Programming and Graphics

9.4 Transferring data to theMatlabdomain 303

− 1

−0.5

0

0.5

(^1) − 1

0

− 1 1

−0.5

0

0.5

1

y

x

z

Figure 9.4.3 Drawing of a sphere generated byMatlabthrough C++ code.

//--- Finish the session:

cout << "Hit return to continue\n";

fgetc(stdin);

return 0;

}

Figure 9.4.3 shows the generated graphics display.

Note that the C++ data matrixz[Nt+1][Np+1]is passed toMatlabas
an (Np+1)×(Nt+ 1) matrix using the statement:

mxArray * zz = mxCreateDoubleMatrix(Np+1, Nt+1, mxREAL);

Animation of a bouncing circle

The following code contained in the fileanimation.ccanimates the motion
of a bouncing circle inside a square box. When the center of the circle hits one
of the boundaries, the motion is reflected by switching the sign of the horizontal
or vertical velocity.