installing v8 over v4

[Narcís]

Hi Roy,

1] Does this seem reasonable?

Yes, it is likely that C++ Builder 4 is not able to resolve folders with blank spaces on it.

2] If so, should it also work with v8?

I have tried it here but it seems Chart1->Title is still throwing an Access Violation. We will investigate the issue further.

[Roy]

Narcis:
Thanks for your help. Will use v6 for now since it works and has the changes for logarithmic axis that we were looking for. What about v7?
Does it work with BCB4? Does it have save to JPG image routines?
Roy

[Narcís]

Hi Roy,

What about v7? Does it work with BCB4?

I'm afraid not. Has same problem as v8.

Does it have save to JPG image routines?

Yes, as v6 does as you can see in the All Features\Welcome!\Exporting\Chart Picture\JPEG example in the new features demo available at TeeChart's program group.

[Roy]

Narcis:
Again thanks for the response. What function in v6 is used to save the graph to JPG format? The only function I find is the SaveToBitmapFile() function.
Roy

[Narcís]

Hi Roy,

Have you looked at the demo I told you? It is available with the features demo shipped with the binary installers. You'll also find a full JPEG example at Tutorial 12 - Exporting and Importing Charts. Tutorials are also available at TeeChart's progrma group created by the binary installers. Here's tutorial info:

JPEG
JPEG file export has additional parameters for speed and quality. See the JPEG demo included in the Examples folder. The Export method has not been included natively for TeeChart to avoid the memory overhead for non-JPEG applications.

Example

Code: Select all

// You need to include the Delphi JPEG unit in the Uses section of your project
// Pass the name of the Chart to this function. We've fixed the parameters here.
// In the demo they are presented as options for the user.
// Place a Chart (Chart1) on a Form and populate it with data.

procedure TForm1.BitBtn1Click(Sender: TObject);
begin
 With GetChartJPEG(Chart1) do
 try
  SaveToFile('c:\temp\myJPEGChart.jpg');    { <-- save the JPEG to disk }
 finally
  Free;  { <-- free the temporary JPEG object }
 end;
end;

Function GetChartJPEG(AChart:TCustomChart):TJPEGImage;
var tmpBitmap:TBitmap;
begin
  result:=TJPEGImage.Create;   { <-- create a TJPEGImage }
  tmpBitmap:=TBitmap.Create;   { <-- create a temporary TBitmap }
  try
    tmpBitmap.Width :=AChart.Width;   { <-- set the bitmap dimensions }
    tmpBitmap.Height:=AChart.Height;
    { draw the Chart on the temporary Bitmap... }
    AChart.Draw(tmpBitmap.Canvas,Rect(0,0,tmpBitmap.Width,tmpBitmap.Height));
    { set the desired JPEG options... }
    With result do
    begin
      GrayScale            :=False;
      ProgressiveEncoding  :=True;
      CompressionQuality   :=50;  // % 0 - 100
      PixelFormat          :=jf24bit;  // or jf8bit
      ProgressiveDisplay   :=True;
      Performance          :=jpBestQuality;  // or jpBestSpeed
      Scale                :=jsFullSize;  // or jsHalf, jsQuarter, jsEighth
      Smoothing            :=True;
      { Copy the temporary Bitmap onto the JPEG image... }
      Assign(tmpBitmap);
    end;
  finally
    tmpBitmap.Free;  { <-- free the temporary Bitmap }
  end;
end;

Performance, jpegBestQuality, and the Compression Quality percentage (high value less compression), will make the file larger and thus slower to transmit across a network - quality is better though! You will need to decide on the best balance to suit your application.

[Roy]

Narcis:
I found the function TeeSaveToJPEGFile() which needs the header file TeeJPEG.hpp which I included. The program compiled but would not link because it could resolve the TeeSaveToJPEGFile() call. Do you know what library file or unit I need to use in my program. Unfortunately the code you show is in Pascal and I am using BCB4 which is C++.
Roy

[Narcís]

Hi Roy,

It's in TeeJPEG unit. Have you added a pragma link to this unit in your unit?

[Roy]

Narcis:
I have founf the TeeJPEG.hpp file but not the TeeJPEG unit. Also how would use the Pragma for this?
Roy

[Narcís]

Hi Roy,

No, adding TeeJPEG.hpp to the unit's .h should be enough. Which is the exact error message you get?

BTW: You may also need to include JPEG unit as described here.

[Roy]

Narcis:
Thanks for the reply. I cannot fint the TeeJPEG unit and have included the TeeJPEG.hpp header file. I get the following error:
[Linker Error]Unresolved external '__teejpeg::TeeSaveToJPEGFile(....)'

This would indicate I need either the TeeJPEG.cpp file (unit) or the library file with the code.
Roy

[Narcís]

Hi Roy,

It works fine for me here using v6.01 installer for BCB 4 and copying its "CBuilder4" folder to a path with no blank spaces on it (eg.: C:\temp\CBuilder4). then I set "Bin" and "Lib" folders there at the search path lists.