Figure 919 Three subpaths in VS .NET

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Figure 919 Three subpaths
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The Reverse method can be used to reverse the order of points in a path, and theReset method to remove (empty) all points from a path The following code snippet shows how to use these two methods:
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pathReverse(); pathReset();
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925 The Graphics Path Iterator
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As mentioned earlier, a graphics path is a set of graphics subpaths We can determine the number of subpaths and the related data of a subpath by using the GraphicsPathIterator class This class allows us to iterate through all the subpaths of a graphics path The Count and SubpathCount properties of GraphicsPathIterator return the total number of points and the number of subpaths in a graphics path, respectively The CopyData method can be used to copy the points of a path and their types It returns the number of points, which is also the number of types copied The HasCurves method returns true if a path has curves in it; otherwise it returns false The NextMarker method moves the iterator to the next marker in the path The NextPathType method returns the starting and ending indices of the next group of data points that all have the same type The NextSubpath method returns the starting index, ending index, and a Boolean value of true if the subpath is closed (false if the subpath is open), and moves to the next subpath The Rewind method resets the iterator to the beginning of the path Listing 912 creates and draws a graphics path and uses GraphicsPathIterator to find and show the data for all subpaths
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Listing 912 Iterating through subpaths
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private void GraphicsPathIterator_Paint(object sender, SystemWindowsFormsPaintEventArgs e) { // Get the Graphics object Graphics g = eGraphics; // Create a rectangle Rectangle rect = new Rectangle(50, 50, 100, 50); // Create a graphics path GraphicsPath path = new GraphicsPath(); PointF[] ptsArray = { new PointF(20, 20), new PointF(60, 12), new PointF(100, 20) }; // Add a curve, a rectangle, an ellipse, and a line pathAddCurve(ptsArray); pathAddRectangle(rect); rectY += 60; pathAddEllipse(rect); pathAddLine(120, 50, 220, 100); // Draw path gDrawPath(PensBlue, path); // Create a graphics path iterator GraphicsPathIterator pathIterator = new GraphicsPathIterator(path); // Display total points and subpaths
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This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks string str = "Total points = " + pathIteratorCountToString(); str += ", Sub paths = " + pathIteratorSubpathCountToString(); MessageBoxShow(str); // Rewind pathIteratorRewind(); // Read all subpaths and their properties for(int i=0; i<pathIteratorSubpathCount; i++) { int strtIdx, endIdx; bool bClosedCurve; pathIteratorNextSubpath(out strtIdx, out endIdx, out bClosedCurve); str = "Start Index = " + strtIdxToString() + ", End Index = " + endIdxToString() + ", IsClosed = " + bClosedCurveToString(); MessageBoxShow(str); } }
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93 Graphics Containers
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Suppose that you have a surface with 100 different graphics objects (text, shapes, and images), and you want to anti-alias just one object, perhaps for performance reasons Without graphics containers, you would have to create a Graphics object and set the SmoothingMode property to AntiAlias which would set anti-aliasing for everything drawn on the object How do you set the smoothing mode of only one particular object on a surface That's where containers come in The Graphics class provides methods and properties to define the attributes of graphics objects For example, you can set the rendering quality of text using the TextRenderingHint property The smoothing mode represents the quality of the graphics objects, the compositing quality represents the quality of composite images, the compositing mode represents whether pixels from a source image overwrite or are combined with background pixels, and the interpolation mode represents how intermediate values between two endpoints are calculated These attributes are set with the SmoothingMode, CompositingMode, CompositingQuality, and InterpolationMode properties which are applicable for an entire Graphics object For example, if you set theSmoothingMode property of a Graphics object to AntiAlias, all graphics objects attached to that Graphics object will be anti-aliased A graphics container is a temporary graphics object that acts as a canvas for graphics shapes, allowing an application to set a container property separately from the main Graphics object An application can apply properties to aGraphics object within a container, and these properties won't be available outside of that container Thus we can selectively apply properties to Graphics objects In Figure 920, for example, aGraphics object includes three graphics containers, each with different properties These properties are not available outside of their containers All graphics objects inside a container may be affected by the container property It's also possible to have nested containers
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