Steema Central

Posted: **Fri Apr 24, 2009 12:42 pm**

I have to save a scaled chart in a bitmap, that means I computed the size of the bitmap, the length of axes and the start position of axis in pixel.
I try to change the chart with Chart1.Width, Chart1.Height, Chart1.LeftAxis.IStartPos, Chart1.BottomAxis.IStartPos, Chart1.LeftAxis.IAxisSize and Chart1.BottomAxis.IAxisSize. If I look on my bitmap, the bitmap size is correct, but the axes length is not correct.
What can I do?

Best regards

Roland

Posted: **Fri Apr 24, 2009 1:29 pm**

Sorry, I forgot:

I work with Delphi 7 and TeeChart 8.04 VCL.

I try to change the Chart with this code:

Chart1.Height:=iLeft+iBreit+iRight;
Chart1.Width:=iTop+iLang+iBottom;
Chart1.MarginUnits:=muPixels;
Chart1.MarginLeft:=iTop;
Chart1.MarginBottom:=iLeft;
Chart1.MarginRight:=iBottom;
Chart1.MarginTop:=iRight;
Chart1.LeftAxis.IAxisSize:=iBreit;
Chart1.BottomAxis.IAxisSize:=iLang;

Posted: **Fri Apr 24, 2009 2:57 pm**

Hi Roland,

If we understand well what you are trying to do, why don't you do like this?

Code: Select all

Chart1.CustomChartRect := true;
Chart1.ChartRect := Rect(50,50,Chart1.Width-100,Chart1.Height-100);

Then save your chart to a bitmap:

Code: Select all

Chart1.SaveToBitmapFile(filename,Chart1.ChartRect);

If that's not what you want, please, try to explain what are you exactly trying to achieve.

Posted: **Mon Apr 27, 2009 1:58 pm**

In my software I compute the size of horizontal and vertical axis in pixel. Now I want to create a bitmap of the chart
with the exact length of axes in pixel.

Example:

Code: Select all

  iLeft:=90;
   iTop:=100;
   iWidth:=830;                   {length of horizontal axis in pixel}
   iRight:=110;
   iBottom:=120;
   iHeight:=1340;
   iWidth:=830;                    {length of vertical axis in pixel}                    
   iRight:=60;
   iBottom:=60;
   iHeight:=1340;                     
   Chart1.Width:=iLeft+iWidth+iRight;
   Chart1.Height:=iTop+iHeight+iBottom;
   Chart1.LeftAxis.IAxisSize:=iHeight;
   Chart1.BottomAxis.IAxisSize:=iWidth;
   Chart1.SaveToBitmapFile(SavePictureDialog1.Filename);

The resulting bitmap has the correct size (1030 x 1560 Pixel).
The horizontal axis begins at pixel 63 and stops at pixel 1000 (length 937 pixel - not 830).
The vertical axis begins at pixel 83 and end at pixel 1497 (lenght 1414 pixel - not 1340).

Thanks!

Roland

Posted: **Mon Apr 27, 2009 3:05 pm**

Hi Roland,

I'm not sure to understand what are you exactly trying to do. You are setting iWidth, iRight, iBottom and iHeight and you are resetting them before using. And with this code, I get an image with different size and different chart size than what you say.

Here is how I would do to obtain the image you seem to wish:

Code: Select all

procedure TForm1.FormCreate(Sender: TObject);
var imageWidth, imageHeight, ChartWidth, ChartHeight: Integer;
begin
  imageWidth := 1030;
  imageHeight := 1560;

  ChartWidth := 830;
  ChartHeight := 1340;

  Chart1.Width:=imageWidth;
  Chart1.Height:=imageHeight;

  Chart1.CustomChartRect := true;
  Chart1.ChartRect := Rect((imageWidth-ChartWidth) div 2,(imageHeight-ChartHeight) div 2,
                           ChartWidth+((imageWidth-ChartWidth) div 2),ChartHeight+((imageHeight-ChartHeight) div 2));

  Chart1.SaveToBitmapFile('C:\tmp\myChart.jpg');
end;

Posted: **Mon Apr 27, 2009 5:13 pm**

Hi Yeray,

that's exactly what I try to code...
I have a well log and have to create a Bitmap with a vertical depth axis from top down into the borehole (for a given scale like 1cm = 40 m) and a horizontal axis with the result of a physical measurement (for a given scale too).
Now, you have solved my problem.

Thank you.

Roland

Steema Central

save scaled chart as bitmap

save scaled chart as bitmap