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Figure 34: Removing a rectangle with a retained mode API
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Figure 35: Removing a rectangle with an immediate mode API
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A retained mode API enables you to do the following: Construct a set of graphics elements Change properties of the graphics elements Build a graph representing the relationship between those elements Manipulate the graph structure A retained mode graphics API is easier to use than an immediate mode API and enables the underlying system to provide automatic performance optimizations such as drawing incrementally and avoiding the drawing of occluded shapes Silverlight provides a retained mode system to optimize for ease of use, animating vector graphics content, and for building applications composed of UI controls In Silverlight, you can construct the retained mode graph declaratively with a XAML le:
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<Canvas xmlns="http://schemasmicrosoftcom/client/2007"> <! triangle > <Path Fill="Green" Data="F1 M 128,12L 12,224L 224,224" /> <! rectangle > <Rectangle Fill="Blue" CanvasLeft="96" CanvasTop="160" Width="256" Height="224" /> <! circle > <Ellipse Fill="Red" CanvasLeft="230" CanvasTop="288" Width="200" Height="200" /> </Canvas>
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Canvas canvas = new Canvas(); // // Make the triangle // Path path = new Path(); pathFill = new SolidColorBrush(ColorsGreen); PathFigure pathFigure = new PathFigure(); pathFigureStartPoint = new Point(128, 12); LineSegment lineSegment1 = new LineSegment(); lineSegment1Point = new Point(12, 224); pathFigureSegmentsA dd(lineSegment1); LineSegment lineSegment2 = new LineSegment(); lineSegment2Point = new Point(224, 224); pathFigureSegmentsA dd(lineSegment2); PathGeometry pathGeometry = new PathGeometry(); pathGeometryFigures = new PathFigureCollection(); pathGeometryFiguresA dd(pathFigure); pathData = pathGeometry; canvasChildrenA dd(path); // // Make the rectangle // Rectangle rectangle = new Rectangle(); rectangleFill = new SolidColorBrush(ColorsBlue); CanvasSetLeft(rectangle, 96); CanvasSetTop(rectangle, 160); rectangleWidth = 256; rectangleHeight = 224; canvasChildrenA dd(rectangle); // // Make the circle //
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Ellipse ellipse = new Ellipse(); ellipseFill = new SolidColorBrush(ColorsRed); CanvasSetLeft(ellipse, 230); CanvasSetTop(ellipse, 288); ellipseWidth = 200; ellipseHeight = 200; canvasChildrenA dd(ellipse);
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Cross Platform Consistency An important goal for the Silverlight graphics engine is to enable a developer to write his or her application once and have it run consistently across a variety of operating systems and browsers Each operating system has a local graphics library However, these local operating system graphics libraries differ signi cantly in feature set, performance, and image quality To ensure cross-platform consistency and performance, Silverlight includes its own rendering engine Tools Silverlight is capable of loading vector and image content from designer tools and integrating with developer written application code For vector graphics and animation, you can use Expression Design and Expression Blend to generate XAML content for use with the Silverlight runtime There are also a variety of free XAML exporters available to generate XAML content including an Adobe Illustrator exporter, an XPS print driver, and several others Balancing Image Quality and Speed In addition to displaying static XAML, Silverlight provides real-time animation at 60 frames per second However, real-time performance is highly dependent on the application content, the speci c hardware con guration of the target machine, the resolution of the target display, the operating system, and the hosting Web browser When an application does not meet the 60 frame per second goal, the Silverlight team uses the following two options to improve performance:
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1 Make optimizations to components in the Silverlight runtime 2 Lower image quality to achieve better speed
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Reducing image quality for speed is the most controversial optimization technique The Silverlight application must look good However, it is possible to trade off image quality in a manner that is generally acceptable to the end user For example, vector graphics rendering makes some quality sacri ces but still maintains an acceptable visual bar On the other hand, end users have a much higher standard for text quality and the Silverlight runtime spends more CPU time rendering text clearly
Graphics Elements
As previously discussed, the Silverlight runtime can load and draw vector graphics XAML on a variety of platforms The graphics elements can also be speci ed programmatically when you use C# or JavaScript This section describes the elements you can use to display vector graphics and images in your applications
Shapes This section starts the graphics element discussion with the base class for all graphics primitives: the Shape element The Shape element provides the following:
A Fill property to specify how the shape interior is drawn A Stretch property to indicate how a Shape element stretches to a speci ed Width and Height Stroke and StrokeThickness properties to specify the pen behavior The elements that derive from Shape define the shape s geometry These elements include Rectangle, Ellipse, Line, Polygon, Polyline, and Path