forums.silverfrost.com

[DanRRight]

Noticed that while I made windows resizable the first two windows' surprisingly lost the ability to plot (display_bar and control_panel)? This may take some more swearing to find why.

[John-Silver]

Hi Dan,
I'm catching up here.
When I run your code (v8.1+dlls23) all the windows initially give me graphics but after I re-size (which works ok) for any of the 4 windows the graphics disappear.
This is not surprising as the callback 'empty' does nothing.
Even though it says the call to the callback should auto-redraw I tried adding this to the callback 'empty', but still nothing appears when I resixìze the 'simulation' wndow ...

[DanRRight]

Hell knows, way to many options to try. Needs more swearing time. This is why i use word 'devilry' too often.

[John-Silver]

Forget what I said above, it works (after a fashion -see below) albeit that you need also to add a include 'windows.ins' at the top of the function too.
I had inadvertently omitted it, not seen that the compile failed, and had been re-running a previous version ! doh !)

Replace the callback function in your code Dan with this:-

integer function empty ()
include <windows.ins>
call draw_filled_rectangle@(10,10,200,200,rgb@(125,125,125))
call draw_filled_ellipse@(175,175,60,90,rgb@(127,59,30))
empty=0
end function

This is a 'quick-n-dirty' demonstration because as it stands this same call-back is invoked for each of the 3
graphics areas.

In reality the contents of each window should be specified in 3 seperate call-back as required

The modified full code below does that, and all the windows now resize and the 'simulation' window now re-sizes with the original contents in it.

However (isn't there always one !) the other windows, when re-sized, go blank and their graphic content is re-drawn always in the 'simulation' window !!!

It seems to be hanging onto the last created graphics region handle rather than using the one from which the callback is made.

__________________________________________________

A more general question for Paul is what does re-sizing actually mean ?

%pv description says the control (in this case the %gr) can be re-sized, but in fact it only allows the window in which it is contained to be re-sized and the %gr remains the same size.

However, the %pl control re-sizes (scales) when it's in a window and the window is re-sized.

Confusing man.

Full modified code to follow ........
_________________
''Computers are incredibly rigid. They question nothing. Especialy input data.Human beings are incredibly trusting of computers and don't check input data. Together they are capable of cocking up even the simplest calculation ... "

[John-Silver]

here it is .....

[John-Silver]

I jut printed out the values of: control_panel, display_bar, simulation
and they're ALL ZERO ! which maybe explains why all graphics updates go to the last created window ?

Paul are you sure a correct value is output from %gr ?
_________________
''Computers are incredibly rigid. They question nothing. Especialy input data.Human beings are incredibly trusting of computers and don't check input data. Together they are capable of cocking up even the simplest calculation ... "

[DanRRight]

I took your contribution and now it plots on each screen but still does not work right.

Why handle for each of 3 graphics windows are all the same is a good question. Due to that every time we click on any window the plotting goes to the last screen instead the current one

Here is what i changes in your code:

1) each callback calls select_graphics_object@ function before doing any drawings. And

2) the callback does have value 2 not zero at the end, this is default for Clearwin+ . Zero might be used if you want to close window on any click on it

3) i removed "implicit none" as it made me nuts and swear louder very quickly asking to declare each and every damn junk variable i introduce like i44 in each and every subroutine. Or requiring to declare each variable in common blocks in all these Functions. To avoid that requires using modules but modules have another bad property: when your code will grow one big module will eventually swallow all others making one huge monopoly which has nothing more but die

We may continue to swear...err...try some more permutations before asking Paul to comment, i have couple other demos which actually worked pretty well switching graphics windows.

[John-Silver]

Thank's for your input Dan.

Yes the 0 values for the function explain why when clicking on any window i closes as you say.
I'd just copied that staright from Rudnei's original code.
This question of what values a clearwin function should be set to has always confused the hell out of me.
A good explanation somewhere in the documentation would be useful. Cue Paul to tell me t's already there and where !?

[LitusSaxonicum]

The reason why all the %gr area control handle variables are zero is that is what you set them, by default. Unlike most controls' handles, which RETURN a handle, the handles for a %gr area have to be GIVEN. When I discovered this, some years ago, I wrote a post entitled 'When is a handle not a handle'.

At least, if you specified:

ihgw_control_panel = 10
ihgw_control_bar = 20
ihgw_simulation =30

before starting the Clearwin+ code, then you can determine which area to draw to with select_graphics_area@. As it is written, all three are graphics handle zero!

It may not be the complete answer, but it is part of it.

To summarise: The handle for %gr must be different for each %gr area, and you specify it, it isn't returned from Clearwin+

Eddie

[DanRRight]

Eddie, You are right.
Damn, after some time of not using i always forget that. Paul has to rename this in HELP from "handle" to "user-defined number" and stress that if it wasn't already done so. Here is complete text. Must be in extended collection of examples for Clearwin if Silverfrost is interested in increase of compiler users base

[rudnei]

Many thanks for your help!

[PaulLaidler]

[John-Silver]

The "Niagara Falls' of all ClearWin Knowledge strikes again !!!
Thank you very much indeed eddie

Indeed I remember that post (now you mention it ans with a little help from Mr. Google (the phpBB forum searcher being quite frankly pretty rubbish§) here is it's link:
http://forums.silverfrost.com/viewtopic.php?t=1372&sid=15d926b7971cc16f22a6b1afe39f1d8a

Plato-nicusSaxonicum even going so far as to sum it all up with the brilliant:

[LitusSaxonicum]

Dan,

It is still a handle. Windows gives you a handle, you give Clearwin+ graphics a handle.

Eddie

[DanRRight]