added screenshots for Windows

Readme.md

@@ -116,6 +116,24 @@ colors and removed the round corners, and added a border to the buttons:
 
 ![](documentation_images/complex_example_other_style.png)
 
+### Customtkinter on Windows/Linux
+
+All elements of Customtkinter are drawn on the ```tkinter.Canvas```.
+But the Tkinter canvas supports antialiasing only on macOS, so on Windows
+and Linux the elements are rendered in a much worse quality. So you have
+to experiment with the ```corner_radius``` and look when the rounded corners
+look best. I tried to design the too complex example programs so that they
+also look acceptable on Windows. Maybe you can use the parameters for
+```corner_radius``` and ```width``` for your program as well.
+
+Example 1:```examples/complex_example.py```
+
+![](documentation_images/Windows_light.png)
+
+Example 2: ```examples/complex_example_other_style.py```
+
+![](documentation_images/Windows_dark.png)
+
 ### CTkButton with images
 It's also possible to put an image on a CTkButton. You just have to
 pass a PhotoImage object to the CTkButton with the argument ``image``.

customtkinter/customtkinter_checkbox.py

@@ -17,7 +17,7 @@ class CTkCheckBox(tkinter.Frame):
                  border_width=3,
                  width=25,
                  height=25,
-                 corner_radius=5,
+                 corner_radius=4,
                  text_font=None,
                  text_color=CTkColorManager.TEXT,
                  text="CTkCheckBox",

customtkinter/customtkinter_progressbar.py

@@ -136,7 +136,7 @@ class CTkProgressBar(tkinter.Frame):
         else:
             # ovals and rects are always rendered too large on Windows and need to be made smaller by -1
             oval_bottom_right_shift = -1
-            rect_bottom_right_shift = -1
+            rect_bottom_right_shift = -0
 
         # frame_border
         if self.border_width > 0:

customtkinter/customtkinter_slider.py

@@ -147,7 +147,7 @@ class CTkSlider(tkinter.Frame):
 
         # ovals and rects are always rendered too large and need to be made smaller by -1
         oval_bottom_right_shift = -1
-        rect_bottom_right_shift = -1
+        rect_bottom_right_shift = 0
 
         # frame_border
         if self.border_width > 0:

examples/complex_example.py

@@ -130,7 +130,7 @@ class App(tkinter.Tk):
         self.entry = customtkinter.CTkEntry(master=self.frame_right,
                                             width=120,
                                             height=25,
-                                            corner_radius=10)
+                                            corner_radius=8)
         self.entry.place(relx=0.33, rely=0.92, anchor=tkinter.CENTER)
         self.entry.insert(0, "CTkEntry")