Figure 53 Using system colors to draw graphics objects in .NET

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Figure 53 Using system colors to draw graphics objects
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Note
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When you create pens using SystemPens, you cannot modify the width or other properties of the pen The code will compile but will throw an unhandled exception when executed If you create a pen using SystemColors, however, you can modify its width like this: Pen pn = new Pen(SystemColorsHighlightText); PnWidth = 4;
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524 The ColorConverter and ColorTranslator Classes
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The ColorConverter class is used to convert colors from one data type to another This class is inherited from the TypeConverter class, which defines the functionality for conversion of types and accessing values and properties of types The TypeConverter class serves as a base class for many conversion classes, and ColorConverter and FontConverter are two of them We will discussFontConverter in more detail later in this chapter Some of the common methods of the TypeConverter class (which are available in theColorConverter class) are described in
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Table 52
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Table 52 Common TypeConverter methods
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Method CanConvertFrom Description Takes a type as a parameter and returns true if the converter can convert an object to the type of the converter; otherwise returns false CanConvertTo Takes a type as a parameter and returns true if the converter can convert an object to a given type; otherwise returns false ConvertFrom ConvertTo GetStandardValues Converts an object to the type of the converter and returns the converted object Converts a specified object to a new type and returns the object Returns a collection of standard values (collection type) for the data type for which this type converter is designed Identifies whether this object supports a standard set of values
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GetStandardValuesSupported
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Listing 54 uses the ColorConverter class methods to convert colors We store a color in a string and call the ConvertFromString method, which returns the Color object Later we will use theColor objects to create two brushes that we will use to fill a rectangle and an ellipse
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Listing 54 Using the ColorConverter class to convert colors
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private void ColorConvert_Click(object sender, SystemEventArgs e) { Graphics g = thisCreateGraphics(); gClear(thisBackColor); string str = "#FF00FF"; ColorConverter clrConverter = new ColorConverter(); Color clr1 = (Color)clrConverterConvertFromString(str); // Use colors SolidBrush clr2 = new SolidBrush(clr1); SolidBrush clr3 = new SolidBrush(clr1); // Draw GDI+ objects gFillEllipse(clr2, 10, 10, 50, 50); gFillRectangle(clr3, 60, 10, 50, 50); // Dispose of objects clr2Dispose(); clr3Dispose(); gDispose(); } Figure 54 shows the output from Listing 54
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Figure 54 Converting colors
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The ColorTranslator class provides methods to translate colors to and from HTML, OLE, and Win32 color values These methods are useful when you're using legacy color structures that pre-date the NET Framework For example, you may have legacy code that gives the HTML color representation of a color Table 53 describes the methods of the ColorTranslator class All of the methods are static Listing 55 uses the ColorTranslator class to translate colors from Win32 and HTML colors Later these colors will be used to create brushes
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Listing 55 Translating colors
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private void ColorTranslator_Click(object sender, SystemEventArgs e) { Graphics g = thisCreateGraphics(); // Translate colors Color win32Color = ColorTranslatorFromWin32(0xFF0033); Color htmlColor = ColorTranslatorFromHtml("#00AAFF"); // Use colors SolidBrush clr1 = new SolidBrush(win32Color); SolidBrush clr2 = new SolidBrush(htmlColor); // Draw GDI+ objects gFillEllipse(clr1, 10, 10, 50, 50); gFillRectangle(clr2, 60, 10, 50, 50); // Dispose of objects clr1Dispose(); clr2Dispose(); gDispose(); }
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Table 53 ColorTranslator methods
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Method FromHtml FromOle FromWin32 ToHtml ToOle ToWin32 Description Translates from an HTML color representation to aColor structure Translates from an OLE color value to aColor structure Translates from a Windows color value to aColor structure Translates from a Color structure to an HTML color representation Translates from a Color structure to an OLE color Translates from a Color structure to a Windows color
In a manner similar to the "from" methods just discussed, you can translate a Color structure into Win32, HTML, and OLE values using the ToWin32, ToHtml, and ToOle methods, respectively