kernel-shark: Add class Polyline to KsPlot namespace

This is a simple plotting class that represents a poly-line.

Link: https://lore.kernel.org/linux-trace-devel/20201209134530.428368-9-y.karadz@gmail.com

Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

2 files changed, 30 insertions, 0 deletions

diff --git a/src/KsPlotTools.cpp b/src/KsPlotTools.cpp
index 529f737d..9f983864 100644
--- a/src/KsPlotTools.cpp
+++ b/src/KsPlotTools.cpp
@@ -504,6 +504,20 @@ void Line::_draw(const Color &col, float size) const
 }
 
 /**
+ * @brief Create a default polyline. All points are initialized at (0, 0).
+ *
+ * @param n: The number of points connected by the polyline.
+ */
+Polyline::Polyline(size_t n)
+: Shape(n)
+{}
+
+void Polyline::_draw(const Color &col, float size) const
+{
+	ksplot_draw_polyline(_points, _nPoints, col.color_c_ptr(), size);
+}
+
+/**
  * @brief Create a default polygon. All points are initialized at (0, 0).
  *
  * @param n: The number of edges of the polygon.
diff --git a/src/KsPlotTools.hpp b/src/KsPlotTools.hpp
index 5ce8f6fc..4a7ca0a6 100644
--- a/src/KsPlotTools.hpp
+++ b/src/KsPlotTools.hpp
@@ -253,6 +253,22 @@ private:
 	void _draw(const Color &col, float size = 1.) const override;
 };
 
+/** This class represents a polyline. */
+class Polyline : public Shape {
+public:
+	Polyline(size_t n);
+
+	/**
+	 * @brief Destroy the polyline object. Keep this destructor virtual.
+	 */
+	virtual ~Polyline() {}
+
+private:
+	Polyline() = delete;
+
+	void _draw(const Color &, float size = 1.) const override;
+};
+
 /** This class represents a polygon. */
 class Polygon : public Shape {
 public: