Processing - Set X/Y Zero Coordinates To Center of Display Window

Question

I'm trying to use latitude and longitude coordinates to plot a map in Processing. Is there a way to set the zero coordinates of the X and Y axis to the center of the display window.

Or does anyone know how to convert spherical coordinates to cartesian?

Thanks

Answer 1

I'll assume you have spherical coordinates of r, radius; theta, horizontal angle around Z-axis starting at (1,0,0) and rotating toward (0,1,0); and phi, vertical angle from positive Z-axis toward negative Z-axis; that being how I remember it from back when. Remember that angles are in radians in most programming languages; 2*pi radians = 180 degrees.

x = r * cos(theta) * sin(phi)
y = r * sin(theta) * sin(phi)
z = r * cos(phi)