OnBeforeDrawSeries

[Vivo]

How do I know which series is about to be drawn?

I though that it would be passed. I actually thought that I had seen it some where that it was, but I cannot seem to find that reference.

Thanks


Adrian

[Narcís]

Hi Adrian,

This event is called before the chart paints all series, as you can see in TeeChart's help:

BeforeDrawSeries event is called just before the Series points are painted.

WARNING:

Do not change Series properties that would force the Series to be repainted.

This may cause recursion and endless repainting !


What are you exactly trying to achieve with that? We can try to give you an alternative to achieve what you need.

[Vivo]

I am trying to have a background for each axis that I can turn on and off at will.

Thanks,


Adrian

[Narcís]

Hi Adrian,

I am trying to have a background for each axis that I can turn on and off at will.

Will this depend on the series visible on the Chart? Could you please be more explicit about what are you trying to achive?

BTW: Have you thought about using TeeChart's OnAfterDraw event? A TChart1.Environment.InternalRepaint call may be sometimes necessary to trigger the event.

[Vivo]

Will this depend on the series visible on the Chart? Could you please be more explicit about what are you trying to achive?

I have multiple axes that I move around independently of each other. I wish to put a background on each. I have been trying to use the ColorBand, which would work sufficently for part of the application, but I would also want to display a box underneath series higer in the z order but above other series lower in the z order.

Example:

Code: Select all

I'm showing this in a code block as it uses a monospaced font.


            <--- Back of screen               Front of screen ---> 
                  Lower z-order               Higher z-order 

         Panel  axis-a   series-a   box-b axis-b   series-b   axis-c   series-c
       ^       ^       ^          ^              ^          ^        ^          ^
       |       |       |          |              |          |        |          |
      OBDC    OBDS    OBDS       OBDA           OBDS       OBDA     OBDS       OADC

NOTE: The arrows are to indicate where in the z-order the callback functions are called. The callback functions are as follows:

• OBDC - OnBeforeDrawChart
  OBDA - OnBeforeDrawAxis
  OBDS - OnBeforeDrawSeries
  OADC - OnAfterDrawChart

I want box-b to be drawn after series-a but before axis-b. However, what I am getting from you is that the z-order is as follows:

Code: Select all

I'm showing this in a code block as it uses a monospaced font

              <--- Back of screen               Front of screen --->
                    Lower z-order               Higher z-order
  
            Panel   axis-a axis-b axis-c   series-a series-b series-c  
          ^       ^                      ^                            ^
          |       |                      |                            |
         OBDC    OBDA                   OBDS                         OADC

Which may be a problem.

BTW: Have you thought about using TeeChart's OnAfterDraw event? A TChart1.Environment.InternalRepaint call may be sometimes necessary to trigger the event.

I have thought of it but it will cause unwanted overlapping. Unless I cannot find any other way, I will have to rethink how this will be displayed. Do you have any other suggestions?

Thanks,


Adrian

[Vivo]

Will someone please state if what I am saying in the previous post is right or wrong?

Thanks,


Adrian

[Pep]

Hi Adrian,

I have multiple axes that I move around independently of each other. I wish to put a background on each. I have been trying to use the ColorBand, which would work sufficently for part of the application, but I would also want to display a box underneath series higer in the z order but above other series lower in the z order.

In that case, a trick could be to use a Shape series (with rectangle style), you can add it just before the series you want to keep on top (or change order when you want).