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/*
* rectilinear (pinhole) projection model with distortion correction
*/
/* switch to cartesian coordinates */
c_x : cos(m_nick) * cos(m_view - c_view)$
c_y : cos(m_nick) * sin(m_view - c_view)$
c_z : sin(m_nick)$
/* nick rotation */
c_x_rot : cos(c_nick) * c_x + sin(c_nick) * c_z$
c_y_rot : c_y$
c_z_rot : -sin(c_nick) * c_x + cos(c_nick) * c_z$
/* pinhole projection */
x : c_y_rot / c_x_rot$
y : -c_z_rot / c_x_rot$
/* rotation around view axis */
x_rot : y * sin(c_tilt) + x * cos(c_tilt) + x0$
y_rot : y * cos(c_tilt) - x * sin(c_tilt)$
/* distortion correction */
d : x_rot ^ 2 + y_rot ^ 2$
dist_fact : d ^ 2 * k1 + d * k0$
x_dist : x_rot * (1 + dist_fact) * scale$
y_dist : y_rot * (1 + dist_fact) * scale$
/*
* Some mangling for C code generation
*/
load("expr2c.mac")$
x_expand : trigexpand(x_dist)$
y_expand : trigexpand(y_dist)$
args: "double c_view, double c_nick, double c_tilt, double scale, double k0, double k1, double x0, double m_view, double m_nick"$
expr2c("ProjectionRectilinear::mac_x", args, x_expand)$
expr2c("ProjectionRectilinear::mac_y", args, y_expand)$
expr2c("ProjectionRectilinear::mac_x_dc_view", args, diff(x_expand, c_view))$
expr2c("ProjectionRectilinear::mac_x_dc_nick", args, diff(x_expand, c_nick))$
expr2c("ProjectionRectilinear::mac_x_dc_tilt", args, diff(x_expand, c_tilt))$
expr2c("ProjectionRectilinear::mac_x_dscale", args, diff(x_expand, scale))$
expr2c("ProjectionRectilinear::mac_x_dk0", args, diff(x_expand, k0))$
expr2c("ProjectionRectilinear::mac_x_dk1", args, diff(x_expand, k1))$
expr2c("ProjectionRectilinear::mac_x_dx0", args, diff(x_expand, x0))$
expr2c("ProjectionRectilinear::mac_y_dc_view", args, diff(y_expand, c_view))$
expr2c("ProjectionRectilinear::mac_y_dc_nick", args, diff(y_expand, c_nick))$
expr2c("ProjectionRectilinear::mac_y_dc_tilt", args, diff(y_expand, c_tilt))$
expr2c("ProjectionRectilinear::mac_y_dscale", args, diff(y_expand, scale))$
expr2c("ProjectionRectilinear::mac_y_dk0", args, diff(y_expand, k0))$
expr2c("ProjectionRectilinear::mac_y_dk1", args, diff(y_expand, k1))$
expr2c("ProjectionRectilinear::mac_y_dx0", args, diff(y_expand, x0))$
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