Something so simple, yet so seemingly undocumented…
After struggling for about 10 minutes with trying to clear a TkCanvas from Ruby, and only finding what seemed to be one message discussing it (but not answering it), I stumbled across the answer – delete('all').
So, if I have a canvas like this:
def initialize(parent)
@parent = parent
ph = { 'padx' => 10, 'pady' => 10 }
clear_b = TkButton.new(parent) { text 'Clear'; pack(ph) }
clear_b.command{clear}
exit_b = TkButton.new(parent) { text 'Exit'; pack(ph)}
exit_b.command{ exit }
@canvas = TkCanvas.new(parent)
@canvas.pack
@start_x = @start_y = 0
@canvas.bind("1", lambda {|e| do_press(e.x, e.y)})
@canvas.bind("B1-Motion",
lambda {|x,y| do_motion(x,y)}, "%x %y")
@canvas.bind("ButtonRelease-1",
lambda {|x,y| do_release(x,y)}, "%x %y")
end
I can use this as the clear method to wipe the canvas:
def clear
if @canvas
@canvas.delete('all')
end
end
Easy as pie! ;)
self.out