OpenEuphoria

Re: Now is the winter of our integer x,y, etc...

• Posted by Graeme <graemeburke at CROSSWINDS.NET> Jan 27, 2001
• 503 views

At 06:24 PM 27/01/01 -0800, you wrote:
>Soooooooooooooo,
>
>All those numbers are assinged "automatically". Like if you wanted a window
with a bitmap background, you'd use the x1,x2,y1,y2, 
>in the procedure (the bits in the brackets) THEN you'd use it for any
window and the X,Y etc. would be assinged values according to which window
you told it to use? That's a mouthfull! Here's what I mean:  
>
>START
>
>procedure paintwin( integer x1,integer y,integer x2,integer y2)
>-----tell windows to paint the window (I don't know the command off-hand)--
>end procedure
>
>paintwin[window1] 
>
>END
>
>--Then the values of window1 would be plugged into all those confusing
variables yes?
>
>


Windows/win32lib will automatically repaint all of
the controls on the window for you, whenever your 
program is not busy inside a loop, etc.

If you have bitmaps, lines, text etc. drawn on the 
window, YOU must redraw these objects, when required.

Windows lets you know when this needs to be done by
triggering the onPaint event. You are expexted to 
provide and "onPaint_MyWindow()" or something routine
to redraw anything you want to appear on the window.

The whole window need not nessesarily be redrawn every 
time. Perhaps only the corner of your window was behind
another one, and you've brought it to the front again.
Only the corner that was covered by the other window
needs to be redrawn. This is called the 'damaged' area
(or region).

win32lib passes the co-ordinates of the 'damaged' portion
of the window to you routine.

(x1,y1) is the top left corner of damaged section
(x2,y2) is the bottom right corner of damaged section

the simplest of onPaint handlers might ignore what the damaged 
section is, and simply redraw an entire bitmap on a window when 
the on paint event is triggered. 

A more complex one might handle sections of text, lines and
polygons, multiple bitmaps, and calculate which sections of
each of these objects needs to be redrawn to repair the damaged
section in the quickest time possible.

Hope this helps


Graeme



 


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