# Author: Miguel Martinez Lopez # # Uncomment the next line to see my email # print("Author's email: %s"%"61706c69636163696f6e616d656469646140676d61696c2e636f6d".decode("hex")) # PIL is more efficient manipulating directly pixels than PhotoImage. See this discussion: # https://groups.google.com/forum/#!topic/comp.lang.python/nQ6YO-dTz10 # # To install PIL on windows for Python 3, read this: # http://stackoverflow.com/questions/7407185/pil-for-python-3-2-on-windows-or-alternatives # # To install ImageTk for Python 2.7 on ubuntu do: # sudo apt-get install python-imaging-tk # and for Python 3: # sudo apt-get install python3-pil.imagetk # try: from Tkinter import Canvas from Tkconstants import * except ImportError: from tkinter import Canvas from tkinter.constants import * from PIL import Image, ImageDraw, ImageTk # Python 2/3 compatibility try: basestring except NameError: basestring = str def hex2rgb(str_rgb): try: rgb = str_rgb[1:] if len(rgb) == 6: r, g, b = rgb[0:2], rgb[2:4], rgb[4:6] elif len(rgb) == 3: r, g, b = rgb[0] * 2, rgb[1] * 2, rgb[2] * 2 else: raise ValueError() except: raise ValueError("Invalid value %r provided for rgb color." % str_rgb) return tuple(int(v, 16) for v in (r, g, b)) class GradientFrame(Canvas): def __init__(self, master, from_color, to_color, width=None, height=None, orient=HORIZONTAL, steps=None): Canvas.__init__(self, master) if steps is None: if orient == HORIZONTAL: steps = height else: steps = width if isinstance(from_color, basestring): from_color = hex2rgb(from_color) if isinstance(to_color, basestring): to_color = hex2rgb(to_color) r,g,b = from_color dr = float(to_color[0] - from_color[0])/steps dg = float(to_color[1] - from_color[1])/steps db = float(to_color[2] - from_color[2])/steps if orient == HORIZONTAL: if height is None: raise ValueError("height can not be None") self.configure(height=height) width = self.winfo_screenwidth() image = Image.new("RGB", (width, height), "#FFFFFF") draw = ImageDraw.Draw(image) for i in range(steps): r,g,b = r+dr, g+dg, b+db y0 = int(float(height * i)/steps) y1 = int(float(height * (i+1))/steps) draw.rectangle((0, y0, width, y1), fill=(int(r),int(g),int(b))) else: if width is None: raise ValueError("width can not be None") self.configure(width=width) height = self.winfo_screenheight() image= Image.new("RGB", (width, height), "#FFFFFF") draw = ImageDraw.Draw(image) for i in range(steps): r,g,b = r+dr, g+dg, b+db x0 = int(float(width * i)/steps) x1 = int(float(width * (i+1))/steps) draw.rectangle((x0, 0, x1, height), fill=(int(r),int(g),int(b))) self._gradient_photoimage = ImageTk.PhotoImage(image) self.create_image(0, 0, anchor=NW, image=self._gradient_photoimage) if __name__ == "__main__": try: from Tkinter import Tk, Label except ImportError: from tkinter import Tk, Label root = Tk() Label(root, text="Gradient 1:").pack(anchor=W) GradientFrame(root, from_color="#000000", to_color="#E74C3C", height=100).pack(fill=X) Label(root, text="Gradient 2 (GTK gradient):").pack(anchor=W, pady=(20,0)) GradientFrame(root, from_color="#FCFCFC", to_color="#E2E2E2", height=30).pack(fill=X, pady=(0,10)) root.mainloop()