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<a name="Graphics-setup"></a>
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<a name="Graphics-setup-1"></a>
<h2 class="section">4.2 Graphics setup</h2>
<a name="index-MathGL-setup"></a>

<p>Functions and variables in this group influences on overall graphics appearance. So all of them should be placed <em>before</em> any actual plotting function calls.
</p>
<dl>
<dt><a name="index-DefaultPlotParam"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>DefaultPlotParam</b><i> ()</i></dt>
<dt><a name="index-mgl_005fset_005fdef_005fparam"></a><u>C function:</u> <code>void</code> <b>mgl_set_def_param</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Restore initial values for all of parameters.
</p></dd></dl>

<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top"><a href="#Transparency">4.2.1 Transparency</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Lighting">4.2.2 Lighting</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Fog">4.2.3 Fog</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Default-sizes">4.2.4 Default sizes</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Cutting">4.2.5 Cutting</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Font-settings">4.2.6 Font settings</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Palette-and-colors">4.2.7 Palette and colors</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top"><a href="#Error-handling">4.2.8 Error handling</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
</table>

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<a name="Transparency-1"></a>
<h3 class="subsection">4.2.1 Transparency</h3>
<a name="index-Alpha"></a>
<a name="index-SetAlphaDef"></a>
<a name="index-SetTranspType"></a>
<a name="index-AlphaDef"></a>
<a name="index-TranspType"></a>

<p>There are several functions and variables for setup transparency. The general function is <a href="#alpha">alpha</a> which switch on/off the transparency for overall plot. It influence only for graphics which created after <a href="#alpha">alpha</a> call (with one exception, OpenGL). Function <a href="#alphadef">alphadef</a> specify the default value of alpha-channel. Finally, function <a href="#transptype">transptype</a> set the kind of transparency. See section <a href="mathgl_en_18.html#Transparency-and-lighting">Transparency and lighting</a>, for sample code and picture.
</p>
<p><a name="alpha"></a>
</p><dl>
<dt><a name="index-alpha-2"></a><u>MGL command:</u> <b>alpha</b><i> <code>[val=on]</code></i></dt>
<dt><a name="index-Alpha-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>Alpha</b><i> (<code>bool</code> enable)</i></dt>
<dt><a name="index-mgl_005fset_005falpha"></a><u>C function:</u> <code>void</code> <b>mgl_set_alpha</b><i> (<code>HMGL</code> gr, <code>int</code> enable)</i></dt>
<dd><p>Sets the transparency on/off and returns previous value of transparency. It is recommended to call this function before any plotting command. Default value is transparency off.
</p></dd></dl>

<p><a name="alphadef"></a>
</p><dl>
<dt><a name="index-alphadef-1"></a><u>MGL command:</u> <b>alphadef</b><i> <code>val</code></i></dt>
<dt><a name="index-SetAlphaDef-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetAlphaDef</b><i> (<code>mreal</code> val)</i></dt>
<dt><a name="index-mgl_005fset_005falpha_005fdefault"></a><u>C function:</u> <code>void</code> <b>mgl_set_alpha_default</b><i> (<code>HMGL</code> gr, <code>mreal</code> alpha)</i></dt>
<dd><p>Sets default value of alpha channel (transparency) for all plotting functions. Initial value is 0.5.
</p></dd></dl>

<p><a name="transptype"></a>
</p><dl>
<dt><a name="index-transptype"></a><u>MGL command:</u> <b>transptype</b><i> <code>val</code></i></dt>
<dt><a name="index-SetTranspType-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetTranspType</b><i> (<code>int</code> type)</i></dt>
<dt><a name="index-mgl_005fset_005ftransp_005ftype"></a><u>C function:</u> <code>void</code> <b>mgl_set_transp_type</b><i> (<code>HMGL</code> gr, <code>int</code> type)</i></dt>
<dd><p>Set the type of transparency. Possible values are:
</p><ul>
<li>
Normal transparency (&lsquo;<samp>0</samp>&rsquo;) &ndash; below things is less visible than upper ones. It does not look well in OpenGL mode (mglGraphGL) for several surfaces.
</li><li>
Glass-like transparency (&lsquo;<samp>1</samp>&rsquo;) &ndash; below and upper things are commutable and just decrease intensity of light by RGB channel.
</li><li>
Lamp-like transparency (&lsquo;<samp>2</samp>&rsquo;) &ndash; below and upper things are commutable and are the source of some additional light. I recommend to set <code>SetAlphaDef(0.3)</code> or less for lamp-like transparency.
</li></ul>
<p>See section <a href="mathgl_en_18.html#Types-of-transparency">Types of transparency</a>, for sample code and picture..
</p></dd></dl>

