add svgs-tkinter-python3

2 files changed, 115 insertions, 0 deletions

diff --git a/svgs-tkinter-python3.py/description b/svgs-tkinter-python3.py/description
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+display svg python3 tkinter
diff --git a/svgs-tkinter-python3.py/svgs-tkinter-python3.py b/svgs-tkinter-python3.py/svgs-tkinter-python3.py
new file mode 100755
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+#!/usr/bin/env python3
+# File: svgs-tkinter-python3.py
+# License: CC-BY-SA 4.0
+# Author: bgstack15
+# Startdate: 2019-06-21 10:09
+# Title: 
+# Purpose: 
+# History:
+# Usage:
+# References:
+#    http://effbot.org/tkinterbook/button.htm
+#    http://effbot.org/tkinterbook/tkinter-application-windows.htm
+#    http://effbot.org/tkinterbook/
+#    https://stackoverflow.com/questions/18537918/set-window-icon#18538416
+#    https://pillow.readthedocs.io/en/stable/reference/ImageTk.html
+# Improve:
+# Dependencies:
+#    devuan: python3-tk python3-pil.imagetk python3-cairosvg
+#    el7: python36-tkinter python36-pillow-tk ( pip3 install cairosvg )
+
+import re
+import tkinter as tk
+from PIL import Image, ImageTk, PngImagePlugin
+
+LM_USE_SVG = 0
+try:
+   from cairosvg import svg2png
+   LM_USE_SVG = 1
+except:
+   print("WARNING: Unable to import cairosvg. No svg images will be displayed.")
+   LM_USE_SVG = 0
+
+# graphical classes and functions
+print("Loading graphics...")
+
+def photoimage_from_svg(filename = "",size = "48"):
+   # this one works, but does not allow me to set the size.
+   # this is kept as an example of how to open a svg without saving to a file.
+   # open svg
+   item = svg2png(url=filename, parent_width = size, parent_height = size)
+   return ImageTk.PhotoImage(data=item)
+
+def empty_photoimage(size=24):
+   photo = Image.new("RGBA",[size,size])
+   return ImageTk.PhotoImage(image=photo)
+
+def image_from_svg(filename = "",size = 0):
+   # open svg
+   if LM_USE_SVG == 1:
+      if size == 0:
+         # unscaled
+         svg2png(url=filename,write_to="/tmp/example_temp_image.png")
+      else:
+         svg2png(url=filename,write_to="/tmp/example_temp_image.png",parent_width = size,parent_height = size)
+      photo = Image.open("/tmp/example_temp_image.png")
+   else:
+      photo = Image.new("RGBA",[size,size])
+   return photo
+
+def get_scaled_icon(iconfilename, size = 0):
+
+   try:
+      print("Opening icon file",iconfilename)
+      # try an svg
+      if re.compile(".*\.svg").match(iconfilename):
+         photo = image_from_svg(filename=iconfilename, size=size)
+      else:
+         photo = Image.open(iconfilename)
+   except Exception as f:
+      print("Error with icon file:", f)
+      return empty_photoimage()
+
+   if size != 0 and (type(photo) is Image or type(photo) is PngImagePlugin.PngImageFile):
+      photo.thumbnail(size=[size, size])
+
+   if not type(photo) is ImageTk.PhotoImage:
+      try:
+         photo = ImageTk.PhotoImage(photo)
+      except Exception as e:
+         print("Error was ",e)
+   return photo
+
+class App:
+   def __init__(self, master):
+      frame = tk.Frame(master)
+      frame.grid(row=0)
+
+      self.photo1 = get_scaled_icon("/usr/share/icons/Numix/128/actions/system-log-out.svg", 20)
+      self.button1 = tk.Button(frame, text="Scaled to 24x24", image=self.photo1, compound=tk.LEFT)
+      self.button1.grid(row=0,column=0)
+
+      self.photo2 = get_scaled_icon("/usr/share/icons/Numix/128/actions/system-log-out.svg")
+      self.button2 = tk.Button(frame, text="Unscaled", image=self.photo2, compound=tk.LEFT)
+      self.button2.grid(row=0,column=1)
+
+      self.buttonCancel = tk.Button(frame, text="Cancel", underline=0, command=self.quitaction)
+      self.buttonCancel.grid(row=1,columnspan=8,sticky=tk.W+tk.E)
+
+   def quitaction(self,b=None):
+      print("Closing the window...")
+      root.destroy()
+
+root = tk.Tk()
+
+# MAIN LOOP
+root.title("SVG examples")
+imgicon = get_scaled_icon("/usr/share/icons/Numix/128/actions/system-log-out.svg", 24)
+root.tk.call('wm','iconphoto', root._w, imgicon)
+app = App(root)
+root.mainloop()
+try:
+   root.destroy()
+except:
+   pass