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<HTML><HEAD><TITLE>GtkRuler</TITLE><METANAME="GENERATOR"CONTENT="Modular DocBook HTML Stylesheet Version 1.61"><LINKREL="HOME"TITLE="GTK+ Reference Manual"HREF="index.html"><LINKREL="UP"TITLE="GTK+ Widgets and Objects"HREF="gtkobjects.html"><LINKREL="PREVIOUS"TITLE="GtkRange"HREF="gtkrange.html"><LINKREL="NEXT"TITLE="GtkScale"HREF="gtkscale.html"></HEAD><BODYCLASS="REFENTRY"BGCOLOR="#FFFFFF"TEXT="#000000"LINK="#0000FF"VLINK="#840084"ALINK="#0000FF"><DIVCLASS="NAVHEADER"><TABLEWIDTH="100%"BORDER="0"BGCOLOR="#000000"CELLPADDING="1"CELLSPACING="0"><TR><THCOLSPAN="4"ALIGN="center"><FONTCOLOR="#FFFFFF"SIZE="5">GTK+ Reference Manual</FONT></TH></TR><TR><TDWIDTH="25%"BGCOLOR="#C00000"ALIGN="left"><AHREF="gtkrange.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B><<< Previous Page</B></FONT></A></TD><TDWIDTH="25%"BGCOLOR="#0000C0"ALIGN="center"><FONTCOLOR="#FFFFFF"SIZE="3"><B><AHREF="index.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Home</B></FONT></A></B></FONT></TD><TDWIDTH="25%"BGCOLOR="#00C000"ALIGN="center"><FONTCOLOR="#FFFFFF"SIZE="3"><B><AHREF="gtkobjects.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Up</B></FONT></A></B></FONT></TD><TDWIDTH="25%"BGCOLOR="#C00000"ALIGN="right"><AHREF="gtkscale.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Next Page >>></B></FONT></A></TD></TR></TABLE></DIV><H1><ANAME="GTKRULER">GtkRuler</A></H1><DIVCLASS="REFNAMEDIV"><ANAME="AEN38318"></A><H2>Name</H2>GtkRuler -- Base class for horizontal or vertical rulers</DIV><DIVCLASS="REFSYNOPSISDIV"><ANAME="AEN38321"></A><H2>Synopsis</H2><TABLEBORDER="0"BGCOLOR="#D6E8FF"WIDTH="100%"CELLPADDING="6"><TR><TD><PRECLASS="SYNOPSIS"> #include <gtk/gtk.h>struct <AHREF="gtkruler.html#GTKRULER-STRUCT">GtkRuler</A>;struct <AHREF="gtkruler.html#GTKRULERMETRIC">GtkRulerMetric</A>;void <AHREF="gtkruler.html#GTK-RULER-SET-METRIC">gtk_ruler_set_metric</A> (<AHREF="gtkruler.html">GtkRuler</A> *ruler, <AHREF="gtk-standard-enumerations.html#GTKMETRICTYPE">GtkMetricType</A> metric);void <AHREF="gtkruler.html#GTK-RULER-SET-RANGE">gtk_ruler_set_range</A> (<AHREF="gtkruler.html">GtkRuler</A> *ruler, <AHREF=../glib/glib-basic-types.html#GFLOAT>gfloat</A> lower, <AHREF=../glib/glib-basic-types.html#GFLOAT>gfloat</A> upper, <AHREF=../glib/glib-basic-types.html#GFLOAT>gfloat</A> position, <AHREF=../glib/glib-basic-types.html#GFLOAT>gfloat</A> max_size); </PRE></TD></TR></TABLE></DIV><DIVCLASS="REFSECT1"><ANAME="AEN38335"></A><H2>Object Hierarchy</H2><TABLEBORDER="0"BGCOLOR="#D6E8FF"WIDTH="100%"CELLPADDING="6"><TR><TD><PRECLASS="SYNOPSIS"> <AHREF="gtkobject.html">GtkObject</A> +----<AHREF="gtkwidget.html">GtkWidget</A> +----GtkRuler</PRE></TD></TR></TABLE></DIV><DIVCLASS="REFSECT1"><ANAME="AEN38340"></A><H2>Description</H2><P>The GTKRuler widget is a base class for horizontal and vertical rulers. Rulersare used to show the mouse pointer's location in a window. The ruler can eitherbe horizontal or vertical on the window. Within the ruler a small triangleindicates the location of the mouse relative to the horixontal or verticalruler. See <AHREF="gtkhruler.html">GtkHRuler</A> to learn how to create a new horizontal ruler. See<AHREF="gtkvruler.html">GtkVRuler</A> to learn how to create a new vertical ruler.</P></DIV><DIVCLASS="REFSECT1"><ANAME="AEN38345"></A><H2>Details</H2><DIVCLASS="REFSECT2"><ANAME="AEN38347"></A><H3><ANAME="GTKRULER-STRUCT"></A>struct GtkRuler</H3><TABLEBORDER="0"BGCOLOR="#D6E8FF"WIDTH="100%"CELLPADDING="6"><TR><TD><PRECLASS="PROGRAMLISTING">struct GtkRuler;</PRE></TD></TR></TABLE><P>All distances are in 1/72nd's of an inch. (According to Adobe thats a point, butpoints are really 1/72.27 in.)