1 files changed, 74 insertions, 0 deletions
diff --git a/src/toys/ellipse-bezier-intersect-toy.cpp b/src/toys/ellipse-bezier-intersect-toy.cpp
new file mode 100644
index 0000000..5468d97
--- /dev/null
+++ b/src/toys/ellipse-bezier-intersect-toy.cpp
@@ -0,0 +1,74 @@
+#include <2geom/cairo-path-sink.h>
+#include <2geom/ellipse.h>
+#include <2geom/line.h>
+#include <2geom/polynomial.h>
+#include <toys/toy-framework-2.h>
+
+using namespace Geom;
+
+class CircleIntersect : public Toy {
+    PointSetHandle eh, bh;
+
+    void draw(cairo_t *cr, std::ostringstream *notify, int width, int height, bool save, std::ostringstream *timer_stream) override {
+
+        Rect all(Point(0,0), Point(width, height));
+
+        double rx = Geom::distance(eh.pts[0], eh.pts[1]);
+        double ry = Geom::distance(eh.pts[0], eh.pts[2]);
+        double rot = Geom::atan2(eh.pts[1] - eh.pts[0]);
+
+        Ellipse e(eh.pts[0], Point(rx, ry), rot);
+        D2<Bezier> b(bh.pts);
+
+        cairo_set_line_width(cr, 1.0);
+        Geom::CairoPathSink cps(cr);
+
+        // draw Bezier control polygon
+        cairo_set_source_rgba(cr, 0, 0, 1, 0.3);
+        cps.moveTo(bh.pts[0]);
+        for (unsigned i = 1; i < bh.pts.size(); ++i) {
+            cps.lineTo(bh.pts[i]);
+        }
+        cairo_stroke(cr);
+
+        // draw Bezier curve and ellipse
+        cairo_set_source_rgb(cr, 0, 0, 0);
+        cps.feed(BezierCurve(b), true);
+        cps.feed(e);
+        cairo_stroke(cr);
+
+        std::vector<ShapeIntersection> result = e.intersect(b);
+
+        cairo_set_source_rgb(cr, 1, 0, 0);
+        for (auto & i : result) {
+            draw_handle(cr, i.point());
+        }
+        cairo_stroke(cr);
+
+        Toy::draw(cr, notify, width, height, save,timer_stream);
+    }
+
+    public:
+    CircleIntersect(){
+        eh.push_back(300,300); eh.push_back(450,150); eh.push_back(250, 350);
+        bh.push_back(100,100); bh.push_back(500,100); bh.push_back(100,500); bh.push_back(500,500);
+        handles.push_back(&eh);
+        handles.push_back(&bh);
+    }
+};
+
+int main(int argc, char **argv) {
+    init(argc, argv, new CircleIntersect());
+    return 0;
+}
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4:fileencoding=utf-8:textwidth=99 :