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420 lines
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420 lines
25 KiB
13 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qfont.cpp:1807 -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>TQFontMetrics Class</title>
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<font color="#004faf">Home</font></a>
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Functions</font></a>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQFontMetrics Class Reference</h1>
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<p>The TQFontMetrics class provides font metrics information.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qfontmetrics-h.html">ntqfontmetrics.h</a>></tt>
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<p><a href="qfontmetrics-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn><a href="#TQFontMetrics"><b>TQFontMetrics</b></a> ( const TQFont & font )</li>
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<li class=fn><a href="#TQFontMetrics-2"><b>TQFontMetrics</b></a> ( const TQFont & font, TQFont::Script script )</li>
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<li class=fn><a href="#TQFontMetrics-3"><b>TQFontMetrics</b></a> ( const TQFontMetrics & fm )</li>
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<li class=fn><a href="#~TQFontMetrics"><b>~TQFontMetrics</b></a> ()</li>
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<li class=fn>TQFontMetrics & <a href="#operator-eq"><b>operator=</b></a> ( const TQFontMetrics & fm )</li>
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<li class=fn>int <a href="#ascent"><b>ascent</b></a> () const</li>
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<li class=fn>int <a href="#descent"><b>descent</b></a> () const</li>
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<li class=fn>int <a href="#height"><b>height</b></a> () const</li>
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<li class=fn>int <a href="#leading"><b>leading</b></a> () const</li>
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<li class=fn>int <a href="#lineSpacing"><b>lineSpacing</b></a> () const</li>
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<li class=fn>int <a href="#minLeftBearing"><b>minLeftBearing</b></a> () const</li>
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<li class=fn>int <a href="#minRightBearing"><b>minRightBearing</b></a> () const</li>
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<li class=fn>int <a href="#maxWidth"><b>maxWidth</b></a> () const</li>
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<li class=fn>bool <a href="#inFont"><b>inFont</b></a> ( TQChar ch ) const</li>
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<li class=fn>int <a href="#leftBearing"><b>leftBearing</b></a> ( TQChar ch ) const</li>
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<li class=fn>int <a href="#rightBearing"><b>rightBearing</b></a> ( TQChar ch ) const</li>
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<li class=fn>int <a href="#width-2"><b>width</b></a> ( const TQString & str, int len = -1 ) const</li>
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<li class=fn>int <a href="#width"><b>width</b></a> ( TQChar ch ) const</li>
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<li class=fn>int width ( char c ) const <em>(obsolete)</em></li>
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<li class=fn>int <a href="#charWidth"><b>charWidth</b></a> ( const TQString & str, int pos ) const</li>
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<li class=fn>TQRect <a href="#boundingRect-2"><b>boundingRect</b></a> ( const TQString & str, int len = -1 ) const</li>
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<li class=fn>TQRect <a href="#boundingRect"><b>boundingRect</b></a> ( TQChar ch ) const</li>
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<li class=fn>TQRect <a href="#boundingRect-3"><b>boundingRect</b></a> ( int x, int y, int w, int h, int flgs, const TQString & str, int len = -1, int tabstops = 0, int * tabarray = 0, TQTextParag ** intern = 0 ) const</li>
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<li class=fn>TQSize <a href="#size"><b>size</b></a> ( int flgs, const TQString & str, int len = -1, int tabstops = 0, int * tabarray = 0, TQTextParag ** intern = 0 ) const</li>
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<li class=fn>int <a href="#underlinePos"><b>underlinePos</b></a> () const</li>
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<li class=fn>int <a href="#overlinePos"><b>overlinePos</b></a> () const</li>
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<li class=fn>int <a href="#strikeOutPos"><b>strikeOutPos</b></a> () const</li>
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<li class=fn>int <a href="#lineWidth"><b>lineWidth</b></a> () const</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQFontMetrics class provides font metrics information.
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<p>
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<p> TQFontMetrics functions calculate the size of characters and
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strings for a given font. There are three ways you can create a
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TQFontMetrics object:
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<p> <ol type=1>
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<li> Calling the TQFontMetrics constructor with a <a href="ntqfont.html">TQFont</a> creates a
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font metrics object for a screen-compatible font, i.e. the font
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cannot be a printer font<sup>*</sup>. If the font is changed
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later, the font metrics object is <em>not</em> updated.
