(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2010 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; version 2 of the License

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 *)

procedure doStepFlake(Gear: PVisualGear; Steps: Longword);

var sign: float;

begin

if vobCount = 0 then exit;

sign:= 1;

with Gear^ do

    begin

    inc(FrameTicks, Steps);

    if FrameTicks > vobFrameTicks then

        begin

        dec(FrameTicks, vobFrameTicks);

        inc(Frame);

        if Frame = vobFramesCount then Frame:= 0

        end;

    X:= X + (cWindSpeedf * 200 + dX + tdX) * Steps;

    Y:= Y + (dY + tdY + cGravityf * vobFallSpeed) * Steps;

    Angle:= Angle + dAngle * Steps;

    if (round(X) >= -cScreenWidth - 64) and

       (round(X) <= cScreenWidth + LAND_WIDTH) and

       (round(Y) <= (LAND_HEIGHT + 75)) and 

       (Timer > 0) and (Timer-Steps > 0) then

        begin

        if tdX > 0 then sign := 1

        else sign:= -1;

        tdX:= tdX - 0.005*Steps*sign;

        if ((sign < 0) and (tdX > 0)) or ((sign > 0) and (tdX < 0)) then tdX:= 0;

        if tdX > 0 then sign := 1

        else sign:= -1;

        tdY:= tdY - 0.005*Steps*sign;

        if ((sign < 0) and (tdY > 0)) or ((sign > 0) and (tdY < 0)) then tdY:= 0;

        dec(Timer, Steps)

        end

    else

        begin

        if round(X) < -cScreenWidth - 64 then X:= float(cScreenWidth + LAND_WIDTH) else

        if round(X) > cScreenWidth + LAND_WIDTH then X:= float(-cScreenWidth - 64);

        // if round(Y) < (LAND_HEIGHT - 1024 - 75) then Y:= Y + float(25); // For if flag is set for flakes rising upwards?

        if round(Y) > (LAND_HEIGHT + 75) then Y:= Y - float(1024 + 150); // TODO - configure in theme (jellies for example could use limited range)

        Timer:= 0;

        tdX:= 0;

        tdY:= 0

        end;

    end;

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepBeeTrace(Gear: PVisualGear; Steps: Longword);

begin

if Gear^.FrameTicks > Steps then

    dec(Gear^.FrameTicks, Steps)

else

    DeleteVisualGear(Gear);

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepCloud(Gear: PVisualGear; Steps: Longword);

var s: Longword;

    t: float;

begin

Gear^.X:= Gear^.X + (cWindSpeedf * 200 + Gear^.dX) * Steps;

// up-and-down-bounce magic

s := (GameTicks + Gear^.Timer) mod 4096;

t := 8 * AngleSin(s mod 2048).QWordValue / 4294967296;

if (s < 2048) then t := -t;

Gear^.Y := LAND_HEIGHT-1184 + Gear^.Timer mod 8 + t;

if round(Gear^.X) < -cScreenWidth - 256 then Gear^.X:= float(cScreenWidth + LAND_WIDTH) else

if round(Gear^.X) > cScreenWidth + LAND_WIDTH then Gear^.X:= float(-cScreenWidth - 256)

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepExpl(Gear: PVisualGear; Steps: Longword);

begin

Gear^.X:= Gear^.X + Gear^.dX * Steps;

Gear^.Y:= Gear^.Y + Gear^.dY * Steps;

//Gear^.dY:= Gear^.dY + cGravityf;

if Gear^.FrameTicks <= Steps then

    if Gear^.Frame = 0 then DeleteVisualGear(Gear)

    else

        begin

        dec(Gear^.Frame);

        Gear^.FrameTicks:= cExplFrameTicks

        end

    else dec(Gear^.FrameTicks, Steps)

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepEgg(Gear: PVisualGear; Steps: Longword);

begin

Gear^.X:= Gear^.X + Gear^.dX * Steps;

Gear^.Y:= Gear^.Y + Gear^.dY * Steps;

Gear^.dY:= Gear^.dY + cGravityf * Steps;

Gear^.Angle:= round(Gear^.Angle + Steps) mod cMaxAngle;

if Gear^.FrameTicks <= Steps then

    DeleteVisualGear(Gear)

else

    dec(Gear^.FrameTicks, Steps)

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepFire(Gear: PVisualGear; Steps: Longword);

begin

Gear^.X:= Gear^.X + Gear^.dX * Steps;

Gear^.Y:= Gear^.Y + Gear^.dY * Steps;// + cGravityf * (Steps * Steps);

Gear^.dY:= Gear^.dY + cGravityf * Steps;

if Gear^.FrameTicks <= Steps then

       DeleteVisualGear(Gear)

else

    dec(Gear^.FrameTicks, Steps)

