Expert C Programming Chapter 8 Why Programmers Can't Tell the Difference Between Halloween and Christmas 8.2 Building Graphics from Bit Patterns

Building Graphics from Bit Patterns
An icon or glyph is an image that is produced by mapping a small bit pattern to the screen.A bit represents a pixel on an image.If a bit is set, the pixel it represents is "bright", and if a bit is cleared, the pixel it represents is "dark".So a series of integer values ​​can be used to encode graphics.Tools like Iconedit are used to draw graphics.The file they output is an ASCII file containing a series of integers that can be included by a windowing program.The problem with it is that the icon in the program is just a string of hexadecimal numbers.In C, a typical 16*16 black and white graphic might look like this:
static unsigned short stopwatch[] = {
0x07C6,
0x1FF7,
0x383B,
0x600C,
0x600C,
0xC006,
0xDF06,
0xC106,
0xC106,
0x610C,
0x610C,
0x3838,
0x1FF0,
0x0700,
0x0000any clues.Here's an amazingly elegant collection of #defines that allow programs to build constants that look like graphics on the screen.
#define X )*2+1
#define - )*2
#define s ((((((((((((((((0 /* used to create 16 bits)Wide graphics*/
After they are defined, the program will automatically create their hexadecimal mode as long as the required icons or graphics are drawn.
Using these macro definitions, the word description ability of the program is greatly enhanced, the above example can be transformed into:
static unsigned short stopwatch[] = {
    
} 
与前面的代码相比，它的意思更为明显。

Standard C has octal, decimal, and hexadecimal constants, but no binary constants, otherwise an easier way to draw graphics bit patterns.
Don't forget to clear these macro definitions after drawing, otherwise it may have unpredictable consequences for your code behind.