def build(self):
root_widget = BoxLayout(orientation='vertical')
drawing_widget = DrawingWidget()
red_slider = Slider(min=0, max=1, value=0.5,
size_hint_y=None, height=80)
green_slider = Slider(min=0, max=1, value=0.5,
size_hint_y=None, height=80)
blue_slider = Slider(min=0, max=1, value=0.5,
size_hint_y=None, height=80)
colour_row = BoxLayout(orientation='horizontal',
size_hint_y=None, height=80)
colour_label = Label(text='output colour:')
colour_widget = Widget()
# We draw a Rectangle on colour_widget exactly the same way as
# with DrawingWidget, just without making a new class
with colour_widget.canvas:
output_colour = Color(red_slider.value,
green_slider.value,
blue_slider.value)
output_rectangle = Rectangle()
def update_colour_widget_rect(instance, value):
output_rectangle.pos = colour_widget.pos
output_rectangle.size = colour_widget.size
colour_widget.bind(pos=update_colour_widget_rect,
size=update_colour_widget_rect)
def update_colour_widget_colour(instance, value):
output_colour.rgb = (red_slider.value,
green_slider.value,
blue_slider.value)
red_slider.bind(value=update_colour_widget_colour)
green_slider.bind(value=update_colour_widget_colour)
blue_slider.bind(value=update_colour_widget_colour)
root_widget.add_widget(drawing_widget)
root_widget.add_widget(red_slider)
root_widget.add_widget(green_slider)
root_widget.add_widget(blue_slider)
root_widget.add_widget(colour_row)
colour_row.add_widget(colour_label)
colour_row.add_widget(colour_widget)
return root_widget
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