Steema Central

Posted: **Mon Apr 30, 2012 3:28 pm**

Want to use TImagePointSeries to represent status of networked devices (Ok, problems, down) (see attachment)

: Illustration of what I would like to achieve; LaptopStopLight.png (26.42 KiB) Viewed 2867 times

HELP on the subject implies I can set the background color.
Background color would be that space in the X by Y pixel space not covered by the image.
Having the ability to display a frame around that X by Y pixel space (control the width, color, blah, blah) would also be great.
I can't achieve it.

Can someone point me in the right direction?

thxs,
dmo

Posted: **Wed May 02, 2012 1:36 pm**

Hi dmo,

If I understand you correctly, you would like to have a unique image, with just the computer without any back color, to always load the same image in the hole series and then, you would like to draw a green/yellow/red background to the image. If this is what you meant, it could probably be possible but you would probably have to draw manually the background color at OnBeforeDrawSeries event for example.
However, I think it would be easier to have three images, one for each background color. Here you have an example:

Code: Select all

uses TeePNGImage;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1.View3D:=false;
  Chart1.Legend.Visible:=false;

  with Chart1.AddSeries(TImagePointSeries) as TImagePointSeries do
  begin
    FillSampleValues(9);

    Pointer.HorizSize:=23;
    Pointer.vertSize:=23;
    OnGetImage:=Series1GetImage;
  end;
end;

procedure TForm1.Series1GetImage(Sender: TCustomImagePointSeries;
  ValueIndex: Integer; Picture: TPicture);
begin
  if ValueIndex > -1 then
  case (Round(Sender.XValue[ValueIndex]) mod 3) of
    0: Picture.LoadFromFile('C:\tmp\green.png');
    1: Picture.LoadFromFile('C:\tmp\yellow.png');
    2: Picture.LoadFromFile('C:\tmp\red.png');
  end;
end;

: chart1.png (17.03 KiB) Viewed 2845 times

And the images I used to get the above:

: green.png (1.19 KiB) Viewed 2815 times

: yellow.png (1.19 KiB) Viewed 2817 times

: red.png (1.16 KiB) Viewed 2817 times

Steema Central

TImagePointSeries - can't set the background color or frame

TImagePointSeries - can't set the background color or frame

Re: TImagePointSeries - can't set the background color or frame