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300 lines
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<title>ImageMagick: MagickCore, C API for ImageMagick: Annotate an Image</title>
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<p class="text-center"><a href="annotate.html#AnnotateImage">AnnotateImage</a> • <a href="annotate.html#FormatMagickCaption">FormatMagickCaption</a> • <a href="annotate.html#GetMultilineTypeMetrics">GetMultilineTypeMetrics</a> • <a href="annotate.html#GetTypeMetrics">GetTypeMetrics</a></p>
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<h2><a href="http://www.imagemagick.org/api/MagickCore/annotate_8c.html" id="AnnotateImage">AnnotateImage</a></h2>
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<p>AnnotateImage() annotates an image with text. Optionally you can include any of the following bits of information about the image by embedding the appropriate special characters:</p>
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<pre class="text">
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\n newline
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\r carriage return
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< less-than character.
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> greater-than character.
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& ampersand character.
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a percent sign
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b file size of image read in
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c comment meta-data property
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d directory component of path
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e filename extension or suffix
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f filename (including suffix)
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g layer canvas page geometry (equivalent to "WxHXY")
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h current image height in pixels
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i image filename (note: becomes output filename for "info:")
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k CALCULATED: number of unique colors
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l label meta-data property
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m image file format (file magic)
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n number of images in current image sequence
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o output filename (used for delegates)
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p index of image in current image list
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q quantum depth (compile-time constant)
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r image class and colorspace
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s scene number (from input unless re-assigned)
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t filename without directory or extension (suffix)
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u unique temporary filename (used for delegates)
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w current width in pixels
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x x resolution (density)
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y y resolution (density)
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z image depth (as read in unless modified, image save depth)
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A image transparency channel enabled (true/false)
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C image compression type
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D image GIF dispose method
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G original image size (wxh; before any resizes)
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H page (canvas) height
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M Magick filename (original file exactly as given, including read mods)
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O page (canvas) offset ( = XY )
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P page (canvas) size ( = WxH )
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Q image compression quality ( 0 = default )
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S ?? scenes ??
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T image time delay (in centi-seconds)
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U image resolution units
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W page (canvas) width
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X page (canvas) x offset (including sign)
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Y page (canvas) y offset (including sign)
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Z unique filename (used for delegates)
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@ CALCULATED: trim bounding box (without actually trimming)
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# CALCULATED: 'signature' hash of image values
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</pre>
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<p>The format of the AnnotateImage method is:</p>
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<pre class="text">
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MagickBooleanType AnnotateImage(Image *image,DrawInfo *draw_info,
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ExceptionInfo *exception)
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</pre>
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<p>A description of each parameter follows:</p>
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<dd>
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</dd>
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<dd> </dd>
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<dl class="dl-horizontal">
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<dt>image</dt>
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<dd>the image. </dd>
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<dd> </dd>
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<dt>draw_info</dt>
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<dd>the draw info. </dd>
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<dd> </dd>
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<dt>exception</dt>
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<dd>return any errors or warnings in this structure. </dd>
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<dd> </dd>
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</dl>
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<h2><a href="http://www.imagemagick.org/api/MagickCore/annotate_8c.html" id="FormatMagickCaption">FormatMagickCaption</a></h2>
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<p>FormatMagickCaption() formats a caption so that it fits within the image width. It returns the number of lines in the formatted caption.</p>
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<p>The format of the FormatMagickCaption method is:</p>
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<pre class="text">
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ssize_t FormatMagickCaption(Image *image,DrawInfo *draw_info,
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const MagickBooleanType split,TypeMetric *metrics,char **caption,
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ExceptionInfo *exception)
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</pre>
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<p>A description of each parameter follows.</p>
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<dt>image</dt>
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<p>The image.</p>
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<dt>draw_info</dt>
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<p>the draw info.</p>
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<dt>split</dt>
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<p>when no convenient line breaks-- insert newline.</p>
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<dt>metrics</dt>
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<p>Return the font metrics in this structure.</p>
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<dt>caption</dt>
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<p>the caption.</p>
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<dt>exception</dt>
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<p>return any errors or warnings in this structure.</p>
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<h2><a href="http://www.imagemagick.org/api/MagickCore/annotate_8c.html" id="GetMultilineTypeMetrics">GetMultilineTypeMetrics</a></h2>
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<p>GetMultilineTypeMetrics() returns the following information for the specified font and text:</p>
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<pre class="text">
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character width
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character height
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ascender
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descender
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text width
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text height
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maximum horizontal advance
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bounds: x1
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bounds: y1
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bounds: x2
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bounds: y2
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origin: x
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origin: y
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underline position
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underline thickness
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</pre>
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<p>This method is like GetTypeMetrics() but it returns the maximum text width and height for multiple lines of text.</p>
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<p>The format of the GetMultilineTypeMetrics method is:</p>
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<pre class="text">
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MagickBooleanType GetMultilineTypeMetrics(Image *image,
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const DrawInfo *draw_info,TypeMetric *metrics,ExceptionInfo *exception)
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</pre>
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<p>A description of each parameter follows:</p>
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<dd>
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</dd>
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<dd> </dd>
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<dl class="dl-horizontal">
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<dt>image</dt>
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<dd>the image. </dd>
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<dd> </dd>
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<dt>draw_info</dt>
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<dd>the draw info. </dd>
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<dd> </dd>
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<dt>metrics</dt>
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<dd>Return the font metrics in this structure. </dd>
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<dd> </dd>
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<dt>exception</dt>
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<dd>return any errors or warnings in this structure. </dd>
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<dd> </dd>
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</dl>
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<h2><a href="http://www.imagemagick.org/api/MagickCore/annotate_8c.html" id="GetTypeMetrics">GetTypeMetrics</a></h2>
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<p>GetTypeMetrics() returns the following information for the specified font and text:</p>
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<pre class="text">
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character width
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character height
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ascender
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descender
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text width
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text height
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maximum horizontal advance
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bounds: x1
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bounds: y1
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bounds: x2
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bounds: y2
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origin: x
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origin: y
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underline position
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underline thickness
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</pre>
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<p>The format of the GetTypeMetrics method is:</p>
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<pre class="text">
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MagickBooleanType GetTypeMetrics(Image *image,const DrawInfo *draw_info,
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TypeMetric *metrics,ExceptionInfo *exception)
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</pre>
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<p>A description of each parameter follows:</p>
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<dd>
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</dd>
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<dd> </dd>
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<dl class="dl-horizontal">
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<dt>image</dt>
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<dd>the image. </dd>
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<dd> </dd>
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<dt>draw_info</dt>
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<dd>the draw info. </dd>
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<dd> </dd>
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<dt>metrics</dt>
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<dd>Return the font metrics in this structure. </dd>
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<dd> </dd>
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<dt>exception</dt>
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<dd>return any errors or warnings in this structure. </dd>
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<dd> </dd>
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</dl>
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