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<a name="Lighting-1"></a>
<h3 class="subsection">4.2.2 Lighting</h3>
<a name="index-SetAmbient"></a>
<a name="index-AddLight"></a>
<a name="index-Light"></a>
<a name="index-Ambient"></a>

<p>There are several functions for setup lighting. The general function is <a href="#light">light</a> which switch on/off the lighting for overall plot. It influence only for graphics which created after <a href="#light">light</a> call (with one exception, OpenGL). Generally MathGL support up to 10 independent light sources. But in OpenGL mode only 8 of light sources is used due to OpenGL limitations. The position, color, brightness of each light source can be set separately. By default only one light source is active. It is source number <code>0</code> with white color, located at top of the plot.
</p>
<p><a name="light"></a>
</p><dl>
<dt><a name="index-light"></a><u>MGL command:</u> <b>light</b><i> <code>[val=on]</code></i></dt>
<dt><a name="index-Light-1"></a><u>Method on <code>mglGraph</code>:</u> <code>bool</code> <b>Light</b><i> (<code>bool</code> enable)</i></dt>
<dt><a name="index-mgl_005fset_005flight"></a><u>C function:</u> <code>void</code> <b>mgl_set_light</b><i> (<code>HMGL</code> gr, <code>int</code> enable)</i></dt>
<dd><p>Sets the using of light on/off for overall plot. Function returns previous value of lighting. Default value is lightning off.
</p></dd></dl>

<dl>
<dt><a name="index-light-1"></a><u>MGL command:</u> <b>light</b><i> <code>num</code> <code>val</code></i></dt>
<dt><a name="index-Light-2"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>Light</b><i> (<code>int</code> n, <code>bool</code> enable)</i></dt>
<dt><a name="index-mgl_005fset_005flight_005fn"></a><u>C function:</u> <code>void</code> <b>mgl_set_light_n</b><i> (<code>HMGL</code> gr, <code>int</code> n, <code>int</code> enable)</i></dt>
<dd><p>Switch on/off <var>n</var>-th light source separately.
</p></dd></dl>

<dl>
<dt><a name="index-light-2"></a><u>MGL command:</u> <b>light</b><i> <code>num xdir ydir zdir</code> ['col'='w' <code>br=0.5</code>]</i></dt>
<dt><a name="index-light-3"></a><u>MGL command:</u> <b>light</b><i> <code>num xdir ydir zdir xpos ypos zpos</code> ['col'='w' <code>br=0.5</code>]</i></dt>
<dt><a name="index-AddLight-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>AddLight</b><i> (<code>int</code> n, <code>mglPoint</code> d, <code>char</code> c=<code>'w'</code>, <code>mreal</code> bright=<code>0.5</code>, <code>mreal</code> ap=<code>0</code>)</i></dt>
<dt><a name="index-AddLight-2"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>AddLight</b><i> (<code>int</code> n, <code>mglPoint</code> r, <code>mglPoint</code> d, <code>char</code> c=<code>'w'</code>, <code>mreal</code> bright=<code>0.5</code>, <code>mreal</code> ap=<code>0</code>)</i></dt>
<dt><a name="index-mgl_005fadd_005flight"></a><u>C function:</u> <code>void</code> <b>mgl_add_light</b><i> (<code>HMGL</code> gr, <code>int</code> n, <code>mreal</code> dx, <code>mreal</code> dy, <code>mreal</code> dz)</i></dt>
<dt><a name="index-mgl_005fadd_005flight_005fext"></a><u>C function:</u> <code>void</code> <b>mgl_add_light_ext</b><i> (<code>HMGL</code> gr, <code>int</code> n, <code>mreal</code> dx, <code>mreal</code> dy, <code>mreal</code> dz, <code>char</code> c, <code>mreal</code> bright, <code>mreal</code> ap)</i></dt>
<dt><a name="index-mgl_005fadd_005flight_005floc"></a><u>C function:</u> <code>void</code> <b>mgl_add_light_loc</b><i> (<code>HMGL</code> gr, <code>int</code> n, <code>mreal</code> rx, <code>mreal</code> ry, <code>mreal</code> rz, <code>mreal</code> dx, <code>mreal</code> dy, <code>mreal</code> dz, <code>char</code> c, <code>mreal</code> bright, <code>mreal</code> ap)</i></dt>
<dd><p>The function adds a light source with identification <var>n</var> in direction <var>d</var> with color <var>c</var> and with brightness <var>bright</var> (which must be in range [0,1]). If position <var>r</var> is specified and isn&rsquo;t NAN then light source is supposed to be local otherwise light source is supposed to be placed at infinity.
</p></dd></dl>

