bool
CIRCLE_WIDGET::create_literal(GESTUREptr gest)
{
PIXEL hit_start, hit_end;
Bpoint* b1 = Bpoint::hit_point(gest->start(), 8, hit_start);
Bpoint* b2 = Bpoint::hit_point(gest->end(), 8, hit_end);
// Find a plane to project the stroke into, but only
// accept planes that are sufficiently parallel to the
// film plane.
Wplane P = get_plane(b1, b2);
if (!P.is_valid()) {
b1 = b2 = 0;
// Ignoring the endpoints, try for a plane from the FLOOR
// or AxisWidget:
P = get_draw_plane(gest->pts());
if (!P.is_valid()) {
return false;
}
}
// Project pixel trail to the plane, and if the gesture
// is "closed", make the Wpt_list form a closed loop.
//DrawPen::project_to_plane(gest, P, _literal_shape);
_literal_shape.clear();
gest->pts().project_to_plane(P, _literal_shape);
if (gest->is_closed()) {
// If closed, remove the final few points to prevent jagginess
for (int i = _literal_shape.num()-1;i>=0;i--)
if (PIXEL(_literal_shape[0]).dist(PIXEL(_literal_shape[i])) < 15)
_literal_shape.remove(i);
else
break;
// add the first point as the last point
_literal_shape += _literal_shape[0];
_literal_shape.update_length();
}
return true;
}
int
SWEEP_DISK::stroke_cb(CGESTUREptr& g, DrawState*&)
{
bool debug = debug_all;
err_adv(debug, "SWEEP_DISK::stroke_cb");
// need non-const copy to fix endpoints
GESTUREptr gest = g;
// Activity occurred to extend the deadline for fading away:
reset_timeout();
// central axis must be on-screen
if (!sweep_origin().in_frustum()) {
err_adv(debug, "SWEEP_DISK::stroke_cb: error: sweep origin off-screen");
return 1;
}
// reject closed or self-intersecting strokes
if (gest->is_closed()) {
WORLD::message("Can't use closed stroke");
return 1;
}
if (gest->self_intersects()) {
WORLD::message("Can't use self-intersecting stroke");
return 1;
}
// Get the "silhouette" point on the boundary curve nearest
// the start of the stroke:
Wpt hit;
if (from_center(gest)) {
WORLD::message("Stroke from center of region must follow axis");
return 1;
}
// get the oversketch pixel_list
PIXEL_list profile_pixels;
bool is_line = false;
bool is_from_center = false;
if (!hit_boundary_at_sil(gest->start(), hit)) {
if (_profile.empty() || !Bcurve::splice_curves(gest->pts(), (PIXEL_list)_profile,
15.0, profile_pixels) ||
!hit_boundary_at_sil(profile_pixels.front(), hit)) {
WORLD::message("Stroke must start at a red dot or base of axis");
return false;
}
} else {
profile_pixels = gest->pts();
is_line = gest->is_line();
is_from_center = from_center(gest);
}
// If the stroke ends near the guideline, snap it to it:
bool cone_top = false;
if (hits_line(profile_pixels.back())) {
profile_pixels.fix_endpoints(profile_pixels.front(), pix_line().project(profile_pixels.back()));
cone_top = true;
}
// Don't let the stroke cross the guideline (but it can end at it)
bool its_bad = false;
if (cone_top)
its_bad = pts_in_range(profile_pixels, 0, profile_pixels.size()-2).
intersects_line(pix_line());
else its_bad = profile_pixels.intersects_line(pix_line());
if (its_bad) {
WORLD::message("Stroke cannot cross the dotted line");
return 1;
}
// A and B are line segments joining start and end of stroke
// (respectively) to the guideline, in screen space:
PIXELline A(pix_line().project(profile_pixels.front()), profile_pixels.front());
PIXELline B(pix_line().project(profile_pixels.back()), profile_pixels.back());
// Segment A has to be big enough to see what's going on
if (A.length() < DIST_THRESH_PIXELS) {
WORLD::message("Base curve is too small, zoom in to see better");
return 1;
}
// Stroke can't cross either line segment, because then the
// surface would be self-intersecting
its_bad = pts_in_range(profile_pixels, 1, profile_pixels.size()-1).intersects_seg(A);
its_bad = its_bad || (!cone_top &&
pts_in_range(profile_pixels, 0, profile_pixels.size()-2).intersects_seg(B));
if (its_bad) {
WORLD::message("Please - no self-intersecting surfaces");
return 1;
}
if (do_sweep(profile_pixels, hit, is_line, is_from_center)) {
// We're done -- start fading
reset_timeout(0.5);
} else {
err_adv(debug_all, "SWEEP_DISK::stroke_cb: error: do_sweep failed");
}
return 1;
}