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mpg_knob.py
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mpg_knob.py
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"""
Knob
====
The :class:`Knob` widget creates a component that looks like a
control Knob or Dial (from Wikipedia : "A control knob is a rotary
control used to provide input to a device when grasped by an
operator and turned, so that the degree of rotation corresponds to
the desired input." http://en.wikipedia.org/wiki/Control_knob).
To configure a knob a max/min, slope and step values should be provided.
Additionally, knobimg_source could be set to load
a texture that visually represents the knob.
Modified version for MPG use copied from https://github.com/kivy-garden/garden.knob
Changes:-
- Make changes relative and track direction.
- Disable the move to touch point, so move is relative to first touch
- add touch up event so we know when to execute function
"""
import math
from kivy.lang import Builder
from kivy.uix.widget import Widget
from kivy.properties import NumericProperty, ObjectProperty, StringProperty, BooleanProperty, ReferenceListProperty, BoundedNumericProperty, ListProperty
Builder.load_string('''
#
# Knob
# ====
# To create a basic knob (in a kv file):
#
# Knob:
# size: 100, 100
# min: 0
# max: 100
# step: 1
# slope: 1
# value: 0 # Default position of knob.
# knobimg_source: "img/knob_metal.png" # Knob texture
# show_marker: False # Do not show surrounding marker
#
# To create a knob with a surrounding marker:
#
# Knob:
# size: 100, 100
# min: 0
# max: 100
# step: 1
# slope: 1
# value: 0 # Default position of knob.
# knobimg_source: "img/knob_metal.png" # Knob texture
# show_marker: True # Show surrounding marker
# marker_img: "img/bline.png" # Marker texture image
# knob_size: 0.9 # Scales knob size to leave space for marker
# markeroff_color: 0, 0, 0, 0
<Knob>
size_hint: None, None
canvas.before:
Color:
rgba: self.markeroff_color
Ellipse:
pos: self.pos
size: self.size[0], self.size[1]
angle_start: 0
angle_end: 360
source: self.markeroff_img
Color:
rgba: self.marker_color
Ellipse:
pos: self.pos
size: self.size[0], self.size[1]
angle_start: self.marker_startangle
angle_end: self._angle + self.marker_ahead if self._angle > self.marker_startangle else self.marker_startangle
source: self.marker_img
Color:
rgba: self.knobimg_bgcolor
Ellipse:
pos: self.pos[0] + (self.size[0] * (1 - self.knobimg_size))/2, self.pos[1] + (self.size[1] * (1 - self.knobimg_size)) / 2
size: self.size[0] * (self.knobimg_size), self.size[1] * (self.knobimg_size)
Color:
rgba: self.knobimg_color
PushMatrix
Rotate:
angle: 360 - self._angle
origin: self.center
Rectangle:
pos: self.pos[0] + (self.size[0] * (1 - self.knobimg_size)) /2, self.pos[1] + (self.size[1] * (1 - self.knobimg_size)) / 2
size: self.size[0] * (self.knobimg_size), self.size[1] * (self.knobimg_size)
source: self.knobimg_source
canvas:
PopMatrix
''')
class Knob(Widget):
"""Class for creating a Knob widget."""
min = NumericProperty(0)
'''Minimum value for value :attr:`value`.
:attr:`min` is a :class:`~kivy.properties.NumericProperty` and defaults
to 0.
'''
max = NumericProperty(100)
'''Maximum value for value :attr:`value`.
:attr:`max` is a :class:`~kivy.properties.NumericProperty` and defaults
to 100.
'''
range = ReferenceListProperty(min, max)
''' Range of the values for Knob.
:attr:`range` is a :class:`~kivy.properties.ReferenceListProperty` of
(:attr:`min`, :attr:`max`).
'''
value = NumericProperty(0)
'''Current value of the knob. Set :attr:`value` when creating a knob to
set its initial position. An internal :attr:`_angle` is calculated to set
the position of the knob.
:attr:`value` is a :class:`~kivy.properties.NumericProperty` and defaults
to 0.
'''
step = BoundedNumericProperty(1, min=0)
'''Step interval of knob to go from min to max. An internal
:attr:`_angle_step` is calculated to set knob step in degrees.
:attr:`step` is a :class:`~kivy.properties.BoundedNumericProperty`
and defaults to 1 (min=0).
'''
curve = BoundedNumericProperty(1, min=1)
'''This parameter determines the shape of the map function. It represent the
reciprocal of a power function's exponent used to map the input value.
So, for higher values of curve the contol is more reactive, and conversely.
'''
knobimg_source = StringProperty("")
'''Path of texture image that visually represents the knob. Use PNG for
transparency support. The texture is rendered on a centered rectangle of
size = :attr:`size` * :attr:`knobimg_size`.
:attr:`knobimg_source` is a :class:`~kivy.properties.StringProperty`
and defaults to empty string.
'''
knobimg_color = ListProperty([1, 1, 1, 1])
'''Color to apply to :attr:`knobimg_source` texture when loaded.
:attr:`knobimg_color` is a :class:`~kivy.properties.ListProperty`
and defaults to [1,1,1,1].
