{
fpvutils.pas

Vector graphics document

License: The same modified LGPL as the Free Pascal RTL
         See the file COPYING.modifiedLGPL for more details

AUTHORS: Felipe Monteiro de Carvalho
         Pedro Sol Pegorini L de Lima
}
unit fpvutils;

{$ifdef fpc}
  {$mode delphi}
{$endif}

interface

uses
  Classes, SysUtils, Math,
  fpvectorial, fpimage;

type
  T10Strings = array[0..9] of shortstring;

// Color Conversion routines
function FPColorToRGBHexString(AColor: TFPColor): string;
function RGBToFPColor(AR, AG, AB: byte): TFPColor; inline;
function SeparateString(AString: string; ASeparator: char): T10Strings;

implementation

function FPColorToRGBHexString(AColor: TFPColor): string;
begin
  Result := Format('%.2x%.2x%.2x', [AColor.Red shr 8, AColor.Green shr 8, AColor.Blue shr 8]);
end;

function RGBToFPColor(AR, AG, AB: byte): TFPColor; inline;
begin
  if AR > $100 then Result.Red := (AR shl 8) + $FF
  else Result.Red := AR shl 8;

  if AR > $100 then Result.Green := (AG shl 8) + $FF
  else Result.Green := AG shl 8;

  if AR > $100 then Result.Blue := (AB shl 8) + $FF
  else Result.Blue := AB shl 8;

  Result.Alpha := $FFFF;
end;

{@@
  Reads a string and separates it in substring
  using ASeparator to delimite them.

  Limits:

  Number of substrings: 10 (indexed 0 to 9)
  Length of each substring: 255 (they are shortstrings)
}
function SeparateString(AString: string; ASeparator: char): T10Strings;
var
  i, CurrentPart: integer;
begin
  CurrentPart := 0;

  { Clears the result }
  for i := 0 to 9 do
    Result[i] := '';

  { Iterates througth the string, filling strings }
  for i := 1 to Length(AString) do
  begin
    if Copy(AString, i, 1) = ASeparator then
    begin
      Inc(CurrentPart);

      { Verifies if the string capacity wasn't exceeded }
      if CurrentPart > 9 then
        Exit;
    end
    else
      Result[CurrentPart] := Result[CurrentPart] + Copy(AString, i, 1);
  end;
end;

end.