Implement erasing

canvas.py

@@ -21,10 +21,12 @@ class EditorCanvas(tkinter.Canvas):
         self.view_y=0
         self.bind("<B1-Motion>",self.handle_draw)
         self.bind("<Button-1>",self.handle_draw)
-        self.bind("<Button-3>",self.handle_move_start)
-        self.bind("<B3-Motion>",self.handle_move)
+        self.bind("<Button-2>",self.handle_move_start)
+        self.bind("<B2-Motion>",self.handle_move)
+        self.bind("<Button-3>",self.handle_erase)
+        self.bind("<B3-Motion>",self.handle_erase)
         if platform.system()=="Windows" or platform.system()=="Darwin":
-            self.bind("<MouseWheel>",lambda event: self.handle_zoom(event.delta))
+            self.bind("<MouseWheel>",lambda event: self.handle_zoom(event.delta/120))
         else:
             # This will probably work only on X11
             self.bind("<Button-4>",lambda _: self.handle_zoom(1))
@@ -76,6 +78,16 @@ class EditorCanvas(tkinter.Canvas):
         self.draw()
 
 
+    def handle_erase(self,event):
+        pixel_pos=self.cursor_pos_to_pixel((event.x,event.y))
+        if not pixel_pos:
+            return
+        self.current_char_modified=True
+        self.project.modified=True
+        self.current_char_pixels[pixel_pos[0]*self.project.char_res[1]+pixel_pos[1]]=0
+        self.draw()
+
+
     def handle_zoom(self,delta):
         self.grid_size+=delta
         self.width=self.project.char_res[0]*self.grid_size