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<p> <li> <a href="ntqwidget.html#fontMetrics">TQWidget::fontMetrics</a>() returns the font metrics for a widget's
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font. This is equivalent to TQFontMetrics(widget->font()). If the
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widget's font is changed later, the font metrics object is <em>not</em>
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updated.
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<p> <li> <a href="ntqpainter.html#fontMetrics">TQPainter::fontMetrics</a>() returns the font metrics for a
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painter's current font. If the painter's font is changed later, the
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font metrics object is <em>not</em> updated.
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</ol>
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<p> <sup>*</sup> If you use a printer font the values returned may be
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inaccurate. Printer fonts are not always accessible so the nearest
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screen font is used if a printer font is supplied.
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<p> Once created, the object provides functions to access the
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individual metrics of the font, its characters, and for strings
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rendered in the font.
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<p> There are several functions that operate on the font: <a href="#ascent">ascent</a>(),
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<a href="#descent">descent</a>(), <a href="#height">height</a>(), <a href="#leading">leading</a>() and <a href="#lineSpacing">lineSpacing</a>() return the basic
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size properties of the font. The <a href="#underlinePos">underlinePos</a>(), <a href="#overlinePos">overlinePos</a>(),
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<a href="#strikeOutPos">strikeOutPos</a>() and <a href="#lineWidth">lineWidth</a>() functions, return the properties of
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the line that underlines, overlines or strikes out the
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characters. These functions are all fast.
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<p> There are also some functions that operate on the set of glyphs in
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the font: <a href="#minLeftBearing">minLeftBearing</a>(), <a href="#minRightBearing">minRightBearing</a>() and <a href="#maxWidth">maxWidth</a>().
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These are by necessity slow, and we recommend avoiding them if
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possible.
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<p> For each character, you can get its <a href="#width">width</a>(), <a href="#leftBearing">leftBearing</a>() and
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<a href="#rightBearing">rightBearing</a>() and find out whether it is in the font using
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<a href="#inFont">inFont</a>(). You can also treat the character as a string, and use
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the string functions on it.
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<p> The string functions include width(), to return the width of a
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string in pixels (or points, for a printer), <a href="#boundingRect">boundingRect</a>(), to
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return a rectangle large enough to contain the rendered string,
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and <a href="#size">size</a>(), to return the size of that rectangle.
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<p> Example:
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<pre>
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<a href="ntqfont.html">TQFont</a> font( "times", 24 );
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TQFontMetrics fm( font );
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int pixelsWide = fm.<a href="#width">width</a>( "What's the width of this text?" );
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int pixelsHigh = fm.<a href="#height">height</a>();
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</pre>
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<p> <p>See also <a href="ntqfont.html">TQFont</a>, <a href="ntqfontinfo.html">TQFontInfo</a>, <a href="ntqfontdatabase.html">TQFontDatabase</a>, <a href="graphics.html">Graphics Classes</a>, and <a href="shared.html">Implicitly and Explicitly Shared Classes</a>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQFontMetrics"></a>TQFontMetrics::TQFontMetrics ( const <a href="ntqfont.html">TQFont</a> & font )
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</h3>
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Constructs a font metrics object for <em>font</em>.
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<p> The font must be screen-compatible, i.e. a font you use when
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drawing text in <a href="ntqwidget.html">widgets</a> or <a href="ntqpixmap.html">pixmaps</a>, not <a href="ntqpicture.html">TQPicture</a> or <a href="ntqprinter.html">TQPrinter</a>.
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<p> The font metrics object holds the information for the font that is
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passed in the constructor at the time it is created, and is not
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updated if the font's attributes are changed later.
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<p> Use <a href="ntqpainter.html#fontMetrics">TQPainter::fontMetrics</a>() to get the font metrics when painting.
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This will give correct results also when painting on paint device
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that is not screen-compatible.
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<h3 class=fn><a name="TQFontMetrics-2"></a>TQFontMetrics::TQFontMetrics ( const <a href="ntqfont.html">TQFont</a> & font, <a href="ntqfont.html#Script-enum">TQFont::Script</a> script )
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Constructs a font metrics object for <em>font</em> using the given <em>script</em>.
