X-Git-Url: https://www.fleuret.org/cgi-bin/gitweb/gitweb.cgi?p=dyncnn.git;a=blobdiff_plain;f=canvas.h;h=55390ba132af35f6c3d64f9c5dd7e376a1107233;hp=f54f6d069fd4f6b1459de29fff3a3727d7aed194;hb=fe5dee151313b6abd8ffee2c5fc5593f326e663f;hpb=be0c7d53f21ce96c70e7c13ef0ba2c9eca10ca23

diff --git a/canvas.h b/canvas.h
index f54f6d0..55390ba 100644
--- 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;