"dir" - mkraska/meclib GitHub Wiki
[ "dir", "name", [x,y], angle, offset, length]
small arrow with label (indication of coordinate axes).
"name"
label, typeset in MathJax math mode[x,y]
start pointangle
arrow direction, counter-clockwise from x-axis, in °.offset
(optional, defaults to 10 pixels) distance from arrow to text anchor point in pixels. Ifoffset
< 0, then the label is placed at the tail of the arrow, otherwise at the head.length
(optional, defaults to equivalent of 24 pixels), in standard grid units
[
[ "grid", "","", -5,5,-4,5, 50, [1,1], [0,0] ],
[ "point", "P", [2,1] ],
[ "angle1", "\\alpha", [2, 1], [3,1], 0.7, 45 ],
[ "dir", "a", [2,1], 45, 10, 1],
[ "dim", "\\ell", [2,1], [2.707,1.707], 0.5],
[ "dir", "v", [-2,1], 45, -10, 1],
[ "dir", "a_n", [-0.8,1], 45, 10, 1],
[ "label", "offset < 0", [-2,2.2]],
[ "label", "offset > 0", [-0.5,2.2]]
]