Problems drawing a Line in a Window

[thyslo]

I've some simple lines of BB2 Code to open a window on the Workbench screen and draw a line from its left top edge to ist bottom right edge:

WbToScreen 0
Window 0, 0, 12, 320, 240, $100f, "Use +/- key to resize.", 1, 2
Use Window 0
Line 0,0,320,240,1

Repeat
  VWait
  ev.l = Event
Until ev = $200

The window is opened and can be closed with the Close-gadget. But the line isn't drawn. I've already tried it with other pens like 2 or 3 instead of the '1' from above but that didn't work either.

What could be the problem?

[Honitos]

To draw in a window, use the command Wline instead of Line!

[thyslo]

Thank you, this works

So, one more question regarding (the formatting of) line drawing.

Currently I have this call:

  WLine X+xoffset1, Y+yoffset1, X+xoffset2, Y+yoffset2, X+xoffset3, Y+yoffset3, X+xoffset4, Y+yoffset4, X+xoffset1, Y+yoffset1, 1

If I break it like

  WLine X+xoffset1, Y+yoffset1,
        X+xoffset2, Y+yoffset2,
        X+xoffset3, Y+yoffset3,
        X+xoffset4, Y+yoffset4,
        X+xoffset1, Y+yoffset1, 1

the compiler won't build it, gives a Syntax Error instead. Is it somehow possible to break long lines like this?

[Honitos]

Yes, but only with AmiBlitz. The editor of BlitzBasic does not Support that.

With AmiBlitz you can separate lines by using the @@ operator like this:

Wline 10,10, @@
20,20

[thyslo]

Thank you!

And one last question. I have a main loop that is basically like this:

Repeat
  VWait
  ev.l = Event
Until ev = $200

And as expected it runs until the windows close gadget is pressed.

But I seem to get no keyboard input from the window. I've put this line before the VWait:

if InKey$ = "-" and R>20 then R = R - 1

And when I press the '-' key the value of R is not changed. How can I get keyboard input? Must I use the result of

Event

because I'm in a Intuition window?

[thyslo]

Ah I got it: it works when I put the InKey$ result in a variable first:

pressed_key$ = Inkey$
if pressed_key$ = "-" and R>20 then R = R - 1