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<h3 class=fn><a name="TQFontMetrics-3"></a>TQFontMetrics::TQFontMetrics ( const <a href="ntqfontmetrics.html">TQFontMetrics</a> & fm )
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</h3>
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Constructs a copy of <em>fm</em>.
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<h3 class=fn><a name="~TQFontMetrics"></a>TQFontMetrics::~TQFontMetrics ()
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</h3>
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Destroys the font metrics object and frees all allocated
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resources.
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<h3 class=fn>int <a name="ascent"></a>TQFontMetrics::ascent () const
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</h3>
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Returns the ascent of the font.
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<p> The ascent of a font is the distance from the baseline to the
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highest position characters extend to. In practice, some font
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designers break this rule, e.g. when they put more than one accent
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on top of a character, or to accommodate an unusual character in
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an exotic language, so it is possible (though rare) that this
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value will be too small.
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<p> <p>See also <a href="#descent">descent</a>().
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<p>Examples: <a href="drawdemo-example.html#x1064">drawdemo/drawdemo.cpp</a> and <a href="scrollview-example.html#x619">scrollview/scrollview.cpp</a>.
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<h3 class=fn><a href="ntqrect.html">TQRect</a> <a name="boundingRect"></a>TQFontMetrics::boundingRect ( <a href="qchar.html">TQChar</a> ch ) const
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</h3>
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Returns the rectangle that is covered by ink if the character
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specified by <em>ch</em> were to be drawn at the origin of the coordinate
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system.
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<p> Note that the bounding rectangle may extend to the left of (0, 0),
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e.g. for italicized fonts, and that the text output may cover <em>all</em> pixels in the bounding rectangle. For a space character the rectangle
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will usually be empty.
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<p> Note that the rectangle usually extends both above and below the
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base line.
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<p> <b>Warning:</b> The width of the returned rectangle is not the advance width
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of the character. Use <a href="#boundingRect">boundingRect</a>(const <a href="ntqstring.html">TQString</a> &) or <a href="#width">width</a>() instead.
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<p> <p>See also <a href="#width">width</a>().
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<p>Example: <a href="xform-example.html#x1225">xform/xform.cpp</a>.
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<h3 class=fn><a href="ntqrect.html">TQRect</a> <a name="boundingRect-2"></a>TQFontMetrics::boundingRect ( const <a href="ntqstring.html">TQString</a> & str, int len = -1 ) const
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Returns the bounding rectangle that contains the first <em>len</em>
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characters of string <em>str</em>.
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<h3 class=fn><a href="ntqrect.html">TQRect</a> <a name="boundingRect-3"></a>TQFontMetrics::boundingRect ( int x, int y, int w, int h, int flgs, const <a href="ntqstring.html">TQString</a> & str, int len = -1, int tabstops = 0, int * tabarray = 0, TQTextParag ** intern = 0 ) const
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</h3>
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This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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<p> Returns the bounding rectangle of the first <em>len</em> characters of
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<em>str</em>, which is the set of pixels the text would cover if drawn
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at (0, 0). The drawing, and hence the bounding rectangle, is
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constrained to the rectangle (<em>x</em>, <em>y</em>, <em>w</em>, <em>h</em>).
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<p> If <em>len</em> is negative (which is the default), the entire string is
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used.
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<p> The <em>flgs</em> argument is the bitwise OR of the following flags:
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<ul>
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<li> <tt>AlignAuto</tt> aligns to the left border for all languages except
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Arabic and Hebrew where it aligns to the right.
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<li> <tt>AlignLeft</tt> aligns to the left border.
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<li> <tt>AlignRight</tt> aligns to the right border.
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<li> <tt>AlignJustify</tt> produces justified text.
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<li> <tt>AlignHCenter</tt> aligns horizontally centered.
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<li> <tt>AlignTop</tt> aligns to the top border.
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<li> <tt>AlignBottom</tt> aligns to the bottom border.
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<li> <tt>AlignVCenter</tt> aligns vertically centered
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<li> <tt>AlignCenter</tt> (== <tt>AlignHCenter | AlignVCenter</tt>)
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<li> <tt>SingleLine</tt> ignores newline characters in the text.
