ruby-sdl problem

[Javier 12]

Hi, I've been reading this introduction to rubysdl

(http://www.oreillynet.com/pub/a/ruby/2007/12/04/creating-games-in-ruby.html)

and wanted to try it.

My problem is the following:

irb(main):001:0> require "rubygems"
=> true
irb(main):002:0> require "sdl"
=> true
irb(main):004:0> SDL::init(SDL::INIT_VIDEO)
=> nil
irb(main):005:0> screen = SDL::Screen.open(640,480,24,SDL::SWSURFACE)
=> #<SDL::Screen:0x7fba2ba87798>
irb(main):006:0> image = SDL::Surface.load("humans.png")
NoMethodError: private method `load' called for SDL::Surface:Class
from (irb):5

How do I load an image?

Documentation extract:

SDL::Surface.load(filename)

Load image into an surface and returns surface object. If image
format supports transparent color, colorkey is set into new surfafe.

Supoorted formats are BMP, PNM (PPM/PGM/PBM), XPM, XCF, PCX, GIF,
JPEG, TIFF, TGA, PNG and LBM.

Raises SDL::Error on failure

You need SDL_image to use this method.


*******************************
gem list --local rubysdl

*** LOCAL GEMS ***

rubysdl (2.1.1)

 

[Jakub Pavlik jn.]

Hi, I've been reading this introduction to rubysdl

(http://www.oreillynet.com/pub/a/ruby/2007/12/04/creating-games-in-ruby.html)

and wanted to try it.

My problem is the following:

irb(main):001:0> require "rubygems"
=> true
irb(main):002:0> require "sdl"
=> true
irb(main):004:0> SDL::init(SDL::INIT_VIDEO)
=> nil
irb(main):005:0> screen = SDL::Screen.open(640,480,24,SDL::SWSURFACE)
=> #<SDL::Screen:0x7fba2ba87798>
irb(main):006:0> image = SDL::Surface.load("humans.png")
NoMethodError: private method `load' called for SDL::Surface:Class
from (irb):5

How do I load an image?

Documentation extract:

SDL::Surface.load(filename)

Load image into an surface and returns surface object. If image
format supports transparent color, colorkey is set into new surfafe.

Supoorted formats are BMP, PNM (PPM/PGM/PBM), XPM, XCF, PCX, GIF,
JPEG, TIFF, TGA, PNG and LBM.

Raises SDL::Error on failure

You need SDL_image to use this method.


*******************************
gem list --local rubysdl

*** LOCAL GEMS ***

rubysdl (2.1.1)

Hi,
would suggest looking at
http://www.kmc.gr.jp/~ohai/rubysdl.en.html
which seems to be official web of the library, maintained by it's
developer(s).

I looked quickly into the documentation and haven't found method
Surface.load - which, of course, probably means I haven't searched good
enough.

When I had to solve problems with some "SDL for Ruby" library, it was often caused by problems with compilation - e.g. I didn't have SDL_image library installed on my system or the make script wasn't able to find it when compiling the Ruby port. Have you checked this?
(E.g. RUDL and Rubygame can be compiled with minimum of SDL libraries -
but don't offer some classes and/or methods then...)

Jakub

P.S.: I myself don't like Ruby/SDL very much and use Rubygame or even
ancient unmaintained RUDL instead, but you probably know why you want to
use the SDL port you have chosen...