Instead of text labels, aiSee also offers the option of displaying icon files in nodes. The icon files have to be in PNG, PBM, PGM, or PPM (raw) format. They can be attached to summary nodes or ordinary nodes by using the iconfile attribute in subgraph or node specifications.
In order to prevent the title text from being drawn over the icon displayed,
the label attribute of the node or summary node can be set to the empty string,
i.e. label: "".
The search path for the icon files can be specified by the environment variable AISEEICONS.
Some additional graph attributes influence the drawing of icons, see icons, fast_icons and iconcolors.
When exporting graphs to SVG format, an iconfile
specification is translated into an <image> element.
The <image> element indicates to the SVG viewer used
that the contents of the icon file specified are to be rendered into a
given rectangle within the current user coordinate system. SVG viewers
usually support at least PNG, JPEG and SVG format icon files.
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