tkinter stipple选项在OS X中运行不正常

Question

我在Windows和OS上运行这个示例code来测试stipple，但结果不同。怎么一回事？

Windows与OS X

# semi-transparent-stipple-demo.py
# note: stipple only works for some objects (like rectangles)
# and not others (like ovals).  But it's better than nothing...

from Tkinter import *

def redrawAll(canvas):
    canvas.delete(ALL)
    # draw a red rectangle on the left half
    canvas.create_rectangle(0, 0, 250, 600, fill="red")
    # draw semi-transparent rectangles in the middle
    canvas.create_rectangle(200,  75, 300, 125, fill="blue", stipple="")
    canvas.create_rectangle(200, 175, 300, 225, fill="blue", stipple="gray75")
    canvas.create_rectangle(200, 275, 300, 325, fill="blue", stipple="gray50")
    canvas.create_rectangle(200, 375, 300, 425, fill="blue", stipple="gray25")
    canvas.create_rectangle(200, 475, 300, 525, fill="blue", stipple="gray12")

def init(canvas):
    redrawAll(canvas)

########### copy-paste below here ###########

def run():
    # create the root and the canvas
    root = Tk()
    canvas = Canvas(root, width=500, height=600)
    canvas.pack()
    # Store canvas in root and in canvas itself for callbacks
    root.canvas = canvas.canvas = canvas
    # Set up canvas data and call init
    canvas.data = { }
    init(canvas)
    # set up events
    # root.bind("<Button-1>", mousePressed)
    # root.bind("<Key>", keyPressed)
    # timerFired(canvas)
    # and launch the app
    root.mainloop()  # This call BLOCKS (so your program waits until you close the window!)

run()

Answer 1

据我所知，点画从未在OSX上工作过--它可能在OS9下工作过，但直到2011年，这个问题还被讨论过，并在Tk8.5的OSX Tk stipple ticket discussion中标记为“已关闭，不会修复”

如果你看一下Tk 8.6的当前源代码，事情看起来仍然很严峻：

void *
TkMacOSXMakeStippleMap(
    Drawable drawable,      /* Window to apply stipple. */
    Drawable stipple)       /* The stipple pattern. */
{
    return NULL;
}

虽然我见过其他的Tk sources where this function is defined，但我不知道它们是否对应于任何官方版本。

这不仅仅是在OSX中实现点画的问题，他们似乎有一个问题，简单地记录点画在OSX中不起作用！