Method: Magick::Image#change_geometry

Defined in:
ext/RMagick/rmimage.cpp

#change_geometry(geom_arg) {|column, row, image| ... } ⇒ Object

Note:

#change_geometry! is an alias for #change_geometry.

This method supports resizing a method by specifying constraints. For example, you can specify that the image should be resized such that the aspect ratio should be retained but the resulting image should be no larger than 640 pixels wide and 480 pixels tall.

Examples:

image.change_geometry!('320x240') { |cols, rows, img|
  img.resize!(cols, rows)
}

Parameters:

Yields:

  • (column, row, image)

Yield Parameters:

  • column (Integer) —

    The desired column size

  • row (Integer) —

    The desired row size

  • image (Magick::Image) —

    self

See Also:



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# File 'ext/RMagick/rmimage.cpp', line 2349

VALUE
Image_change_geometry(VALUE self, VALUE geom_arg)
{
    Image *image;
    RectangleInfo rect;
    VALUE geom_str;
    char *geometry;
    unsigned int flags;
    VALUE ary;

    image = rm_check_destroyed(self);
    geom_str = rb_String(geom_arg);
    geometry = StringValueCStr(geom_str);

    memset(&rect, 0, sizeof(rect));

    SetGeometry(image, &rect);
    flags = ParseMetaGeometry(geometry, &rect.x, &rect.y, &rect.width, &rect.height);
    if (flags == NoValue)
    {
        rb_raise(rb_eArgError, "invalid geometry string `%s'", geometry);
    }

    ary = rb_ary_new2(3);
    rb_ary_store(ary, 0, ULONG2NUM(rect.width));
    rb_ary_store(ary, 1, ULONG2NUM(rect.height));
    rb_ary_store(ary, 2, self);

    RB_GC_GUARD(geom_str);
    RB_GC_GUARD(ary);

    return rb_yield(ary);
}