<p><a name="diffuse"></a>
</p><dl>
<dt><a name="index-SetDifLight"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetDifLight</b><i> (<code>bool</code> enable)</i></dt>
<dt><a name="index-mgl_005fset_005flight_005fdif"></a><u>C function:</u> <code>void</code> <b>mgl_set_light_dif</b><i> (<code>HMGL</code> gr, <code>int</code> enable)</i></dt>
<dd><p>Set on/off to use diffusive light (only for local light sources).
</p></dd></dl>

<p><a name="ambient"></a>
</p><dl>
<dt><a name="index-ambient"></a><u>MGL command:</u> <b>ambient</b><i> <code>val</code></i></dt>
<dt><a name="index-SetAmbient-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetAmbient</b><i> (<code>mreal</code> bright=<code>0.5</code>)</i></dt>
<dt><a name="index-mgl_005fset_005fambbr"></a><u>C function:</u> <code>void</code> <b>mgl_set_ambbr</b><i> (<code>HMGL</code> gr, <code>mreal</code> bright)</i></dt>
<dd><p>Sets the brightness of ambient light. The value should be in range [0,1].
</p></dd></dl>

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<a name="Fog-1"></a>
<h3 class="subsection">4.2.3 Fog</h3>
<a name="index-Fog"></a>

<p><a name="fog"></a>
</p><dl>
<dt><a name="index-fog"></a><u>MGL command:</u> <b>fog</b><i> <code>val [dz=0.25]</code></i></dt>
<dt><a name="index-Fog-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>Fog</b><i> (<code>mreal</code> d, <code>mreal</code> dz=<code>0.25</code>)</i></dt>
<dt><a name="index-mgl_005fset_005ffog"></a><u>C function:</u> <code>void</code> <b>mgl_set_fog</b><i> (<code>HMGL</code> gr, <code>mreal</code> d, <code>mreal</code> dz)</i></dt>
<dd><p>Function imitate a fog in the plot. Fog start from relative distance <var>dz</var> from view point and its density growths exponentially in depth. So that the fog influence is determined by law ~ 1-exp(-<em>d*z</em>). Here <em>z</em> is normalized to 1 depth of the plot. If value <var>d</var>=<code>0</code> then the fog is absent. Note, that fog was applied at stage of image creation, not at stage of drawing. See section <a href="mathgl_en_18.html#Adding-fog">Adding fog</a>, for sample code and picture.
</p></dd></dl>

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<a name="Default-sizes-1"></a>
<h3 class="subsection">4.2.4 Default sizes</h3>
<a name="index-SetBarWidth"></a>
<a name="index-SetMarkSize"></a>
<a name="index-SetArrowSize"></a>
<a name="index-SetMeshNum"></a>
<a name="index-SetPlotId"></a>
<a name="index-BarWidth"></a>
<a name="index-MarkSize"></a>
<a name="index-ArrowSize"></a>
<a name="index-MeshNum"></a>

<p>These variables control the default (initial) values for most graphics parameters including sizes of markers, arrows, line width and so on. As any other settings these ones will influence only on plots created after the settings change.
</p>
<p><a name="barwidth"></a>
</p><dl>
<dt><a name="index-barwidth"></a><u>MGL command:</u> <b>barwidth</b><i> <code>val</code></i></dt>
<dt><a name="index-SetBarWidth-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetBarWidth</b><i> ( <code>mreal</code> val)</i></dt>
<dt><a name="index-mgl_005fset_005fbar_005fwidth"></a><u>C function:</u> <code>void</code> <b>mgl_set_bar_width</b><i> (<code>HMGL</code> gr, <code>mreal</code> val)</i></dt>
<dd><p>Sets relative width of rectangles in <a href="mathgl_en_39.html#bars">bars</a>, <a href="mathgl_en_39.html#barh">barh</a>, <a href="mathgl_en_39.html#boxplot">boxplot</a>, <a href="mathgl_en_39.html#candle">candle</a>. Default value is <code>0.7</code>.
</p></dd></dl>

<p><a name="marksize"></a>
</p><dl>
<dt><a name="index-marksize"></a><u>MGL command:</u> <b>marksize</b><i> <code>val</code></i></dt>
<dt><a name="index-SetMarkSize-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetMarkSize</b><i> (<code>mreal</code> val)</i></dt>
<dt><a name="index-mgl_005fset_005fmark_005fsize"></a><u>C function:</u> <code>void</code> <b>mgl_set_mark_size</b><i> (<code>HMGL</code> gr, <code>mreal</code> val)</i></dt>
<dd><p>Sets size of marks for <a href="mathgl_en_39.html#g_t1D-plotting">1D plotting</a>. Default value is <code>1</code>.
</p></dd></dl>

<p><a name="arrowsize"></a>
</p><dl>
<dt><a name="index-arrowsize"></a><u>MGL command:</u> <b>arrowsize</b><i> <code>val</code></i></dt>
<dt><a name="index-SetArrowSize-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetArrowSize</b><i> (<code>mreal</code> val)</i></dt>
<dt><a name="index-mgl_005fset_005farrow_005fsize"></a><u>C function:</u> <code>void</code> <b>mgl_set_arrow_size</b><i> (<code>HMGL</code> gr, <code>mreal</code> val)</i></dt>
<dd><p>Sets size of arrows for <a href="mathgl_en_39.html#g_t1D-plotting">1D plotting</a>, lines and curves (see <a href="mathgl_en_35.html#Primitives">Primitives</a>). Default value is <code>1</code>.
</p></dd></dl>

<p><a name="meshnum"></a>
<a name="MeshNum"></a>
</p><dl>
<dt><a name="index-meshnum-2"></a><u>MGL command:</u> <b>meshnum</b><i> <code>val</code></i></dt>
<dt><a name="index-SetMeshNum-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetMeshNum</b><i> (<code>int</code> val)</i></dt>
<dt><a name="index-mgl_005fset_005fmeshnum"></a><u>C function:</u> <code>void</code> <b>mgl_set_meshnum</b><i> (<code>HMGL</code> gr, <code>int</code> num)</i></dt>
<dd><p>Sets approximate number of lines in <a href="mathgl_en_40.html#mesh">mesh</a>, <a href="mathgl_en_40.html#fall">fall</a>, <a href="mathgl_en_37.html#grid">grid</a> and also the number of hachures in <a href="mathgl_en_43.html#vect">vect</a>, <a href="mathgl_en_43.html#dew">dew</a> and the number of cells in <a href="mathgl_en_41.html#cloud">cloud</a>. By default (=0) it draws all lines/hachures/cells.
</p></dd></dl>

<p><a name="facenum"></a>
</p><dl>
<dt><a name="index-facenum"></a><u>MGL command:</u> <b>facenum</b><i> <code>val</code></i></dt>
<dt><a name="index-SetFaceNum"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetFaceNum</b><i> (<code>int</code> val)</i></dt>
<dt><a name="index-mgl_005fset_005ffacenum"></a><u>C function:</u> <code>void</code> <b>mgl_set_facenum</b><i> (<code>HMGL</code> gr, <code>int</code> num)</i></dt>
<dd><p>Sets approximate number of visible faces. Can be used for speeding up drawing by cost of lower quality. By default (=0) it draws all of them.
</p></dd></dl>