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<li> <tt>ExpandTabs</tt> expands tabs (see below)
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<li> <tt>ShowPrefix</tt> interprets "&x" as "<u>x</u>", i.e. underlined.
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<li> <tt>WordBreak</tt> breaks the text to fit the rectangle.
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</ul>
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<p> Horizontal alignment defaults to <tt>AlignAuto</tt> and vertical
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alignment defaults to <tt>AlignTop</tt>.
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<p> If several of the horizontal or several of the vertical alignment
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flags are set, the resulting alignment is undefined.
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<p> These flags are defined in <a href="qnamespace-h.html">ntqnamespace.h</a>.
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<p> If <tt>ExpandTabs</tt> is set in <em>flgs</em>, then: if <em>tabarray</em> is
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non-null, it specifies a 0-terminated sequence of pixel-positions
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for tabs; otherwise if <em>tabstops</em> is non-zero, it is used as the
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tab spacing (in pixels).
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<p> Note that the bounding rectangle may extend to the left of (0, 0),
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e.g. for italicized fonts, and that the text output may cover <em>all</em> pixels in the bounding rectangle.
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<p> Newline characters are processed as linebreaks.
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<p> Despite the different actual character heights, the heights of the
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bounding rectangles of "Yes" and "yes" are the same.
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<p> The bounding rectangle given by this function is somewhat larger
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than that calculated by the simpler <a href="#boundingRect">boundingRect</a>() function. This
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function uses the <a href="#minLeftBearing">maximum left</a> and
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<a href="#minRightBearing">right</a> font bearings as is
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necessary for multi-line text to align correctly. Also,
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fontHeight() and <a href="#lineSpacing">lineSpacing</a>() are used to calculate the height,
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rather than individual character heights.
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<p> The <em>intern</em> argument should not be used.
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<p> <p>See also <a href="#width">width</a>(), <a href="ntqpainter.html#boundingRect">TQPainter::boundingRect</a>(), and <a href="ntqt.html#AlignmentFlags-enum">TQt::AlignmentFlags</a>.
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<h3 class=fn>int <a name="charWidth"></a>TQFontMetrics::charWidth ( const <a href="ntqstring.html">TQString</a> & str, int pos ) const
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</h3>
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Returns the width of the character at position <em>pos</em> in the
|
||
|
|
string <em>str</em>.
|
||
|
|
<p> The whole string is needed, as the glyph drawn may change
|
||
|
|
depending on the context (the letter before and after the current
|
||
|
|
one) for some languages (e.g. Arabic).
|
||
|
|
<p> This function also takes non spacing marks and ligatures into
|
||
|
|
account.
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="descent"></a>TQFontMetrics::descent () const
|
||
|
|
</h3>
|
||
|
|
Returns the descent of the font.
|
||
|
|
<p> The descent is the distance from the base line to the lowest point
|
||
|
|
characters extend to. (Note that this is different from X, which
|
||
|
|
adds 1 pixel.) In practice, some font designers break this rule,
|
||
|
|
e.g. to accommodate an unusual character in an exotic language, so
|
||
|
|
it is possible (though rare) that this value will be too small.
|
||
|
|
<p> <p>See also <a href="#ascent">ascent</a>().
|
||
|
|
|
||
|
|
<p>Examples: <a href="drawdemo-example.html#x1065">drawdemo/drawdemo.cpp</a> and <a href="hello-example.html#x1629">hello/hello.cpp</a>.
|
||
|
|
<h3 class=fn>int <a name="height"></a>TQFontMetrics::height () const
|
||
|
|
</h3>
|
||
|
|
Returns the height of the font.
|
||
|
|
<p> This is always equal to <a href="#ascent">ascent</a>()+descent()+1 (the 1 is for the
|
||
|
|
base line).
|
||
|
|
<p> <p>See also <a href="#leading">leading</a>() and <a href="#lineSpacing">lineSpacing</a>().
|
||
|
|
|
||
|
|
<p>Examples: <a href="grapher-nsplugin-example.html#x2741">grapher/grapher.cpp</a>, <a href="hello-example.html#x1630">hello/hello.cpp</a>, and <a href="qfd-example.html#x1986">qfd/fontdisplayer.cpp</a>.
