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|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#libgimpbase-gimpunit.description" class="shortcut">Description</a></span>
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<div class="refentry">
<a name="libgimpbase-gimpunit"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libgimpbase-gimpunit.top_of_page"></a>gimpunit</span></h2>
<p>gimpunit — Provides a collection of predefined units and
functions for creating user-defined units.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libgimpbase-gimpunit.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_proto_type">
<col class="functions_proto_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">gint</span>
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-number-of-units" title="gimp_unit_get_number_of_units ()">gimp_unit_get_number_of_units</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint</span>
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-number-of-built-in-units" title="gimp_unit_get_number_of_built_in_units ()">gimp_unit_get_number_of_built_in_units</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="returnvalue">GimpUnit</span></a>
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-new" title="gimp_unit_new ()">gimp_unit_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-deletion-flag" title="gimp_unit_get_deletion_flag ()">gimp_unit_get_deletion_flag</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-set-deletion-flag" title="gimp_unit_set_deletion_flag ()">gimp_unit_set_deletion_flag</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gdouble</span>
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-factor" title="gimp_unit_get_factor ()">gimp_unit_get_factor</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint</span>
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-digits" title="gimp_unit_get_digits ()">gimp_unit_get_digits</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gint</span>
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-scaled-digits" title="gimp_unit_get_scaled_digits ()">gimp_unit_get_scaled_digits</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-identifier" title="gimp_unit_get_identifier ()">gimp_unit_get_identifier</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-symbol" title="gimp_unit_get_symbol ()">gimp_unit_get_symbol</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-abbreviation" title="gimp_unit_get_abbreviation ()">gimp_unit_get_abbreviation</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-singular" title="gimp_unit_get_singular ()">gimp_unit_get_singular</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-plural" title="gimp_unit_get_plural ()">gimp_unit_get_plural</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gchar</span> *
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-format-string" title="gimp_unit_format_string ()">gimp_unit_format_string</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gdouble</span>
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-pixels-to-units" title="gimp_pixels_to_units ()">gimp_pixels_to_units</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gdouble</span>
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-units-to-pixels" title="gimp_units_to_pixels ()">gimp_units_to_pixels</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gdouble</span>
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-units-to-points" title="gimp_units_to_points ()">gimp_units_to_points</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-is-metric" title="gimp_unit_is_metric ()">gimp_unit_is_metric</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#GIMP-IS-PARAM-SPEC-UNIT:CAPS" title="GIMP_IS_PARAM_SPEC_UNIT()">GIMP_IS_PARAM_SPEC_UNIT</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">GParamSpec</span> *
</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#gimp-param-spec-unit" title="gimp_param_spec_unit ()">gimp_param_spec_unit</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="libgimpbase-gimpunit.html#GIMP-VALUE-HOLDS-UNIT:CAPS" title="GIMP_VALUE_HOLDS_UNIT()">GIMP_VALUE_HOLDS_UNIT</a><span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libgimpbase-gimpunit.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="other_proto_type">
<col class="other_proto_name">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit">GimpUnit</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libgimpbase-gimpunit.html#GIMP-TYPE-UNIT:CAPS" title="GIMP_TYPE_UNIT">GIMP_TYPE_UNIT</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libgimpbase-gimpunit.html#GIMP-TYPE-PARAM-UNIT:CAPS" title="GIMP_TYPE_PARAM_UNIT">GIMP_TYPE_PARAM_UNIT</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libgimpbase-gimpunit.description"></a><h2>Description</h2>
<p>Provides a collection of predefined units and functions for
creating user-defined units.</p>
</div>
<div class="refsect1">
<a name="libgimpbase-gimpunit.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gimp-unit-get-number-of-units"></a><h3>gimp_unit_get_number_of_units ()</h3>
<pre class="programlisting"><span class="returnvalue">gint</span>
gimp_unit_get_number_of_units (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Returns the number of units which are known to the <a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> system.</p>
<div class="refsect3">
<a name="gimp-unit-get-number-of-units.returns"></a><h4>Returns</h4>
<p> The number of defined units.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-get-number-of-built-in-units"></a><h3>gimp_unit_get_number_of_built_in_units ()</h3>
<pre class="programlisting"><span class="returnvalue">gint</span>
gimp_unit_get_number_of_built_in_units
