[Gambas-user] painting graph to image continuously

[wally]

On Thursday 16 December 2010 18:46:46 wally wrote:
> 
> On Thursday 16 December 2010 18:03:21 Fabien Bodard wrote:
> > if you want us to help you ... please be more explicit on what you want to 
> do !
> > 
> > first why do you want to resize the drawing area ????(for scrolling ?)
> > 
> > are you sure you have understand all the capabilities of a drawing
> > area ?  do you know the _draw event ?
> > 
> > 
> > waht i've understand is :
> > 
> > you want like for an array draw on an image... resizing it with
> > preserve of the last draw, and add a new draw.
> > 
> > if it's that ..; i think there is many things you have not understand
> > ... tell me
> > 
> > 
> 
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> 
> Fabian,
> 
> i just want to do something like an ECG. Drawing a graph from continuously
> received data from SerialPort. Exactly i read data from the ADC of an 
Arduino 
> uC via the Serialport and want to draw this graph. Behind the Arduino ADC
> is a HPLC Detector and to take a spectrogram may last up to an hour.
> I store the data during receive to file for further external math 
processing.
> But i need a visual control whats going on. 
> Using an Image to paint and resize as needed works nice.
> But the DrawingArea do something like copy stuff to new (via resized) area
> instead of just increase width. Maybe i need to repaint always or to buffer 
> the recently drawn stuff before resizing.
> 
> My last attachments contains a picture file with 4 circles. 3 of thes 
circles 
> are created by simply resizing the drawingArea. see attached simple 
> short code please. 
> 
> I do not know whats going on internally and i do not know where to find
> more information and further reading on it.
>  
> > if it's that ..; i think there is many things you have not understand
> > ... tell me
> 
> agree, thats the reason i post here
> 
> > are you sure you have understand all the capabilities of a drawing
> > area ?  do you know the _draw event ?
>    
> where did you find your knowledge on this. If i need to read all the qt4 and 
> GTK stuff i might programm directly in C/C++. I have choosen Gambas for 
rapid 
> apps devel. 
> 
> i try to attach a xcapture,of the DrawingArea behavior, It should explain 
> whats my problem. If it's not allowed to attach a 1MB file i may send to 
> your email.
> 
> (2nd trial: message body too big, i send again without attachment)
> 
> cheers wally
>  
> 
> 
> 
> 
> 
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> Register now for Lotusphere 2011 and learn how
> to connect the dots, take your collaborative environment
> to the next level, and enter the era of Social Business.
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> 

Fabian,

i wrote:
> My last attachments contains a picture file with 4 circles. 3 of thes 
> circles are created by simply resizing the drawingArea. see attached 
> simple short code please. 

this occirs in GB3 DrawingArea only - GB2 behaves as expected.

try this code in GB2 and GB3 :

PUBLIC SUB Button1_Click()
 ' DrawingArea 100, 80 - - > 200, 160, .cache=true

  Draw.Begin(DrawingArea1)
    Draw.Circle(50, 40, 30)
  Draw.End

  DrawingArea1.Resize(200, 160)

END
  
wally