Shiv Shankar Dayal schrieb am 28.08.2024 um 12:23:
I don't know where you found the code, but the answer to "What is (0,
r) rotated (a *i) doing?" is that it takes the point (0,r) and rotates
it a*i degrees.
I do not understand the concept of rotating a point. It is rotated with respect
to what reference?
You rotate around a point with the x and y coordinates 0.
The blue dot shows the point with the coordinates 0. The green dot is
rotated around this point.
\starttext
\startMPcode
drawdot (0,0) withpen pencircle scaled 5mm withcolor blue;
draw fullsquare scaled (4cm) withcolor red;
\stopMPcode
\startMPcode
drawdot (0,0) withpen pencircle scaled 5mm withcolor blue;
drawdot (1.5cm,0) withpen pencircle scaled 5mm withcolor green;
draw fullsquare scaled (4cm) withcolor red;
\stopMPcode
\startMPcode
drawdot (0,0) withpen pencircle scaled 5mm withcolor blue;
drawdot (1.5cm,0) rotated (30) withpen pencircle scaled 5mm withcolor green;
draw fullsquare scaled (4cm) withcolor red;
\stopMPcode
\startMPcode
drawdot (0,0) withpen pencircle scaled 5mm withcolor blue;
drawdot (1.5cm,0) rotated (60) withpen pencircle scaled 5mm withcolor green;
draw fullsquare scaled (4cm) withcolor red;
\stopMPcode
\startMPcode
drawdot (0,0) withpen pencircle scaled 5mm withcolor blue;
drawdot (1.5cm,0) rotated (90) withpen pencircle scaled 5mm withcolor green;
draw fullsquare scaled (4cm) withcolor red;
\stopMPcode
\stoptext
Wolfgang
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