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| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2012-01-26 23:32:43 -0600 |
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| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2012-01-26 23:32:43 -0600 |
| commit | ea318d1431c89e647598c510c4245c6571aa5f46 (patch) | |
| tree | 996d29b80c30d453dda86d1a23162d441628f169 /doc/html/ntqfontmetrics.html | |
| parent | aaf89d4b48f69c9293feb187db26362e550b5561 (diff) | |
| download | tqt3-ea318d1431c89e647598c510c4245c6571aa5f46.tar.gz tqt3-ea318d1431c89e647598c510c4245c6571aa5f46.zip | |
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diff --git a/doc/html/ntqfontmetrics.html b/doc/html/ntqfontmetrics.html new file mode 100644 index 000000000..ebe49b115 --- /dev/null +++ b/doc/html/ntqfontmetrics.html @@ -0,0 +1,419 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qfont.cpp:1807 --> +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> +<title>TQFontMetrics Class</title> +<style type="text/css"><!-- +fn { margin-left: 1cm; text-indent: -1cm; } +a:link { color: #004faf; text-decoration: none } +a:visited { color: #672967; text-decoration: none } +body { background: #ffffff; color: black; } +--></style> +</head> +<body> + +<table border="0" cellpadding="0" cellspacing="0" width="100%"> +<tr bgcolor="#E5E5E5"> +<td valign=center> + <a href="index.html"> +<font color="#004faf">Home</font></a> + | <a href="classes.html"> +<font color="#004faf">All Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped Classes</font></a> + | <a href="functions.html"> +<font color="#004faf">Functions</font></a> +</td> +<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> + +<p>The TQFontMetrics class provides font metrics information. +<a href="#details">More...</a> +<p><tt>#include <<a href="qfontmetrics-h.html">ntqfontmetrics.h</a>></tt> +<p><a href="qfontmetrics-members.html">List of all member functions.</a> +<h2>Public Members</h2> +<ul> +<li class=fn><a href="#TQFontMetrics"><b>TQFontMetrics</b></a> ( const TQFont & font )</li> +<li class=fn><a href="#TQFontMetrics-2"><b>TQFontMetrics</b></a> ( const TQFont & font, TQFont::Script script )</li> +<li class=fn><a href="#TQFontMetrics-3"><b>TQFontMetrics</b></a> ( const TQFontMetrics & fm )</li> +<li class=fn><a href="#~TQFontMetrics"><b>~TQFontMetrics</b></a> ()</li> +<li class=fn>TQFontMetrics & <a href="#operator-eq"><b>operator=</b></a> ( const TQFontMetrics & fm )</li> +<li class=fn>int <a href="#ascent"><b>ascent</b></a> () const</li> +<li class=fn>int <a href="#descent"><b>descent</b></a> () const</li> +<li class=fn>int <a href="#height"><b>height</b></a> () const</li> +<li class=fn>int <a href="#leading"><b>leading</b></a> () const</li> +<li class=fn>int <a href="#lineSpacing"><b>lineSpacing</b></a> () const</li> +<li class=fn>int <a href="#minLeftBearing"><b>minLeftBearing</b></a> () const</li> +<li class=fn>int <a href="#minRightBearing"><b>minRightBearing</b></a> () const</li> +<li class=fn>int <a href="#maxWidth"><b>maxWidth</b></a> () const</li> +<li class=fn>bool <a href="#inFont"><b>inFont</b></a> ( TQChar ch ) const</li> +<li class=fn>int <a href="#leftBearing"><b>leftBearing</b></a> ( TQChar ch ) const</li> +<li class=fn>int <a href="#rightBearing"><b>rightBearing</b></a> ( TQChar ch ) const</li> +<li class=fn>int <a href="#width-2"><b>width</b></a> ( const TQString & str, int len = -1 ) const</li> +<li class=fn>int <a href="#width"><b>width</b></a> ( TQChar ch ) const</li> +<li class=fn>int width ( char c ) const <em>(obsolete)</em></li> +<li class=fn>int <a href="#charWidth"><b>charWidth</b></a> ( const TQString & str, int pos ) const</li> +<li class=fn>TQRect <a href="#boundingRect-2"><b>boundingRect</b></a> ( const TQString & str, int len = -1 ) const</li> +<li class=fn>TQRect <a href="#boundingRect"><b>boundingRect</b></a> ( TQChar ch ) const</li> +<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> +<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> +<li class=fn>int <a href="#underlinePos"><b>underlinePos</b></a> () const</li> +<li class=fn>int <a href="#overlinePos"><b>overlinePos</b></a> () const</li> +<li class=fn>int <a href="#strikeOutPos"><b>strikeOutPos</b></a> () const</li> +<li class=fn>int <a href="#lineWidth"><b>lineWidth</b></a> () const</li> +</ul> +<hr><a name="details"></a><h2>Detailed Description</h2> + + +The TQFontMetrics class provides font metrics information. +<p> + +<p> TQFontMetrics functions calculate the size of characters and +strings for a given font. There are three ways you can create a +TQFontMetrics object: +<p> <ol type=1> +<li> Calling the