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| author | Michael R Sweet <michael.r.sweet@gmail.com> | 2002-04-11 10:46:19 +0000 |
|---|---|---|
| committer | Michael R Sweet <michael.r.sweet@gmail.com> | 2002-04-11 10:46:19 +0000 |
| commit | ef36be385e5bedc22f5e1da11b5eca4a55d3c0b5 (patch) | |
| tree | 4b8ba90bd67e80284d77f4cccdf697706cad9cb9 /documentation/enumerations.html | |
| parent | a9b5c825a4b86454fc1aedccb07dd91713ee8873 (diff) | |
Redefine FL_ color values to use the color cube.
Add FL_BACKGROUND_COLOR, FL_BACKGROUND2_COLOR, and FL_FOREGROUND_COLOR,
and use them instead of FL_GRAY, FL_WHITE, and FL_BLACK, respectively.
(FL_GRAY defined to FL_BACKGROUND_COLOR for back-compatibility)
Add fl_rgb_color(uchar g) inline method to map 8-bit grayscale to
24-bit RGB color.
Doco updates for all of this...
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@2072 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Diffstat (limited to 'documentation/enumerations.html')
| -rw-r--r-- | documentation/enumerations.html | 159 |
1 files changed, 111 insertions, 48 deletions
diff --git a/documentation/enumerations.html b/documentation/enumerations.html index 9651a9e22..8c6c98951 100644 --- a/documentation/enumerations.html +++ b/documentation/enumerations.html @@ -1,9 +1,11 @@ <HTML><BODY> <H1 ALIGN=RIGHT><A NAME=Enumerations>C - FLTK Enumerations</A></H1> - This appendix lists the enumerations provided in the <TT> -<FL/Enumerations.H></TT> header file, organized by section. -Constants whose value is zero are marked with "(0)", this is often -useful to know when programming. + +<P>This appendix lists the enumerations provided in the +<TT><FL/Enumerations.H></TT> header file, organized by +section. Constants whose value is zero are marked with "(0)", +this is often useful to know when programming. + <H2>Version Numbers</H2> The FLTK version number is stored in a number of compile-time constants: @@ -177,42 +179,93 @@ bold-oblique. </LI> </ul> <H2><a name=colors>Colors</A></H2> - The following color constants can be used to access the colors in the -FLTK standard color palette: + +<P>The <TT>Fl_Color</TT> enumeration type holds a FLTK color value. +Colors are either 8-bit indexes into a virtual colormap or 24-bit RGB +color values. Color indices occupy the lower 8 bits of the value, while +RGB colors occupy the upper 24 bits, for a byte organization of RGBI. + +<H3>Color Constants</H3> + +<P>Constants are defined for the user-defined foreground and background +colors, as well as specific colors and the start of the grayscale ramp +and color cube in the virtual colormap. Inline functions are provided to +retrieve specific grayscale, color cube, or RGB color values. + +<P>The following color constants can be used to access the user-defined +colors: + +<UL> + + <LI><TT>FL_BACKGROUND_COLOR</TT> - the default + background color</LI> + + <LI><TT>FL_BACKGROUND2_COLOR</TT> - the default + background color for text, list, and valuator widgets</LI> + + <LI><TT>FL_FOREGROUND_COLOR</TT> - the default + foreground color (0) used for labels and text</LI> + + <LI><TT>FL_INACTIVE_COLOR</TT> - the inactive foreground + color</LI> + + <LI><TT>FL_SELECTION_COLOR</TT> - the default selection/highlight + color</LI> + +</UL> + +<P>The following color constants can be used to access the colors from the +FLTK standard color cube: + <UL> -<LI><TT>FL_BLACK</TT> - the default label color (0)</LI> -<LI><TT>FL_RED</TT></LI> -<LI><TT>FL_GREEN</TT></LI> -<LI><TT>FL_YELLOW</TT></LI> -<LI><TT>FL_BLUE</TT></LI> -<LI><TT>FL_MAGENTA</TT></LI> -<LI><TT>FL_CYAN</TT></LI> -<LI><TT>FL_WHITE</TT> - the default background for text</LI> -<LI><TT>FL_SELECTION_COLOR</TT> - change to dark blue for Windows style</LI> -<LI><TT>FL_GRAY</TT> - the default color.