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<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:svg="http://www.w3.org/2000/svg" xmlns:mml="http://www.w3.org/1998/Math/MathML"
          xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org"
          xml:lang="en" xml:id="figure_properties">
    <refnamediv>
        <refname>figure properties</refname>
        <refpurpose>description of the graphics
            figure entity properties
        </refpurpose>
    </refnamediv>
    <refsection>
        <title>Description</title>
        <para>The figure entity is the top level of the graphics entities hierarchy.
            This entity contain a number of properties designed to control many
            aspects of displaying Scilab graphics objects. These properties fall into
            two categories. Properties that contain information about figure itself
            and others related to set default values for the children creation.
        </para>
        <variablelist>
            <varlistentry>
                <term>Figure properties: </term>
                <listitem>
                    <variablelist>
                        <varlistentry>
                            <term>children: </term>
                            <listitem>
                                <para>This handles represent the vector of the figure's children .
                                    Note that all figure children are of type <literal>"Axes"</literal>.
                                    Also keep in mind that, when creating a figure entity (using
                                    <link linkend="scf">scf</link> command), an <literal>Axes</literal> entity is
                                    simultaneously built too.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>figure_position: </term>
                            <listitem>
                                <para>This field contains the position in pixel of the graphic
                                    window on the screen. This is a vector <literal>[x,y]</literal>
                                    defining the position of the upper-left corner of the window.
                                    The position <literal>[0,0]</literal> is the upper-left corner of the
                                    screen.
                                </para>
                                <para>The initial position of graphic windows is taken from the default figure entity (see
                                    <link linkend="gdf">gdf</link>). The only exception is when default figure <literal>figure_position</literal>
                                    value is <literal>[-1,-1]</literal>. In this case, the initial position of graphic windows is automatically set
                                    by the windowing system.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>figure_size: </term>
                            <listitem>
                                <para>
                                    Vector <literal>[width, height]</literal>, providing the
                                    external size of the graphic window, in screen pixels.
                                </para>
                                <para>
                                <warning>
                                    When the figure is docked (to the Scilab desktop, etc),
                                    .figure_size holds for the whole docked block and should not
                                    be set.
                                </warning>
                                <warning>
                                    The OS window manager defines some minimal sizes. If sizes
                                    smaller than minimal ones are provided, the minimal ones are
                                    actually set.
                                    <para>
                                        On Windows, minimal sizes can be retrieved with
                                        <screen><![CDATA[
--> [getsystemmetrics("SM_CXMIN") getsystemmetrics("SM_CYMIN")]
 ans  =
   158.   45.
]]></screen>
                                    </para>
                                </warning>
                                <warning>
                                    When a figure is created in .auto_resize="on" mode,
                                    the .axes_size value is set as specified, and .figure_size
                                    is set accordingly, not the reverse.
                                </warning>
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>axes_size: </term>
                            <listitem>
                                <para>
                                    Vector <literal>[width, height]</literal> of sizes of the whole
                                    graphical area in the window, in pixels.
                                </para>
                                <warning>
                                    This property should not be modified if the figure is docked
                                    to the Scilab desktop.
                                </warning>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>position: </term>
                            <listitem>
                                <para>
                                    <literal>.position = [x, y, graphics_width, graphics_height]</literal>
                                    or <literal>.position = 'x|y|graphics_width|graphics_height'</literal>
                                    (like '100|150|500|300')
                                    is a pseudo-property allowing to set or querry both
                                    <literal>.figure_position</literal> and <literal>.axes_size</literal>
                                    properties in a once.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>auto_resize: </term>
                            <listitem>
                                <para>
                                    Auto-resizing of children axes when the figure is resized.
                                </para>
                                <para>
                                    When the figure is resized by hand or by setting the
                                    .figure_size property, and .auto_resize is
                                    <table>
                                        <tr>
                                            <th>"on"</th>
                                            <td>Then the .axes_size is updated and axes contents
                                                are zoomed accordingly, without displaying scroll
                                                bars.
                                            </td>
                                        </tr>
                                        <tr>
                                            <th>"off"</th>
                                            <td>Then the .axes_size is kept unchanged. The display
                                                scale of children axes is unchanged. If the window
                                                gets smaller than axes sizes, some scroll bars are
                                                displayed.
