掌機 - Game Boy - C/C++ - Line、Circle、Box

參考資訊：
https://bgb.bircd.org/
https://github.com/mrombout/gbdk_playground
http://gbdk.sourceforge.net/doc/html/book01.html

Drawing Functions

#define WHITE    0
#define LTGREY   1
#define DKGREY   2
#define BLACK    3

#define M_NOFILL 0
#define M_FILL   1

void gotogxy(UINT8 x, UINT8 y);
INT8 gprintf(char *fmt,...) NONBANKED;

void wrtchr(char chr);
void plot_point(UINT8 x, UINT8 y);
void line(UINT8 x1, UINT8 y1, UINT8 x2, UINT8 y2);
void plot(UINT8 x, UINT8 y, UINT8 colour, UINT8 mode);
void color(UINT8 forecolor, UINT8 backcolor, UINT8 mode);
void circle(UINT8 x, UINT8 y, UINT8 radius, UINT8 style);
void box(UINT8 x1, UINT8 y1, UINT8 x2, UINT8 y2, UINT8 style);

main.c

#include <gb/gb.h>
#include <gb/drawing.h>

void main(void)
{
    color(BLACK, WHITE, SOLID);

    plot_point(3, 4);
    line(40, 40, 50, 50);
    circle(100, 60, 30, M_FILL);
    box(120, 125, 125, 135, M_NOFILL);

    gotogxy(18, 15);
    gprintf("Hi");

    plot(1, 1, 3, SOLID);
}

需要注意的是，在All Points Addressable(APA)模式下，必須使用gprintf()取代printf()

完成