| .COLOR Statement Details. |
|
 QuickSCREEN Details Example Contents Index |
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| COLOR Statement Details |
|
| Syntax |
| COLOR [foreground][,[background][,border]] Screen mode 0 |
| COLOR [background][,palette] Screen mode 1 |
| COLOR [foreground][,background] Screen modes 7-10 |
| COLOR [foreground] Screen modes 11-13 |
| |
| With the COLOR statement, you can set the foreground and background |
| colors for the display. In screen mode 0 a border color can also |
| be selected. In screen mode 1 no foreground color can be selected, |
| but one of two four-color palettes can be selected for use with |
| graphics statements. In screen modes 12-13 only the foreground color |
| can be set. |
| |
| The values of foreground in screen modes 7-10, 12, and 13 are |
| attribute numbers (not color numbers) and display the color |
| assigned to that attribute. See the PALETTE statement for a |
| description of attributes. |
| |
| The COLOR statement does not determine the range of available |
| colors. The combination of adapter, display, and the mode set by the |
| SCREEN statement determine the color range. See the SCREEN |
| statement for more information. |
| |
| The different syntaxes and their effects in different screen modes |
| are described below: |
| |
| Mode Description |
| |
| SCREEN 0 Modifies the current default text foreground and |
| background colors and the screen border. The |
| foreground color must be an integer expression in |
| the range 0-31. It determines the "foreground" |
| color in text mode-the default color of text. |
| Sixteen colors can be selected with the integers |
| 0-15. You can select a blinking version of a color |
| by adding 16 to the color number. For example |
| a blinking color 7 is equal to 7 + 16, or 23. |
| |
| The background color is an integer expression in |
| the range 0-7 and is the color of the background |
| for each text character. Blinking background colors |
| are not supported. |
| |
| The border color-the color used to draw the screen |
| border-is an integer expression in the range 0-15. |
| The IBM Enhanced Graphics Adapter (EGA), the IBM |
| Video Graphics Array adapter (VGA), and the IBM |
| Multicolor Graphics Array adapter (MCGA) do not |
| support the border argument. |
| |
| SCREEN 1 In mode 1, the COLOR statement has a unique syntax |
| that includes a palette argument that is an odd or |
| even integer expression in the range 0 to 255. This |
| argument determines which of two sets of colors to |
| use when displaying particular color numbers. |
| |
| The default colors for the palette parameter are |
| equivalent to the following PALETTE statements on |
| a system equipped with an EGA: |
| |
| COLOR ,0 'Same as the next three |
| 'PALETTE statements. |
| PALETTE 1,2 'Attribute 1 = color 2 (green) |
| PALETTE 2,4 'Attribute 2 = color 4 (red) |
| PALETTE 3,6 'Attribute 3 = color 6 (yellow) |
| |
| COLOR ,1 'Same as the next three |
| 'PALETTE statements. |
| PALETTE 1,3 'Attribute 1 = color 3 (cyan) |
| PALETTE 2,5 'Attribute 2 = color 5 (magenta) |
| PALETTE 3,7 'Attribute 3 = color 7 (white) |
| |
| Note that in screen mode 1, a COLOR statement |
| overrides previous PALETTE statements. |
| |
| SCREEN 2 An "Illegal function call" message results if COLOR |
| is used in this mode. |
| |
| SCREEN 7, In these modes, no border color can be specified. |
| 8, the graphics background is given by the background |
| 9, color number, which must be in the range of valid |
| 10 color numbers for the screen mode. The foreground |
| color argument is the default line-drawing color. |
| In screen modes 7 to 10 foreground is an attribute |
| number, while background is a color number. See the |
| SCREEN statement for more details. |
| |
| SCREEN 11 Use the PALETTE statement to set color in screen |
| mode 11. An "Illegal function call" message results if |
| COLOR is used in this mode. |
| |
| SCREEN 12, No background color can be specified in these modes. |
| 13 The foreground argument is the attribute used for |
| the foreground graphics color. The attribute must |
| be in the correct range for the screen mode. See |
| the SCREEN statement for more information. |
| |
| Arguments outside the valid ranges produce error messages that read |
| "Illegal function call." |
| |
| The foreground can be the same color as the background, making |
| displayed characters invisible. The default background is black, or |
| color number 0 for all display hardware configurations and all screen |
| modes. |
| |
| In screen modes 12 and 13 you can set the background color by |
| assigning a color to attribute 0 with a PALETTE statement. For |
| example, to make the background color 8224 (a light violet), you would |
| use the following PALETTE statement: |
| |
| PALETTE 0,8224 |
| |
| In screen mode 11 you can set both the foreground and background color |
| by assigning a color to attribute 0 with a PALETTE statement. |
| |
| With an EGA, VGA, or MCGA installed, the PALETTE statement gives you |
| flexibility in assigning different display colors to the actual |
| color-number ranges for the foreground, background, and border colors |
| discussed above. See the PALETTE statement for more details. |
