How to use the nanogui.Color function in nanogui

#
# All rights reserved. Use of this source code is governed by a
# BSD-style license that can be found in the LICENSE.txt file.

import nanogui
import math
import gc

from nanogui import Screen, FormHelper

bvar = True
ivar = 12345678
dvar = math.pi
strvar = "A string"
enumvar = 1
colvar = nanogui.Color(.5, .5, .7, 1)


def make_accessors(name):
    def setter(value):
        globals()[name] = value

    def getter():
        return globals()[name]
    return setter, getter

nanogui.init()

use_gl_4_1 = False # Set to True to create an OpenGL 4.1 context.
if use_gl_4_1:
    # NanoGUI presents many options for you to utilize at your discretion.
    # See include/nanogui/screen.h for what all of the options are.

def cb0():
            self.canvas.setBackgroundColor(Color(random.random(), random.random(), random.random(), 1.0))
        b0.setCallback(cb0)

intBox.setMinValue(1)
        intBox.setValueIncrement(2)

        Label(window, "Checkbox :", "sans-bold")

        cb = CheckBox(window, "Check me")
        cb.setFontSize(16)
        cb.setChecked(True)

        Label(window, "Combo box :", "sans-bold")
        cobo = ComboBox(window, ["Item 1", "Item 2", "Item 3"])
        cobo.setFontSize(16)
        cobo.setFixedSize((100, 20))

        Label(window, "Color picker :", "sans-bold");
        cp = ColorPicker(window, Color(255, 120, 0, 255));
        cp.setFixedSize((100, 20));

        def cp_final_cb(color):
            print(
                "ColorPicker Final Callback: [{0}, {1}, {2}, {3}]".format(color.r,
                                                                          color.g,
                                                                          color.b,
                                                                          color.w)
            )

        cp.setFinalCallback(cp_final_cb)

        # setup a fast callback for the color picker widget on a new window
        # for demonstrative purposes
        window = Window(self, "Color Picker Fast Callback")
        window.setPosition((425, 300))

def __init__(self):
        super(TestApp, self).__init__((1024, 768), "NanoGUI Test")

        window = Window(self, "Button demo")
        window.setPosition((15, 15))
        window.setLayout(GroupLayout())

        Label(window, "Push buttons", "sans-bold")
        b = Button(window, "Plain button")

        def cb():
            print("pushed!")
        b.setCallback(cb)

        b = Button(window, "Styled", entypo.ICON_ROCKET)
        b.setBackgroundColor(Color(0, 0, 1.0, 0.1))
        b.setCallback(cb)

        Label(window, "Toggle buttons", "sans-bold")
        b = Button(window, "Toggle me")
        b.setFlags(Button.Flags.ToggleButton)

        def change_cb(state):
            print("Toggle button state: %s" % str(state))
        b.setChangeCallback(change_cb)

        Label(window, "Radio buttons", "sans-bold")
        b = Button(window, "Radio button 1")
        b.setFlags(Button.Flags.RadioButton)
        b = Button(window, "Radio button 2")
        b.setFlags(Button.Flags.RadioButton)

def __init__(self):
        super(TestApp, self).__init__((800, 600), "NanoGUI Test", False)

        window = Window(self, "GLCanvas Demo")
        window.setPosition((15, 15))
        window.setLayout(GroupLayout())

        self.canvas = MyGLCanvas(window)
        self.canvas.setBackgroundColor(Color(0.5, 0.5, 0.5, 1.0))
        self.canvas.setSize((400, 400))

        self.canvas.rotation = [0.25, 0.5, 0.33]

        tools = Widget(window)
        tools.setLayout(BoxLayout(Orientation.Horizontal,
                                  Alignment.Middle, 0, 5))

        b0 = Button(tools, "Random Color")
        def cb0():
            self.canvas.setBackgroundColor(Color(random.random(), random.random(), random.random(), 1.0))
        b0.setCallback(cb0)

        b1 = Button(tools, "Random Rotation")
        def cb1():
            self.canvas.rotation = [random.random(), random.random(), random.random()]

intBox.setMinValue(1)
        intBox.setValueIncrement(2)

        Label(window, "Checkbox :", "sans-bold")

        cb = CheckBox(window, "Check me")
        cb.setFontSize(16)
        cb.setChecked(True)

        Label(window, "Combo box :", "sans-bold")
        cobo = ComboBox(window, ["Item 1", "Item 2", "Item 3"])
        cobo.setFontSize(16)
        cobo.setFixedSize((100, 20))

        Label(window, "Color picker :", "sans-bold");
        cp = ColorPicker(window, Color(255, 120, 0, 255));
        cp.setFixedSize((100, 20));

        def cp_final_cb(color):
            print(
                "ColorPicker Final Callback: [{0}, {1}, {2}, {3}]".format(color.r,
                                                                          color.g,
                                                                          color.b,
                                                                          color.w)
            )

        cp.setFinalCallback(cp_final_cb)

        # setup a fast callback for the color picker widget on a new window
        # for demonstrative purposes
        window = Window(self, "Color Picker Fast Callback")
        window.setPosition((425, 300))

def __init__(self):
        super(TestApp, self).__init__((1024, 768), "NanoGUI Test")

        window = Window(self, "Button demo")
        window.setPosition((15, 15))
        window.setLayout(GroupLayout())

        Label(window, "Push buttons", "sans-bold")
        b = Button(window, "Plain button")

        def cb():
            print("pushed!")
        b.setCallback(cb)

        b = Button(window, "Styled", entypo.ICON_ROCKET)
        b.setBackgroundColor(Color(0, 0, 1.0, 0.1))
        b.setCallback(cb)

        Label(window, "Toggle buttons", "sans-bold")
        b = Button(window, "Toggle me")
        b.setFlags(Button.Flags.ToggleButton)

        def change_cb(state):
            print("Toggle button state: %s" % str(state))
        b.setChangeCallback(change_cb)

        Label(window, "Radio buttons", "sans-bold")
        b = Button(window, "Radio button 1")
        b.setFlags(Button.Flags.RadioButton)
        b = Button(window, "Radio button 2")
        b.setFlags(Button.Flags.RadioButton)