(<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Returns the number of <a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a>'s which are hardcoded in the unit system
(UNIT_INCH, UNIT_MM, UNIT_POINT, UNIT_PICA and the two "pseudo unit"
UNIT_PIXEL).</p>
<div class="refsect3">
<a name="gimp-unit-get-number-of-built-in-units.returns"></a><h4>Returns</h4>
<p> The number of built-in units.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-new"></a><h3>gimp_unit_new ()</h3>
<pre class="programlisting"><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="returnvalue">GimpUnit</span></a>
gimp_unit_new (<em class="parameter"><code><span class="type">gchar</span> *identifier</code></em>,
<em class="parameter"><code><span class="type">gdouble</span> factor</code></em>,
<em class="parameter"><code><span class="type">gint</span> digits</code></em>,
<em class="parameter"><code><span class="type">gchar</span> *symbol</code></em>,
<em class="parameter"><code><span class="type">gchar</span> *abbreviation</code></em>,
<em class="parameter"><code><span class="type">gchar</span> *singular</code></em>,
<em class="parameter"><code><span class="type">gchar</span> *plural</code></em>);</pre>
<p>Returns the integer ID of the new <a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a>.</p>
<p>Note that a new unit is always created with its deletion flag
set to <code class="literal">TRUE</code>. You will have to set it to <code class="literal">FALSE</code> with
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-set-deletion-flag" title="gimp_unit_set_deletion_flag ()"><code class="function">gimp_unit_set_deletion_flag()</code></a> to make the unit definition persistent.</p>
<div class="refsect3">
<a name="gimp-unit-new.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>identifier</p></td>
<td class="parameter_description"><p>The unit's identifier string.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>factor</p></td>
<td class="parameter_description"><p>The unit's factor (how many units are in one inch).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>digits</p></td>
<td class="parameter_description"><p>The unit's suggested number of digits (see <a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-digits" title="gimp_unit_get_digits ()"><code class="function">gimp_unit_get_digits()</code></a>).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>symbol</p></td>
<td class="parameter_description"><p>The symbol of the unit (e.g. "''" for inch).</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>abbreviation</p></td>
<td class="parameter_description"><p>The abbreviation of the unit.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>singular</p></td>
<td class="parameter_description"><p>The singular form of the unit.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>plural</p></td>
<td class="parameter_description"><p>The plural form of the unit.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-unit-new.returns"></a><h4>Returns</h4>
<p> The ID of the new unit.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-get-deletion-flag"></a><h3>gimp_unit_get_deletion_flag ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
gimp_unit_get_deletion_flag (<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>);</pre>
<div class="refsect3">
<a name="gimp-unit-get-deletion-flag.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>The unit you want to know the <em class="parameter"><code>deletion_flag</code></em>
of.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-unit-get-deletion-flag.returns"></a><h4>Returns</h4>
<p> The unit's <em class="parameter"><code>deletion_flag</code></em>
.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-set-deletion-flag"></a><h3>gimp_unit_set_deletion_flag ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gimp_unit_set_deletion_flag (<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> deletion_flag</code></em>);</pre>
<p>Sets a <a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a>'s <em class="parameter"><code>deletion_flag</code></em>
. If the <em class="parameter"><code>deletion_flag</code></em>
of a unit is
<code class="literal">TRUE</code> when GIMP exits, this unit will not be saved in the users's
"unitrc" file.</p>
<p>Trying to change the <em class="parameter"><code>deletion_flag</code></em>
of a built-in unit will be silently
ignored.</p>
<div class="refsect3">
<a name="gimp-unit-set-deletion-flag.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>The unit you want to set the <em class="parameter"><code>deletion_flag</code></em>
for.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>deletion_flag</p></td>
<td class="parameter_description"><p>The new deletion_flag.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-get-factor"></a><h3>gimp_unit_get_factor ()</h3>
<pre class="programlisting"><span class="returnvalue">gdouble</span>
gimp_unit_get_factor (<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>);</pre>
<p>A <a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a>'s <em class="parameter"><code>factor</code></em>
is defined to be:</p>
<p>distance_in_units == (<em class="parameter"><code>factor</code></em>
* distance_in_inches)</p>
<p>Returns 0 for <em class="parameter"><code>unit</code></em>
== GIMP_UNIT_PIXEL.</p>
<div class="refsect3">
<a name="gimp-unit-get-factor.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>The unit you want to know the factor of.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-unit-get-factor.returns"></a><h4>Returns</h4>
<p> The unit's factor.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-get-digits"></a><h3>gimp_unit_get_digits ()</h3>
<pre class="programlisting"><span class="returnvalue">gint</span>
gimp_unit_get_digits (<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>);</pre>
<p>Returns the number of digits set for <em class="parameter"><code>unit</code></em>
.
