如何最好地从 tkinter canvas 转换坐标

Question

我有一个简单的坐标系，我想在 tkinter 上显示 canvas。当用户点击一个单元格时，我想打印出它的位置：

canvas上每个单元格的高和宽都是15，所以当用户点击一个单元格时，对应的事件并不是实际的x和y坐标。

我的想法是在 canvas:

上绘制不同高度和宽度的矩形

x1 = 0
x2 = 0
y1 = 15 
y2 = 15
for i in range(4):
    for i in range(8):
        canvas.create_rectangle(x1, x2, y1, y2, fill="blue",tags="playbutton", outline="green")
        x1 += 15
        y1 += 15
    x1 = 0
    y1 = 15
    x2 += 15
    y2 += 15

def clicked(*args):
    x = args[0].x
    y = args[0].y
    print(convert_to_coordinates(x,y)


canvas.tag_bind("playbutton","<Button-1>",clicked)

convert 函数看起来像这样：

def convert_to_coord(x,y):
   converted_x = None
   converted_y = None
   if x >= 0 and x <= 15:
       converted_x = "A"
   elif x > 15 and x <= 30:
       converted_x = "B"
   elif x > 30 and x <= 45:
       converted_x = "C"
   elif x > 45 and x <= 60:
       converted_x = "D"
   elif x > 60 and x <= 75:
       converted_x = "E"

   if y >= 0 and y <=15:
       converted_y = "1"
   elif y > 15 and y <= 30:
       converted_y = "2"
   elif y > 30 and y <= 45:
       converted_y = "3"
   elif y > 45 and y <= 60:
       converted_y = "4"

   return "{}{}".format(converted_x, converted_y)

我想知道是否有更好的方法来做到这一点？对我来说看起来有点笨重并且有很多硬编码值。

Answer 1

使用div运算符//

converted_y = y // 15 + 1
converted_x_idx = x // 15

并将converted_x_idx映射到带有列表或str的字母ABCDE之一。

Answer 2

为了减少硬编码的内容：

dx = 15 # this can be an optional argument of the convert function
xcells = ['A', 'B', 'C', 'D', 'E']
for jx, xcell in enumerate(xcells):
   if x > jx*dx and x <= (jx+1)*dx:
       converted_x = xcell
       break
if x == 0:
    converted_x = xcells[0]

ycells 当然也一样。

如何最好地从 tkinter canvas 转换坐标

How to best convert coordinates from tkinter canvas

python

tkinter

coordinates