I use
dc = DC.new()
dc.draw_line(50, 50, 100, 100)
but it can’t be compiled
I don’t know how to declare DC variable??
in http://wxruby.rubyforge.org/doc/dc.html
it don’t tell me how to declare now variable
plese tell me 
Hello Bass Guitar,
Unfortunately, you cannot instantiate the DC (Device Context) directly
from
the DC Class. You need to utilize Window#draw or Window#paint to create
a
DC. The difference between these two methods, is that when you are in a
paint event (EG: evt_paint), you utilize the Window#paint method to
acquire
a Device Context. When your outside of the paint event, you utilize
Window#draw to acquire the Device Context.
An Example of inside an paint event would be this:
evt_paint() do
self.paint do |dc|
dc.draw_line(50, 50, 100, 100)
end
end
And an example of how to draw outside of a paint event:
def run_draw()
self.draw do |dc|
dc.draw_line(50, 50, 100, 100)
end
end
Once you implement this, it will work.
L8ers,
Mario S.
Mario S. wrote:
Unfortunately, you cannot instantiate the DC (Device Context) directly
from the DC Class. You need to utilize Window#draw or Window#paint to
create a DC. The difference between these two methods, is that when
you are in a paint event (EG: evt_paint), you utilize the Window#paint
method to acquire a Device Context. When your outside of the paint
event, you utilize Window#draw to acquire the Device Context.
Just a quick follow-up; Mario’s quite right that you use the
Window#paint method to acquire a DeviceContext to do drawing. It is
recommended that this is within an evt_paint handler which means that
drawing will only be done when necessary. The sample image/images.rb is
probably the simplest example to look at.
However, there isn’t a “draw” method as far as I know. “paint” is used
in all circumstances, but the exact type of DC will be different
dependent on the, um, context. But there will be no functional
difference
hth
alex
thank you 