                                            </td>
                                        </tr>
                                    </table>
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>viewport: </term>
                            <listitem>
                                <para>
                                    Position of the visible part of graphics in the panner.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>figure_name or name:</term>
                            <listitem>
                                <para>This field contains the name of the figure. This name is a
                                    character string displayed at the top of the graphics_window. The
                                    name can contain a single substring <literal>%d</literal> which will be
                                    replaced by the <literal>figure_id</literal>. No other instance of the
                                    <literal>%</literal> character is allowed inside the name.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>figure_id: </term>
                            <listitem>
                                <para>This field contains the identifier of the figure. This is an
                                    integer number which is set at figure creation and cannot be
                                    changed after.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>color_map: </term>
                            <listitem>
                                <para>Property which defines the colormap used by this figure. The
                                    colormap is a <literal>m</literal> by <literal>3</literal> matrix.
                                    <literal>m</literal> is the number of colors. Color number i is given as
                                    a 3-uple <literal>R</literal>, <literal>G</literal>, <literal>B</literal>
                                    corresponding respectively to red, green and blue intensity
                                    between 0 and 1.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>pixel_drawing_mode: </term>
                            <listitem>
                                <para>This field specifies the bitwise operation used for pixel rendering.
                                    The default mode is <literal>copy</literal>.
                                    For more details see the <link linkend="pixel_drawing_mode">pixel drawing mode reference page</link>.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>anti_aliasing: </term>
                            <listitem>
                                <para>
                                  This property controls the anti-aliasing level used to improve
                                  graphic quality.
                                  If the property is set to "off", anti-aliasing is disable.
                                  To enable anti-aliasing, the property must set to either
                                  "2x", "4x", "8x" or "16x". In this case, it stands for the
                                  anti-aliasing level.
                                  For example, "16x" is a higher quality level than "2x".
                                  Specifying a higher anti-aliasing level improves image quality
                                  but also decreases graphic performances.
                                  Please visit the <link linkend="anti_aliasing">dedicated page</link>
                                  to see specific examples.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>immediate_drawing: </term>
                            <listitem>
                                <para>This property controls the figure display. Its value can be
                                    <literal>"on"</literal> (default mode) or <literal>"off"</literal>. It is used
                                    to delay a huge succession of graphics commands (implying several
                                    drawings or redrawings). Note that, when using
                                    <literal>drawlater</literal> or <literal>drawnow</literal> commands, it
                                    affects the property value of the current figure (which is
                                    respectively turned to <literal>'off'</literal> or
                                    <literal>'on'</literal>).
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>background: </term>
                            <listitem>
                                <para>This property controls the figure window background color. It
                                    takes as value an index relative to the current colormap.
                                </para>
                            </listitem>
                        </varlistentry>
                       <varlistentry>
                            <term>BackgroundColor</term>
                            <listitem>
                                <para>
                                    This pseudo-property is a set-only one. It is the same as
                                    <literal>background</literal>, but allows to specify the color
                                    as a [r g b] vector of real values of Red Green and Blue
                                    intensities in [0,1] like <literal>[0.1, 0.5, 0.3]</literal>,
                                    or as a unique equivalent 'r|g|b' string like
                                    <literal>'0.1|0.5|0.3'</literal>, using "|" as a separator.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>event_handler</term>
                            <listitem>
                                <para>A character string. The name of the Scilab function which is intended
                                    to handle the events. Note that setting an empty string will disable
                                    the event handler. For more information about event handler functions see the
                                    <link linkend="eventhandlerfunctions">event handler functions</link> help.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>event_handler_enable</term>
                            <listitem>
                                <para>Enable or disable the event handler. Its value must be either
                                    "on" or "off".
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>user_data: </term>
                            <listitem>
                                <para>This field can be use to store any scilab variable in the
                                    figure data structure, and to retrieve it.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>tag: </term>
                            <listitem>
                                <para>This field can be use to store a character string generally used to identify the control. It allows to give it a "name". Mainly used in conjunction with findobj().</para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>resizefcn: </term>
                            <listitem>
                                <para>This field can be used to store the name of a Scilab function or a Scilab expression as a character string. This character string will be evaluated whenever the user resizes the figure and when the figure is created. </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>closerequestfcn: </term>
                            <listitem>
                                <para>This field can be used to store the name of a Scilab function or a Scilab expression as a character string. This character string will be evaluated whenever the user tries to close the figure using the top-right cross.</para>
                                <para>When this property is set, the "figure closed" event (-1000) will no more be trapped by the event handler function.</para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>resize: </term>
                            <listitem>
                                <para>
                                    <literal>"on"</literal> (default value) allows the user to interactively resize the figure with the mouse.
