--- 01-gui.py	2006-01-03 03:56:43.000000000 -0200
+++ 02-line.py	2006-01-03 04:01:15.000000000 -0200
@@ -2,6 +2,50 @@
 
 from eagle import *
 
+class Tool( object ):
+    """Interface to be implemented by tools."""
+
+
+    def mouse( self, app, canvas, buttons, x, y ):
+        """This tool have a user feedback using mouse on canvas."""
+        pass
+    # mouse()
+# Tool
+
+
+class Line( Tool ):
+    def __init__( self ):
+        self.first_point = None
+    # __init__()
+
+
+    def mouse( self, app, canvas, buttons, x, y ):
+        if buttons & Canvas.MOUSE_BUTTON_1:
+            if self.first_point is None:
+                self.first_point = ( x, y )
+            else:
+                color = app[ "fg" ]
+                size  = app[ "size" ]
+                x0, y0 = self.first_point
+                canvas.draw_line( x0, y0, x, y, color, size )
+                self.first_point = None
+    # mouse()
+# Line
+
+
+tools = {
+    "Line": Line(),
+    }
+def_tool="Line"
+
+
+def canvas_action( app, canvas, buttons, x, y ):
+    tool = app[ "tool" ]
+    tools[ tool ].mouse( app, canvas, buttons, x, y )
+# canvas_action()
+
+
+
 app = App( title="Paint",
            id="paint",
            statusbar=True,
@@ -15,6 +59,8 @@
                          ),
                   Selection( id="tool",
                              label="Tool:",
+                             options=tools.keys(),
+                             active=def_tool,
                              ),
                   UIntSpin( id="size",
                             label="Line Size:",
@@ -57,6 +103,7 @@
                             width=400,
                             height=400,
                             bgcolor="white",
+                            callback=canvas_action,
                             ),
                     )
            )