Built-in units' accuracy is approximately the same as an inch with
two digits. User-defined units can suggest a different accuracy.</p>
<p>Note: the value is as-set by defaults or by the user and does not
necessary provide enough precision on high-resolution images.
When the information is needed for a specific image, the use of
<a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-scaled-digits" title="gimp_unit_get_scaled_digits ()"><code class="function">gimp_unit_get_scaled_digits()</code></a> may be more appropriate.</p>
<p>Returns 0 for <em class="parameter"><code>unit</code></em>
== GIMP_UNIT_PIXEL.</p>
<div class="refsect3">
<a name="gimp-unit-get-digits.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>The unit you want to know the digits.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-unit-get-digits.returns"></a><h4>Returns</h4>
<p> The suggested number of digits.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-get-scaled-digits"></a><h3>gimp_unit_get_scaled_digits ()</h3>
<pre class="programlisting"><span class="returnvalue">gint</span>
gimp_unit_get_scaled_digits (<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>,
<em class="parameter"><code><span class="type">gdouble</span> resolution</code></em>);</pre>
<p>Returns the number of digits a <em class="parameter"><code>unit</code></em>
field should provide to get
enough accuracy so that every pixel position shows a different
value from neighboring pixels.</p>
<p>Note: when needing digit accuracy to display a diagonal distance,
the <em class="parameter"><code>resolution</code></em>
may not correspond to the image's horizontal or
vertical resolution, but instead to the result of:
<code class="literal">distance_in_pixel / distance_in_inch</code>.</p>
<div class="refsect3">
<a name="gimp-unit-get-scaled-digits.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>The unit you want to know the digits.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>resolution</p></td>
<td class="parameter_description"><p>the resolution in PPI.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-unit-get-scaled-digits.returns"></a><h4>Returns</h4>
<p> The suggested number of digits.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-get-identifier"></a><h3>gimp_unit_get_identifier ()</h3>
<pre class="programlisting">const <span class="returnvalue">gchar</span> *
gimp_unit_get_identifier (<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>);</pre>
<p>This is an untranslated string and must not be changed or freed.</p>
<div class="refsect3">
<a name="gimp-unit-get-identifier.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>The unit you want to know the identifier of.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-unit-get-identifier.returns"></a><h4>Returns</h4>
<p> The unit's identifier.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-get-symbol"></a><h3>gimp_unit_get_symbol ()</h3>
<pre class="programlisting">const <span class="returnvalue">gchar</span> *
gimp_unit_get_symbol (<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>);</pre>
<p>This is e.g. "''" for UNIT_INCH.</p>
<p>NOTE: This string must not be changed or freed.</p>
<div class="refsect3">
<a name="gimp-unit-get-symbol.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>The unit you want to know the symbol of.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-unit-get-symbol.returns"></a><h4>Returns</h4>
<p> The unit's symbol.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-get-abbreviation"></a><h3>gimp_unit_get_abbreviation ()</h3>
<pre class="programlisting">const <span class="returnvalue">gchar</span> *
gimp_unit_get_abbreviation (<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>);</pre>
<p>For built-in units, this function returns the translated abbreviation
of the unit.</p>
<p>NOTE: This string must not be changed or freed.</p>
<div class="refsect3">
<a name="gimp-unit-get-abbreviation.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>The unit you want to know the abbreviation of.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-unit-get-abbreviation.returns"></a><h4>Returns</h4>
<p> The unit's abbreviation.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-get-singular"></a><h3>gimp_unit_get_singular ()</h3>