TQFontMetrics constructor with a <a href="ntqfont.html">TQFont</a> creates a +font metrics object for a screen-compatible font, i.e. the font +cannot be a printer font<sup>*</sup>. If the font is changed +later, the font metrics object is <em>not</em> updated. +<p> <li> <a href="ntqwidget.html#fontMetrics">TQWidget::fontMetrics</a>() returns the font metrics for a widget's +font. This is equivalent to TQFontMetrics(widget->font()). If the +widget's font is changed later, the font metrics object is <em>not</em> +updated. +<p> <li> <a href="ntqpainter.html#fontMetrics">TQPainter::fontMetrics</a>() returns the font metrics for a +painter's current font. If the painter's font is changed later, the +font metrics object is <em>not</em> updated. +</ol> +<p> <sup>*</sup> If you use a printer font the values returned may be +inaccurate. Printer fonts are not always accessible so the nearest +screen font is used if a printer font is supplied. +<p> Once created, the object provides functions to access the +individual metrics of the font, its characters, and for strings +rendered in the font. +<p> There are several functions that operate on the font: <a href="#ascent">ascent</a>(), +<a href="#descent">descent</a>(), <a href="#height">height</a>(), <a href="#leading">leading</a>() and <a href="#lineSpacing">lineSpacing</a>() return the basic +size properties of the font. The <a href="#underlinePos">underlinePos</a>(), <a href="#overlinePos">overlinePos</a>(), +<a href="#strikeOutPos">strikeOutPos</a>() and <a href="#lineWidth">lineWidth</a>() functions, return the properties of +the line that underlines, overlines or strikes out the +characters. These functions are all fast. +<p> There are also some functions that operate on the set of glyphs in +the font: <a href="#minLeftBearing">minLeftBearing</a>(), <a href="#minRightBearing">minRightBearing</a>() and <a href="#maxWidth">maxWidth</a>(). +These are by necessity slow, and we recommend avoiding them if +possible. +<p> For each character, you can get its <a href="#width">width</a>(), <a href="#leftBearing">leftBearing</a>() and +<a href="#rightBearing">rightBearing</a>() and find out whether it is in the font using +<a href="#inFont">inFont</a>(). You can also treat the character as a string, and use +the string functions on it. +<p> The string functions include width(), to return the width of a +string in pixels (or points, for a printer), <a href="#boundingRect">boundingRect</a>(), to +return a rectangle large enough to contain the rendered string, +and <a href="#size">size</a>(), to return the size of that rectangle. +<p> Example: +<pre> + <a href="ntqfont.html">TQFont</a> font( "times", 24 ); + TQFontMetrics fm( font ); + int pixelsWide = fm.<a href="#width">width</a>( "What's the width of this text?" ); + int pixelsHigh = fm.<a href="#height">height</a>(); + </pre> + +<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>. + +<hr><h2>Member Function Documentation</h2> +<h3 class=fn><a name="TQFontMetrics"></a>TQFontMetrics::TQFontMetrics ( const <a href="ntqfont.html">TQFont</a> & font ) +</h3> +Constructs a font metrics object for <em>font</em>. +<p> The font must be screen-compatible, i.e. a font you use when +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>. +<p> The font metrics object holds the information for the font that is +passed in the constructor at the time it is created, and is not +updated if the font's attributes are changed later. +<p> Use <a href="ntqpainter.html#fontMetrics">TQPainter::fontMetrics</a>() to get the font metrics when painting. +This will give correct results also when painting on paint device +that is not screen-compatible. + +<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 ) +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Constructs a font metrics object for <em>font</em> using the given <em>script</em>. + +<h3 class=fn><a name="TQFontMetrics-3"></a>TQFontMetrics::TQFontMetrics ( const <a href="ntqfontmetrics.html">TQFontMetrics</a> & fm ) +</h3> +Constructs a copy of <em>fm</em>. + +<h3 class=fn><a name="~TQFontMetrics"></a>TQFontMetrics::~TQFontMetrics () +</h3> +Destroys the font metrics object and frees all allocated +resources. + +<h3 class=fn>int <a name="ascent"></a>TQFontMetrics::ascent () const +</h3> +Returns the ascent of the font. +<p> The ascent of a font is the distance from the baseline to the +highest position characters extend to. In practice, some font +designers break this rule, e.g. when they put more than one accent +on top of a character, or 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="#descent">descent</a>(). + +<p>Examples: <a