Many fixes, now generates a single image per frame.

[dyncnn.git] / canvas.h

diff --git a/canvas.h b/canvas.h
index f54f6d0..55390ba 100644 (file)
--- a/canvas.h
+++ b/canvas.h
@@ -29,6 +29,8 @@
 
 class Canvas {
 public:
+  virtual ~Canvas();
+  virtual void clear() = 0;
   virtual void set_line_width(scalar_t w) = 0;
   virtual void set_drawing_color(scalar_t r, scalar_t g, scalar_t b) = 0;
   virtual void draw_polygon(int filled, int nb, scalar_t *x, scalar_t *y) = 0;