<p><a name="plotid"></a>
</p><dl>
<dt><a name="index-plotid"></a><u>MGL command:</u> <b>plotid</b><i> 'id'</i></dt>
<dt><a name="index-SetPlotId-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetPlotId</b><i> (<code>const char *</code>id)</i></dt>
<dt><a name="index-mgl_005fset_005fplotid"></a><u>C function:</u> <code>void</code> <b>mgl_set_plotid</b><i> (<code>HMGL</code> gr, <code>const char *</code>id)</i></dt>
<dd><p>Sets default name <var>id</var> as filename for saving (in FLTK window for example).
</p></dd></dl>

<dl>
<dt><a name="index-GetPlotId"></a><u>Method on <code>mglGraph</code>:</u> <code>const char *</code> <b>GetPlotId</b><i> ()</i></dt>
<dt><a name="index-mgl_005fget_005fplotid"></a><u>C function:</u> <code>const char *</code> <b>mgl_get_plotid</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Gets default name <var>id</var> as filename for saving (in FLTK window for example).
</p></dd></dl>

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<a name="Cutting-1"></a>
<h3 class="subsection">4.2.5 Cutting</h3>
<a name="index-SetCut"></a>
<a name="index-SetCutBox"></a>
<a name="index-CutOff"></a>
<a name="index-Cut"></a>

<p>These variables and functions set the condition when the points are excluded (cutted) from the drawing. Note, that a point with NAN value(s) of coordinate or amplitude will be automatically excluded from the drawing. See section <a href="mathgl_en_11.html#Cutting-sample">Cutting sample</a>, for sample code and picture.
</p>
<p><a name="cut"></a>
</p><dl>
<dt><a name="index-cut-2"></a><u>MGL command:</u> <b>cut</b><i> <code>val</code></i></dt>
<dt><a name="index-SetCut-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetCut</b><i> (<code>bool</code> val)</i></dt>
<dt><a name="index-mgl_005fset_005fcut"></a><u>C function:</u> <code>void</code> <b>mgl_set_cut</b><i> (<code>HMGL</code> gr, <code>int</code> val)</i></dt>
<dd><p>Flag which determines how points outside bounding box are drawn. If it is <code>true</code> then points are excluded from plot (it is default) otherwise the points are projected to edges of bounding box.
</p></dd></dl>

<dl>
<dt><a name="index-cut-3"></a><u>MGL command:</u> <b>cut</b><i> <code>x1 y1 z1 x2 y2 z2</code></i></dt>
<dt><a name="index-SetCutBox-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetCutBox</b><i> (<code>mglPoint</code> p1, <code>mglPoint</code> p1)</i></dt>
<dt><a name="index-mgl_005fset_005fcut_005fbox"></a><u>C function:</u> <code>void</code> <b>mgl_set_cut_box</b><i> (<code>HMGL</code> gr, <code>mreal</code> x1, <code>mreal</code> y1, <code>mreal</code> z1, <code>mreal</code> x2, <code>mreal</code> y2, <code>mreal</code> z2)</i></dt>
<dd><p>Lower and upper edge of the box in which never points are drawn. If both edges are the same (the variables are equal) then the cutting box is empty.
</p></dd></dl>

<dl>
<dt><a name="index-cut-4"></a><u>MGL command:</u> <b>cut</b><i> 'cond'</i></dt>
<dt><a name="index-CutOff-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>CutOff</b><i> (<code>const char *</code>cond)</i></dt>
<dt><a name="index-mgl_005fset_005fcutoff"></a><u>C function:</u> <code>void</code> <b>mgl_set_cutoff</b><i> (<code>HMGL</code> gr, <code>const char *</code>cond)</i></dt>
<dd><p>Sets the cutting off condition by formula <var>cond</var>. This condition determine will point be plotted or not. If value of formula is nonzero then point is omitted, otherwise it plotted. Set argument as <code>&quot;&quot;</code> to disable cutting off condition.
</p></dd></dl>

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<a name="Font-settings-1"></a>
<h3 class="subsection">4.2.6 Font settings</h3>
<a name="index-SetFontSize"></a>
<a name="index-SetFontDef"></a>
<a name="index-SetRotatedText"></a>
<a name="index-SetFontSizePT"></a>
<a name="index-SetFontSizeCM"></a>
<a name="index-SetFontSizeIN"></a>
<a name="index-LoadFont"></a>
<a name="index-CopyFont"></a>
<a name="index-RestoreFont"></a>
<a name="index-Font"></a>
<a name="index-RotateText"></a>

