FLTK icons

FLTK cheatsheets

FLTK icons • FLTK colors

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Icons

Modifiers

The @ sign may also be followed by the following optional "formatting" characters, in this order:

• '#' forces square scaling, rather than distortion to the widget's shape.

• +[1-9] or -[1-9] tweaks the scaling a little bigger or smaller.

• '$' flips the symbol horizontally, '%' flips it vertically.

• [0-9] - rotates by a multiple of 45 degrees. '5' and '6' do no rotation while the others point in the direction of that key on a numeric keypad. '0', followed by four more digits rotates the symbol by that amount in degrees.

Thus, to show a very large arrow pointing downward you would use the label string "@+92->".

Sources

src: https://www.fltk.org/doc-1.3/common.html#common_labels