Antialiasing in .NET framework

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Antialiasing
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All the strings I've shown in the sample figures in this section have been nice and smooth That's because I'm using Windows XP with ClearType turned on If I turn that off, I go back to the old, blocky way of looking at things However, when I'm drawing strings, I don't have to settle for what the user specifies I can set the TextRenderingHint property of the Graphics object before I draw a string to one of the TextRenderingHint enumeration values, as shown inFigure 56
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Figure 56 Examples of the TextRenderingHint Enumeration
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Table 53 The Settings of the Built-in StringFormat Classes
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GenericDefault StringFormatFlags = 0 Alignment = Near LineAlignment = Near DigitSubstitutionMethod = User HotkeyPrefix = None No tab stops Trimming = Character GenericTypographic StringFormatFlags = LineLimit, NoClip Alignment = Near LineAlignment = Near DigitSubstitutionMethod = User HotkeyPrefix = None No tab stops Trimming = None
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In this case, SystemDefault shows what text looks like without any smoothing effects The SingleBitPerPixel setting does just what it says, although it's clearly not useful for anything that needs to look decent The AntiAlias and ClearType settings are two different algorithms for smoothing that are meant to make the text look good: one for any monitor, and one specifically for LCD displays The grid fit versions of the algorithms use extra hints to improve the appearance, as you can see from the examples Of course, as the quality improves, the rendering time also increases, and that's why you can set the option as appropriate for your application Furthermore, when drawing using one of the antialiasing algorithms, you can adjust the TextContrast property of a Graphics object The contrast ranges from 0 to 12, where 0 is the most contrast and 12 is the least, with 4 being the default The contrast makes fonts at smaller point sizes stand out more against the background
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Strings and Paths
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One more string-drawing trick that might interest you is the ability to add strings to graphics paths Because everything that's added to a path has both an outline and an interior that can be drawn separately, you can add strings to a path to achieve outline effects, as shown in Figure 57: // Need to pass in DPI = 100 for GraphicsUnit == Display GraphicsPath GetStringPath( string s, float dpi, RectangleF rect, Font font, StringFormat format) { GraphicsPath path = new GraphicsPath(); // Convert font size into appropriate coordinates float emSize = dpi * fontSizeInPoints / 72; pathAddString( s, fontFontFamily, (int)fontStyle, emSize, rect, format); return path; } void OutlineFontsForm_Paint(object sender, PaintEventArgs e) { Graphics g = eGraphics; string s = "Outline"; RectangleF rect = thisClientRectangle;
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Font font = thisFont; StringFormat format = StringFormatGenericTypographic; float dpi = gDpiY; using( GraphicsPath path = GetStringPath(s, dpi, rect, font, format) ) { gDrawPath(PensBlack, path); } }
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Figure 57 Using a GraphicsPath Object to Simulate an Outline-Only Font
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Notice that even though I have ClearType on and the TextRenderingHint set to SystemDefault, the outline path was not drawn smoothly As soon as the string was used to create a path, it stopped being text and became a shape, which is drawn smoothly or not based on the SmoothingMode property Also, you'll notice that I showed an example of a really big font (72-point) The string-as-path trick doesn't work very well at lower resolutions because of the translation of font family characters into a series of lines and curves Even more interesting uses of paths are available when you apply transforms, which you'll read about in 6: Advanced Drawing [ Team LiB ]
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Where Are We
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We've finished up the basics of drawing that we started in 4 In 6, we talk about advanced drawing topics, such as coordinate systems, regions, and transformations [ Team LiB ]
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