Shapes, Text, and Images in Java

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16 Shapes, Text, and Images
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Figure 16-29
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Unlike weight and posture, which may be characteristics of the font itself, position is normally something that is implemented by the software that renders the text JavaFX takes care of this for you Font Size The font size determines the height of the font It is specified not in pixels, but in points, where one point is 1/72nd of an inch On a screen with a resolution of 72dpi, a pixel would also be 1/72nd of an inch tall, so in this case the font size would be the same as its height in pixels On a 300dpi printer, however, a point would still be approximately 1/72nd of an inch but would now correspond to just over 4 pixels on the paper surface The effect of the definition of a point is that a glyph in a 72-point font would be approximately an inch tall on both the screen and on the printed page, despite the fact that these devices have very different resolutions Font sizes are usually integers, but JavaFX allows you to specify a nonintegral font size, so 95 would be valid
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Fonts such as Tahoma,Tahoma Bold, and Times New Roman are physical fonts Physical fonts are fonts for which the data files that define the shapes of the characters are actually installed on the host computerThe set of fonts that are installed and where they reside are platform-dependentThird-party software, such as word processing applications, may install additional fonts On the Windows platform, you can see all the available fonts by opening the Fonts applet in the Control Panel, an example of which was shown in Figure 16-28 A few physical fonts are always guaranteed to be installed on any computer that has a desktop Java Runtime Environment (JRE), as follows:
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Lucida Bright Regular Lucida Bright Demibold Lucida Bright Demibold Italic Lucida Bright Italic
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Fonts
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JavaFX provides an additional cross-platform font called Amble Cn If you could only use physical fonts, it would be difficult to write an application that is guaranteed to work properly on all platforms because, beyond the limited set listed above, you would never know for sure which fonts you could rely on For this reason, JavaFX (like Java) also supports logical fontsThere are five logical fonts, which are always available on desktop systems:
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As you ll see in the next section, from a programming point of view, physical and logical fonts are indistinguishable you can use logical font names just as if they were the names of physical fonts In fact, a logical font is simply an alias for a physical fontThe mapping between a logical font and its corresponding physical font is both platform- and locale-dependent; that is, the fonts depend on the user s natural language For example, for an English-speaking user on the Windows platform, the mappings shown in Table 16-15 are defined, among others: Therefore, if your JavaFX application requests a Serif font on the Windows platform, it is most likely going to wind up using the physical Times New Roman font
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Table 16-15 Logical Font Mappings on the Windows Platform Physical Font
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Times New Roman Arial Courier New Arial Courier New
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Logical Font Name
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The Font Class
An instance of the Font class represents a logical or physical font that has the characteristics defined by its variables Font is an immutable class, so you can safely use a single instance to represent the same font anywhere within your applicationAlternatively, it is
16 Shapes, Text, and Images
possible (and usually simpler) to create multiple Font instances that amount to the same fontThe Font class has several class functions that let you list the available fonts and search for a font that has given characteristics The variables of the Font class are listed in Table 16-16 Note that most of these variables are only present in the desktop profile