我运行这个示例code在Windows和OS X上测试stipple
,但结果不同。怎么回事?在
# 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()
据我所知,点画从来没有在OSX上工作过——它可能在OS9下工作过,但就在2011年,这个问题被讨论过,并在TK8.5的OSX Tk stipple ticket discussion中标记为“关闭,不会修复”
如果你看一下TK8.6的当前来源,情况仍然不容乐观:
虽然我看过其他的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。在
这不仅仅是在OSX中实现点画的问题,他们似乎有一个问题,就是简单地记录点画在OSX中不起作用!在
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