.. page-title: Box example: wheatstone.box wheatstone.box ============== A simple electric circuit ------------------------- .. figure:: wheatstone.png :align: center the output produced by Box To run this example you will need the following file(s): `./wheatstone.box <./wheatstone.box>`__. If the example requires more than one file, then you should put them into the same directory. You can then launch Box with ``box -l g ./wheatstone.box``. .. raw:: html

   // Under a shell type: box wheatstone.box -l g
   // ---
   // This example shows how to use Window.Put to place figures.
   
   include "g"
   include "electric"
   
   // This is not a real Wheatstone bridge.
   // We replace some of the resistors with other components, just to make
   // the thing more interesting!
   wheatstone = Window["fig"][
     d1 = 20.0 // d1 = half diagonal
     p1 = (0, -d1), p2 = (d1, 0), p3 = (0, d1), p4 = (-d1, 0)
   
     // Places the four components.
     // Each component has two connections. Here we want to rotate and translate
     // ("rt") a resistor such that the first of its terminals is near to
     // the point p1 and the second one is near to p2.
     r12 = .Put[resistor, "rt", .Near[1, p1], .Near[2, p2]]
     // We proceed in a similar way for the other components:
     r23 = .Put[diode, "rt", .Near[1, p2], .Near[2, p3]]
     r34 = .Put[inductance, "rt", .Near[1, p3], .Near[2, p4]]
     r41 = .Put[resistor, "rt", .Near[1, p4], .Near[2, p1]]
   
     // Connecting the four resistors
     \ .Line[0.4, p1, r12.Get[1]; r12.Get[2], p2; p2, r23.Get[1]; r23.Get[2], p3;
             p3, r34.Get[1]; r34.Get[2], p4; p4, r41.Get[1]; r41.Get[2], p1]
   
     // Drawing small circles on the nodes
     // Here you see how a single Circle instruction can be used to draw many
     // circles. To start a new circle one should use the separator ";" and
     // specify only the quantities that changed with respect to the previous
     // circle. Here we change only the center, so we need to specify the radius
     // only once!
     \ .Circle[0.8, p1; p2; p3; p4]
   
     .Save["wheatstone.eps"]  // Saving to eps file
   ]