Labels

You can design styles which format label text using the following controls:

• Color
• Font
• Font size
• Bold
• Italic
• Label Location

Label Fonts

The Style Designer font drop‑downs present a gallery of fonts that Graphviz can render on your chosen operating system:

• Windows → The list is derived from the fonts installed on your PC, filtered to remove fonts known to be incompatible with Graphviz.
• macOS → A static list of fonts is provided from the lists worksheet.

When the Font Name drop‑down is selected for the first time, Graphviz generates a preview image of the letters Aa Bb Cc for each font.

These preview images are cached for future use. You may notice a slight delay the first time as the cache is built, but subsequent displays occur quickly.

An example Font Name gallery on Windows 11 appears as follows:

Selecting a Font

The currently selected font name is highlighted in the gallery.

When you choose a font (e.g., Comic Sans MS):

• The Font Name caption on the drop‑down changes to the selected font.
• An icon of the letter A in the font appears in the ribbon to the left of the Font Name.
• The font name is added as an attribute in the Format String.
• A new preview image is generated, showing the associated labels rendered in the chosen font.

For example:

Label Location

Text can be aligned relative to the borders of a shape or cluster. Alignment is available as follows via the alignment buttons:

Position	Node	Cluster
Top	✅	✅
Center	✅	✅
Bottom	✅	✅
Left		✅
Middle		✅
Right		✅