Subversion Repositories jumper

unit LevelFunctions;

interface

uses

  SysUtils, Dialogs, Functions, ExtCtrls, Classes, Math;

type

  TFieldType = (ftUndefined, ftFullSpace, ftEmpty, ftRed, ftYellow, ftGreen);

  TFieldProperties = record

    Typ: TFieldType;

    Goal: Boolean;

  end;

  TGameMode = (gmUndefined, gmNormal, gmDiagonal);

  TRow = record

    Indent: integer;

    Fields: array of TFieldProperties;

  end;

  TLevelArray = array of TRow;

  TLevelError = (leUndefined, leNone, leInvalidElement, leEmptyBoard, leRowInvalidLength,

                 leUnsupportedVersion, leUnsupportedMode);

  TLevel = class(TObject)

  private

    FStringList: TStringList;

    procedure Load(ABoardFile: string);

    function GetGameMode: TGameMode;

  public

    constructor Create(ABoardFile: string);

    destructor Destroy; override;

    function LevelStringToLevelArray(ShowErrors: boolean): TLevelArray;

    function CheckLevelIntegrity: TLevelError; overload;

    function CheckLevelIntegrity(ShowErrors: boolean): TLevelError; overload;

    property GameMode: TGameMode read GetGameMode;

  end;

  TField = record

    FieldType: TFieldType;

    Goal: Boolean;

    Panel: TPanel;

    Stone: TImage;

  end;

  TGoalStatus = (gsUndefined, gsNoGoal, gsMultipleStonesRemaining, gsLastStoneInGoalRed, gsLastStoneInGoalYellow, gsLastStoneInGoalGreen, gsLastStoneOutsideGoal);

  TFieldState = (fsUndefined, fsError, fsLocked, fsAvailable, fsStone);

  TPlayGroundMatrix = record

    Fields: array of array of TField;

  public

    function MatrixHasGoal: boolean;

    function GoalFieldType: TFieldType;

    function MatrixWorth: integer;

    procedure ClearMatrix(FreeVCL: boolean);

    function CloneMatrix: TPlayGroundMatrix;

    function FieldState(t: TFieldType): TFieldState; overload;

    function FieldState(f: TField): TFieldState; overload;

    function FieldState(x, y: integer): TFieldState; overload;

    function CanJump(SourceX, SourceY, DestX, DestY: integer; DiagonalOK: boolean): boolean; overload;

    function CanJump(SourceX, SourceY: integer; DiagonalOK: boolean): boolean; overload;

    function CanJump(DiagonalOK: boolean): boolean; overload;

  end;

function FieldTypeWorth(t: TFieldType): integer;

implementation

function FieldTypeWorth(t: TFieldType): integer;

begin

  if t = ftGreen then result := 10

  else if t = ftYellow then result := 20

  else if t = ftRed then result := 30

  else result := 0;

end;

{ TPlayGroundMatrix }

function TPlayGroundMatrix.MatrixHasGoal: boolean;

var

  x, y: integer;

begin

  result := false;

  for x := Low(Fields) to High(Fields) do

  begin

    for y := Low(Fields[x]) to High(Fields[x]) do

    begin

      result := result or Fields[x][y].Goal;

    end;

  end;

end;

function TPlayGroundMatrix.GoalFieldType: TFieldType;

var

  x, y: integer;

begin

  result := ftEmpty; // Damit der Compiler nicht meckert

  for x := Low(Fields) to High(Fields) do

  begin

    for y := Low(Fields[x]) to High(Fields[x]) do

    begin

      if Fields[x][y].Goal then result := Fields[x][y].FieldType

    end;

  end;

end;

function TPlayGroundMatrix.MatrixWorth: integer;

var

  x, y: integer;

begin

  result := 0;

  for x := Low(Fields) to High(Fields) do

  begin

    for y := Low(Fields[x]) to High(Fields[x]) do

    begin

      Inc(result, FieldTypeWorth(Fields[x][y].FieldType));

    end;

  end;

end;

procedure TPlayGroundMatrix.ClearMatrix(FreeVCL: boolean);

var

  x, y: integer;

begin

  for x := Low(Fields) to High(Fields) do

  begin

    for y := Low(Fields[x]) to High(Fields[x]) do

    begin

      if FreeVCL then

      begin

        if Assigned(Fields[x][y].Stone) then Fields[x][y].Stone.Free;

        if Assigned(Fields[x][y].Panel) then Fields[x][y].Panel.Free;

      end;

    end;