<pre class="programlisting">const <span class="returnvalue">gchar</span> *
gimp_unit_get_singular (<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>);</pre>
<p>For built-in units, this function returns the translated singular form
of the unit's name.</p>
<p>NOTE: This string must not be changed or freed.</p>
<div class="refsect3">
<a name="gimp-unit-get-singular.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>The unit you want to know the singular form of.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-unit-get-singular.returns"></a><h4>Returns</h4>
<p> The unit's singular form.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-get-plural"></a><h3>gimp_unit_get_plural ()</h3>
<pre class="programlisting">const <span class="returnvalue">gchar</span> *
gimp_unit_get_plural (<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>);</pre>
<p>For built-in units, this function returns the translated plural form
of the unit's name.</p>
<p>NOTE: This string must not be changed or freed.</p>
<div class="refsect3">
<a name="gimp-unit-get-plural.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>The unit you want to know the plural form of.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-unit-get-plural.returns"></a><h4>Returns</h4>
<p> The unit's plural form.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-format-string"></a><h3>gimp_unit_format_string ()</h3>
<pre class="programlisting"><span class="returnvalue">gchar</span> *
gimp_unit_format_string (<em class="parameter"><code>const <span class="type">gchar</span> *format</code></em>,
<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>);</pre>
<p>The <em class="parameter"><code>format</code></em>
string supports the following percent expansions:</p>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col>
<col>
</colgroup>
<tbody>
<tr>
<td>% f</td>
<td>Factor (how many units make up an inch)</td>
</tr>
<tr>
<td>% y</td>
<td>Symbol (e.g. "''" for GIMP_UNIT_INCH)</td>
</tr>
<tr>
<td>% a</td>
<td>Abbreviation</td>
</tr>
<tr>
<td>% s</td>
<td>Singular</td>
</tr>
<tr>
<td>% p</td>
<td>Plural</td>
</tr>
<tr>
<td>%%</td>
<td>Literal percent</td>
</tr>
</tbody>
</table></div>
<div class="refsect3">
<a name="gimp-unit-format-string.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>A printf-like format string which is used to create the unit
string.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>A unit.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-unit-format-string.returns"></a><h4>Returns</h4>
<p> A newly allocated string with above percent expressions
replaced with the resp. strings for <em class="parameter"><code>unit</code></em>
.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-8.html#api-index-2.8">2.8</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gimp-pixels-to-units"></a><h3>gimp_pixels_to_units ()</h3>
<pre class="programlisting"><span class="returnvalue">gdouble</span>
gimp_pixels_to_units (<em class="parameter"><code><span class="type">gdouble</span> pixels</code></em>,
<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>,
<em class="parameter"><code><span class="type">gdouble</span> resolution</code></em>);</pre>
<p>Converts a <em class="parameter"><code>value</code></em>
specified in pixels to <em class="parameter"><code>unit</code></em>
.</p>
<div class="refsect3">
<a name="gimp-pixels-to-units.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>pixels</p></td>
<td class="parameter_description"><p>value in pixels</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>unit to convert to</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>resolution</p></td>
<td class="parameter_description"><p>resolution in DPI</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-pixels-to-units.returns"></a><h4>Returns</h4>
<p> <em class="parameter"><code>pixels</code></em>
converted to units.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-8.html#api-index-2.8">2.8</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gimp-units-to-pixels"></a><h3>gimp_units_to_pixels ()</h3>
<pre class="programlisting"><span class="returnvalue">gdouble</span>
gimp_units_to_pixels (<em class="parameter"><code><span class="type">gdouble</span> value</code></em>,
<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>,