</LI> + + <LI><TT>FL_BLACK</TT></LI> + <LI><TT>FL_RED</TT></LI> + <LI><TT>FL_GREEN</TT></LI> + <LI><TT>FL_YELLOW</TT></LI> + <LI><TT>FL_BLUE</TT></LI> + <LI><TT>FL_MAGENTA</TT></LI> + <LI><TT>FL_CYAN</TT></LI> + <LI><TT>FL_WHITE</TT></LI> + </UL> -In addition there are two inline functions to allow you to select -grays or colors from the FLTK colormap: +<P>The inline methods for getting a grayscale, color cube, or RGB color +value are described next. + +<H3>Color Functions</H3> + +<H4>Fl_Color fl_gray_ramp(int i)</H4> + +<P>Returns a gray color value from black (<TT>i == 0</TT>) to +white (<TT>i == FL_NUM_GRAY - 1</TT>). <TT>FL_NUM_GRAY</TT> is +defined to be 24 in the current FLTK release. To get the closest +FLTK gray value to an 8-bit grayscale color 'I' use: -<p><b>Fl_Color fl_gray_ramp(int i)</b> -<br>Returns a gray color. Returns black for zero, returns white for -<tt>FL_NUM_GRAY</tt> (which is 24) minus 1. To get the closest to an -8-bit gray value 'I' use -<tt>fl_gray_ramp(I*FL_NUM_GRAY/256)</tt> +<UL><PRE> +fl_gray_ramp(I * (FL_NUM_GRAY - 1) / 255) +</PRE></UL> -<p><b>Fl_Color fl_color_cube(int r, int g, int b)</b> -<br>Returns a color out of the color cube. +<H4>Fl_Color fl_color_cube(int r, int g, int b)</H4> +<P>Returns a color out of the color cube. <tt>r</tt> must be in the range 0 to FL_NUM_RED (5) minus 1. <tt>g</tt> must be in the range 0 to FL_NUM_GREEN (8) minus 1. <tt>b</tt> must be in the range 0 to FL_NUM_BLUE (5) minus 1. -To get the closest color to a 8-bit set of R,G,B values use -<tt>fl_color_cube(R*FL_NUM_RED/256, G*FL_NUM_GREEN/256, -B*FL_NUM_BLUE/256);</tt> +<P>To get the closest color to a 8-bit set of R,G,B values use: -<p><a name="fl_rgb_color"><b>Fl_Color fl_rgb_color(uchar r, uchar g, uchar b)</b></a> +<UL><PRE> +fl_color_cube(R * (FL_NUM_RED - 1) / 255, + G * (FL_NUM_GREEN - 1) / 255, + B * (FL_NUM_BLUE - 1) / 255); +</PRE></UL> + +<H4><a name="fl_rgb_color">Fl_Color fl_rgb_color(uchar r, uchar g, uchar b)<BR> +Fl_Color fl_rgb_color(uchar g)</a></H4> + +<P>Returns the 24-bit RGB color value for the specified 8-bit +RGB or grayscale values. <H2><a name=cursor>Cursors</A></H2> @@ -220,30 +273,40 @@ B*FL_NUM_BLUE/256);</tt> FLTK. The double-headed arrows are bitmaps provided by FLTK on X, the others are provided by system-defined cursors.</P> + <UL> -<LI><TT>FL_CURSOR_DEFAULT</TT> - the default cursor, usually an arrow (0)</LI> -<LI><TT>FL_CURSOR_ARROW</TT> - an arrow pointer </LI> -<LI><TT>FL_CURSOR_CROSS</TT> - crosshair </LI> -<LI><TT>FL_CURSOR_WAIT</TT> - watch or hourglass </LI> -<LI><TT>FL_CURSOR_INSERT</TT> - I-beam </LI> -<LI><TT>FL_CURSOR_HAND</TT> - hand (uparrow on MSWindows) </LI> -<LI><TT>FL_CURSOR_HELP</TT> - question mark </LI> -<LI><TT>FL_CURSOR_MOVE</TT> - 4-pointed arrow </LI> -<LI><TT>FL_CURSOR_NS</TT> - up/down arrow </LI> -<LI><TT>FL_CURSOR_WE</TT> - left/right arrow </LI> -<LI><TT>FL_CURSOR_NWSE</TT> - diagonal arrow </LI> -<LI><TT>FL_CURSOR_NESW</TT> - diagonal arrow </LI> -<LI><TT>FL_CURSOR_NONE</TT> - invisible </LI> + + <LI><TT>FL_CURSOR_DEFAULT</TT> - the default cursor, usually an arrow (0)</LI> + <LI><TT>FL_CURSOR_ARROW</TT> - an arrow pointer </LI> + <LI><TT>FL_CURSOR_CROSS</TT> - crosshair </LI> + <LI><TT>FL_CURSOR_WAIT</TT> - watch or hourglass </LI> + <LI><TT>FL_CURSOR_INSERT</TT> - I-beam </LI> + <LI><TT>FL_CURSOR_HAND</TT> - hand (uparrow on MSWindows) </LI> + <LI><TT>FL_CURSOR_HELP</TT> - question mark </LI> + <LI><TT>FL_CURSOR_MOVE</TT> - 4-pointed arrow </LI> + <LI><TT>FL_CURSOR_NS</TT> - up/down arrow </LI> + <LI><TT>FL_CURSOR_WE</TT> - left/right arrow </LI> + <LI><TT>FL_CURSOR_NWSE</TT> - diagonal arrow </LI> + <LI><TT>FL_CURSOR_NESW</TT> - diagonal arrow </LI> + <LI><TT>FL_CURSOR_NONE</TT> - invisible </LI> + </UL> + <H2>FD "When" Conditions</H2> + <UL> -<LI><TT>FL_READ</TT> - Call the callback when there is data to be - read. </LI> -<LI><TT>FL_WRITE</TT> - Call the callback when data can be written - without blocking. </LI> -<LI><TT>FL_EXCEPT</TT> - Call the callback if an exception occurs on - the file. </LI> + + <LI><TT>FL_READ</TT> - Call the callback when there is data to be + read.</LI> + + <LI><TT>FL_WRITE</TT> - Call the callback when data can be written + without blocking.</LI> + + <LI><TT>FL_EXCEPT</TT> - Call the callback if an exception occurs on + the file.</LI> + </UL> + <H2><a name=damage>Damage Masks</A></H2> The following damage mask bits are used by the standard FLTK widgets: <UL> |