</P></DIV><HR><DIVCLASS="REFSECT2"><ANAME="AEN38352"></A><H3><ANAME="GTKRULERMETRIC"></A>struct GtkRulerMetric</H3><TABLEBORDER="0"BGCOLOR="#D6E8FF"WIDTH="100%"CELLPADDING="6"><TR><TD><PRECLASS="PROGRAMLISTING">struct GtkRulerMetric{ gchar *metric_name; gchar *abbrev; /* This should be points_per_unit. This is the size of the unit * in 1/72nd's of an inch and has nothing to do with screen pixels */ gfloat pixels_per_unit; gfloat ruler_scale[10]; gint subdivide[5]; /* five possible modes of subdivision */};</PRE></TD></TR></TABLE><P>This should be points_per_unit. This is the size of the unit in 1/72nd's of an inch and has nothing to do with screen pixels. </P></DIV><HR><DIVCLASS="REFSECT2"><ANAME="AEN38357"></A><H3><ANAME="GTK-RULER-SET-METRIC"></A>gtk_ruler_set_metric ()</H3><TABLEBORDER="0"BGCOLOR="#D6E8FF"WIDTH="100%"CELLPADDING="6"><TR><TD><PRECLASS="PROGRAMLISTING">void gtk_ruler_set_metric (<AHREF="gtkruler.html">GtkRuler</A> *ruler, <AHREF="gtk-standard-enumerations.html#GTKMETRICTYPE">GtkMetricType</A> metric);</PRE></TD></TR></TABLE><P>This calls the <AHREF="gtk-standard-enumerations.html#GTKMETRICTYPE">GTKMetricType</A> to set the ruler to units defined. Available unitsare GTK_PIXELS, GTK_INCHES, or GTK_CENTIMETERS. The default unit of measurementis GTK_PIXELS.</P><DIVCLASS="INFORMALTABLE"><ANAME="AEN38365"></A><P></P><TABLEBORDER="0"WIDTH="100%"BGCOLOR="#FFD0D0"CELLSPACING="0"CELLPADDING="4"CLASS="CALSTABLE"><TBODY><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><TTCLASS="PARAMETER"><I>ruler</I></TT> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">the gtkruler</TD></TR><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><TTCLASS="PARAMETER"><I>metric</I></TT> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">the unit of measurement </TD></TR></TBODY></TABLE><P></P></DIV></DIV><HR><DIVCLASS="REFSECT2"><ANAME="AEN38378"></A><H3><ANAME="GTK-RULER-SET-RANGE"></A>gtk_ruler_set_range ()</H3><TABLEBORDER="0"BGCOLOR="#D6E8FF"WIDTH="100%"CELLPADDING="6"><TR><TD><PRECLASS="PROGRAMLISTING">void gtk_ruler_set_range (<AHREF="gtkruler.html">GtkRuler</A> *ruler, <AHREF=../glib/glib-basic-types.html#GFLOAT>gfloat</A> lower, <AHREF=../glib/glib-basic-types.html#GFLOAT>gfloat</A> upper, <AHREF=../glib/glib-basic-types.html#GFLOAT>gfloat</A> position, <AHREF=../glib/glib-basic-types.html#GFLOAT>gfloat</A> max_size);</PRE></TD></TR></TABLE><P>This sets the range of the ruler using gfloat lower, gfloat upper, gfloat position, and gfloat max_size. </P><DIVCLASS="INFORMALTABLE"><ANAME="AEN38388"></A><P></P><TABLEBORDER="0"WIDTH="100%"BGCOLOR="#FFD0D0"CELLSPACING="0"CELLPADDING="4"CLASS="CALSTABLE"><TBODY><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><TTCLASS="PARAMETER"><I>ruler</I></TT> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">the gtkruler</TD></TR><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><TTCLASS="PARAMETER"><I>lower</I></TT> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">the upper limit of the ruler</TD></TR><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><TTCLASS="PARAMETER"><I>upper</I></TT> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">the lower limit of the ruler</TD></TR><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><TTCLASS="PARAMETER"><I>position</I></TT> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">the mark on the ruler</TD></TR><TR><TDWIDTH="20%"ALIGN="RIGHT"VALIGN="TOP"><TTCLASS="PARAMETER"><I>max_size</I></TT> :</TD><TDWIDTH="80%"ALIGN="LEFT"VALIGN="TOP">the maximum size of the ruler </TD></TR></TBODY></TABLE><P></P></DIV></DIV></DIV><DIVCLASS="REFSECT1"><ANAME="AEN38413"></A><H2>See Also</H2><P><AHREF="gtkhruler.html">GtkHRuler</A>, <AHREF="gtkvruler.html">GtkVRuler</A></P></DIV><DIVCLASS="NAVFOOTER"><BRCLEAR="all"><BR><TABLEWIDTH="100%"BORDER="0"BGCOLOR="#000000"CELLPADDING="1"CELLSPACING="0"><TR><TDWIDTH="25%"BGCOLOR="#C00000"ALIGN="left"><AHREF="gtkrange.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B><<< Previous Page</B></FONT></A></TD><TDWIDTH="25%"BGCOLOR="#0000C0"ALIGN="center"><FONTCOLOR="#FFFFFF"SIZE="3"><B><AHREF="index.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Home</B></FONT></A></B></FONT></TD><TDWIDTH="25%"BGCOLOR="#00C000"ALIGN="center"><FONTCOLOR="#FFFFFF"SIZE="3"><B><AHREF="gtkobjects.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Up</B></FONT></A></B></FONT></TD><TDWIDTH="25%"BGCOLOR="#C00000"ALIGN="right"><AHREF="gtkscale.html"><FONTCOLOR="#FFFFFF"SIZE="3"><B>Next Page >>></B></FONT></A></TD></TR><TR><TDCOLSPAN="2"ALIGN="left"><FONTCOLOR="#FFFFFF"SIZE="3"><B>GtkRange</B></FONT></TD><TDCOLSPAN="2"ALIGN="right"><FONTCOLOR="#FFFFFF"SIZE="3"><B>GtkScale</B></FONT></TD></TR></TABLE></DIV></BODY></HTML>⌨️ 快捷键说明
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