OpenEuphoria

2. Re: Mouse and graphics

• Posted by Undetermined origin c/o LISTSERV administrator Aug 06, 2000
• 365 views

Paul Kerslake wrote:

> I'd like to thank you all for giving me some help. But, it seems the deeper
> into Euphoria I get, the more problems I get. There's a Genisis song I'd
> contribute to programming, that song being Land of Confusion!  But, hey, I'm new
> so, that's probably normal.
>
> Here's are the new problems:
>
> Is there some way of using get_mouse() and converting it into a sequence so I
> can use it in things like position or draw_line?
> eg:
>
> include mouse.e
> include graphics.e
>
> integer junk
> object mouse
> junk=graphics_mode(18)
> while get_key()=-1 do
> mouse = get_mouse()
> if sequence(mouse)  then
> if mouse[1] = LEFT_DOWN then
> puts(1, "You left clicked yourr mouse at: " & sprintf("%3d",mouse[2]) & "," &
> sprintf("%3d\n", mouse[3]))
>
> elsif mouse[1] = RIGHT_DOWN then
> draw_line(mouse[2],mouse[3])
> end if
>  end if
> end while

For a line, you need at least 2 points. get_mouse only returns the point where
the mouse is. Here's an example which should draw a line between two or more
clicks:
integer junk
object prev_mouse, mouse
prev_mouse = 0
while get_key() = -1 do
    mouse = get_mouse()
    if sequence(mouse) then
        if mouse[1] = LEFT_DOWN then
            if integer(prev_mouse) then
                prev_mouse = mouse[2..3]
            else
                draw_line(WHITE,{mouse[2..3],prev_mouse})
                prev_mouse = mouse[2..3]
            end if
        end if
    end if
end while

> This would result in a program (or something) that, when a mouse button is
> clicked, a line is drawn at it's co-ords.
>
> Here's a biggie: I know how to make a program that can move an image (text or
> bitmap) around the screen using the arrow keys (or any other key fot that
> matter), but, how can I have frames?
>
> e.g.
> Having a bitmap of a space-ship  and, when it moves, animate the fire coming
> out the back.
> (Gee, can we tell what kind of programs I'm going for?)

What exactly do you mean? I mean, are you wondering about blitting the images to
the screen or timing the frames of an animation or what?

Jeffrey Fielding
JJProg at cyberbury.net