|
||
|
|
<h3 class=fn>bool <a name="inFont"></a>TQFontMetrics::inFont ( <a href="qchar.html">TQChar</a> ch ) const
|
||
|
|
</h3>
|
||
|
|
Returns TRUE if character <em>ch</em> is a valid character in the font;
|
||
|
|
otherwise returns FALSE.
|
||
|
|
|
||
|
|
<p>Example: <a href="qfd-example.html#x1987">qfd/fontdisplayer.cpp</a>.
|
||
|
|
<h3 class=fn>int <a name="leading"></a>TQFontMetrics::leading () const
|
||
|
|
</h3>
|
||
|
|
Returns the leading of the font.
|
||
|
|
<p> This is the natural inter-line spacing.
|
||
|
|
<p> <p>See also <a href="#height">height</a>() and <a href="#lineSpacing">lineSpacing</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="leftBearing"></a>TQFontMetrics::leftBearing ( <a href="qchar.html">TQChar</a> ch ) const
|
||
|
|
</h3>
|
||
|
|
Returns the left bearing of character <em>ch</em> in the font.
|
||
|
|
<p> The left bearing is the right-ward distance of the left-most pixel
|
||
|
|
of the character from the logical origin of the character. This
|
||
|
|
value is negative if the pixels of the character extend to the
|
||
|
|
left of the logical origin.
|
||
|
|
<p> See <a href="#width">width</a>(<a href="qchar.html">TQChar</a>) for a graphical description of this metric.
|
||
|
|
<p> <p>See also <a href="#rightBearing">rightBearing</a>(), <a href="#minLeftBearing">minLeftBearing</a>(), and <a href="#width">width</a>().
|
||
|
|
|
||
|
|
<p>Example: <a href="qfd-example.html#x1988">qfd/fontdisplayer.cpp</a>.
|
||
|
|
<h3 class=fn>int <a name="lineSpacing"></a>TQFontMetrics::lineSpacing () const
|
||
|
|
</h3>
|
||
|
|
Returns the distance from one base line to the next.
|
||
|
|
<p> This value is always equal to <a href="#leading">leading</a>()+height().
|
||
|
|
<p> <p>See also <a href="#height">height</a>() and <a href="#leading">leading</a>().
|
||
|
|
|
||
|
|
<p>Examples: <a href="qfd-example.html#x1989">qfd/fontdisplayer.cpp</a>, <a href="qwerty-example.html#x369">qwerty/qwerty.cpp</a>, and <a href="scrollview-example.html#x620">scrollview/scrollview.cpp</a>.
|
||
|
|
<h3 class=fn>int <a name="lineWidth"></a>TQFontMetrics::lineWidth () const
|
||
|
|
</h3>
|
||
|
|
Returns the width of the underline and strikeout lines, adjusted
|
||
|
|
for the point size of the font.
|
||
|
|
<p> <p>See also <a href="#underlinePos">underlinePos</a>(), <a href="#overlinePos">overlinePos</a>(), and <a href="#strikeOutPos">strikeOutPos</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="maxWidth"></a>TQFontMetrics::maxWidth () const
|
||
|
|
</h3>
|
||
|
|
Returns the width of the widest character in the font.
|
||
|
|
|
||
|
|
<p>Example: <a href="qfd-example.html#x1990">qfd/fontdisplayer.cpp</a>.
|
||
|
|
<h3 class=fn>int <a name="minLeftBearing"></a>TQFontMetrics::minLeftBearing () const
|
||
|
|
</h3>
|
||
|
|
Returns the minimum left bearing of the font.
|
||
|
|
<p> This is the smallest <a href="#leftBearing">leftBearing</a>(char) of all characters in the
|
||
|
|
font.
|
||
|
|
<p> Note that this function can be very slow if the font is large.
|
||
|
|
<p> <p>See also <a href="#minRightBearing">minRightBearing</a>() and <a href="#leftBearing">leftBearing</a>().
|
||
|
|
|
||
|
|
<p>Example: <a href="qfd-example.html#x1991">qfd/fontdisplayer.cpp</a>.