                                    <literal>"off"</literal> forbids to do it, but still allows using efficiently the <literal>.figure_size</literal> property.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>menubar_visible: </term>
                            <listitem>
                                <para>
                                    This property controls the figure menubar visibility. Its value can be <literal>"on"</literal> (default value) or <literal>"off"</literal>.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>toolbar_visible: </term>
                            <listitem>
                                <para>
                                    This property controls the figure toolbar visibility. Its value can be <literal>"on"</literal> (default value) or <literal>"off"</literal>.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>infobar_visible: </term>
                            <listitem>
                                <para>
                                    This property controls the figure status bar visibility. Its value can be <literal>"on"</literal> (default value) or <literal>"off"</literal>.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>info_message: </term>
                            <listitem>
                                <para>
                                    Single character string: text displayed in the info bar
                                    of the graphic window.
                                </para>
                                <note>
                                    A multi-line message is possible, using ascii(10) as lines
                                    separator, as with "Line #1"+ascii(10)+"Line #2".
                                    Styling the text is not possible (HTML styles not supported).
                                </note>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>visible: </term>
                            <listitem>
                                <para>
                                    When the figure <literal>"dockable"</literal> property is <literal>"off"</literal>, setting the <literal>"Visible"</literal> property affects the whole figure including its window decorations.
                                </para>
                                <para>
                                    When the figure <literal>"dockable"</literal> property is <literal>"on"</literal> and the figure is docked with another one inside the same parent window, this field concerns only the figure children (See dedicated part below). If the figure is not docked with another one, then the <literal>"Visible"</literal> property behaves as if the figure <literal>"dockable"</literal> property was set to <literal>"off"</literal>.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>layout: </term>
                            <listitem>
                                <para>
                                    This property sets the layout used to dispose the figure children. See <link linkend="layout">layout</link> page for more information about available layouts.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>layout_options: </term>
                            <listitem>
                                <para>
                                    This property sets the options of the layout used to dispose the figure children. See <link linkend="layout">layout</link> page for more information about available options.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>icon: </term>
                            <listitem>
                                <para>This field can be used to customize the icon of a Scilab figure.</para>
                                <para>
                                    Its value is a character string containing the (absolute or relative to Scilab <link linkend="pwd">current working directory.</link> path of the image file containing the icon.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>default_axes: </term>
                            <listitem>
                                <para>
                                    <literal>"on"</literal> (default value) means that the figure has always
                                    a default axes: it is automatically set at the figure creation,
                                    or automatically reset when the last axes of the figure is
                                    intentionally deleted.
                                </para>
                                <para>
                                    <literal>"off"</literal> means that
                                    <itemizedlist>
                                        <listitem>
                                            the newly created figure has no default axes.
                                        </listitem>
                                        <listitem>
                                            for an existing figure, it is possible to actually delete
                                            all its existing axes.
                                        </listitem>
                                    </itemizedlist>
                                    In both cases,
                                    <itemizedlist>
                                        <listitem>
                                            without any axes, the figure can't be the default
                                            target of any plotting instruction. This feature
                                            can be used to protect an interactive interface built in
                                            a figure (like the demos and the ATOMS ones) from being the default
                                            plotting target when there is no other proper opened
                                            graphical figures.
                                        </listitem>
                                        <listitem>
                                            It is still possible to force creating an axes using the
                                            <link linkend="newaxes">newaxes</link> function.
                                        </listitem>
                                    </itemizedlist>
                                </para>
                            </listitem>
                        </varlistentry>
                    </variablelist>
                </listitem>
            </varlistentry>
        </variablelist>
        <variablelist>
            <varlistentry>
                <term>Children's default values: </term>
                <listitem>
                    <variablelist>
                        <varlistentry>
                            <term>visible: </term>
                            <para>{"on"} | "off"</para>
                            <listitem>
                                <para>This field sets if the contents of the figure (axes and uicontrols) has to be
                                    redrawn. Its value should be <literal>"on"</literal> or <literal>"off"</literal>.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>rotation_style: </term>
                            <para>{"unary"} | "multiple"</para>
                            <listitem>
                                <para>This field is related to the "3D Rot" button. It takes
                                    <literal>unary</literal> as value (default) in the aim to rotate only
                                    selected 3D plot. In the other case its value can be
                                    <literal>multiple</literal> : all 3D plots are rotated.
                                </para>
                            </listitem>
                        </varlistentry>
                    </variablelist>
                </listitem>
            </varlistentry>
        </variablelist>
        <variablelist>
            <varlistentry>
                <term>Creation related properties: </term>
                <para>
                    Some properties must be set at creation time using the <link linkend="figure">figure</link> function and will be then read-only.
                </para>
                <listitem>
                    <variablelist>
                        <varlistentry>
                            <term>dockable</term>
                            <listitem>
                                <para>
                                    This property determines if created window can be docked inside Scilab environment. If its value is <literal>"on"</literal> then the window will have a bar enabling the user to dock/undock it. Else the window will look like a standard OS window. This value can only be set at creation.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>menubar</term>
                            <listitem>
                                <para>{"figure"} | "none"</para>
                                <para>
                                    This property determines the type of the menubar of the figure. If its value is <literal>"none"</literal> then the window will not have any menubar until a menu is added using <link linkend="uimenu">uimenu function</link>. Else the window will be created with default figure menus. This value can only be set at creation.
