(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2012 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

 *)

(*

 * This file contains the step handlers for visual gears.

 *

 * Since the effects of visual gears do not affect the course of the game,

 * no "synchronization" between players is required.

 * => The usage of safe functions or data types (e.g. GetRandom() or hwFloat)

 * is usually not necessary and therefore undesirable.

 *)

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

var sign: real;

begin

if vobCount = 0 then exit;

sign:= 1;

with Gear^ do

    begin

    inc(FrameTicks, Steps);

    if not SuddenDeathDmg and (FrameTicks > vobFrameTicks) then

        begin

        dec(FrameTicks, vobFrameTicks);

        inc(Frame);

        if Frame = vobFramesCount then

            Frame:= 0

        end

    else if SuddenDeathDmg and (FrameTicks > vobSDFrameTicks) then

        begin

        dec(FrameTicks, vobSDFrameTicks);

        inc(Frame);

        if Frame = vobSDFramesCount then

            Frame:= 0

        end;

    X:= X + (cWindSpeedf * 400 + dX + tdX) * Steps * Gear^.Scale;

    if SuddenDeathDmg then

        Y:= Y + (dY + tdY + cGravityf * vobSDFallSpeed) * Steps * Gear^.Scale

    else

        Y:= Y + (dY + tdY + cGravityf * vobFallSpeed) * Steps * Gear^.Scale;

    Angle:= Angle + dAngle * Steps;

    if Angle > 360 then

        Angle:= Angle - 360

    else

        if Angle < - 360 then

            Angle:= Angle + 360;

    if (round(X) >= cLeftScreenBorder)

    and (round(X) <= cRightScreenBorder)

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

    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) < cLeftScreenBorder then

            X:= X + cScreenSpace

        else

            if round(X) > cRightScreenBorder then

                X:= X - cScreenSpace;

            // if round(Y) < (LAND_HEIGHT - 1024 - 75) then Y:= Y + 25.0; // For if flag is set for flakes rising upwards?

            if (Gear^.Layer = 2) and (round(Y) - 225 > LAND_HEIGHT) then

                Y:= Y - (1024 + 300) // TODO - configure in theme (jellies for example could use limited range)

            else if (Gear^.Layer <> 2) and (round(Y) + 50 > LAND_HEIGHT) then

                Y:= Y - (1024 + 25);

        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: real;

begin

Gear^.X:= Gear^.X + (cWindSpeedf * 750 * Gear^.dX * Gear^.Scale) * Steps;

// up-and-down-bounce magic

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

t := 8 * Gear^.Scale * hwFloat2Float(AngleSin(s mod 2048));

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

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

if round(Gear^.X) < cLeftScreenBorder then

    Gear^.X:= Gear^.X + cScreenSpace

else

    if round(Gear^.X) > cRightScreenBorder then

        Gear^.X:= Gear^.X - cScreenSpace

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 doStepNote(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 / 2;

Gear^.Angle:= Gear^.Angle + (Gear^.Frame + 1) * Steps / 10;

while Gear^.Angle > cMaxAngle do

    Gear^.Angle:= Gear^.Angle - cMaxAngle;

if Gear^.FrameTicks <= Steps then

    DeleteVisualGear(Gear)

else

    dec(Gear^.FrameTicks, Steps)

end;

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

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

begin

Steps := Steps;

if Gear^.Timer <= Steps then

    DeleteVisualGear(Gear)

else

    dec(Gear^.Timer, 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

    begin

    DeleteVisualGear(Gear);

    exit

    end

else

    dec(Gear^.FrameTicks, Steps);

if Gear^.FrameTicks < $FF then

   Gear^.Tint:= (Gear^.Tint and $FFFFFF00) or Gear^.FrameTicks

end;

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

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

var vgt: PVisualGear;

begin

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

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

if (Gear^.State and gstTmpFlag) = 0 then

    begin

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

    if ((GameTicks mod 200) < Steps + 1) then

        begin

        vgt:= AddVisualGear(round(Gear^.X), round(Gear^.Y), vgtFire);

        if vgt <> nil then

            begin

            vgt^.dx:= 0;

            vgt^.dy:= 0;

            vgt^.State:= gstTmpFlag;

            end;

        end

    end

else

    inc(Steps, 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 + Gear^.dX * Steps;

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

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

Gear^.dX := Gear^.dX / (1.001 * Steps);

Gear^.dY := Gear^.dY / (1.001 * Steps);

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

    begin

    Gear^.X:= hwFloat2Float(Gear^.Hedgehog^.Gear^.X) + (Gear^.Tex^.w div 2  - Gear^.FrameTicks);

    Gear^.Y:= hwFloat2Float(Gear^.Hedgehog^.Gear^.Y) - (16 + Gear^.Tex^.h);

    end;

if Gear^.Timer = 0 then

    begin

    if Gear^.Hedgehog^.SpeechGear = Gear then

        Gear^.Hedgehog^.SpeechGear:= nil;

    DeleteVisualGear(Gear)

    end;

end;

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

begin

Steps:= Steps; // avoid compiler hint

with Gear^.Hedgehog^ do

    if SpeechGear <> nil then