<p><a name="font"></a>
</p><dl>
<dt><a name="index-font"></a><u>MGL command:</u> <b>font</b><i> 'fnt' [<code>val=6</code>]</i></dt>
<dd><p>Font style for text and labels (see text). Initial style is &rsquo;fnt&rsquo;=&rsquo;:rC&rsquo; give Roman font with centering. Parameter <code>val</code> sets the size of font for tick and axis labels. Default font size of axis labels is 1.4 times large than for tick labels. For more detail, see <a href="mathgl_en_25.html#Font-styles">Font styles</a>.
</p></dd></dl>

<p><a name="rotatetext"></a>
</p><dl>
<dt><a name="index-rotatetext"></a><u>MGL command:</u> <b>rotatetext</b><i> <code>val</code></i></dt>
<dt><a name="index-SetRotatedText-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetRotatedText</b><i> (<code>bool</code> val)</i></dt>
<dt><a name="index-mgl_005fset_005frotated_005ftext"></a><u>C function:</u> <code>void</code> <b>mgl_set_rotated_text</b><i> (<code>HMGL</code> gr, <code>int</code> val)</i></dt>
<dd><p>Sets to use or not text rotation.
</p></dd></dl>

<p><a name="loadfont"></a>
</p><dl>
<dt><a name="index-loadfont"></a><u>MGL command:</u> <b>loadfont</b><i> ['name'='']</i></dt>
<dt><a name="index-LoadFont-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>LoadFont</b><i> (<code>const char *</code>name, <code>const char *</code>path=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fload_005ffont"></a><u>C function:</u> <code>void</code> <b>mgl_load_font</b><i> (<code>HMGL</code> gr, <code>const char *</code>name, <code>const char *</code>path)</i></dt>
<dd><p>Load font typeface from <var>path</var>/<var>name</var>. Empty name will load default font.
</p></dd></dl>

<dl>
<dt><a name="index-SetFontDef-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetFontDef</b><i> (<code>const char *</code>fnt)</i></dt>
<dt><a name="index-mgl_005fset_005ffont_005fdef"></a><u>C function:</u> <code>void</code> <b>mgl_set_font_def</b><i> (<code>HMGL</code> gr, <code>const char *</code> val)</i></dt>
<dd><p>Sets the font specification (see <a href="mathgl_en_36.html#Text-printing">Text printing</a>). Default is &lsquo;<samp>rC</samp>&rsquo; &ndash; Roman font centering.
</p></dd></dl>

<dl>
<dt><a name="index-SetFontSize-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetFontSize</b><i> (<code>mreal</code> val)</i></dt>
<dt><a name="index-mgl_005fset_005ffont_005fsize"></a><u>C function:</u> <code>void</code> <b>mgl_set_font_size</b><i> (<code>HMGL</code> gr, <code>mreal</code> val)</i></dt>
<dd><p>Sets the size of font for tick and axis labels. Default font size of axis labels is 1.4 times large than for tick labels.
</p></dd></dl>

<dl>
<dt><a name="index-SetFontSizePT-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetFontSizePT</b><i> (<code>mreal</code> cm, <code>int</code> dpi=<code>72</code>)</i></dt>
<dd><p>Set FontSize by size in pt and picture DPI (default is 16 pt for dpi=72).
</p></dd></dl>
<dl>
<dt><a name="index-SetFontSizeCM-1"></a><u>Method on <code>mglGraph</code>:</u> <code>inline void</code> <b>SetFontSizeCM</b><i> (<code>mreal</code> cm, <code>int</code> dpi=<code>72</code>)</i></dt>
<dd><p>Set FontSize by size in centimeters and picture DPI (default is 0.56 cm = 16 pt).
</p></dd></dl>
<dl>
<dt><a name="index-SetFontSizeIN-1"></a><u>Method on <code>mglGraph</code>:</u> <code>inline void</code> <b>SetFontSizeIN</b><i> (<code>mreal</code> cm, <code>int</code> dpi=<code>72</code>)</i></dt>
<dd><p>Set FontSize by size in inch and picture DPI (default is 0.22 in = 16 pt).
</p></dd></dl>