|
||
|
|
<h3 class=fn>int <a name="minRightBearing"></a>TQFontMetrics::minRightBearing () const
|
||
|
|
</h3>
|
||
|
|
Returns the minimum right bearing of the font.
|
||
|
|
<p> This is the smallest <a href="#rightBearing">rightBearing</a>(char) of all characters in the
|
||
|
|
font.
|
||
|
|
<p> Note that this function can be very slow if the font is large.
|
||
|
|
<p> <p>See also <a href="#minLeftBearing">minLeftBearing</a>() and <a href="#rightBearing">rightBearing</a>().
|
||
|
|
|
||
|
|
<p>Example: <a href="qfd-example.html#x1992">qfd/fontdisplayer.cpp</a>.
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqfontmetrics.html">TQFontMetrics</a> & <a name="operator-eq"></a>TQFontMetrics::operator= ( const <a href="ntqfontmetrics.html">TQFontMetrics</a> & fm )
|
||
|
13 years ago
|
</h3>
|
||
|
|
Assigns the font metrics <em>fm</em>.
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="overlinePos"></a>TQFontMetrics::overlinePos () const
|
||
|
|
</h3>
|
||
|
|
Returns the distance from the base line to where an overline
|
||
|
|
should be drawn.
|
||
|
|
<p> <p>See also <a href="#underlinePos">underlinePos</a>(), <a href="#strikeOutPos">strikeOutPos</a>(), and <a href="#lineWidth">lineWidth</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="rightBearing"></a>TQFontMetrics::rightBearing ( <a href="qchar.html">TQChar</a> ch ) const
|
||
|
|
</h3>
|
||
|
|
Returns the right bearing of character <em>ch</em> in the font.
|
||
|
|
<p> The right bearing is the left-ward distance of the right-most
|
||
|
|
pixel of the character from the logical origin of a subsequent
|
||
|
|
character. This value is negative if the pixels of the character
|
||
|
|
extend to the right of the <a href="#width">width</a>() of the character.
|
||
|
|
<p> See width() for a graphical description of this metric.
|
||
|
|
<p> <p>See also <a href="#leftBearing">leftBearing</a>(), <a href="#minRightBearing">minRightBearing</a>(), and <a href="#width">width</a>().
|
||
|
|
|
||
|
|
<p>Example: <a href="qfd-example.html#x1993">qfd/fontdisplayer.cpp</a>.
|
||
|
13 years ago
|
<h3 class=fn><a href="ntqsize.html">TQSize</a> <a name="size"></a>TQFontMetrics::size ( int flgs, const <a href="ntqstring.html">TQString</a> & str, int len = -1, int tabstops = 0, int * tabarray = 0, TQTextParag ** intern = 0 ) const
|
||
|
13 years ago
|
</h3>
|
||
|
|
Returns the size in pixels of the first <em>len</em> characters of <em>str</em>.
|
||
|
|
<p> If <em>len</em> is negative (the default), the entire string is used.
|
||
|
|
<p> The <em>flgs</em> argument is the bitwise OR of the following flags:
|
||
|
|
<ul>
|
||
|
|
<li> <tt>SingleLine</tt> ignores newline characters.
|
||
|
|
<li> <tt>ExpandTabs</tt> expands tabs (see below)
|
||
|
|
<li> <tt>ShowPrefix</tt> interprets "&x" as "<u>x</u>", i.e. underlined.
|
||
|
|
<li> <tt>WordBreak</tt> breaks the text to fit the rectangle.
|
||
|
|
</ul>
|
||
|
13 years ago
|
<p> These flags are defined in <a href="qnamespace-h.html">ntqnamespace.h</a>.
|
||
|
13 years ago
|
<p> If <tt>ExpandTabs</tt> is set in <em>flgs</em>, then: if <em>tabarray</em> is
|
||
|
|
non-null, it specifies a 0-terminated sequence of pixel-positions
|
||
|
|
for tabs; otherwise if <em>tabstops</em> is non-zero, it is used as the
|
||
|
|
tab spacing (in pixels).
|
||
|
|
<p> Newline characters are processed as linebreaks.
|
||
|
|
<p> Despite the different actual character heights, the heights of the
|
||
|
|
bounding rectangles of "Yes" and "yes" are the same.