<em class="parameter"><code><span class="type">gdouble</span> resolution</code></em>);</pre>
<p>Converts a <em class="parameter"><code>value</code></em>
specified in <em class="parameter"><code>unit</code></em>
to pixels.</p>
<div class="refsect3">
<a name="gimp-units-to-pixels.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>value in units</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>unit of <em class="parameter"><code>value</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>resolution</p></td>
<td class="parameter_description"><p>resloution in DPI</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-units-to-pixels.returns"></a><h4>Returns</h4>
<p> <em class="parameter"><code>value</code></em>
converted to pixels.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-8.html#api-index-2.8">2.8</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gimp-units-to-points"></a><h3>gimp_units_to_points ()</h3>
<pre class="programlisting"><span class="returnvalue">gdouble</span>
gimp_units_to_points (<em class="parameter"><code><span class="type">gdouble</span> value</code></em>,
<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>,
<em class="parameter"><code><span class="type">gdouble</span> resolution</code></em>);</pre>
<p>Converts a <em class="parameter"><code>value</code></em>
specified in <em class="parameter"><code>unit</code></em>
to points.</p>
<div class="refsect3">
<a name="gimp-units-to-points.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>value</p></td>
<td class="parameter_description"><p>value in units</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>unit of <em class="parameter"><code>value</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>resolution</p></td>
<td class="parameter_description"><p>resloution in DPI</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-units-to-points.returns"></a><h4>Returns</h4>
<p> <em class="parameter"><code>value</code></em>
converted to points.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-8.html#api-index-2.8">2.8</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gimp-unit-is-metric"></a><h3>gimp_unit_is_metric ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
gimp_unit_is_metric (<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> unit</code></em>);</pre>
<p>Checks if the given <em class="parameter"><code>unit</code></em>
is metric. A simplistic test is used
that looks at the unit's factor and checks if it is 2.54 multiplied
by some common powers of 10. Currently it checks for mm, cm, dm, m.</p>
<p>See also: <a class="link" href="libgimpbase-gimpunit.html#gimp-unit-get-factor" title="gimp_unit_get_factor ()"><code class="function">gimp_unit_get_factor()</code></a></p>
<div class="refsect3">
<a name="gimp-unit-is-metric.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>unit</p></td>
<td class="parameter_description"><p>The unit</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-unit-is-metric.returns"></a><h4>Returns</h4>
<p> <code class="literal">TRUE</code> if the <em class="parameter"><code>unit</code></em>
is metric.</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-10.html#api-index-2.10">2.10</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GIMP-IS-PARAM-SPEC-UNIT:CAPS"></a><h3>GIMP_IS_PARAM_SPEC_UNIT()</h3>
<pre class="programlisting">#define GIMP_IS_PARAM_SPEC_UNIT(pspec) (G_TYPE_CHECK_INSTANCE_TYPE ((pspec), GIMP_TYPE_PARAM_UNIT))
</pre>
</div>
<hr>
<div class="refsect2">
<a name="gimp-param-spec-unit"></a><h3>gimp_param_spec_unit ()</h3>
<pre class="programlisting"><span class="returnvalue">GParamSpec</span> *
gimp_param_spec_unit (<em class="parameter"><code>const <span class="type">gchar</span> *name</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *nick</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *blurb</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> allow_pixels</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> allow_percent</code></em>,
<em class="parameter"><code><a class="link" href="libgimpbase-gimpunit.html#GimpUnit" title="enum GimpUnit"><span class="type">GimpUnit</span></a> default_value</code></em>,
<em class="parameter"><code><span class="type">GParamFlags</span> flags</code></em>);</pre>
<p>Creates a param spec to hold a units param.