<dl>
<dt><a name="index-LoadFont-2"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>LoadFont</b><i> (<code>const char *</code>name, <code>const char *</code>path=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fload_005ffont-1"></a><u>C function:</u> <code>void</code> <b>mgl_load_font</b><i> (<code>HMGL</code> gr, <code>const char *</code>name, <code>const char *</code>path)</i></dt>
<dd><p>Load font typeface from <var>path</var>/<var>name</var>.
</p></dd></dl>

<dl>
<dt><a name="index-CopyFont-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>CopyFont</b><i> (<code>mglGraph *</code> from)</i></dt>
<dt><a name="index-mgl_005fcopy_005ffont"></a><u>C function:</u> <code>void</code> <b>mgl_copy_font</b><i> (<code>HMGL</code> gr, <code>HMGL</code> gr_from)</i></dt>
<dd><p>Copy font data from another <code>mglGraph</code> object.
</p></dd></dl>

<dl>
<dt><a name="index-RestoreFont-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>RestoreFont</b><i> ()</i></dt>
<dt><a name="index-mgl_005frestore_005ffont"></a><u>C function:</u> <code>void</code> <b>mgl_restore_font</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Restore font data to default typeface.
</p></dd></dl>

<dl>
<dt><a name="index-mgl_005fdef_005ffont"></a><u>Функция С:</u> <code>void</code> <b>mgl_def_font</b><i> (<code>const char *</code>name, <code>const char *</code>path)</i></dt>
<dd><p>Load default font typeface (for all newly created HMGL/mglGraph objects) from <var>path</var>/<var>name</var>.
</p></dd></dl>


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<a name="Palette-and-colors-1"></a>
<h3 class="subsection">4.2.7 Palette and colors</h3>
<a name="index-SetPalette"></a>
<a name="index-Palette"></a>

<p><a name="palette"></a>
</p><dl>
<dt><a name="index-palette"></a><u>MGL command:</u> <b>palette</b><i> 'colors'</i></dt>
<dt><a name="index-SetPalette-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetPalette</b><i> (<code>const char *</code>colors)</i></dt>
<dt><a name="index-mgl_005fset_005fpalette"></a><u>C function:</u> <code>void</code> <b>mgl_set_palette</b><i> (<code>HMGL</code> gr, <code>const char *</code>colors)</i></dt>
<dd><p>Sets the palette as selected colors. Default value is <code>&quot;Hbgrcmyhlnqeup&quot;</code> that corresponds to colors: dark gray &lsquo;<samp>H</samp>&rsquo;, blue &lsquo;<samp>b</samp>&rsquo;, green &lsquo;<samp>g</samp>&rsquo;, red &lsquo;<samp>r</samp>&rsquo;, cyan &lsquo;<samp>c</samp>&rsquo;, magenta &lsquo;<samp>m</samp>&rsquo;, yellow &lsquo;<samp>y</samp>&rsquo;, gray &lsquo;<samp>h</samp>&rsquo;, blue-green &lsquo;<samp>l</samp>&rsquo;, sky-blue &lsquo;<samp>n</samp>&rsquo;, orange &lsquo;<samp>q</samp>&rsquo;, yellow-green &lsquo;<samp>e</samp>&rsquo;, blue-violet &lsquo;<samp>u</samp>&rsquo;, purple &lsquo;<samp>p</samp>&rsquo;. The palette is used mostly in 1D plots (see <a href="mathgl_en_39.html#g_t1D-plotting">1D plotting</a>) for curves which styles are not specified. Internal color counter will be nullified by any change of palette. This includes even hidden change (for example, by <a href="mathgl_en_37.html#box">box</a> or <a href="mathgl_en_37.html#axis">axis</a> functions).
</p></dd></dl>

<dl>
<dt><a name="index-SetDefScheme"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetDefScheme</b><i> (<code>const char *</code>sch)</i></dt>
<dt><a name="index-mgl_005fset_005fdef_005fsch"></a><u>C function:</u> <code>void</code> <b>mgl_set_def_sch</b><i> (<code>HMGL</code> gr, <code>const char *</code>sch)</i></dt>
<dd><p>Sets the <var>sch</var> as default color scheme. Default value is <code>&quot;BbcyrR&quot;</code>.
</p></dd></dl>