|
||
|
|
<p> The <em>intern</em> argument should not be used.
|
||
|
|
<p> <p>See also <a href="#boundingRect">boundingRect</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="strikeOutPos"></a>TQFontMetrics::strikeOutPos () const
|
||
|
|
</h3>
|
||
|
|
Returns the distance from the base line to where the strikeout
|
||
|
|
line should be drawn.
|
||
|
|
<p> <p>See also <a href="#underlinePos">underlinePos</a>(), <a href="#overlinePos">overlinePos</a>(), and <a href="#lineWidth">lineWidth</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="underlinePos"></a>TQFontMetrics::underlinePos () const
|
||
|
|
</h3>
|
||
|
|
Returns the distance from the base line to where an underscore
|
||
|
|
should be drawn.
|
||
|
|
<p> <p>See also <a href="#overlinePos">overlinePos</a>(), <a href="#strikeOutPos">strikeOutPos</a>(), and <a href="#lineWidth">lineWidth</a>().
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="width"></a>TQFontMetrics::width ( <a href="qchar.html">TQChar</a> ch ) const
|
||
|
|
</h3>
|
||
|
|
<p> <img src="bearings.png" align=right>
|
||
|
|
<p> Returns the logical width of character <em>ch</em> in pixels. This is a
|
||
|
|
distance appropriate for drawing a subsequent character after <em>ch</em>.
|
||
|
|
<p> Some of the metrics are described in the image to the right. The
|
||
|
|
central dark rectangles cover the logical <a href="#width">width</a>() of each
|
||
|
|
character. The outer pale rectangles cover the <a href="#leftBearing">leftBearing</a>() and
|
||
|
|
<a href="#rightBearing">rightBearing</a>() of each character. Notice that the bearings of "f"
|
||
|
|
in this particular font are both negative, while the bearings of
|
||
|
|
"o" are both positive.
|
||
|
|
<p> <b>Warning:</b> This function will produce incorrect results for Arabic
|
||
|
|
characters or non spacing marks in the middle of a string, as the
|
||
|
|
glyph shaping and positioning of marks that happens when
|
||
|
|
processing strings cannot be taken into account. Use <a href="#charWidth">charWidth</a>()
|
||
|
|
instead if you aren't looking for the width of isolated
|
||
|
|
characters.
|
||
|
|
<p> <p>See also <a href="#boundingRect">boundingRect</a>() and <a href="#charWidth">charWidth</a>().
|
||
|
|
|
||
|
|
<p>Examples: <a href="drawdemo-example.html#x1066">drawdemo/drawdemo.cpp</a>, <a href="hello-example.html#x1631">hello/hello.cpp</a>, <a href="movies-example.html#x496">movies/main.cpp</a>, <a href="qfd-example.html#x1994">qfd/fontdisplayer.cpp</a>, and <a href="scrollview-example.html#x621">scrollview/scrollview.cpp</a>.
|
||
|
13 years ago
|
<h3 class=fn>int <a name="width-2"></a>TQFontMetrics::width ( const <a href="ntqstring.html">TQString</a> & str, int len = -1 ) const
|
||
|
13 years ago
|
</h3>
|
||
|
|
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> Returns the width of the first <em>len</em> characters of string <em>str</em>.
|
||
|
|
|
||
|
|
<h3 class=fn>int <a name="width-3"></a>TQFontMetrics::width ( char c ) const
|
||
|
|
</h3>
|
||
|
|
<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
||
|
|
<p> <b>This function is obsolete.</b> It is provided to keep old source working. We strongly advise against using it in new code.
|
||
|
|
<p> Provided to aid porting from TQt 1.x.
|
||
|
|
|
||
|
|
<!-- eof -->
|
||
|
|
<hr><p>
|
||
|
|
This file is part of the <a href="index.html">TQt toolkit</a>.
|
||
|
|
Copyright © 1995-2007
|
||
|
|
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
||
|
|
<table width=100% cellspacing=0 border=0><tr>
|
||
|
|
<td>Copyright © 2007
|
||
|
|
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
||
|
|
<td align=right><div align=right>TQt 3.3.8</div>
|
||
|
|
</table></div></address></body>
|
||
|
|
</html>
|