3 Color Operations
A color can be represented in three ways: as a color index (an integer in 0 to 299, inclusive), as a color name string, or as a rgb value. All drawing functions which take a color argument accept colors in any form. An rgb value is assigned to an index with change-color.
| ||||||
| red : (real-in 0 1) | ||||||
| green : (real-in 0 1) | ||||||
| blue : (real-in 0 1) |
Takes three values in the range 0 (dark) to 1 (bright) and returns an
rgb (a color).
| (change-color index rgb) → void? |
| index : (integer-in 0 299) |
| rgb : rgb? |
Changes the color at index in the color table to the
color specified in rgb. Only the first twenty-one indices
are initialized; a color index should not be used until it has
been initialized.
Returns #t if the default display screen for viewports is in
color or #f otherwise.