bool
Segment(Canvas &canvas, int x, int y, unsigned radius,
Angle start, Angle end, bool horizon)
{
// dont draw if out of view
if (!IsCircleVisible(canvas, x, y, radius))
return false;
const int istart = NATIVE_TO_INT(start.Native());
const int iend = NATIVE_TO_INT(end.Native());
unsigned npoly = 0;
RasterPoint pt[67];
// add center point
if (!horizon) {
pt[0].x = x;
pt[0].y = y;
npoly = 1;
}
segment_poly(pt, x, y, radius, istart, iend, npoly);
assert(npoly <= ARRAY_SIZE(pt));
if (npoly)
canvas.DrawTriangleFan(pt, npoly);
return true;
}
bool
KeyHole(Canvas &canvas, int x, int y, unsigned radius,
Angle start, Angle end, unsigned inner_radius)
{
// dont draw if out of view
if (!IsCircleVisible(canvas, x, y, radius))
return false;
const int istart = NATIVE_TO_INT(start.Native());
const int iend = NATIVE_TO_INT(end.Native());
unsigned npoly = 0;
RasterPoint pt[66*2];
segment_poly(pt, x, y, radius, istart, iend, npoly);
segment_poly(pt, x, y, inner_radius, iend, istart, npoly);
assert(npoly < ARRAY_SIZE(pt));
if (npoly)
canvas.DrawPolygon(pt, npoly);
return true;
}
bool
Annulus(Canvas &canvas, PixelPoint center, unsigned radius,
Angle start, Angle end, unsigned inner_radius)
{
// dont draw if out of view
if (!IsCircleVisible(canvas, center, radius))
return false;
const int istart = NATIVE_TO_INT(start.Native());
const int iend = NATIVE_TO_INT(end.Native());
unsigned npoly = 0;
BulkPixelPoint pt[66*2];
segment_poly(pt, center, radius, istart, iend, npoly);
segment_poly(pt, center, inner_radius, iend, istart, npoly, false);
assert(npoly <= ARRAY_SIZE(pt));
if (npoly)
canvas.DrawPolygon(pt, npoly);
return true;
}
