contents are stretched as much as possible to fill its layout space while preserving its original aspect ratio.
UniformToFill: The Shape object's contents are stretched to completely fill its layout space while preserving its original aspect ratio.
Note that, when a Shape object's contents are stretched, the Shape object's outline is painted after the stretching.
In the following example, a Polygon is used to draw a very small triangle from (0,0) to (0,1) to (1,1). The Polygon object's Width and Height are set to 100, and its stretch property is set to Fill. As a result, the Polygon object's contents (the triangle) are stretched to fill the larger space.
Transforming Shapes
The Transform class provides the means to transform shapes in a two-dimensional plane. The different types of transformation include rotation (RotateTransform), scale (ScaleTransform), skew (SkewTransform), and translation (TranslateTransform).
A common transform to apply to a shape is a rotation. To rotate a shape, create a RotateTransform and specify its Angle. An Angle of 45 rotates the element 45 degrees clockwise; an angle of 90 rotates the element 90 degrees clockwise; and so on. Set the CenterX and CenterY properties if you want to control the point about which the element is rotated. These property values are expressed in the coordinate space of the element being transformed. CenterX and CenterY have default values of zero. Finally, apply the RotateTransform to the element. If you don't want the transform to affect layout, set the shape's RenderTransform property.
In the following example, a RotateTransform is used to rotate a shape 45 degrees about the shape's top left corner (0,0).
In the next example, another shape is rotated 45 degrees, but this time it's rotated about the point (25,50).
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The following illustration shows the results of applying the two transforms.
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In the previous examples, a single transform was applied to each shape object. To apply multiple transforms to a shape (or any other UI element), use a TransformGroup.
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See also