'''
knobimg_size = BoundedNumericProperty(0.9, max=1.0, min=0.1)
''' Internal proportional size of rectangle that holds
:attr:`knobimg_source` texture.
:attr:`knobimg_size` is a :class:`~kivy.properties.BoundedNumericProperty`
and defaults to 0.9.
'''
show_marker = BooleanProperty(True)
''' Shows/hides marker surrounding knob. use :attr:`knob_size` < 1.0 to
leave space to marker.
:attr:`show_marker` is a :class:`~kivy.properties.BooleanProperty`
and defaults to True.
'''
marker_img = StringProperty("")
'''Path of texture image that visually represents the knob marker. The
marker is rendered in a centered Ellipse (Circle) with the same size of
the widget and goes from angle_start=:attr:`marker_startangle` to
angle_end=:attr:`_angle`.
:attr:`marker_img` is a :class:`~kivy.properties.StringProperty` and
defaults to "".
'''
marker_color = ListProperty([1, 1, 1, 1])
'''Color to apply to :attr:`marker_img` texture when loaded.
:attr:`marker_color` is a :class:`~kivy.properties.ListProperty`
and defaults to [1,1,1,1].
'''
knobimg_bgcolor = ListProperty([0, 0, 0, 1])
''' Background color behind :attr:`knobimg_source` texture.
:attr:`value` is a :class:`~kivy.properties.ListProperty` and defaults
to [0,0,0,1].
'''
markeroff_img = StringProperty("")
'''Path of texture image that visually represents the knob marker where
it's off, that is, parts of the marker that haven't been reached yet by
the knob (:attr:`value`).
:attr:`markeroff_img` is a :class:`~kivy.properties.StringProperty`
and defaults to "".
'''
markeroff_color = ListProperty([0, 0, 0, 0])
'''Color applied to :attr:`markeroff_img` int the Canvas.
:attr:`markeroff_color` is a :class:`~kivy.properties.ListProperty`
and defaults to [0,0,0,0].
'''
marker_startangle = NumericProperty(0)
'''Starting angle of Ellipse where :attr:`marker_img` is rendered.
:attr:`value` is a :class:`~kivy.properties.NumericProperty` and defaults
to 0.
'''
marker_ahead = NumericProperty(0)
''' Adds degrees to angle_end of marker (except when :attr:`value` == 0).
:attr:`marker_ahead` is a :class:`~kivy.properties.NumericProperty`
and defaults to 0.
'''
ticks = NumericProperty(0)
_angle = NumericProperty(0) # Internal angle calculated from value.
_angle_step = NumericProperty(0) # Internal angle_step calculated from step.
def __init__(self, *args, **kwargs):
super(Knob, self).__init__(*args, **kwargs)
self.bind(show_marker=self._show_marker)
self.bind(value=self._value)
self.register_event_type('on_release')
self.register_event_type('on_tick')
def _value(self, instance, value):
self._angle = pow((value - self.min) / (self.max - self.min), 1. / self.curve) * 360.
self.on_knob(value)
def _show_marker(self, instance, flag):
# "show/hide" marker.
if flag:
self.knobimg_bgcolor[3] = 1
self.marker_color[3] = 1
self.markeroff_color[3] = 1
else:
self.knobimg_bgcolor[3] = 0
self.marker_color[3] = 0
self.markeroff_color[3] = 0
def on_touch_down(self, touch):
if self.collide_point(*touch.pos):
self.update_angle(touch, True)
touch.grab(self)
return True
def on_touch_move(self, touch):
if touch.grab_current is not self:
return
self.update_angle(touch)
def on_touch_up(self, touch):
if touch.grab_current is not self:
return
touch.ungrab(self)
self.dispatch('on_release')
def on_release(self):
pass
def update_angle(self, touch, first=False):
posx, posy = touch.pos
cx, cy = self.center
rx, ry = posx - cx, posy - cy
if ry >= 0: # Quadrants are clockwise.
quadrant = 1 if rx >= 0 else 4
else:
quadrant = 3 if rx <= 0 else 2
try:
angle = math.atan(rx / ry) * (180. / math.pi)
if quadrant == 2 or quadrant == 3:
angle = 180 + angle
elif quadrant == 4:
angle = 360 + angle
except Exception: # atan not def for angle 90 and 270
angle = 90 if quadrant <= 2 else 270
# handle relative ticks per move
if first:
self._start_angle = angle
self._last_angle = angle
# print('start angle= {}'.format(self._start_angle))
# print("angle= {}, direction= {}, clicks= {}".format(angle, self._last_angle <= angle, abs(self._last_angle-angle)))
t = angle - self._last_angle
# handle wrap around
if t > 270:
t = t - 360
if t < -270:
t = t + 360
if abs(t) >= 1.0:
# only issue event every full degree
self.ticks = int(t)
self._last_angle = angle
self.dispatch('on_tick')
# original handle absolute position
self._angle_step = (self.step * 360) / (self.max - self.min)
self._angle = self._angle_step
while self._angle < angle:
self._angle = self._angle + self._angle_step
relativeValue = pow((angle / 360.), 1. / self.curve)
self.value = (relativeValue * (self.max - self.min)) + self.min
def on_tick(self):
pass
# TO OVERRIDE
def on_knob(self, value):
pass # Knob values listenerr