See <code class="function">g_param_spec_internal()</code> for more information.</p>
<div class="refsect3">
<a name="gimp-param-spec-unit.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>name</p></td>
<td class="parameter_description"><p>Canonical name of the param</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>nick</p></td>
<td class="parameter_description"><p>Nickname of the param</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>blurb</p></td>
<td class="parameter_description"><p>Brief description of param.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>allow_pixels</p></td>
<td class="parameter_description"><p>Whether "pixels" is an allowed unit.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>allow_percent</p></td>
<td class="parameter_description"><p>Whether "percent" is an allowed unit.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>default_value</p></td>
<td class="parameter_description"><p>Unit to use if none is assigned.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>flags</p></td>
<td class="parameter_description"><p>a combination of <span class="type">GParamFlags</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gimp-param-spec-unit.returns"></a><h4>Returns</h4>
<p> a newly allocated <span class="type">GParamSpec</span> instance</p>
</div>
<p class="since">Since: <a class="link" href="api-index-2-4.html#api-index-2.4">2.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GIMP-VALUE-HOLDS-UNIT:CAPS"></a><h3>GIMP_VALUE_HOLDS_UNIT()</h3>
<pre class="programlisting">#define GIMP_VALUE_HOLDS_UNIT(value) (G_TYPE_CHECK_VALUE_TYPE ((value), GIMP_TYPE_UNIT))
</pre>
</div>
</div>
<div class="refsect1">
<a name="libgimpbase-gimpunit.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GimpUnit"></a><h3>enum GimpUnit</h3>
<p>Units used for dimensions in images.</p>
<div class="refsect3">
<a name="GimpUnit.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GIMP-UNIT-PIXEL:CAPS"></a>GIMP_UNIT_PIXEL</p></td>
<td class="enum_member_description">
<p>Pixels</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GIMP-UNIT-INCH:CAPS"></a>GIMP_UNIT_INCH</p></td>
<td class="enum_member_description">
<p>Inches</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GIMP-UNIT-MM:CAPS"></a>GIMP_UNIT_MM</p></td>
<td class="enum_member_description">
<p>Millimeters</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GIMP-UNIT-POINT:CAPS"></a>GIMP_UNIT_POINT</p></td>
<td class="enum_member_description">
<p>Points</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GIMP-UNIT-PICA:CAPS"></a>GIMP_UNIT_PICA</p></td>
<td class="enum_member_description">
<p>Picas</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GIMP-UNIT-END:CAPS"></a>GIMP_UNIT_END</p></td>
<td class="enum_member_description">
<p>Marker for end-of-builtin-units</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GIMP-UNIT-PERCENT:CAPS"></a>GIMP_UNIT_PERCENT</p></td>
<td class="enum_member_description">
<p>Pseudo-unit percent</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GIMP-TYPE-UNIT:CAPS"></a><h3>GIMP_TYPE_UNIT</h3>
<pre class="programlisting">#define GIMP_TYPE_UNIT (gimp_unit_get_type ())
</pre>
<p><a class="link" href="libgimpbase-gimpunit.html#GIMP-TYPE-UNIT:CAPS" title="GIMP_TYPE_UNIT"><span class="type">GIMP_TYPE_UNIT</span></a> is a <span class="type">GType</span> derived from <span class="type">G_TYPE_INT</span>.</p>
</div>
<hr>
<div class="refsect2">
<a name="GIMP-TYPE-PARAM-UNIT:CAPS"></a><h3>GIMP_TYPE_PARAM_UNIT</h3>
<pre class="programlisting">#define GIMP_TYPE_PARAM_UNIT (gimp_param_unit_get_type ())
</pre>
</div>
</div>
<div class="refsect1">
<a name="libgimpbase-gimpunit.see-also"></a><h2>See Also</h2>
<p><span class="type">GimpUnitMenu</span>, <span class="type">GimpSizeEntry</span>.</p>
</div>
</div>
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