    SetLength(Fields[x], 0);

  end;

  SetLength(Fields, 0);

end;

function TPlayGroundMatrix.CloneMatrix: TPlayGroundMatrix;

var

  x, y: integer;

begin

  SetLength(result.Fields, Length(Fields));

  for x := Low(Fields) to High(Fields) do

  begin

    SetLength(result.Fields[x], Length(Fields[x]));

    for y := Low(Fields[x]) to High(Fields[x]) do

    begin

      result.Fields[x][y].FieldType := Fields[x][y].FieldType;

      result.Fields[x][y].Goal      := Fields[x][y].Goal;

      result.Fields[x][y].Panel     := Fields[x][y].Panel;

      result.Fields[x][y].Stone     := Fields[x][y].Stone;

    end;

  end;

end;

function TPlayGroundMatrix.FieldState(t: TFieldType): TFieldState;

begin

  result := fsError;

  case t of

    ftFullSpace: result := fsLocked;

    ftEmpty:     result := fsAvailable;

    ftGreen:     result := fsStone;

    ftYellow:    result := fsStone;

    ftRed:       result := fsStone;

  end;

end;

function TPlayGroundMatrix.FieldState(f: TField): TFieldState;

begin

  result := FieldState(f.FieldType);

end;

function TPlayGroundMatrix.FieldState(x, y: integer): TFieldState;

begin

  result := fsError;

  if (x < Low(Fields)) or (x > High(Fields)) then exit;

  if (y < Low(Fields[x])) or (y > High(Fields[x])) then exit;

  result := FieldState(Fields[x][y]);

end;

function TPlayGroundMatrix.CanJump(SourceX, SourceY, DestX, DestY: integer; DiagonalOK: boolean): boolean;

begin

  result := false;

  // Check 1: Ist das Zielfeld überhaupt leer?

  if FieldState(DestX, DestY) <> fsAvailable then exit;

  // Check 2: Befindet sich ein Stein zwischen Source und Destination und ist der Abstand 2?

  if DiagonalOK then

  begin

    if (SourceX-2 = DestX) and (SourceY-2 = DestY) and (FieldState(SourceX-1, SourceY-1) = fsStone) then result := true;

    if (SourceX-2 = DestX) and (SourceY+2 = DestY) and (FieldState(SourceX-1, SourceY+1) = fsStone) then result := true;

    if (SourceX+2 = DestX) and (SourceY-2 = DestY) and (FieldState(SourceX+1, SourceY-1) = fsStone) then result := true;

    if (SourceX+2 = DestX) and (SourceY+2 = DestY) and (FieldState(SourceX+1, SourceY+1) = fsStone) then result := true;

  end;

  if (SourceX+2 = DestX) and (SourceY   = DestY) and (FieldState(SourceX+1, SourceY  ) = fsStone) then result := true;

  if (SourceX-2 = DestX) and (SourceY   = DestY) and (FieldState(SourceX-1, SourceY  ) = fsStone) then result := true;

  if (SourceX   = DestX) and (SourceY+2 = DestY) and (FieldState(SourceX  , SourceY+1) = fsStone) then result := true;

  if (SourceX   = DestX) and (SourceY-2 = DestY) and (FieldState(SourceX  , SourceY-1) = fsStone) then result := true;

end;

function TPlayGroundMatrix.CanJump(SourceX, SourceY: integer; DiagonalOK: boolean): boolean;

begin

  if FieldState(SourceX, SourceY) <> fsStone then

  begin

    result := false;

    exit;

  end;

  result := true;

  if CanJump(SourceX, SourceY, SourceX+2, SourceY, DiagonalOK) then exit;

