void mandelPixel(int x, int y) {
long r0,i0,rn, p,q;
long rs,is;
int iteration;
rs=(mandel.rmax-mandel.rmin)/RESY;
is=(mandel.imax-mandel.imin)/RESX;
//p=fixpt(mandel.rmin+y*rs);
//q=fixpt(mandel.imin+x*is);
p=mandel.rmin+y*rs;
q=mandel.imin+x*is;
rn=0;
r0=0;
i0=0;
iteration=0;
while ((mul(rn,rn)+mul(i0,i0))<fixpt(4) && ++iteration<ITERATION_MAX) {
rn=mul((r0+i0),(r0-i0)) +p;
i0=mul(fixpt(2),mul(r0,i0)) +q;
r0=rn;
}
if (iteration==ITERATION_MAX) iteration=ITERATION_MAX;
bool pixel = ( iteration>1);
lcdSetPixel(x, y, 255-iteration*2);
}
// calculate the current mandelbrot set
static void calculate_mandel()
{
const GR_COLOR * the_palette = GRAY_palette;
const int sx = screen_width;
const int sy = screen_height;
const int iter = iterations-1;
const double xmin=xMin;
const double ymin=yMin;
const double xmax=xMax;
const double ymax=yMax;
const double xs=(xmax-xmin)/sx;
const double ys=(ymax-ymin)/sy;
register long x0,y0,p,q,xn,tot;
register int i=0,x=0,y=0;
const int depth = current_depth;
if( screen_info.bpp == 16 )
the_palette = color_palette;
rendering=1;
show_cursor=0;
active_renderer++;
// start main loop
for (y=0;y<sy;y++) {
for (x=0;x<sx;x++) {
p=fixpt(xmin+x*xs);
q=fixpt(ymin+y*ys);
xn=0;
x0=0;
y0=0;
i=0;
while ((mul(xn,xn)+mul(y0,y0))<fixpt(4) && ++i<iter) {
xn=mul((x0+y0),(x0-y0)) +p;
y0=mul(fixpt(2),mul(x0,y0)) +q;
x0=xn;
}
tot+=i;
GrSetGCForeground(mandel_gc, the_palette[i%8]);
GrPoint(level[depth].mandel_buffer, mandel_gc,x,y);
}
// for every line only:
// check if we had an event
check_event();
// check if we need to quit
if (!rendering) return;
// update the screen
draw_mandel();
}
// end main loop
active_renderer--;
}
void mandelInit() {
//mandel.rmin = -2.2*0.9;
//mandel.rmax = 1.0*0.9;
//mandel.imin = -2.0*0.9;
//mandel.imax = 2.0*0.9;
mandel.rmin = fixpt(-2);
mandel.rmax = fixpt(1);
mandel.imin = fixpt(-2);
mandel.imax = fixpt(2);
mandel.presscount = 0;
mandel.presslimitzin = 15;
mandel.presslimitzout = 5;
mandel.zoomlevel = 0;
mandel.maxzoomin = 42;
mandel.maxzoomout = -12;
mandel.dirty = true;
mandel.dup = false;
mandel.ddown = false;
mandel.dleft = false;
mandel.dright = false;
mandel.clickmark = false;
}