Method: Magick::Image#units=

Defined in:
ext/RMagick/rmimage.cpp

#units=(restype) ⇒ Magick::ResolutionType

Set the units of image resolution.

Parameters:

  • restype (Magick::ResolutionType) —

    the resolution type

Returns:

  • (Magick::ResolutionType) —

    the given value



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# File 'ext/RMagick/rmimage.cpp', line 15158

VALUE
Image_units_eq(VALUE self, VALUE restype)
{
    ResolutionType units;
    Image *image = rm_check_frozen(self);

    VALUE_TO_ENUM(restype, units, ResolutionType);

    if (image->units != units)
    {
        switch (image->units)
        {
            case PixelsPerInchResolution:
                if (units == PixelsPerCentimeterResolution)
                {
#if defined(IMAGEMAGICK_7)
                    image->resolution.x /= 2.54;
                    image->resolution.y /= 2.54;
#else
                    image->x_resolution /= 2.54;
                    image->y_resolution /= 2.54;
#endif
                }
                break;

            case PixelsPerCentimeterResolution:
                if (units == PixelsPerInchResolution)
                {
#if defined(IMAGEMAGICK_7)
                    image->resolution.x *= 2.54;
                    image->resolution.y *= 2.54;
#else
                    image->x_resolution *= 2.54;
                    image->y_resolution *= 2.54;
#endif
                }
                break;

            default:
                // UndefinedResolution
#if defined(IMAGEMAGICK_7)
                image->resolution.x = 0.0;
                image->resolution.y = 0.0;
#else
                image->x_resolution = 0.0;
                image->y_resolution = 0.0;
#endif
                break;
        }

        image->units = units;
    }

    return restype;
}