                                </para>
                            </listitem>
                        </varlistentry>
                        <varlistentry>
                            <term>toolbar</term>
                            <listitem>
                                <para>{"figure"} | "none"</para>
                                <para>
                                    This property determines the type of the toolbar of the figure. If its value is <literal>"none"</literal> then the window will not have any menubar. Else the window will be created with a default figure toolbar. This value can only be set at creation.
                                </para>
                            </listitem>
                        </varlistentry>
                    </variablelist>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>Note on default values: </term>
                <listitem>
                    <variablelist>
                        <varlistentry>
                            <term/>
                            <listitem>
                                <para>All these listed properties and fields inherit from default
                                    values stored in a figure model. These default values can be seen
                                    and changed. To do so, use the <literal>get("default_figure")</literal>
                                    command : it returns a graphic handle on the figure model. Note
                                    that no graphic window is created by this command. The next
                                    created figures will inherit from this model (see example 2
                                    below).
                                </para>
                            </listitem>
                        </varlistentry>
                    </variablelist>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsection>
    <refsection>
        <title>Examples</title>
        <programlisting role="example">
            <![CDATA[
lines(0) // disables vertical paging

//Example 1
f=get("current_figure") //get the handle of the current figure :
                        //if none exists, create a figure and return the corresponding handle
f.figure_position
f.figure_size=[200,200]
f.background=2
f.children  // man can see that an Axes entity already exists
delete(f);
f=gcf(); // macro shortcut <=> f=get("current_figure")
f.immediate_drawing = "off";
plot2d() // nothing happens on the screen...
f.immediate_drawing = "on";

//Example 2 : default_figure settings
df=get("default_figure") // get the default values (shortcut is gdf() )
// Let's change the defaults...
df.color_map=hot(128)
df.background= 110 // set background toa kind of yellow (Note that we
                   // are using a color index inside the color_map previously redefined)
scf(122); // creates new figure number 122 with the new default
plot2d()
scf(214);
t=-%pi:0.3:%pi;
plot3d(t,t,sin(t)'*cos(t),35,45,'X@Y@Z',[15,2,4]);
 ]]>
        </programlisting>
    </refsection>
    <refsection role="see also">
        <title>See also</title>
        <simplelist type="inline">
            <member>
                <link linkend="eventhandlerfunctions">event handler functions</link>
            </member>
            <member>
                <link linkend="pixel_drawing_mode">pixel_drawing_mode</link>
            </member>
            <member>
                <link linkend="anti_aliasing">anti_aliasing</link>
            </member>
            <member>
                <link linkend="colormap">colormap</link>
            </member>
            <member>
                <link linkend="scf">scf</link>
            </member>
            <member>
                <link linkend="gcf">gcf</link>
            </member>
            <member>
                <link linkend="gdf">gdf</link>
            </member>
            <member>
                <link linkend="get">get</link>
            </member>
            <member>
                <link linkend="set">set</link>
            </member>
            <member>
                <link linkend="axes_properties">axes_properties</link>
            </member>
            <member>
                <link linkend="getsystemmetrics">getsystemmetrics</link>
            </member>
        </simplelist>
    </refsection>
    <refsection>
        <title>History</title>
        <revhistory>
            <revision>
                <revnumber>5.4.0</revnumber>
                <revremark>New resizefcn &amp; closerequestfcn properties introduced.</revremark>
            </revision>
            <revision>
                <revnumber>5.5.0</revnumber>
                <revremark>
                    <itemizedlist>
                        <listitem>"visible" property meaning changed (uicontrols managed and the whole figure can be made invisible in some cases.</listitem>
                        <listitem>"icon" property added to allow figure icon change.</listitem>
                        <listitem>"menubar_visible" property added.</listitem>
                        <listitem>"toolbar_visible" property added.</listitem>
                        <listitem>"infobar_visible" property added.</listitem>
                        <listitem>"resize" property added.</listitem>
                        <listitem>"dockable" property added.</listitem>
                        <listitem>"menubar" property added.</listitem>
                        <listitem>"toolbar" property added.</listitem>
                        <listitem>"default_axes" property added.</listitem>
                        <listitem>"layout" property added.</listitem>
                        <listitem>"layout_options" property added.</listitem>
                    </itemizedlist>
                </revremark>
            </revision>
        </revhistory>
    </refsection>
</refentry>
