unit Game;
interface
uses
SysUtils, Classes, Forms, GameBinStruct;
type
TPictureType = (ptDia, ptDecision);
THotspotIndex = 0..2;
TGame = class;
PHotspot = ^THotspot;
THotspot = record
game: TGame;
lpAction: PActionDef;
cHotspotTopLeft: TCoord;
cHotspotBottomRight: TCoord;
end;
TShowPictureCallback = procedure(Game: TGame; AFilename: string; AType: TPictureType) of object;
TPlaySoundCallback = procedure(Game: TGame; AFilename: string) of object;
TSimpleCallback = procedure(Game: TGame) of object;
TWaitCallback = function(Game: TGame; AMilliseconds: integer): boolean of object;
TSetHotspotCallback = procedure(Game: TGame; AIndex: THotspotIndex; AHotspot: THotspot) of object;
TClearHotspotsCallback = procedure(Game: TGame) of object;
TGame = class(TObject)
private
FPictureShowCallback: TShowPictureCallback;
FAsyncSoundCallback: TPlaySoundCallback;
FExitCallback: TSimpleCallback;
FWaitCallback: TWaitCallback;
FSetHotspotCallback: TSetHotspotCallback;
FClearHotspotsCallback: TClearHotspotsCallback;
FDirectory: string;
FScore: integer;
FCurDecisionScene: PSceneDef;
FPrevDecisionScene: PSceneDef;
procedure TryExit;
procedure PrevDecisionScene;
protected
GameData: TGameBinFile;
function Wait(AMilliseconds: integer): boolean;
procedure PlayScene(scene: PSceneDef; goToDecision: boolean);
public
procedure PerformAction(action: PActionDef);
property PictureShowCallback: TShowPictureCallback read FPictureShowCallback write FPictureShowCallback;
property AsyncSoundCallback: TPlaySoundCallback read FAsyncSoundCallback write FAsyncSoundCallback;
property ExitCallback: TSimpleCallback read FExitCallback write FExitCallback;
property WaitCallback: TWaitCallback read FWaitCallback write FWaitCallback;
property SetHotspotCallback: TSetHotspotCallback read FSetHotspotCallback write FSetHotspotCallback;
property ClearHotspotsCallback: TClearHotspotsCallback read FClearHotspotsCallback write FClearHotspotsCallback;
property Directory: string read FDirectory;
property Score: integer read FScore;
constructor Create(ADirectory: string);
procedure Run;
end;
implementation
{ TGame }
constructor TGame.Create(ADirectory: string);
var
fs: TFileStream;
gameBinFilename: string;
begin
FDirectory := ADirectory;
gameBinFilename := IncludeTrailingPathDelimiter(ADirectory) + 'GAME.BIN';
if not FileExists(gameBinFilename) then
begin
raise Exception.Create('Cannot find GAME.BIN');
end;
fs := TFileStream.Create(gameBinFilename, fmOpenRead);
try
fs.ReadBuffer(GameData, SizeOf(GameData));
finally
FreeAndNil(fs);
end;
end;
procedure TGame.TryExit;
begin
if Assigned(ExitCallback) then ExitCallback(Self);
end;
procedure TGame.PrevDecisionScene;
begin
if Assigned(FPrevDecisionScene) then PlayScene(FPrevDecisionScene, true)
end;
procedure TGame.PerformAction(action: PActionDef);
var
nextScene: PSceneDef;
begin
Inc(FScore, action^.scoreDelta);
if action^.nextSceneID = SCENEID_PREVDECISION then
PrevDecisionScene
else if action^.nextSceneID = SCENEID_ENDGAME then
TryExit
else
begin
nextScene := GameData.FindScene(action^.nextSceneID);
if Assigned(nextScene) then
PlayScene(nextScene, action^.sceneSegment=SEGMENT_DECISION)
(*
else
raise Exception.CreateFmt('Scene %d was not found in GAME.BIN', [action^.nextSceneID]);
*)
end;
end;
function TGame.Wait(AMilliseconds: integer): boolean;
begin
if Assigned(WaitCallback) then
begin
result := WaitCallback(Self, AMilliseconds)
end
else
begin
Sleep(AMilliseconds);
result := false; // don't cancel
end;
end;
procedure TGame.PlayScene(scene: PSceneDef; goToDecision: boolean);
var
i: integer;
hotspot: THotspot;
begin
if Assigned(ClearHotspotsCallback) then
begin
ClearHotspotsCallback(Self);
end;
if not goToDecision then
begin
if Assigned(AsyncSoundCallback) then
begin
AsyncSoundCallback(Self, IncludeTrailingPathDelimiter(FDirectory) +
scene^.szSceneFolder + PathDelim + scene^.szDialogWav);
end;
for i := scene^.pictureIndex to scene^.pictureIndex + scene^.numPics - 1 do
begin
if Assigned(PictureShowCallback) then
begin
PictureShowCallback(Self, IncludeTrailingPathDelimiter(FDirectory) +
scene^.szSceneFolder + PathDelim + GameData.pictures[i].szBitmapFile, ptDia);
end;
if Wait(GameData.pictures[i].duration * 100) then
begin
// Wait was cancelled by VK_RETURN
AsyncSoundCallback(Self, '');
break;
end;
if Application.Terminated then Abort;
end;
end;
if scene^.szDecisionBmp <> '' then
begin
FPrevDecisionScene := FCurDecisionScene;
FCurDecisionScene := scene;
if Assigned(PictureShowCallback) then
begin
PictureShowCallback(Self, IncludeTrailingPathDelimiter(FDirectory) +
scene^.szSceneFolder + PathDelim + scene^.szDecisionBmp, ptDecision);
end;
if Assigned(SetHotspotCallback) then
begin
for i := 0 to scene^.numActions - 1 do
begin
hotspot.Game := Self;
hotspot.lpAction := @scene^.actions[i];
hotspot.cHotspotTopLeft.X := scene^.actions[i].cHotspotTopLeft.X;
hotspot.cHotspotTopLeft.Y := scene^.actions[i].cHotspotTopLeft.Y;
hotspot.cHotspotBottomRight.X := scene^.actions[i].cHotspotBottomRight.X;
hotspot.cHotspotBottomRight.Y := scene^.actions[i].cHotspotBottomRight.Y;
SetHotspotCallback(Self, i, hotspot);
end;
end;
end
else
begin
if scene^.numActions > 0 then PerformAction(@scene^.actions[0]);
end;
end;
procedure TGame.Run;
begin
if GameData.numScenes = 0 then exit;
PlayScene(@GameData.Scenes[0], false);
end;
end.