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/* hilbert.c */
/* S1 stuff
#define PIFBUF ( *(struct IFBUF **) 0xf010 )
#define PSET 2
struct IFBUF
{
char ERR;
char COMMAND;
char COLOR;
char PLOTOPTION;
int LINESTYLE;
int X1;
int Y1;
int X2;
int Y2;
char BFFLAG;
};
end of S1 stuff */
/* L3 stuff */
#define PIFBUF ( (struct IFBUF *) 0xa1 )
#define PSET 1
struct IFBUF
{
char PLOTOPTION;
char junk1[0xa8-0xa2];
int X1;
int Y1;
int X2;
int Y2;
char junk2[0xf0-0xb0];
char ERR; /* this to BFFLAG are dummies to keep S1 code */
char COMMAND;
int LINESTYLE;
char BFFLAG;
char junk3[0x3ea-0xf5];
char COLOR;
};
#define H0 512 /* square size */
#define XOFFS 80 /* offset to centre square */
#define XNUM 15 /* scale 512 * 15/16 = 480 */
#define XDENOM 16
#define YNUM 25 /* scale 512 * 25/64 = 200 */
#define YDENOM 64 /* to give max height, dot ratio 480/200 = 2.4 */
int h, x, y;
main()
{
int i, x0, y0;
char color;
PIFBUF->PLOTOPTION = PSET;
PIFBUF->LINESTYLE = /* normal */
PIFBUF->COMMAND = /* ?? */
PIFBUF->BFFLAG = 0; /* not a box */
color = i = 0;
x0 = y0 = (h = H0)/2;
while ( h > 1 )
{
++i;
h = h/2;
if ( ++color > 7 )
color = 1;
gcolor( color );
x = x0 += h/2;
y = y0 += h/2;
glocate();
a( i );
}
}
a( i )
int i;
{
if ( --i >= 0 )
{
d( i ); x -= h; plot();
a( i ); y -= h; plot();
a( i ); x += h; plot();
b( i );
}
}
b( i )
int i;
{
if ( --i >= 0 )
{
c( i ); y += h; plot();
b( i ); x += h; plot();
b( i ); y -= h; plot();
a( i );
}
}
c( i )
int i;
{
if ( --i >= 0 )
{
b( i ); x += h; plot();
c( i ); y += h; plot();
c( i ); x -= h; plot();
d( i );
}
}
d( i )
int i;
{
if ( --i >= 0 )
{
a( i ); y -= h; plot();
d( i ); x -= h; plot();
d( i ); y += h; plot();
c( i );
}
}
glocate()
{
PIFBUF->X2 = x - x * (XDENOM - XNUM) / XDENOM + XOFFS;
PIFBUF->Y2 = (y * YNUM) / YDENOM;
}
/* S1 gcolor and plot
gcolor( color )
int color;
{
PIFBUF->COLOR = color;
}
plot()
{
PIFBUF->X1 = PIFBUF->X2;
PIFBUF->Y1 = PIFBUF->Y2;
glocate();
#asm
SWI2
FDB $4201 call LINEMA
#endasm
}
end S1 plot */
gcolor( color )
int color;
{
PIFBUF->COLOR = color | 0x10;
}
plot()
{
PIFBUF->X1 = PIFBUF->X2;
PIFBUF->Y1 = PIFBUF->Y2;
glocate();
#asm
JSR $D709
JSR $D79A
#endasm
}
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