  if CanJump(SourceX, SourceY, SourceX-2, SourceY, DiagonalOK) then exit;

  if CanJump(SourceX, SourceY, SourceX, SourceY+2, DiagonalOK) then exit;

  if CanJump(SourceX, SourceY, SourceX, SourceY-2, DiagonalOK) then exit;

  if DiagonalOK then

  begin

    if CanJump(SourceX, SourceY, SourceX-2, SourceY-2, DiagonalOK) then exit;

    if CanJump(SourceX, SourceY, SourceX+2, SourceY-2, DiagonalOK) then exit;

    if CanJump(SourceX, SourceY, SourceX-2, SourceY+2, DiagonalOK) then exit;

    if CanJump(SourceX, SourceY, SourceX+2, SourceY+2, DiagonalOK) then exit;

  end;

  result := false;

end;

function TPlayGroundMatrix.CanJump(DiagonalOK: boolean): boolean;

var

  x, y: integer;

begin

  result := false;

  for x := Low(Fields) to High(Fields) do

  begin

    for y := Low(Fields[x]) to High(Fields[x]) do

    begin

      if CanJump(x, y, DiagonalOK) then

      begin

        result := true;

        break;

      end;

      if result then break;

    end;

  end;

end;

{ TLevel }

const NUM_HEADERS = 2;

constructor TLevel.Create(ABoardFile: string);

begin

  inherited Create;

  FStringList := TStringList.Create;

  Load(ABoardFile);

end;

destructor TLevel.Destroy;

begin

  FreeAndNil(FStringList);

  inherited;

end;

function TLevel.GetGameMode: TGameMode;

begin

  if LowerCase(FStringList.Strings[1]) = 'mode: normal' then

    result := gmNormal

  else if LowerCase(FStringList.Strings[1]) = 'mode: diagonal' then

    result := gmDiagonal

  else

    result := gmUndefined;

end;

procedure TLevel.Load(ABoardFile: string);

var

  i: Integer;

begin

  FStringList.Clear;

  FStringList.LoadFromFile(ABoardFile);

  // Remove whitespaces and empty lines

  for i := FStringList.Count-1 downto NUM_HEADERS do

  begin

    FStringList.Strings[i] := StringReplace(FStringList.Strings[i], ' ', '', [rfReplaceAll]);

    if FStringList.Strings[i] = '' then FStringList.Delete(i);

  end;

end;

function TLevel.LevelStringToLevelArray(ShowErrors: boolean): TLevelArray;

var

  i: integer;

  t: TFieldType;

  err: TLevelError;

  y: Integer;

  x: Integer;

  Line: string;

  lch, uch: char;

  ch: char;

begin

  // Zuerst nach Fehlern suchen

  err := CheckLevelIntegrity(ShowErrors);

  if err <> leNone then exit;

  // Nun Matrix aufbauen

  SetLength(result, 0);

  for i := NUM_HEADERS to FStringList.Count-1 do

  begin

    y := i - NUM_HEADERS;

    SetLength(result, Length(result)+1); // add line to matrix

    Line := FStringList.Strings[i];

    result[y].Indent := DotsAtBeginning(Line) - DotsAtEnd(Line);

    Line := StringReplace(Line, '.', '', [rfReplaceAll]);

    SetLength(result[y].Fields, Length(Line));

    for x := 0 to Length(Line)-1 do

    begin

      ch := Line[x+1];

      lch := LowerCase(ch)[1];

      uch := UpperCase(ch)[1];

      t := ftUndefined;

      case lch of

        '*': t := ftFullSpace;

        'e': t := ftEmpty;

        'r': t := ftRed;

        'y': t := ftYellow;

        'g': t := ftGreen;

      end;

      result[y].Fields[x].Typ := t;

      result[y].Fields[x].Goal := (ch = uch) and (ch <> lch);

    end;

  end;

end;

function TLevel.CheckLevelIntegrity(ShowErrors: boolean): TLevelError;

resourcestring

  LNG_LVL_INVALID_ELEMENT = 'Level invalid: There are invalid elements in the file.'+#13#10#13#10+'Valid elements are r/R, y/Y, g/G, e/E, . and *.';

