Mohr's Circle

The student can move the circle and the line for the 1-axis using the red points. This is done using the special purpose objects "circle2p" and "line2p". They return their point co-ordinates in the names input field.

f:50;
initdata: [ 
  [ "grid", " ", " ", -6,6, -3, 3, 40, [f,f] ],
  [ "circle2p", "P","P'", [50,50],[100,100], f ],
  [ "line2p", "1-Achse", [200,100],[250,50], f ]
];
init: stackjson_stringify(float(initdata));

tansdata: [ 
  [ "grid", " ", " ", -6,6, -3, 3, 40, [f,f] ],
  [ "circle2p", "P","P'", [50,50],[100,100], f ],
  [ "line2p", "1-Achse", [200,100],[250,50], f ]
];
tans: stackjson_stringify(float(tansdata));

In order to check the points P and P' and the slope of the line, you might use the following in the feedback variables. Note that this relies on object position in the list.

S_P: names[2][1];
S_PP: names[2][2];
[dx,dy]: names[3][2]-names[3][1];

One could extract the co-ordinates from objects as well by object name, but in with that few objects it can be kept simple.