Grid in half of x-axis and y-axis distance
I'd like to have a radio-button in the grid menu, that sets the grid automatically to half the values of the distances of x-axis respectively the y-axis.
Distance x-axis 10, y-axis 2
grid x-axis 5, y-axis 1
Distance x-axis pi/2, y-axis 1
grid axis pi/4, y-axis 0.5