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepShell(Gear: PVisualGear; Steps: Longword);

begin

Gear^.X:= Gear^.X + Gear^.dX * Steps;

Gear^.Y:= Gear^.Y + Gear^.dY * Steps;

Gear^.dY:= Gear^.dY + cGravityf * Steps;

Gear^.Angle:= round(Gear^.Angle + Steps) mod cMaxAngle;

if Gear^.FrameTicks <= Steps then

    DeleteVisualGear(Gear)

else

    dec(Gear^.FrameTicks, Steps)

end;

procedure doStepSmallDamage(Gear: PVisualGear; Steps: Longword);

begin

Gear^.Y:= Gear^.Y - 0.02 * Steps;

if Gear^.FrameTicks <= Steps then

    DeleteVisualGear(Gear)

else

    dec(Gear^.FrameTicks, Steps)

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepBubble(Gear: PVisualGear; Steps: Longword);

begin

    Gear^.X:= Gear^.X + (cWindSpeedf * 100 + Gear^.dX) * Steps;

    Gear^.Y:= Gear^.Y - cDrownSpeedf * Steps;

    if (Gear^.FrameTicks <= Steps) or (round(Gear^.Y) < cWaterLine) then

        DeleteVisualGear(Gear)

    else

        dec(Gear^.FrameTicks, Steps)

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepHealth(Gear: PVisualGear; Steps: Longword);

begin

Gear^.X:= Gear^.X + Gear^.dX * Steps;

Gear^.Y:= Gear^.Y - Gear^.dY * Steps;

if Gear^.FrameTicks <= Steps then

    DeleteVisualGear(Gear)

else

    dec(Gear^.FrameTicks, Steps);

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepSteam(Gear: PVisualGear; Steps: Longword);

begin

    Gear^.X:= Gear^.X + (cWindSpeedf * 100 + Gear^.dX) * Steps;

    Gear^.Y:= Gear^.Y - cDrownSpeedf * Steps;

    if Gear^.FrameTicks <= Steps then

        if Gear^.Frame = 0 then DeleteVisualGear(Gear)

        else

            begin

            if Random(2) = 0 then dec(Gear^.Frame);

            Gear^.FrameTicks:= cExplFrameTicks

            end

        else dec(Gear^.FrameTicks, Steps)

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepAmmo(Gear: PVisualGear; Steps: Longword);

begin

    Gear^.Y:= Gear^.Y - cDrownSpeedf * Steps;

    Gear^.scale:= Gear^.scale + 0.0025 * Steps;

    Gear^.alpha:= Gear^.alpha - 0.0015 * Steps;

    if Gear^.alpha < 0 then DeleteVisualGear(Gear)

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepSmoke(Gear: PVisualGear; Steps: Longword);

begin

    Gear^.X:= Gear^.X + (cWindSpeedf + Gear^.dX) * Steps;

    Gear^.Y:= Gear^.Y - (cDrownSpeedf + Gear^.dY) * Steps;

    Gear^.dX := Gear^.dX + (cWindSpeedf * 0.3 * Steps);

    //Gear^.dY := Gear^.dY - (cDrownSpeedf * 0.995);

    if Gear^.FrameTicks <= Steps then

        if Gear^.Frame = 0 then DeleteVisualGear(Gear)

        else

            begin

            if Random(2) = 0 then dec(Gear^.Frame);

            Gear^.FrameTicks:= cExplFrameTicks

            end

        else dec(Gear^.FrameTicks, Steps)

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepDust(Gear: PVisualGear; Steps: Longword);

begin

    Gear^.X:= Gear^.X + (cWindSpeedf + (cWindSpeedf * 0.03 * Steps) + Gear^.dX) * Steps;

    Gear^.Y:= Gear^.Y - (Gear^.dY) * Steps;

    Gear^.dX := Gear^.dX - (Gear^.dX * 0.005 * Steps);

    Gear^.dY := Gear^.dY - (cDrownSpeedf * 0.001 * Steps);

    if Gear^.FrameTicks <= Steps then

        if Gear^.Frame = 0 then DeleteVisualGear(Gear)

        else

            begin

            dec(Gear^.Frame);

            Gear^.FrameTicks:= cExplFrameTicks

            end

        else dec(Gear^.FrameTicks, Steps)

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepSplash(Gear: PVisualGear; Steps: Longword);

begin

  if Gear^.FrameTicks <= Steps then

      DeleteVisualGear(Gear)

  else

      dec(Gear^.FrameTicks, Steps);

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepDroplet(Gear: PVisualGear; Steps: Longword);

begin

  Gear^.X:= Gear^.X + Gear^.dX * Steps;

