graylib - z88dk/z88dk GitHub Wiki

Gray Library (gray.h)

| Header | {z88dk}/include/gray.h | | ----------------------------------------------------------------------------------------------------------------- | Source | {z88dk}/libsrc/graphics/gray | | Include | #include <gray.h> | | Linking | n/a | | Compile | n/a | | Supported | ZX81, TI calculators, Amstrad CPC |
| Comments | n/a |

The gray library is based on advanced IRQ handlers which quickly swap two display memory pages, thus it is subject to many limitations:

* In many cases the screen flickers (expecially on the ZX81)
* Keeping two pictures costs a lot of memory 
* It heavily slows down the CPU and makes it work continously, thus disabling the "power saving" tricks and sucking up batteries on the TI calculators
* Accessing to two display pages slows down the applications comparing to the "default" B/W graphics.

Constants

Gray Levels

G_BLACK 0
G_DARK 1
G_GRAY 2
G_LIGHT 2
G_WHITE 3

Functions

g_page(int page)

Select actual gray page for the standard gfx funtions

g_plot(int x, int y, int GrayLevel)

Plot a pixel on screen

g_point(int x, int y)

Get pixel status

g_draw(int x1, int y1, int x2, int y2, int GrayLevel)

Draw a line

g_drawr(int px, int py, int GrayLevel)

Relative draw

g_drawb(int tlx, int tly, int width, int height, int GrayLevel)

Draw a box

g_circle(int x, int y, int radius, int skip, int GrayLevel)

Draw a circle

g_clg(int GrayLevel)

Clear map

Notes

Recent changes integrate che gray functions in the core library file, so the following files will soon disappear:

cpcgray.lib
tigray82.lib
tigray83.lib
tigray83p.lib
tigray85.lib
tigray86.lib
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