<dl>
<dt><a name="index-mgl_005fset_005fcolor"></a><u>C function:</u> <code>void</code> <b>mgl_set_color</b><i> (<code>char</code> id, <code>mreal</code> r, <code>mreal</code> g, <code>mreal</code> b)</i></dt>
<dd><p>Sets RGB values for color with given <var>id</var>.
</p></dd></dl>

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<a name="Error-handling-1"></a>
<h3 class="subsection">4.2.8 Error handling</h3>
<a name="index-Message"></a>
<a name="index-SetWarn"></a>
<a name="index-GetWarn"></a>

<p>Normally user should set it to zero by <code>SetWarn(0);</code> before plotting and check if <code>GetWarnCode()</code> or <code>Message()</code> return non zero after plotting. Only last warning will be saved. All warnings/errors produced by MathGL is not critical &ndash; the plot just will not be drawn.
</p>
<dl>
<dt><a name="index-SetWarn-1"></a><u>Method on <code>mglGraph</code>:</u> <code>void</code> <b>SetWarn</b><i> (<code>int</code> code, <code>const char *</code>info=<code>&quot;&quot;</code>)</i></dt>
<dt><a name="index-mgl_005fset_005fwarn"></a><u>C function:</u> <code>void</code> <b>mgl_set_warn</b><i> (<code>HMGL</code> gr, <code>int</code> code, <code>const char *</code>info)</i></dt>
<dd><p>Set warning code. Normally you should call this function only for clearing the warning state, i.e. call <code>SetWarn(0);</code>. Text <var>info</var> will be printed as is if <var>code</var>&lt;0.
</p></dd></dl>

<dl>
<dt><a name="index-Message-1"></a><u>Method on <code>mglGraph</code>:</u> <code>const char *</code> <b>Message</b><i> ()</i></dt>
<dt><a name="index-mgl_005fget_005fmess"></a><u>C function:</u> <code>const char *</code> <b>mgl_get_mess</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Return messages about matters why some plot are not drawn. If returned string is empty then there are no messages.
</p></dd></dl>

<dl>
<dt><a name="index-GetWarnCode"></a><u>Method on <code>mglGraph</code>:</u> <code>int</code> <b>GetWarnCode</b><i> ()</i></dt>
<dt><a name="index-mgl_005fget_005fwarn_005fcode"></a><u>C function:</u> <code>int</code> <b>mgl_get_warn_code</b><i> (<code>HMGL</code> gr)</i></dt>
<dd><p>Return the numerical ID of warning about the not drawn plot. Possible values are:
</p><dl compact="compact">
<dt> <code>mglWarnNone=0</code></dt>
<dd><p>Everything OK
</p></dd>
<dt> <code>mglWarnDim</code></dt>
<dd><p>Data dimension(s) is incompatible
</p></dd>
<dt> <code>mglWarnLow</code></dt>
<dd><p>Data dimension(s) is too small
</p></dd>
<dt> <code>mglWarnNeg</code></dt>
<dd><p>Minimal data value is negative
</p></dd>
<dt> <code>mglWarnFile</code></dt>
<dd><p>No file or wrong data dimensions
</p></dd>
<dt> <code>mglWarnMem</code></dt>
<dd><p>Not enough memory
</p></dd>
<dt> <code>mglWarnZero</code></dt>
<dd><p>Data values are zero
</p></dd>
<dt> <code>mglWarnLegA</code></dt>
<dd><p>Too many legend entries
</p></dd>
<dt> <code>mglWarnLeg</code></dt>
<dd><p>No legend entries
</p></dd>
<dt> <code>mglWarnSlc</code></dt>
<dd><p>Slice value is out of range
</p></dd>
<dt> <code>mglWarnCnt</code></dt>
<dd><p>Number of contours is zero or negative
</p></dd>
<dt> <code>mglWarnOpen</code></dt>
<dd><p>Couldn&rsquo;t open file
</p></dd>
<dt> <code>mglWarnLId</code></dt>
<dd><p>Light: ID is out of range
</p></dd>
<dt> <code>mglWarnSize</code></dt>
<dd><p>Setsize: size(s) is zero or negative
</p></dd>
<dt> <code>mglWarnFmt</code></dt>
<dd><p>Format is not supported for that build
</p></dd>
</dl>
</dd></dl>



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