如何将 Tkinter 画布坐标转换为窗口坐标？

发布于 2024-12-10 08:38:16 字数 157 浏览 0 评论 0原文

有没有办法在 Tkinter 中将画布坐标转换为窗口坐标？

这与从窗口坐标转换为画布坐标相反，其操作如下：

x = canvas.canvasx(event.x)

原文

Is there a way to convert canvas coordinates to window coordinates in Tkinter?

It would be the opposite of converting from window to canvas coordinate, which is done like this:

x = canvas.canvasx(event.x)

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心在旅行 2024-12-17 08:38:16

使用 canvasx 和 canvasy 方法（参数为零）来计算可见画布左上角的 x/y。然后只需使用数学将画布坐标转换为相对于窗口的坐标即可。

# upper left corner of the visible region
x0 = self.canvas.canvasx(0)
y0 = self.canvas.canvasy(0)

# given a canvas coordinate cx/cy, convert it to window coordinates:
wx0 = cx-x0
wy0 = cy-y0

例如，如果画布一直滚动到顶部和左侧，则 x0 和 y0 将为零。您给出的任何画布坐标都将与窗口坐标相同（即：0,0 的画布 x/y 将对应于窗口坐标 0,0）。

如果您向下向右滚动 100 个像素，则画布坐标 100,100 将转换为窗口坐标 0,0，因为该像素位于窗口的左上角。

这将为您提供相对于画布左上角的值。如果您需要相对于整个窗口的左上角，请使用 winfo_x 和 winfo_y 获取画布相对于窗口的坐标并进行更多数学运算。或者，使用 winfo_rootx 和 winfo_rooty 获取小部件相对于屏幕的坐标。

Use the canvasx and canvasy methods, giving an argument of zero, to compute the x/y of the upper left corner of the visible canvas. Then just use math to convert the canvas coordinate to something relative to the window.

# upper left corner of the visible region
x0 = self.canvas.canvasx(0)
y0 = self.canvas.canvasy(0)

# given a canvas coordinate cx/cy, convert it to window coordinates:
wx0 = cx-x0
wy0 = cy-y0

For example, if the canvas is scrolled all the way to the top and left, x0 and y0 will be zero. Any canvas coordinate you give will be the same as the window coordinate (ie: canvas x/y of 0,0 will correspond to window coordinate 0,0).

If you've scrolled 100 pixels down and to the right, a canvas coordinate of 100,100 will translate to a window coordinate of 0,0 since that is the pixel that is in the upper left corner of the window.

This gives you a value relative to the upper left corner of the canvas. If you need this relative to the upper left corner of the whole window, use winfo_x and winfo_y to get the coordinate of the canvas relative to the window and do a little more math. Or, use winfo_rootx and winfo_rooty to get the coordinates of the widget relative to the screen.

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