def __init__(self,
parent,
tempColor=4000,
height=11,
width=500,
variable=None,
**kwargs):
"""
Create a TemperatureGradBar.
Keyword arguments:
* parent: parent window
* tempColor: initially selected tempColor value
* variable: IntVar linked to the alpha value
* height, width, and any keyword argument accepted by a tkinter Canvas
"""
tk.Canvas.__init__(self, parent, width=width, height=height, **kwargs)
self._variable = variable
if variable is not None:
try:
tempColor = int(variable.get())
except Exception:
pass
else:
self._variable = tk.IntVar(self)
tempColor -= 1500
if tempColor > 5200:
tempColor = 5200
elif tempColor < 1500:
tempColor = 1500
try:
self._variable.trace_add("write", self._update_temperature)
except Exception:
self._variable.trace("w", self._update_temperature)
self.gradient = tk.PhotoImage(master=self, width=width, height=height)
self.bind('<Configure>', lambda e: self._draw_gradient(tempColor))
self.bind('<ButtonPress-1>', self._on_click)
self.bind('<B1-Motion>', self._on_move)
def __init__(self,
parent,
hue=0,
value=0,
height=11,
width=256,
variable=None,
**kwargs):
"""
Create a GradientBar.
Keyword arguments:
* parent: parent window
* hue: initially selected hue value
* variable: IntVar linked to the alpha value
* height, width, and any keyword argument accepted by a tkinter Canvas
"""
tk.Canvas.__init__(self, parent, width=width, height=height, **kwargs)
self._variable = variable
if variable is not None:
try:
hue = int(variable.get())
except Exception:
pass
else:
self._variable = tk.IntVar(self)
if hue > 360:
hue = 360
elif hue < 0:
hue = 0
self._variable.set(hue)
try:
self._variable.trace_add("write", self._update_hue)
except Exception:
self._variable.trace("w", self._update_hue)
self.gradient = tk.PhotoImage(master=self, width=width, height=height)
self.bind('<Configure>', lambda e: self._draw_gradient(hue))
self.bind('<ButtonPress-1>', self._on_click)
self.bind('<B1-Motion>', self._on_move)
def __init__(self,
parent,
alpha=255,
color=(255, 0, 0),
height=11,
width=256,
variable=None,
**kwargs):
"""
Create a bar to select the alpha value.
Keyword arguments:
* parent: parent window
* alpha: initially selected alpha value
* color: gradient color
* variable: IntVar linked to the alpha value
* height, width, and any keyword argument accepted by a tkinter Canvas
"""
tk.Canvas.__init__(self, parent, width=width, height=height, **kwargs)
self.gradient = tk.PhotoImage(master=self, width=width, height=height)
self._variable = variable
if variable is not None:
try:
alpha = int(variable.get())
except Exception:
pass
else:
self._variable = tk.IntVar(self)
if alpha > 255:
alpha = 255
elif alpha < 0:
alpha = 0
self._variable.set(alpha)
try:
self._variable.trace_add("write", self._update_alpha)
except Exception:
self._variable.trace("w", self._update_alpha)
self.bind('<Configure>', lambda e: self._draw_gradient(alpha, color))
self.bind('<ButtonPress-1>', self._on_click)
self.bind('<B1-Motion>', self._on_move)