  Gear^.Y:= Gear^.Y + Gear^.dY * Steps;

  Gear^.dY:= Gear^.dY + cGravityf * Steps;

  if round(Gear^.Y) > cWaterLine then begin

    DeleteVisualGear(Gear);

    PlaySound(TSound(ord(sndDroplet1) + Random(3)));

    end;

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepSmokeRing(Gear: PVisualGear; Steps: Longword);

begin

inc(Gear^.Timer, Steps);

if Gear^.Timer >= Gear^.FrameTicks then DeleteVisualGear(Gear)

else

    begin

    Gear^.scale := 1.25 * (-power(2, -10 * Int(Gear^.Timer)/Gear^.FrameTicks) + 1) + 0.4;

    Gear^.alpha := 1 - power(Gear^.Timer / 350, 4);

    if Gear^.alpha < 0 then Gear^.alpha:= 0;

    end;

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepFeather(Gear: PVisualGear; Steps: Longword);

begin

Gear^.X:= Gear^.X + Gear^.dX * Steps;

Gear^.Y:= Gear^.Y + Gear^.dY * Steps;

Gear^.dY:= Gear^.dY + cGravityf * Steps;

Gear^.Angle:= round(Gear^.Angle + Steps) mod cMaxAngle;

if Gear^.FrameTicks <= Steps then

    DeleteVisualGear(Gear)

else

    dec(Gear^.FrameTicks, Steps)

end;

////////////////////////////////////////////////////////////////////////////////

const cSorterWorkTime = 640;

var thexchar: array[0..cMaxTeams] of

            record

            dy, ny, dw: LongInt;

            team: PTeam;

            SortFactor: QWord;

            end;

    currsorter: PVisualGear = nil;

procedure doStepTeamHealthSorterWork(Gear: PVisualGear; Steps: Longword);

var i, t: LongInt;

begin

for t:= 1 to Steps do

    begin

    dec(Gear^.Timer);

    if (Gear^.Timer and 15) = 0 then

        for i:= 0 to Pred(TeamsCount) do

            with thexchar[i] do

                begin

                {$WARNINGS OFF}

                team^.DrawHealthY:= ny + dy * LongInt(Gear^.Timer) div 640;

                team^.TeamHealthBarWidth:= team^.NewTeamHealthBarWidth + dw * LongInt(Gear^.Timer) div cSorterWorkTime;

                {$WARNINGS ON}

                end;

    if (Gear^.Timer = 0) or (currsorter <> Gear) then

        begin

        if currsorter = Gear then currsorter:= nil;

        DeleteVisualGear(Gear);

        exit

        end

    end

end;

procedure doStepTeamHealthSorter(Gear: PVisualGear; Steps: Longword);

var i: Longword;

    b: boolean;

    t: LongInt;

begin

Steps:= Steps; // avoid compiler hint

for t:= 0 to Pred(TeamsCount) do

    with thexchar[t] do

        begin

        dy:= TeamsArray[t]^.DrawHealthY;

        dw:= TeamsArray[t]^.TeamHealthBarWidth - TeamsArray[t]^.NewTeamHealthBarWidth;

        team:= TeamsArray[t];

        SortFactor:= TeamsArray[t]^.Clan^.ClanHealth;

        SortFactor:= (SortFactor shl  3) + TeamsArray[t]^.Clan^.ClanIndex;

        SortFactor:= (SortFactor shl 30) + TeamsArray[t]^.TeamHealth;

        end;

if TeamsCount > 1 then

    repeat

    b:= true;

    for t:= 0 to TeamsCount - 2 do

        if (thexchar[t].SortFactor > thexchar[Succ(t)].SortFactor) then

            begin

            thexchar[cMaxTeams]:= thexchar[t];

            thexchar[t]:= thexchar[Succ(t)];

            thexchar[Succ(t)]:= thexchar[cMaxTeams];

            b:= false

            end

    until b;

t:= - 4;

for i:= 0 to Pred(TeamsCount) do

    with thexchar[i] do

        begin

        dec(t, team^.HealthTex^.h + 2);

        ny:= t;

        dy:= dy - ny

        end;

Gear^.Timer:= cSorterWorkTime;

Gear^.doStep:= @doStepTeamHealthSorterWork;

currsorter:= Gear;

//doStepTeamHealthSorterWork(Gear, Steps)

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepSpeechBubbleWork(Gear: PVisualGear; Steps: Longword);

begin

if Gear^.Timer > Steps then dec(Gear^.Timer, Steps) else Gear^.Timer:= 0;

if (PHedgehog(Gear^.Hedgehog)^.Gear <> nil) then

    begin

    Gear^.X:= PHedgehog(Gear^.Hedgehog)^.Gear^.X.QWordValue/4294967296 + (Gear^.Tex^.w div 2  - Gear^.FrameTicks);

