diff options
Diffstat (limited to 'src/toys/path-cairo.cpp')
| -rw-r--r-- | src/toys/path-cairo.cpp | 342 |
1 files changed, 342 insertions, 0 deletions
diff --git a/src/toys/path-cairo.cpp b/src/toys/path-cairo.cpp new file mode 100644 index 0000000..73c2a59 --- /dev/null +++ b/src/toys/path-cairo.cpp @@ -0,0 +1,342 @@ +#include <cairo.h> +#include <toys/path-cairo.h> +#include <toys/toy-framework-2.h> +#include <2geom/sbasis-to-bezier.h> +#include <2geom/utils.h> +#include <sstream> +#include <optional> + +using namespace Geom; + +void cairo_rectangle(cairo_t *cr, Rect const& r) { + cairo_rectangle(cr, r.left(), r.top(), r.width(), r.height()); +} + +void cairo_convex_hull(cairo_t *cr, ConvexHull const& ch) { + if(ch.empty()) return; + cairo_move_to(cr, ch[ch.size()-1]); + for(auto i : ch) { + cairo_line_to(cr, i); + } +} + +void cairo_curve(cairo_t *cr, Curve const& c) { + if(!cairo_has_current_point(cr)) + cairo_move_to(cr, c.initialPoint()); + + if(LineSegment const* line_segment = dynamic_cast<LineSegment const*>(&c)) { + cairo_line_to(cr, (*line_segment)[1][0], (*line_segment)[1][1]); + } + else if(QuadraticBezier const *quadratic_bezier = dynamic_cast<QuadraticBezier const*>(&c)) { + std::vector<Point> points = quadratic_bezier->controlPoints(); + Point b1 = points[0] + (2./3) * (points[1] - points[0]); + Point b2 = b1 + (1./3) * (points[2] - points[0]); + cairo_curve_to(cr, b1[0], b1[1], + b2[0], b2[1], + points[2][0], points[2][1]); + } + else if(CubicBezier const *cubic_bezier = dynamic_cast<CubicBezier const*>(&c)) { + std::vector<Point> points = cubic_bezier->controlPoints(); + cairo_curve_to(cr, points[1][0], points[1][1], points[2][0], points[2][1], points[3][0], points[3][1]); + } +// else if(EllipticalArc const *svg_elliptical_arc = dynamic_cast<EllipticalArc *>(c)) { +// //TODO: get at the innards and spit them out to cairo +// } + else { + //this case handles sbasis as well as all other curve types + Path sbasis_path = cubicbezierpath_from_sbasis(c.toSBasis(), 0.1); + + //recurse to convert the new path resulting from the sbasis to svgd + for(const auto & iter : sbasis_path) { + cairo_curve(cr, iter); + } + } +} + +void cairo_path(cairo_t *cr, Path const &p) { + cairo_move_to(cr, p.initialPoint()[0], p.initialPoint()[1]); + if(p.size() == 0) { // naked moveto + cairo_move_to(cr, p.finalPoint()+Point(8,0)); + cairo_line_to(cr, p.finalPoint()+Point(-8,0)); + cairo_move_to(cr, p.finalPoint()+Point(0,8)); + cairo_line_to(cr, p.finalPoint()+Point(0,-8)); + return; + } + + for(const auto & iter : p) { + cairo_curve(cr, iter); + } + if(p.closed()) + cairo_close_path(cr); +} + +void cairo_path_stitches(cairo_t *cr, Path const &p) { + Path::const_iterator iter; + for ( iter = p.begin() ; iter != p.end() ; ++iter ) { + Curve const &c=*iter; + if (dynamic_cast<Path::StitchSegment const *>(&c)) { + cairo_move_to(cr, c.initialPoint()[X], c.initialPoint()[Y]); + cairo_line_to(cr, c.finalPoint()[X], c.finalPoint()[Y]); + + std::stringstream s; + s << L1(c.finalPoint() - c.initialPoint()); + std::string ss = s.str(); + draw_text(cr, c.initialPoint()+Point(5,5), ss.c_str(), false, "Serif 6"); + + //std::cout << c.finalPoint() - c.initialPoint() << std::endl; + } + } +} + +void cairo_path_handles(cairo_t */*cr*/, Path const &/*p*/) { + //TODO +} + +void cairo_path(cairo_t *cr, PathVector const &p) { + PathVector::const_iterator it; + for(it = p.begin(); it != p.end(); ++it) { + cairo_path(cr, *it); + } +} + +void cairo_path_stitches(cairo_t *cr, PathVector const &p) { + PathVector::const_iterator it; + for ( it = p.begin() ; it != p.end() ; ++it ) { + cairo_path_stitches(cr, *it); + } +} + +void cairo_d2_sb(cairo_t *cr, D2<SBasis> const &B) { + cairo_path(cr, path_from_sbasis(B, 0.1)); +} + +void cairo_d2_sb2d(cairo_t* cr, D2<SBasis2d> const &sb2, Point /*dir*/, double width) { + D2<SBasis> B; + for(int ui = 0; ui <= 10; ui++) { + double u = ui/10.; + B[0] = extract_u(sb2[0], u);// + Linear(u); + B[1] = extract_u(sb2[1], u); + for(unsigned i = 0; i < 2; i ++) { + B[i] = B[i]*(width/2) + Linear(width/4); + } + cairo_d2_sb(cr, B); + } + for(int vi = 0; vi <= 10; vi++) { + double v = vi/10.; + B[1] = extract_v(sb2[1], v);// + Linear(v); + B[0] = extract_v(sb2[0], v); + for(unsigned i = 0; i < 2; i ++) { + B[i] = B[i]*(width/2) + Linear(width/4); + } + cairo_d2_sb(cr, B); + } +} + +void cairo_sb2d(cairo_t* cr, SBasis2d const &sb2, Point dir, double width) { + D2<SBasis> B; + for(int ui = 0; ui <= 10; ui++) { + double u = ui/10.; + B[0] = extract_u(sb2, u)*dir[0] + Linear(u); + B[1] = SBasis(Linear(0,1)) + extract_u(sb2, u)*dir[1]; + for(unsigned i = 0; i < 2; i ++) { + B[i] = B[i]*(width/2) + Linear(width/4); + } + cairo_d2_sb(cr, B); + } + for(int vi = 0; vi <= 10; vi++) { + double v = vi/10.; + B[1] = extract_v(sb2, v)*dir[1] + Linear(v); + B[0] = SBasis(Linear(0,1)) + extract_v(sb2, v)*dir[0]; + for(unsigned i = 0; i < 2; i ++) { + B[i] = B[i]*(width/2) + Linear(width/4); + } + cairo_d2_sb(cr, B); + } +} + +void cairo_d2_pw_sb(cairo_t *cr, D2<Piecewise<SBasis> > const &p) { + cairo_pw_d2_sb(cr, sectionize(p)); +} + +void cairo_pw_d2_sb(cairo_t *cr, Piecewise<D2<SBasis> > const &p) { + for(unsigned i = 0; i < p.size(); i++) + cairo_d2_sb(cr, p[i]); +} + + +void draw_line_seg(cairo_t *cr, Geom::Point a, Geom::Point b) { + cairo_move_to(cr, a[0], a[1]); + cairo_line_to(cr, b[0], b[1]); + cairo_stroke(cr); +} + +void draw_spot(cairo_t *cr, Geom::Point h) { + draw_line_seg(cr, h, h); +} + +void draw_handle(cairo_t *cr, Geom::Point h) { + double x = h[Geom::X]; + double y = h[Geom::Y]; + cairo_move_to(cr, x-3, y); + cairo_line_to(cr, x+3, y); + cairo_move_to(cr, x, y-3); + cairo_line_to(cr, x, y+3); +} + +void draw_cross(cairo_t *cr, Geom::Point h) { + double x = h[Geom::X]; + double y = h[Geom::Y]; + cairo_move_to(cr, x-3, y-3); + cairo_line_to(cr, x+3, y+3); + cairo_move_to(cr, x+3, y-3); + cairo_line_to(cr, x-3, y+3); +} + +void draw_circ(cairo_t *cr, Geom::Point h) { + int x = int(h[Geom::X]); + int y = int(h[Geom::Y]); + cairo_new_sub_path(cr); + cairo_arc(cr, x, y, 3, 0, M_PI*2); + cairo_stroke(cr); +} + +void draw_ray(cairo_t *cr, Geom::Point h, Geom::Point dir) { + draw_line_seg(cr, h, h+dir); + Point unit = 3*unit_vector(dir), + rot = rot90(unit); + draw_line_seg(cr, h+dir, h + dir - unit + rot); + draw_line_seg(cr, h+dir, h + dir - unit - rot); +} + + +void +cairo_move_to (cairo_t *cr, Geom::Point p1) { + cairo_move_to(cr, p1[0], p1[1]); +} + +void +cairo_line_to (cairo_t *cr, Geom::Point p1) { + cairo_line_to(cr, p1[0], p1[1]); +} + +void +cairo_curve_to (cairo_t *cr, Geom::Point p1, + Geom::Point p2, Geom::Point p3) { + cairo_curve_to(cr, p1[0], p1[1], + p2[0], p2[1], + p3[0], p3[1]); +} +/* + void draw_string(GtkWidget *widget, string s, int x, int y) { + PangoLayout *layout = gtk_widget_create_pango_layout(widget, s.c_str()); + cairo_t* cr = gdk_cairo_create (widget->window); + cairo_move_to(cr, x, y); + pango_cairo_show_layout(cr, layout); + cairo_destroy (cr); + }*/ + +// H in [0,360) +// S, V, R, G, B in [0,1] +void convertHSVtoRGB(const double H, const double S, const double V, + double& R, double& G, double& B) { + int Hi = int(floor(H/60.)) % 6; + double f = H/60. - Hi; + double p = V*(1-S); + double q = V*(1-f*S); + double t = V*(1-(1-f)*S); + switch(Hi) { + case 0: R=V, G=t, B=p; break; + case 1: R=q, G=V, B=p; break; + case 2: R=p, G=V, B=t; break; + case 3: R=p, G=q, B=V; break; + case 4: R=t, G=p, B=V; break; + case 5: R=V, G=p, B=q; break; + } +} + +void draw_line(cairo_t *cr, double a, double b, double c, const Geom::Rect& r) { + Geom::Line l(a, b, c); + std::optional<Geom::LineSegment> seg = l.clip(r); + if (seg) { + cairo_move_to(cr, seg->initialPoint()); + cairo_line_to(cr, seg->finalPoint()); + cairo_stroke(cr); + } +} + + +void draw_line(cairo_t* cr, const Geom::Line& l, const Geom::Rect& r) +{ + std::vector<double> coeff = l.coefficients(); + draw_line (cr, coeff[0], coeff[1], coeff[2], r); +} + + +void draw_line(cairo_t *cr, Geom::Point n, double dist, Geom::Rect r) { + draw_line(cr, n[0], n[1], dist, r); +} + + +void draw_ray(cairo_t *cr, const Geom::Ray& ray, const Geom::Rect& r) +{ + LineSegment ls; + + for (size_t i = 0; i < 4; ++i) + { + ls.setInitial (r.corner(i)); + ls.setFinal (r.corner(i+1)); + OptCrossing cx = intersection (ls, ray); + if (cx) + { + Point P = ray.pointAt ((*cx).tb); + draw_line_seg (cr, ray.origin(), P); + break; + } + } +} + +void draw_line_segment(cairo_t *cr, const Geom::LineSegment& ls, const Geom::Rect& r) +{ + if(r.contains(ls[0])) { + if(r.contains(ls[1])) { + draw_line_seg(cr, ls[0], ls[1]); + } else { + draw_ray(cr, Geom::Ray(ls[0], ls[1]), r); + } + + } else { + if(r.contains(ls[1])) { + draw_ray(cr, Geom::Ray(ls[1], ls[0]), r); + } else { + draw_line(cr, Geom::Line(ls[0], ls[1]), r); + } + + } +} + +void draw_line_seg_with_arrow(cairo_t *cr, Geom::Point a, Geom::Point b, double dangle, double radius) { + double angle = atan2(a-b); + cairo_move_to(cr, a); + cairo_line_to(cr, b); + + cairo_move_to(cr, b); + cairo_line_to(cr, Point::polar(angle + dangle, radius) + b); + cairo_move_to(cr, b); + cairo_line_to(cr, Point::polar(angle - dangle, radius) + b); + cairo_stroke(cr); +} + + + + +/* + Local Variables: + mode:c++ + c-file-style:"stroustrup" + c-file-offsets:((innamespace . 0)(substatement-open . 0)) + indent-tabs-mode:nil + c-brace-offset:0 + fill-column:99 + End: + vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 : +*/ |