Touch Screen Calibration is a Touch Tricky on Round Displays!

[StephenDone]

Describe the bug
The corners of the round screen are hard to press :-)

Expected behavior
Red squares within the screen extents when the display is round.

Images

Thoughts
You could perhaps have an optional parameter to the calibrate() method 'round=False'

Here's some code I wrote to place 3 squares around the radius of a round display in touch_calibrate.py...

def calibrate(indev, cal_data):

    if not task_handler.TaskHandler.is_running():
        th_running = False
        task_handler.TaskHandler()
    else:
        th_running = True

    width = indev._orig_width  # NOQA
    height = indev._orig_height  # NOQA

    # coords = [
    #     [20, 20],  # upper left
    #     [width - 40, 20],  # upper right
    #     [20, height - 40]  # lower left
    # ]
    # target_points = [
    #     dict(x=30, y=30),  # upper left
    #     dict(x=width - 30, y=30),  # upper right
    #     dict(x=30, y=height - 30),  # lower left
    # ]

    from math import sin, cos, radians, floor

    radius = width // 2
    opposite = floor( sin(radians(30)) * (radius-30) )
    adjacent = floor( cos(radians(30)) * (radius-30) )

    coords = [
        [radius            -10,                     20],  # upper left
        [radius - adjacent -10, radius + opposite - 10],  # upper right
        [radius + adjacent -10, radius + opposite - 10]  # lower left
    ]

    target_points = [
        dict(x=radius,          y=30),  # upper middle
        dict(x=radius-adjacent, y=radius+opposite),  # upper right
        dict(x=radius+adjacent, y=radius+opposite),  # lower left
    ]

    captured_points = [
        dict(x=[], y=[]),
        dict(x=[], y=[]),
        dict(x=[], y=[])
    ]

    old_scrn = lv.screen_active()  # NOQA
    ...