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Merge pull request #19 from samclane/color-scale
Color scale
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,4 +1,4 @@ | ||
| VERSION = "1.3.4" | ||
| BUILD_DATE = "2018-06-06T17:00:22.551617" | ||
| VERSION = "1.4.0" | ||
| BUILD_DATE = "2018-06-10T17:41:52.285612" | ||
| AUTHOR = "Sawyer McLane" | ||
| DEBUGGING = True | ||
| DEBUGGING = True |
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| import tkinter as tk | ||
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| from utils import tuple2hex, HueToRGB, KelvinToRGB | ||
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| class ColorScale(tk.Canvas): | ||
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| def __init__(self, parent, val=0, height=13, width=100, variable=None, from_=0, to=360, command=None, | ||
| gradient='hue', **kwargs): | ||
| """ | ||
| Create a GradientBar. | ||
| Keyword arguments: | ||
| * parent: parent window | ||
| * val: initially selected value | ||
| * variable: IntVar linked to the alpha value | ||
| * from_: The minimum value the slider can take on | ||
| * to: The maximum value of the slider | ||
| * command: A function callback, invoked every time the slider is moved | ||
| * gradient: The type of background coloration | ||
| * height, width, and any keyword argument accepted by a tkinter Canvas | ||
| """ | ||
| tk.Canvas.__init__(self, parent, width=width, height=height, **kwargs) | ||
| self.parent = parent | ||
| self.max = to | ||
| self.min = from_ | ||
| self.range = self.max - self.min | ||
| self._variable = variable | ||
| self.command = command | ||
| self.color_grad = gradient | ||
| if variable is not None: | ||
| try: | ||
| val = int(variable.get()) | ||
| except Exception as e: | ||
| print(e) | ||
| else: | ||
| self._variable = tk.IntVar(self) | ||
| val = max(min(self.max, val), self.min) | ||
| self._variable.set(val) | ||
| self._variable.trace("w", self._update_val) | ||
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| self.gradient = tk.PhotoImage(master=self, width=width, height=height) | ||
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| self.bind('<Configure>', lambda e: self._draw_gradient(val)) | ||
| self.bind('<ButtonPress-1>', self._on_click) | ||
| self.bind('<B1-Motion>', self._on_move) | ||
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| def _draw_gradient(self, val): | ||
| """Draw the gradient and put the cursor on val.""" | ||
| self.delete("gradient") | ||
| self.delete("cursor") | ||
| del self.gradient | ||
| width = self.winfo_width() | ||
| height = self.winfo_height() | ||
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| self.gradient = tk.PhotoImage(master=self, width=width, height=height) | ||
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| line = [] | ||
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| if self.color_grad == 'bw': | ||
| def f(i): | ||
| line.append(tuple2hex((int(float(i) / width * 255),) * 3)) | ||
| elif self.color_grad == 'wb': | ||
| def f(i): | ||
| line.append(tuple2hex((int((1 - (float(i) / width)) * 255),) * 3)) | ||
| elif self.color_grad == 'kelvin': | ||
| def f(i): | ||
| line.append(tuple2hex(KelvinToRGB(((float(i) / width) * self.range) + self.min))) | ||
| else: # self.color_grad == 'hue' | ||
| def f(i): | ||
| line.append(tuple2hex(HueToRGB(float(i) / width * 360))) | ||
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| for i in range(width): | ||
| f(i) | ||
| line = "{" + " ".join(line) + "}" | ||
| self.gradient.put(" ".join([line for j in range(height)])) | ||
| self.create_image(0, 0, anchor="nw", tags="gradient", image=self.gradient) | ||
| self.lower("gradient") | ||
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| x = (val - self.min) / float(self.range) * width | ||
| self.create_line(x, 0, x, height, width=4, fill='white', tags="cursor") | ||
| self.create_line(x, 0, x, height, width=2, tags="cursor") | ||
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| def _on_click(self, event): | ||
| """Move selection cursor on click.""" | ||
| x = event.x | ||
| if x >= 0: | ||
| width = self.winfo_width() | ||
| for s in self.find_withtag("cursor"): | ||
| self.coords(s, x, 0, x, self.winfo_height()) | ||
| self._variable.set(round((float(self.range) * x) / width + self.min, 2)) | ||
| if self.command is not None: | ||
| self.command() | ||
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| def _on_move(self, event): | ||
| """Make selection cursor follow the cursor.""" | ||
| if event.x >= 0: | ||
| w = self.winfo_width() | ||
| x = min(max(abs(event.x), 0), w) | ||
| for s in self.find_withtag("cursor"): | ||
| self.coords(s, x, 0, x, self.winfo_height()) | ||
| self._variable.set(round((float(self.range) * x) / w + self.min, 2)) | ||
| if self.command is not None: | ||
| self.command() | ||
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| def _update_val(self, *args): | ||
| val = int(self._variable.get()) | ||
| val = min(max(val, self.min), self.max) | ||
| self.set(val) | ||
| self.event_generate("<<HueChanged>>") | ||
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| def get(self): | ||
| """Return val of color under cursor.""" | ||
| coords = self.coords('cursor') | ||
| width = self.winfo_width() | ||
| return round(self.range * coords[0] / width, 2) | ||
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| def set(self, val): | ||
| """Set cursor position on the color corresponding to the value""" | ||
| width = self.winfo_width() | ||
| x = (val - self.min) / float(self.range) * width | ||
| for s in self.find_withtag("cursor"): | ||
| self.coords(s, x, 0, x, self.winfo_height()) | ||
| self._variable.set(val) |
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