A color is an object representing a red-green-blue (RGB) combination
of primary colors, and is used to determine drawing colors. Each red,
green, or blue component of the color is in the range 0 to 255,
inclusive. For example, (0, 0, 0) is black, (255, 255, 255) is
white, and (255, 0, 0) is red.
See color-database<%> for information about obtaining a color object using a color name.
| (make-object color%) → (is-a?/c color%) |
| (make-object color% red green blue) → (is-a?/c color%) |
| red : (integer-in 0 255) |
| green : (integer-in 0 255) |
| blue : (integer-in 0 255) |
| (make-object color% color-name) → (is-a?/c color%) |
| color-name : string? |
Creates a new color with the given RGB values, or matching the given
color name (using “black” if no color is given or if the name is
not recognized). See color-database<%> for more information
on color names.
| (send a-color blue) → (integer-in 0 255) |
Returns the blue component of the color.
Copies the RGB values of another color object to this one, returning
this object as the result.
| (send a-color green) → (integer-in 0 255) |
Returns the green component of the color.
Returns #t if the color object is valid.
| (send a-color red) → (integer-in 0 255) |
Returns the red component of the color.
| (send a-color set red green blue) → void? |
| red : (integer-in 0 255) |
| green : (integer-in 0 255) |
| blue : (integer-in 0 255) |
Sets the three (red, green, and blue) component values of the color.