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TAdvStringGridDealing with floating point number precision in TAdvStringGrid
When wanting to keep floating point numbers with high precision in the grid but display with less precision, the OnGetFloatFormat event can be used. In this code snippet, the grid cell value is set with a floating point number with 8 digits but is displayed with only 3 digits precision. Internally, we can keep calculating with values with 8 digits.
Sample:
// Set float value with full precision begin advstringgrid1.FloatFormat := ''%g''; advstringgrid1.Floats[1,1] := 1.23456789; advstringgrid1.Floats[1,2] := 9.87654321; end; // ensure floating point number is only displayed with 3 digits procedure TForm4.AdvStringGrid1GetFloatFormat(Sender: TObject; ACol, ARow: Integer; var IsFloat: Boolean; var FloatFormat: string); begin FloatFormat := ''%.3f''; end; // do calculation at full precision begin advstringgrid1.Floats[1,3] := advstringgrid1.Floats[1,1] + advstringgrid1.Floats[1,2]; end;
1.235
9.877
but the displayed result is
11.111
as the sum calculated is based on full precision.