href="drawdemo-example.html#x1064">drawdemo/drawdemo.cpp</a> and <a href="scrollview-example.html#x619">scrollview/scrollview.cpp</a>. +<h3 class=fn><a href="ntqrect.html">TQRect</a> <a name="boundingRect"></a>TQFontMetrics::boundingRect ( <a href="qchar.html">TQChar</a> ch ) const +</h3> +Returns the rectangle that is covered by ink if the character +specified by <em>ch</em> were to be drawn at the origin of the coordinate +system. +<p> Note that the bounding rectangle may extend to the left of (0, 0), +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 +will usually be empty. +<p> Note that the rectangle usually extends both above and below the +base line. +<p> <b>Warning:</b> The width of the returned rectangle is not the advance width +of the character. Use <a href="#boundingRect">boundingRect</a>(const <a href="ntqstring.html">TQString</a> &) or <a href="#width">width</a>() instead. +<p> <p>See also <a href="#width">width</a>(). + +<p>Example: <a href="xform-example.html#x1225">xform/xform.cpp</a>. +<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 +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Returns the bounding rectangle that contains the first <em>len</em> +characters of string <em>str</em>. + +<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 +</h3> +This is an overloaded member function, provided for convenience. It behaves essentially like the above function. +<p> Returns the bounding rectangle of the first <em>len</em> characters of +<em>str</em>, which is the set of pixels the text would cover if drawn +at (0, 0). The drawing, and hence the bounding rectangle, is +constrained to the rectangle (<em>x</em>, <em>y</em>, <em>w</em>, <em>h</em>). +<p> If <em>len</em> is negative (which is the default), the entire string is +used. +<p> The <em>flgs</em> argument is the bitwise OR of the following flags: +<ul> +<li> <tt>AlignAuto</tt> aligns to the left border for all languages except +Arabic and Hebrew where it aligns to the right. +<li> <tt>AlignLeft</tt> aligns to the left border. +<li> <tt>AlignRight</tt> aligns to the right border. +<li> <tt>AlignJustify</tt> produces justified text. +<li> <tt>AlignHCenter</tt> aligns horizontally centered. +<li> <tt>AlignTop</tt> aligns to the top border. +<li> <tt>AlignBottom</tt> aligns to the bottom border. +<li> <tt>AlignVCenter</tt> aligns vertically centered +<li> <tt>AlignCenter</tt> (== <tt>AlignHCenter | AlignVCenter</tt>) +<li> <tt>SingleLine</tt> ignores newline characters in the text. +<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> +<p> Horizontal alignment defaults to <tt>AlignAuto</tt> and vertical +alignment defaults to <tt>AlignTop</tt>. +<p> If several of the horizontal or several of the vertical alignment +flags are set, the resulting alignment is undefined. +<p> These flags are defined in <a href="qnamespace-h.html">ntqnamespace.h</a>. +<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> Note that the bounding rectangle may extend to the left of (0, 0), +e.g. for italicized fonts, and that the text output may cover <em>all</em> pixels in the bounding rectangle. +<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 bounding rectangle given by this function is somewhat larger +than that calculated by the simpler <a href="#boundingRect">boundingRect</a>() function. This +function uses the <a href="#minLeftBearing">maximum left</a> and +<a href="#minRightBearing">right</a> font bearings as is +necessary for multi-line text to align correctly. Also, +fontHeight() and <a href="#lineSpacing">lineSpacing</a>() are used to calculate the height, +rather than individual character heights. +<p> The <em>intern</em> argument should not be used. +<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>. + +<h3 class=fn>int <a name="charWidth"></a>TQFontMetrics::charWidth ( const <a href="ntqstring.html">TQString</a> & str, int pos ) const +</h3> +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>. +<h3 class=fn><a href="ntqfontmetrics.html">TQFontMetrics</a> & <a name="operator-eq"></a>TQFontMetrics::operator= ( const <a href="ntqfontmetrics.html">TQFontMetrics</a> & fm ) +</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>. +<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 +</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> +<p> These flags are defined in <a href="qnamespace-h.html">ntqnamespace.h</a>. +<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>. +<h3 class=fn>int <a name="width-2"></a>TQFontMetrics::width ( const <a href="ntqstring.html">TQString</a> & str, int len = -1 ) const +</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> |