video_editing_mouse.py 文件源码

def find_cut_and_handles_closest_to_mouse(mouse_x, mouse_y):
    """
    takes the mouse's coordinates in the sequencer area and returns the two strips
    who share the cut closest to the mouse, or the strip with the closest handle.
    Use it to find the handle(s) to select with the grab on the fly operator
    """
    view2d = bpy.context.region.view2d

    closest_cut = (None, None)
    distance_to_closest_cut = 1000000.0

    for s in bpy.context.sequences:
        channel_offset = s.channel + 0.5
        start_x, start_y = view2d.view_to_region(s.frame_final_start, channel_offset)
        end_x, end_y = view2d.view_to_region(s.frame_final_start, channel_offset)

        distance_to_start = calculate_distance(start_x, start_y, mouse_x, mouse_y)
        distance_to_end = calculate_distance(end_x, end_y, mouse_x, mouse_y)

        if distance_to_start < distance_to_closest_cut:
            closest_cut = (start_x, start_y)
            distance_to_closest_cut = distance_to_start
        if distance_to_end < distance_to_closest_cut:
            closest_cut = (end_x, end_y)
            distance_to_closest_cut = distance_to_end

    closest_cut_local_coords = view2d.region_to_view(closest_cut[0], closest_cut[1])
    frame, channel = round(closest_cut_local_coords[0]), floor(closest_cut_local_coords[1])
    return frame, channel