如何计算左上角（0,0）的距离？

Question

如果我在页面上有一些对象（图像）并且我知道它们的坐标，我该如何计算左上角的距离？

Answer 1

Is this any different than

1. subtracting the X coordinates, squaring the result
2. subtracting the Y coordinates, squaring the result
3. adding the two squares,
4. taking the square root?

In pseudo-code:

dx = xposition - xcorner
dy = yposition - ycorner
distance = sqrt((dx*dx ) + ( dy*dy))

Answer 2

You apply the Pythagorean Theorem from your high school trigonometry class. The distance from, say, (0, 0) to (55, 23) is the square root of ((55 x 55) + (23 x 23)) .