Added some glossary items.
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William Kendrick
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2 changed files with 64 additions and 20 deletions
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@ -6,7 +6,7 @@
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bill@newbreedsoftware.com
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http://www.tuxpaint.org/
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July 5, 2007 - August 7, 2007
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July 5, 2007 - August 23, 2007
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--------------------------------------------------------------------------
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@ -896,6 +896,14 @@ Glossary
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to a struct.
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* backquote: See "grave."
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* backtick: See "grave."
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* bit: "Binary digit." Bits are the basic storage unit in a computer's
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memory, disk, networking, etc. They represent either 0 or 1. (Compared
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to a decimal digit, which can be anything between 0 and 9.) Just as a
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series of decimal digits can represent a larger number (e.g., "1" and
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"5" is fifteen (15)), so can bits (e.g., "1" and "0", is two). In
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decimal, we go from right to left: ones place, tens place, hundreds
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place, thousands place, etc. In binary, it is: ones place, twos place,
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fours place, eights place, etc. (See also "byte.")
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* blue: See "RGBA"
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* boolean 'or': A mathematical operation that results in a true value if
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either operand is true. ("1 | 0", "0 | 1" and "1 | 1" all result in
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@ -906,20 +914,30 @@ Glossary
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* *: See "star"
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* byte: A unit of memory made up of 8 bits. As a signed value, it can
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represent -128 through 127. As an unsigned value, it can represent 0
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through 255.
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through 255. As a series of bits, for example, the byte "00001100"
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represents the decimal value 12.
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* callback: TBD
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* C enumeration: TBD
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* C enumeration: A construct in C that allows you to label numeric
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values (usually starting at 0 and incrementing by one). (e.g., "enum {
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ONE, TWO, THREE };"
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* C function: TBD
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* C header file: TBD
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* channel: TBD
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* click: The action of pressing a button on a mouse.
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* coordinates: TBD
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* coordinates: A set of numbers corresponding to a physical position;
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for example, in a two-dimensional (2D) image, "X" and "Y" coordinates
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specify the position across (left-to-right) and down the image,
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respectively. In SDL, the coordinates (0,0) is the top-leftmost pixel
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of a surface.
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* C pointer: A variable that contains the location of a piece of memory;
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usually used to 'point' to another variable. Since C functions can
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only return one value as a result, pointers are often sent to
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functions to allow the function to change the values of multiple
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variables. (For example, Tux Paint's "rgbtohsv()" and "hsvtorgb()".)
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* C structure: TBD
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* C structure: A construct in C that allows you to declare a new
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variable 'type' which may contain other types within. For example,
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SDL's "SDL_Rect" contains four integer values, the coordinates of the
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rectangle (X,Y), and its dimensions (width and height).
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* #define: A C statement that defines a substitution that can occur
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later in the code. Generally used for constant values (e.g.,
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"#define RADIUS 16"; all instances of "RADIUS" will be replaced with
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@ -953,7 +971,7 @@ Glossary
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* .h: See "C header file"
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* header: See "C header file"
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* header file: See "C header file"
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* HSV: TBD
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* HSV: Hue, Saturation and Value. TBD
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* hue: See "HSV"
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* IMG_Load(): An SDL_image function that loads an image file (e.g., a
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PNG) and returns it as an "SDL_Surface *".
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@ -963,7 +981,11 @@ Glossary
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* integer: TBD
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* libSDL: See "Simple DirectMedia Layer"
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* linear: TBD
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* macro: TBD
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* macro: A C construct that looks similar to a C function, but is simply
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a #define that is expanded 'inline'. For example, if you declared the
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macro "#define ADD(A,B) ((A)+(B))", and then used it with "c =
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ADD(1,2);", that line of code would literally expand to "c = ((1) +
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(2));", or more simply, "c = 1 + 2;".
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* magic_api: A C structure that is passed along to a plugin's functions
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that exposes data and functions within the running copy of Tux Paint.
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* make: A utility that automatically determines which pieces of a larger
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@ -1030,7 +1052,14 @@ Glossary
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* Simple DirectMedia Layer: A programming library that allows programs
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portable low level access to a video framebuffer, audio output, mouse,
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and keyboard. (See also: http://www.libsdl.org/)
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* snprintf(): TBD (See also the "snprintf(3)" man page)
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* snprintf(): A C function, related to "printf()", which takes a
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'format' string and one or more additional arguments, and puts them
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together. "snprintf()" takes the resulting output and stores it into a
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string, making sure not to go beyond the string's buffer size (which
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must also be supplied). For example, assume a string "char str[20];"
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has been declared; "snprintf(str, 20, "Name: %s, Age: %d", "Bill",
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"32");" will store "Name: Bill, Age: 32" into 'str'. (See also the
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"snprintf(3)" man page)
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* .so: See "Shared Object"
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* sRBG: See "RGBA"
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* star: "*". A symbol in C that, when used in the declaration of
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@ -1059,9 +1088,23 @@ Glossary
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representing a pixel's color; i.e., RBGA value).
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* Uint8: An 8-bit, unsigned integer (defined by libSDL). In other words,
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a byte that can represent 0 through 255.
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* unsigned: TBD
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* unsigned: In C, a variable that can store a numeric value can be
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declared as either "signed" (the default), or "unsigned". In the
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former case, one bit of the value is used to denote the sign of the
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value (either positive or negative). In the latter case, the value can
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only be positive, but benefits from one extra bit of storage for the
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number. A signed byte (8 bits), for example, can represent any number
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between -128 and 127. An unsigned byte can go up to 255, but it cannot
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go below 0. For the purposes of graphics in SDL, unsigned values
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should be used for RGB values, since each channel (red, green and
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blue) may be between 0 (off) and 255 (brightest).
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* value: See "HSV"
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* variable: TBD
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* variable: A construct in computer programming that contains a value
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which can be referenced again later by referring to the variable's
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name, and typically changed later. For example, a variable to hold
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someone's age could be declared as an integer: "int a;". It can be
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examined later: "if (a >= 18) { /* they are an adult */ } else { /*
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they are not an adult */ }".
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* WAV: TBD (See also "Ogg Vorbis")
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* (w,h): See "Dimensions"
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* (x,y): See "Coordinates"
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