rt_raster_set_phys_params()

void rt_raster_set_phys_params	(	rt_raster	rast,
		double	i_mag,
		double	j_mag,
		double	theta_i,
		double	theta_ij
	)

Calculates the geotransform coefficients and applies them to the supplied raster.

The coefficients will not be applied if there was an error during the calculation.

This method affects only the scale and skew coefficients. The offset parameters are not changed.

Parameters

rast	the raster in which the geotransform will be stored.
i_mag	size of a pixel along the transformed i axis
j_mag	size of a pixel along the transformed j axis
theta_i	angle by which the raster is rotated (radians positive clockwise)
theta_ij	angle from transformed i axis to transformed j axis (radians positive counterclockwise)

Definition at line 301 of file rt_raster.c.

{
    double o11, o12, o21, o22 ; /* calculated geotransform coefficients */
    int success ;
 
    if (rast == NULL) return ;
 
    success = rt_raster_calc_gt_coeff(i_mag, j_mag, theta_i, theta_ij,
                            &o11, &o12, &o21, &o22) ;
 
    if (success) {
        rt_raster_set_scale(rast, o11, o22) ;
        rt_raster_set_skews(rast, o12, o21) ;
    }
}

References rtpixdump::rast, return(), rt_raster_calc_gt_coeff(), rt_raster_set_scale(), and rt_raster_set_skews().

Referenced by RASTER_setGeotransform(), and RASTER_setRotation().

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