Small Graphics Library written in C, using only Linux syscalls.
Implements the following functions:
| Library Call | System Call(s) used |
|---|---|
| void init_graphics() | open, ioctl, mmap |
| void exit_graphics() | ioctl |
| void clear_screen() | write |
| char getkey() | select, read |
| void sleep_ms(long ms) | nanosleep |
| void draw_pixel(int x, int y, color_t color) | |
| void draw_rect(int x1, int y1, int width, int height, color_t c) | |
| void draw_circle(int x, int y, int r, color_t color) |
- void init_graphics()
- Opens graphics device and maps it into memory (requires direct access to the framebuffer)
- Disables keypress echo
- void exit_graphcs()
- Cleans up before program exits and restores keypress echo
- void clear_screen()
- Clears the terminal
- char getkey()
- Reads a single key input from the user using non-blocking select() call
- void sleep_ms(long ms)
- Used to make the program sleep between graphics being drawn
- void draw_pixel(int x, int y, color_t color)
- Sets the pixel at coordinate (x, y) to the specified color
- void draw_rect(int x1, int y1, int width, int height, color_t c)
- Using draw_pixel, makes a rectangle with corners (x1, y1), (x1+width,y1), (x1+width,y1+height), (x1, y1+height)
- void draw_circle(int x, int y, int r, color_t color)
- Uses the midpoint circle algorithm to draw a circle at (x, y) with radius r