Show discrete/toggled automation as stepped line.

2 files changed, 26 insertions, 0 deletions

diff --git a/libs/canvas/canvas/poly_line.h b/libs/canvas/canvas/poly_line.h
index 16db9a69e2..04b05f5df1 100644
--- a/libs/canvas/canvas/poly_line.h
+++ b/libs/canvas/canvas/poly_line.h
@@ -33,6 +33,8 @@ class LIBCANVAS_API PolyLine : public PolyItem
 	PolyLine (Item*);
 	
 	void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
+
+	virtual void set_steps (Points const &, bool stepped);
 	
         bool covers (Duple const &) const;
 	/**
diff --git a/libs/canvas/poly_line.cc b/libs/canvas/poly_line.cc
index 60bca6bccf..3150907db6 100644
--- a/libs/canvas/poly_line.cc
+++ b/libs/canvas/poly_line.cc
@@ -47,6 +47,30 @@ PolyLine::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) cons
 	}
 }
 
+void
+PolyLine::set_steps (Points const & points, bool stepped)
+{
+	if (!stepped) {
+		PolyItem::set(points);
+		return;
+	}
+
+	Points copy;
+	for (Points::const_iterator p = points.begin(); p != points.end();) {
+		Points::const_iterator next = p;
+		++next;
+
+		copy.push_back(*p);
+		if (next != points.end() && next->x != p->x) {
+			copy.push_back(Duple(next->x, p->y));
+		}
+
+		p = next;
+	}
+
+	PolyItem::set(copy);
+}
+
 bool
 PolyLine::covers (Duple const & point) const
 {