rt_raster_pixel_as_centroid_point()

LWPOINT * rt_raster_pixel_as_centroid_point	(	rt_raster	rast,
		int	x,
		int	y
	)

Get a raster pixel centroid point.

Parameters

raster	: the raster to get pixel from
x	: the column number
y	: the row number

Returns

the pixel centroid point, or NULL on error.

Definition at line 669 of file rt_geometry.c.

{
    double scale_x, scale_y;
    double skew_x, skew_y;
    double ul_x, ul_y;
    int32_t srid;
    double center_x, center_y;
    LWPOINT* point;
 
    scale_x = rt_raster_get_x_scale(rast);
    scale_y = rt_raster_get_y_scale(rast);
    skew_x = rt_raster_get_x_skew(rast);
    skew_y = rt_raster_get_y_skew(rast);
    ul_x = rt_raster_get_x_offset(rast);
    ul_y = rt_raster_get_y_offset(rast);
    srid = rt_raster_get_srid(rast);
 
    center_x = scale_x * x + skew_x * y + ul_x + (scale_x + skew_x) * 0.5;
    center_y = scale_y * y + skew_y * x + ul_y + (scale_y + skew_y) * 0.5;
    point = lwpoint_make2d(srid, center_x, center_y);
 
    return point;
}

References lwpoint_make2d(), rt_raster_get_srid(), rt_raster_get_x_offset(), rt_raster_get_x_scale(), rt_raster_get_x_skew(), rt_raster_get_y_offset(), rt_raster_get_y_scale(), and rt_raster_get_y_skew().

Referenced by RASTER_getPixelCentroids().

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