    Gear^.Y:= PHedgehog(Gear^.Hedgehog)^.Gear^.Y.QWordValue/4294967296 - (16 + Gear^.Tex^.h);

    end;

if Gear^.Timer = 0 then

    begin

    if PHedgehog(Gear^.Hedgehog)^.SpeechGear = Gear then

        PHedgehog(Gear^.Hedgehog)^.SpeechGear:= nil;

    DeleteVisualGear(Gear)

    end;

end;

procedure doStepSpeechBubble(Gear: PVisualGear; Steps: Longword);

begin

Steps:= Steps; // avoid compiler hint

with PHedgehog(Gear^.Hedgehog)^ do

    if SpeechGear <> nil then SpeechGear^.Timer:= 0;

PHedgehog(Gear^.Hedgehog)^.SpeechGear:= Gear;

Gear^.Timer:= max(Length(Gear^.Text) * 150, 3000);

Gear^.Tex:= RenderSpeechBubbleTex(Gear^.Text, Gear^.FrameTicks, fnt16);

case Gear^.FrameTicks of

    1: Gear^.FrameTicks:= SpritesData[sprSpeechTail].Width-28;

    2: Gear^.FrameTicks:= SpritesData[sprThoughtTail].Width-20;

    3: Gear^.FrameTicks:= SpritesData[sprShoutTail].Width-10;

    end;

Gear^.doStep:= @doStepSpeechBubbleWork;

Gear^.Y:= Gear^.Y - float(Gear^.Tex^.h)

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepHealthTagWork(Gear: PVisualGear; Steps: Longword);

begin

if Steps > Gear^.Timer then

    DeleteVisualGear(Gear)

else

    begin

    dec(Gear^.Timer, Steps);

    Gear^.Y:= Gear^.Y + Gear^.dY * Steps;

    end;

end;

procedure doStepHealthTagWorkUnderWater(Gear: PVisualGear; Steps: Longword);

begin

if round(Gear^.Y) < cWaterLine + 10 then

    DeleteVisualGear(Gear)

else

    Gear^.Y:= Gear^.Y - 0.08 * Steps;

end;

procedure doStepHealthTag(Gear: PVisualGear; Steps: Longword);

var s: shortstring;

begin

s:= '';

Gear^.dY:= -0.08;

str(Gear^.State, s);

if Gear^.Hedgehog <> nil then

    Gear^.Tex:= RenderStringTex(s, PHedgehog(Gear^.Hedgehog)^.Team^.Clan^.Color, fnt16)

else

    Gear^.Tex:= RenderStringTex(s, cWhiteColor, fnt16);

if round(Gear^.Y) < cWaterLine then

    Gear^.doStep:= @doStepHealthTagWork

else

    Gear^.doStep:= @doStepHealthTagWorkUnderWater;

Gear^.Y:= Gear^.Y - float(Gear^.Tex^.h);

if Steps > 1 then Gear^.doStep(Gear, Steps-1);

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepSmokeTrace(Gear: PVisualGear; Steps: Longword);

begin

inc(Gear^.Timer, Steps );

if Gear^.Timer > 64 then

    begin

    dec(Gear^.State, Gear^.Timer div 65);

    Gear^.Timer:= Gear^.Timer mod 65;

    end;

Gear^.dX:= Gear^.dX + cWindSpeedf * Steps;

Gear^.X:= Gear^.X + Gear^.dX;

if Gear^.State = 0 then DeleteVisualGear(Gear);

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepExplosionWork(Gear: PVisualGear; Steps: Longword);

begin

inc(Gear^.Timer, Steps);

if Gear^.Timer > 75 then

    begin

    inc(Gear^.State, Gear^.Timer div 76);

    Gear^.Timer:= Gear^.Timer mod 76;

    if Gear^.State > 5 then DeleteVisualGear(Gear);

    end;

end;

procedure doStepExplosion(Gear: PVisualGear; Steps: Longword);

var i: LongWord;

gX,gY: LongInt;

begin

gX:= round(Gear^.X);

gY:= round(Gear^.Y);

for i:= 0 to 31 do AddVisualGear(gX, gY, vgtFire);

for i:= 0 to  8 do AddVisualGear(gX, gY, vgtExplPart);

for i:= 0 to  8 do AddVisualGear(gX, gY, vgtExplPart2);

Gear^.doStep:= @doStepExplosionWork;

if Steps > 1 then Gear^.doStep(Gear, Steps-1);

end;

////////////////////////////////////////////////////////////////////////////////

procedure doStepBigExplosionWork(Gear: PVisualGear; Steps: Longword);

//var maxMovement: LongInt;