使用 Python 在图像上使用角度和中心点绘制一条线

Question

I'm facing a little issue in my code. I have a dataframe of coords and angels. I want to draw a line from a certain xy coords to the edge of the image on a certain angle (say 45 degree).

How can I do that using PIL? Looping over x2 = x + length*cos(angle) doesn't look like a good solution (but I might be wrong here).

Thanks in advance.

Answer 1

Thanks for posting your solution. I've found a good one.

import math

def get_coords(x, y, angle, imwidth, imheight):

    x1_length = (x-imwidth) / math.cos(angle)
    y1_length = (y-imheight) / math.sin(angle)
    length = max(abs(x1_length), abs(y1_length))
    endx1 = x + length * math.cos(math.radians(angle))
    endy1 = y + length * math.sin(math.radians(angle))

    x2_length = (x-imwidth) / math.cos(angle+180)
    y2_length = (y-imheight) / math.sin(angle+180)
    length = max(abs(x2_length), abs(y2_length))
    endx2 = x + length * math.cos(math.radians(angle+180))
    endy2 = y + length * math.sin(math.radians(angle+180))

    return endx1, endy1, endx2, endy2

Then I just draw a line between (endx1, endy1) and (endx2, endy2).

If you have a better solution, I would be very interested to see it.