void drawLine(u16 x0, u16 y0, u16 x1, u16 y1)
{
s16 steep, t;
s16 deltax, deltay, error;
s16 x, y;
s16 ystep;
// simple clipping is done in the drawPixel routine
/*
if (( x0 < 0) || (x0 > HRES)) return;
if (( x1 < 0) || (x1 > HRES)) return;
if (( y0 < 0) || (y0 > VRES)) return;
if (( y1 < 0) || (y1 > VRES)) return;
*/
steep = _abs_(y1 - y0) > _abs_(x1 - x0);
if (steep)
{ // swap x and y
t = x0; x0 = y0; y0 = t;
t = x1; x1 = y1; y1 = t;
}
if (x0 > x1)
{ // swap ends
t = x0; x0 = x1; x1 = t;
t = y0; y0 = y1; y1 = t;
}
deltax = x1 - x0;
deltay = _abs_(y1 - y0);
error = 0;
y = y0;
if (y0 < y1) ystep = 1; else ystep = -1;
for (x = x0; x < x1; x++)
{
if (steep)
drawPixel(y,x);
else
drawPixel(x,y);
error += deltay;
if ( (error<<1) >= deltax)
{
y += ystep;
error -= deltax;
}
}
}
////long osc3(cpoint p0, cpoint p, long pas) {
//// long dx = (p.x - p0.x); if (dx<0) dx = -dx;
//// dx = dx/pas - (int)(dx/pas);
//// long dy = (p.y - p0.y); if (dy<0) dy = -dy;
//// dy = dy/pas - (int)(dy/pas);
//// return (0.2 + max(dx,dy)) / 1.2;
////}
void osc4(_frac_ *res, cpoint *p0, cpoint *p, long pas) {
res->num = _max2_(_abs_(p->x - p0->x), _abs_(p->y - p0->y)) % pas;
res->den = pas;
}
