From: shawn bright <nephish@...>
Date: 2008-02-07T00:47:20+09:00
Subject: Re: question about transparent image RMAGIK

fill_opacity was what i was looking for,
thanks very much.

shawn

On Feb 6, 2008 9:27 AM, Tim Hunter <rmagick@gmail.com> wrote:
> Shawn Bright wrote:
> > Hello there all,
> > i have a simple function to draw an image, but i cannot for the life
> > of me figgure out from the docs how to make it about 20% transparent.
> >
> >  def circle_image(zoom)
> >     site = self.site
> >      zoomhash = {13 => 0.5, 14 => 1, 15 => 2, 16 => 4}
> >     r = (self.radius.to_f * zoomhash[zoom.to_i].to_f)
> >     canvas = Magick::Image.new((2 * r), (2*r),
> > Magick::HatchFill.new('transparent', 'transparent'))
> >     gc = Magick::Draw.new
> >     # for the outside perimeter of the circle
> >     gc.stroke('black')
> >     gc.stroke_width(1)
> >     # fill in the inside
> >     color = KeyWord.stat_description(site.status_sensor.last_value)[1]
> >     gc.fill(color)
> >     gc.circle(r, r, 0, r)
> >     image = gc.draw(canvas)
> >     canvas.write("public/images/tmp/#{site.id}.png")
> >   end
> >
> > please help, thanks
> >
> > shawn
>
> Do you want to make the entire image 20% transparent? Use the
> Image#opacity= attribute
> [http://studio.imagemagick.org/RMagick/doc/imageattrs.html#opacity].
>
> Do you want to make the drawing 20% transparent so that the drawn-upon
> image shows through? See the Draw#stroke_opacity
> [http://studio.imagemagick.org/RMagick/doc/draw.html#stroke_opacity] and
> Draw#fill_opacity
> [http://studio.imagemagick.org/RMagick/doc/draw.html#fill_opacity]
> methods.
>
> Also check out the example drawing here
> [http://studio.imagemagick.org/RMagick/doc/usage.html#drawing_on].
> --
> Posted via http://www.ruby-forum.com/.
>
>