MacFormat 1994 November/macformat-018.iso/Utility Spectacular/Developer/SAT/SAT Invaders sample ƒ/main.p

Text File | 1994-07-26 | 9.9 KB | 324 lines | [TEXT/PJMM]

{================================================}
{=============== SATInvaders main unit ================}
{================================================}

{ Example file for Ingemars Sprite Animation Toolkit. }
{ © Ingemar Ragnemalm 1992 }
{ See doc files for legal terms for using this code. }

{ SATInvaders is a very simple game demonstrating how to use the Sprite Animation}
{ Toolkit. It is intended as a minimal demonstration, without many features and options}
{ that the other sample program, HeartQuest, has. No high scores or even score, only}
{ one life, doesn't save settings, only one kind of enemy, no special effects like explosions}
{ etc. However, it is still a full Mac application with menus and event handling (using}
{TransSkel). There are now some even more "minimal" demos without that.}

program SATInvaders;

    uses
        TransSkel, SAT, GameGlobals, SoundConst, sPlayer, sEnemy, sShot, sMissile;

    var
        soundFlag, plotFastFlag: Boolean;

{ -------------------------------------------------------------------- }
{                                Game driver procedures                                }
{ -------------------------------------------------------------------- }

{ Setup a new level. This is called when the game starts and at each new level.}
    procedure SetupLevel (level: integer);
        var
            i, j: integer;
            sp: SpritePtr;
    begin { SetupLevel }

{ Clear the Sprite list! Note that this leaves the images "dead" on the screen,}
{ but we will soon erase them. }
        while gSAT.sRoot <> nil do
            KillSprite(gSAT.sRoot);

        missileCount := 0; { count variable in mMissile }

{ Create all the enemy sprites for the level, depending on the level number. }
        for i := 0 to (level + 1) do
            for j := 0 to (level div 2) + 1 do
                sp := NewSprite(-3, i * 40 + 2, j * 40 - 40 * (level div 2 + 1), @SetupEnemy);

{ Make the player sprite. }
        sp := NewSprite(2, gSAT.offSizeH div 2, gSAT.offSizeV - 40, @SetupPlayer);

{ Copy BackScreen to OffScreen to erase old sprites. }
        CopyBits(gSAT.backScreen^.portbits, gSAT.offScreen^.portbits, gSAT.offScreen^.portrect, gSAT.offScreen^.portrect, srcCopy, nil);
        PeekOffScreen;
    end; { SetupLevel }

{ Start a new game. Initialize level, score, number of lives, and call setuplevel to make the first level. }
    procedure StartGame;
    begin
        Level := 1;
        SetupLevel(level);
    end;

{ Declare forward since we want to call it from MoveIt }
    procedure DoFileMenu (item: integer);
    forward;

{ This routine is the game driver. It calls RunSAT repeatedly until the game ends or is paused. }
{ I also read the keyboard here. This could optionally be moved to the "player object" module. }

    procedure MoveIt;
        var
            t: longint;
            theEvent: EventRecord; { för att testa musklick }
    begin
        stillrunning := true; { A flag that tells whether or not to quit this routine. }

{ Hide cursor and menu bar }
 { NOTE: No matter how we leave the MoveIt procedure, we should ShowCursor. }
        HideCursor;
        HideMBar(gSAT.wind);
        PeekOffscreen; {We must redraw the menu bar area. I'm lazy and redraw it all.}

{ Main loop! Keep running until the game is paused or ends. }
        while stillrunning = true do
            begin
                t := TickCount; {Remember when we started the last turn through the loop.}

{ Here is the real heart of the loop: call Animator once per loop. It will call all the objects,}
{ draw and erase them, sort them etc. }
                RunSAT(plotFastFlag);

{ All the rest of the main loop is game specific, next level, bonus handling, etc. }

{Handle the speed of the invaders. Since all move the same way, this is done globally.}
                if globalspeed.h = 0 then
                    begin
                        downcount := pred(downcount);
                        if downcount <= 0 then
                            begin
                                globalspeed.h := -lasth;
                                globalspeed.v := 0;
                                turnflag := false;
                            end;
                    end
                else if turnflag then
                    begin
                        downcount := 10;
                        lasth := globalspeed.h;
                        globalspeed.h := 0;
                        globalspeed.v := 3;
                    end;

{End of level? If so, set up a new one!}
                if not gSAT.anyMonsters then
                    begin
                        SATSoundShutUp;
                        level := level + 1;
                        SetupLevel(level);
                    end; {if not anymonsters}

{ Check for keys being pressed - but don't allow background processing.}
{ If you want background processing, either use GetNextEvent+SystemTask or WaitNextEvent (the modern call).}
                if GetOSEvent(keyDownMask, theEvent) then { keydown only }
                    if BitAnd(theEvent.modifiers, cmdKey) <> 0 then {Command key pressed?}
                        case char(BitAnd(theEvent.message, charCodeMask)) of {With what key?}
                            'q':
                                begin {Quit!}
                                    SkelWhoa;        {Tell TransSkel to quit.}
{ Do all the things we have to do when we leave MoveIt! }
                                    SATSoundShutUp; { Dispose of sound channel }
                                    FlushEvents(EveryEvent, 0); { To forget events, like mouse clicks etc. }
                                    ShowCursor;
                                    ShowMBar;
                                    exit(MoveIt);
                                end;
                            's':
                                begin {Sound on/off}
                                    DoFileMenu(sound);
                                end;
                            otherwise
                                ; {Ignore others}
                        end; { case}

{ Delay, using TickCount so it doesn't matter how fast our Mac is. }
                while ((TickCount - t) < 3) do {3/60 per frame = 20 fps if possible}
                    ;
            end; { while stillrunning (main loop) }

        while not SATSoundDone do
            SATSoundEvents; {Wait for last sound to complete}

