FASTREPORT Adding objects dynamically in report script - delphi

Question

I try to add TLineView objects to a report.
The number of lines is depending on a certain number, retrieved by the reports dataset.
I have put my code into the scripts initialization part and in a very experimental test version it looks like this:
var nol, i: integer;
child, newChild: TfrxChild;
noteLine1, noteLine2: TfrxLineView;
page: TfrxPage;
begin
page := ReportName;
nol := <DS_MAIN."VOLUME"> /2;
nol := nol + <DS_MAIN."VOLUME"> mod 2;
child3.child := TfrxChild.create(nil);
newchild := child3.child;
newChild.Visible := true;
noteLine1 := TfrxLineView.create(newChild);
noteLine1.name := 'nl1000';
noteLine1.Top := 0.73;
noteLine1.Width := 7.5;
noteLine1.Left := 3;
noteLine1.Visible := true;
noteLine1.Parent.Objects.Remove(noteLine1);
noteLine1.Parent.Objects.Add(noteLine1);
// newChild.Objects.Add(noteLine1);
noteLine2 := TfrxLineView.create(newChild);
noteLine2.name := 'nl1001';
noteLine2.Top := 0.73;
noteLine2.Width := 7.5;
noteLine2.Left := 11.2;
newChild.Objects.Add(noteLine2);
noteLine2.Visible := true;
for i := 1 to nol do begin
Child := TfrxChild.create(nil);
NewChild.child := Child;
newChild := child;
end;
end.
Instead of getting two lines side by side, with a gap between them, I get only a single short line of a length of around 3-4 mm.
The above code is just a snap of my trial-and-error session.
Hope now that there could be anyone to give me some clues.

Answer 1

If I understand your question correctly, you need to consider at least the following:
With your for loop you create bands, not lines. You may try to change the logic and create objects (memos, lines, shapes) with bands as owners.
The objects’ coordinates and sizes are set in pixels, so you need an additional calculation.
From documentation:
Objects’ coordinates and sizes are set in pixels. Since the «Left,»
«Top,» «Width,» and «Height» properties of all objects have the
«Extended» type, you can point out non-integer values. The following
constants are defined for converting pixels into centimeters and
inches:
fr01cm = 3.77953;
fr1cm = 37.7953;
fr01in = 9.6;
fr1in = 96;
The following working example generates five TfrxLineView objects. Just put an empty report on your form and add report title band:
procedure TfrmMain.btnPreviewClick(Sender: TObject);
var
nol, i: integer;
left: Extended;
band: TfrxReportTitle;
line: TfrxLineView;
begin
// Band
band := (report.Report.FindObject('ReportBand') as TfrxReportTitle);
// Lines generation
left := 3;
nol := 5;
for i := 1 to nol do begin
line := TfrxLineView.Create(band);
line.CreateUniqueName;
line.Top := 0.73;
line.Width := fr1cm * 2;
line.Left := left;
left := left + line.Width + 30;
end;
// Report preview
report.ShowReport(False);
end;

Answer 2

This is my final solution:
procedure Child8OnBeforePrint(Sender: TfrxComponent);
var nol, i: integer;
left1, left2: extended;
child, newChild: TfrxChild;
noteLine1, noteLine2, line: TfrxLineView;
page: TfrxPage;
band: TfrxChild;
begin
nol := <DS_MAIN."VOLUME"> /2;
nol := nol + <DS_MAIN."VOLUME"> mod 2;
band := TfrxChild(TRP_ORDER_NOTE.FindObject('Child9'));
// Lines generation
left1 := 3*fr1cm;
left2 := 11.2*fr1cm;
for i := 1 to nol do begin
line := TfrxLineView.Create(band);
line.Name := 'noteLine'+intToStr(1+2*(i-1+trunc(random*1000000))); //Panic solution
line.Top := fr1cm*(0.73 + (i-1)*0.75);
line.Width := 7.5*fr1cm;
line.Left := left1;
if (<DS_MAIN."VOLUME"> mod 2 > 0 ) and (i = nol) then
exit
else
begin
line := TfrxLineView.Create(band);
line.Name := 'noteLine'+intToStr(2*i+trunc(random*1000000));
line.Top := fr1cm*(0.73 + (i-1)*0.75);
line.Width := 7.5*fr1cm;
line.Left := left2;
end;
end;
end;