  LNG_LVL_UNSUPPORTED_VERSION = 'Level format invalid: Version not supported.';

  LNG_LVL_UNSUPPORTED_MODE = 'Level format invalid: Mode not supported.';

  LNG_LVL_EMPTY_BOARD = 'Level invalid: Board is empty.';

  LNG_LVL_INVALID_LENGTH = 'Level invalid: Lines don''t have an equal amount of elements.';

begin

  result := CheckLevelIntegrity;

  if ShowErrors then

  begin

    case result of

      leNone: ;

      leInvalidElement: MessageDlg(LNG_LVL_INVALID_ELEMENT, mtError, [mbOk], 0);

      leUnsupportedVersion: MessageDlg(LNG_LVL_UNSUPPORTED_VERSION, mtError, [mbOk], 0);

      leUnsupportedMode: MessageDlg(LNG_LVL_UNSUPPORTED_MODE, mtError, [mbOk], 0);

      leEmptyBoard: MessageDlg(LNG_LVL_EMPTY_BOARD, mtError, [mbOk], 0);

      leRowInvalidLength: MessageDlg(LNG_LVL_INVALID_LENGTH, mtError, [mbOk], 0);

    end;

  end;

end;

function TLevel.CheckLevelIntegrity: TLevelError;

var

  tmp: string;

  i: Integer;

  Line: string;

  firstLine: string;

  thisLine: string;

begin

  result := leNone;

  // Check 1: Ist der Header OK?

  if LowerCase(FStringList.Strings[0]) <> 'version 2' then

  begin

    result := leUnsupportedVersion;

    exit;

  end;

  if ((LowerCase(FStringList.Strings[1]) <> 'mode: normal') and (LowerCase(FStringList.Strings[1]) <> 'mode: diagonal')) then

  begin

    result := leUnsupportedMode;

    exit;

  end;

  // Check 2: Ist das Brett leer?

  tmp := '';

  for i := NUM_HEADERS to FStringList.Count-1 do tmp := tmp + FStringList.Strings[i];

  if Trim(StringReplace(tmp, '.', '', [rfReplaceAll])) = '' then

  begin

    result := leEmptyBoard;

    exit;

  end;

  // Check 3: Geht das Level nicht in einem Quadrat oder Rechteck auf?

  firstLine := StringReplace(FStringList.Strings[NUM_HEADERS], '.', '', [rfReplaceAll]);

  for i := NUM_HEADERS to FStringList.Count-1 do

  begin

    thisLine := StringReplace(FStringList.Strings[i], '.', '', [rfReplaceAll]);

    if Length(thisLine) <> Length(firstLine) then

    begin

      result := leRowInvalidLength; // at row y-NUM_HEADERS

      exit;

    end;

  end;

  // Check 4: Gibt es ungültige Elemente in den Zeilen?

  for i := NUM_HEADERS to FStringList.Count-1 do

  begin

    Line := FStringList.Strings[i];

    Line := StringReplace(Line, '.', '', [rfReplaceAll]);

    Line := StringReplace(Line, '*', '', [rfReplaceAll]);

    Line := StringReplace(Line, 'r', '', [rfReplaceAll, rfIgnoreCase]);

    Line := StringReplace(Line, 'y', '', [rfReplaceAll, rfIgnoreCase]);

    Line := StringReplace(Line, 'g', '', [rfReplaceAll, rfIgnoreCase]);

    Line := StringReplace(Line, 'e', '', [rfReplaceAll, rfIgnoreCase]);

    if Length(Line) > 0 then

    begin

      result := leInvalidElement; // at row y-NUM_HEADERS

      Exit;

    end;

  end;

  // Check 5: Kann im Level gesprungen werden?

  { Wird hier nicht abgeprüft, da dafür zuerst der PlayGround gebaut sein muss.

    Es ist außerdem eher ein logischer Fehler, kein Fehler in der Levelstruktur! }

end;

end.