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# A platform-dependent image that can be drawn on the screen
class Wx::Bitmap
# Allow wxRuby to guess the type of an image file from its extension.
BITMAP_TYPE_GUESS = {
'bmp' => Wx::BITMAP_TYPE_BMP,
'gif' => Wx::BITMAP_TYPE_GIF,
'ico' => Wx::BITMAP_TYPE_ICO,
'jpeg' => Wx::BITMAP_TYPE_JPEG,
'jpg' => Wx::BITMAP_TYPE_JPEG,
'pbm' => Wx::BITMAP_TYPE_PNM,
'pcx' => Wx::BITMAP_TYPE_PCX,
'pgm' => Wx::BITMAP_TYPE_PNM,
'png' => Wx::BITMAP_TYPE_PNG,
'pnm' => Wx::BITMAP_TYPE_PNM,
'ppm' => Wx::BITMAP_TYPE_PNM,
'tga' => Wx::BITMAP_TYPE_TGA,
'tif' => Wx::BITMAP_TYPE_TIF,
'tiff' => Wx::BITMAP_TYPE_TIF,
'xbm' => Wx::BITMAP_TYPE_XBM,
'xpm' => Wx::BITMAP_TYPE_XPM
}
# Constructor copying data from an image
def self.from_image(img, depth = -1)
new(img, depth)
end
# Ruby methods that switch class are conventionally named to_foo
alias :to_image :convert_to_image
# Redefine the initialize method so it raises an exception if a
# non-existent file is given to the constructor; otherwise, wx Widgets
# just carries on with an empty bitmap, which may cause faults
# later. Also, be helpful and try to guess the bitmap type from the
# filename if it's not specified
wx_init = self.instance_method(:initialize)
define_method(:initialize) do | *args |
# If creating from a file, check it exists
if args[0].kind_of? String
if not File.exist?( File.expand_path(args[0]) )
Kernel.raise(ArgumentError, "Bitmap file does not exist: #{args[0]}")
end
# If type not specified, try to guess it from the file extension
if not args[1] and file_ext = args[0][/\w+$/]
args[1] = BITMAP_TYPE_GUESS[file_ext.downcase]
end
end
wx_init.bind(self).call(*args)
end
# Accepts a block, which will be passed a device context which can be
# used to draw upon the Bitmap
def draw
dc = Wx::MemoryDC.new
dc.select_object(self)
yield dc
dc.select_object( Wx::NULL_BITMAP )
end
end
Version data entries
17 entries across 17 versions & 3 rubygems