        ShowCursor; {Balance HideCursor}
        ShowMBar;
        FlushEvents(EveryEvent - DiskMask, 0); { To forget events, like mouse clicks etc. except disk events }

        ReportStr('Sorry, game over.');

        SATSoundShutUp; { Dispose of sound channel }
    end; { MoveIt }

    procedure GameWindUpdate;
        var
            watch: CursHandle;
    begin
{Set the cursor to wait cursor during screen depth change test. If there's no change,}
{the user won't notice.}
        watch := GetCursor(WatchCursor);
        SetCursor(watch^^);
        if SATDepthChangeTest then
            begin
{Do anything needed after a screen depth change. In this demo, nothing.}
            end;
        ReleaseResource(Handle(watch));
{Set the cursor to arrow again.}
        InitCursor;

{Process the update event by redrawing the window.}
        PeekOffScreen;

{Note: PeekOffScreen can be replaced by drawing with CopyBits, i.e.:}
{SATSetPortScreen;}
{CopyBits(offScreen^.portBits, SATwind^.portBits, offScreen^.portRect, offScreen^.portRect, srcCopy, nil);}
{plus drawing borders. PeekOffScreen draws them black.}
    end;

{    Process selection from File menu.}

    procedure DoFileMenu (item: integer);
    begin
        case item of
            run:
                begin
{ Test if we have Color QD, and if so, test bit depth! Alert if features^^.PlotFast.}
                    if not ((gSAT.initDepth = 1) or (gSAT.initDepth = 4) or (gSAT.initDepth = 8)) and plotFastFlag then
                        begin
                            ReportStr('Please uncheck ''Fast animation'' or set the monitor to b/w, 4-bit or 8-bit mode in the Control Panel.');
                            exit(DoFileMenu);
                        end;
                    if SATDepthChangeTest then {Update if necessary}
                        ;
                    StartGame;
                    ShowWindow(gSAT.wind);
                    SelectWindow(gSAT.wind);
                    GameWindUpdate;
                    MoveIt;
                end;
            sound:
                begin
                    soundFlag := not soundFlag;
                    CheckItem(FileMenu, sound, soundFlag);
                    if soundFlag then { Tell the sound package our settings, so we don't have to bother. }
                        SATSoundOn
                    else
                        SATSoundOff;
                end;
            fastAnimation:
                begin
                    plotFastFlag := not plotFastFlag;
                    CheckItem(fileMenu, fastAnimation, plotFastFlag);
                end;
            quit:
                SkelWhoa;
        end;
    end;

    procedure GameWindInit;
    begin
{ Tell TransSkel to tell us when to update SATwind. }
        if SkelWindow(gSAT.wind, nil, nil, @GameWindUpdate, nil, nil, nil, nil, false) then
            ;

        ShowWindow(gSAT.wind);
        SelectWindow(gSAT.wind);
{ Draw the contents of the window (to give the user something to look at during the rest of startup). }
        PeekOffScreen;
    end;

{ -------------------------------------------------------------------- }
{                        Menu handling procedures                        }
{ -------------------------------------------------------------------- }

{    Handle selection of "About…" item from Apple menu}

    procedure DoAbout;
    begin
        if Alert(aboutAlrt, nil) = 1 then
            ;
    end;

{    Initialize menus.  Tell TransSkel to process the Apple menu}
{    automatically, and associate the proper procedures with the}
{    File menu.}

    procedure SetUpMenus;
    begin
        SkelApple('About SAT Invaders…', @DoAbout);
        fileMenu := GetMenu(fileMenuRes);
        if SkelMenu(fileMenu, @DoFileMenu, nil, true) then
            ;
{ Set the following flags so they match the menu }
        soundFlag := true;
        plotFastFlag := true;
    end;

{ Hide gamewindow on suspend, so the user can get access to disk icons etc. }

    procedure DoSuspendResume (b: boolean);
    begin
        if b then
            begin
                ShowWindow(gSAT.wind);
                SelectWindow(gSAT.wind);
            end
        else
            HideWindow(gSAT.wind)
    end;

    function DoEvt (e: eventRecord): boolean;
    begin
        if e.what = OSevt then
            begin
                if BAND(BROTL(e.message, 8), $FF) = SuspendResumeMessage then
                    DoSuspendResume(BAnd(e.message, 1) <> 0);
                DoEvt := true;
            end
        else
            DoEvt := false;
    end; (* end DoEvent *)

{ -------------------------------------------------------------------- }
{                                    Main                                }
{ -------------------------------------------------------------------- }

    var
        gameArea: Rect;

begin
    SkelInit(6, nil);                { initialize }

{ Init all the different parts of the game. }

    SetUpMenus;                        { install menu handlers }

    SetRect(gameArea, 0, 0, 512, 342);
{We use CustomInitSAT to cover the full screen INCLUDING menu bar area!}
    CustominitSAT(129, 128, gameArea, nil, nil, true, true, true, true, true);
{InitSAT(129, 128, 512, 322);    {PICTs 129 and 128, width 512, height 322.}
    GameWindInit;    { Install the game window (SATwind) in TransSkel and show it. }
    Loadsounds;        { Preload all sound resources }

{ Call the init routines for all the sprite units (generally to preload faces)!}
{ This must be done after InitSAT! }
    InitEnemy;
    InitPlayer;
    InitMissile;
    InitShot;

    randSeed := TickCount;    { Set the randseed to something that is random enough. }

    SkelEventHook(@DoEvt); { Handle MultiFinder-events }

    SkelMain;                    { Loop 'til Quit selected }
    SkelClobber;                { Clean up }
    SATSoundShutUp;            { Terminate sounds, free the sound channel. }
end.