(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2012 Richard Deurwaarder <xeli@xelification.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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 *)

{$INCLUDE "options.inc"}

unit uTouch;

interface

uses SysUtils, uUtils, uConsole, uVariables, SDLh, uFloat, uConsts, uCommands, GLUnit, uTypes, uCaptions, uAmmos, uWorld;

procedure initModule;

procedure freeModule;

procedure ProcessTouch;

procedure NewTurnBeginning;

procedure onTouchDown(x, y: Single; pointerId: TSDL_FingerId);

procedure onTouchMotion(x, y, dx, dy: Single; pointerId: TSDL_FingerId);

procedure onTouchUp(x, y: Single; pointerId: TSDL_FingerId);

function convertToCursorX(x: LongInt): LongInt;

function convertToCursorY(y: LongInt): LongInt;

function addFinger(x,y: Longword; id: TSDL_FingerId): PTouch_Data;

function updateFinger(x,y,dx,dy: Longword; id: TSDL_FingerId): PTouch_Data;

procedure deleteFinger(id: TSDL_FingerId);

procedure onTouchClick(finger: TTouch_Data);

procedure onTouchDoubleClick(finger: TTouch_Data);

procedure onTouchLongClick(finger: TTouch_Data);

function findFinger(id: TSDL_FingerId): PTouch_Data;

procedure aim(finger: TTouch_Data);

function isOnCrosshair(finger: TTouch_Data): boolean;

function isOnCurrentHog(finger: TTouch_Data): boolean;

procedure convertToWorldCoord(var x,y: LongInt; finger: TTouch_Data);

procedure convertToFingerCoord(var x,y: LongInt; oldX, oldY: LongInt);

function fingerHasMoved(finger: TTouch_Data): boolean;

function calculateDelta(finger1, finger2: TTouch_Data): LongInt;

function getSecondFinger(finger: TTouch_Data): PTouch_Data;

function isOnRect(rect: TSDL_Rect; finger: TTouch_Data): boolean;

function isOnRect(x,y,w,h: LongInt; finger: TTouch_Data): boolean;

function isOnWidget(widget: TOnScreenWidget; finger: TTouch_Data): boolean;

procedure printFinger(finger: TTouch_Data);

implementation

const

    clickTime = 200;

    nilFingerId = High(TSDL_FingerId);

    baseRectSize = 96;

var

    rectSize, halfRectSize: LongInt;

    pointerCount : Longword;

    fingers: array of TTouch_Data;

    moveCursor : boolean;

    invertCursor : boolean;

    xTouchClick,yTouchClick : LongInt;

    timeSinceClick : Longword;

    //Pinch to zoom

    pinchSize : LongInt;

    baseZoomValue: GLFloat;

    //aiming

    aimingCrosshair: boolean;

    aimingUp, aimingDown: boolean;

    targetAngle: LongInt;

    buttonsDown: Longword;

    targetting, targetted: boolean; //true when targetting an airstrike or the like

procedure onTouchDown(x, y: Single; pointerId: TSDL_FingerId);

var

    finger: PTouch_Data;

    xr, yr: LongWord;

begin

xr:= round(x * cScreenWidth);

yr:= round(y * cScreenHeight);

finger:= addFinger(xr, yr, pointerId);

inc(buttonsDown);//inc buttonsDown, if we don't see a button down we'll dec it

if isOnCrosshair(finger^) then

begin

    aimingCrosshair:= true;

    aim(finger^);

    moveCursor:= false;

    exit;

end;

if isOnWidget(fireButton, finger^) then

    begin

    ParseTeamCommand('+attack');

    moveCursor:= false;

    finger^.pressedWidget:= @fireButton;

    exit;

    end;

if isOnWidget(arrowLeft, finger^) then

    begin

    ParseTeamCommand('+left');

    moveCursor:= false;

    finger^.pressedWidget:= @arrowLeft;

    exit;

    end;

if isOnWidget(arrowRight, finger^) then

    begin

    ParseTeamCommand('+right');

    moveCursor:= false;

    finger^.pressedWidget:= @arrowRight;

    exit;

    end;

if isOnWidget(arrowUp, finger^) then

    begin

    ParseTeamCommand('+up');

    aimingUp:= true;

    moveCursor:= false;

    finger^.pressedWidget:= @arrowUp;

    exit;

    end;

if isOnWidget(arrowDown, finger^) then

    begin

    ParseTeamCommand('+down');

    aimingDown:= true;

    moveCursor:= false;

    finger^.pressedWidget:= @arrowDown;

    exit;

    end;

if isOnWidget(pauseButton, finger^) then

    begin

    isPaused:= not isPaused;

    moveCursor:= false;

    finger^.pressedWidget:= @pauseButton;

    exit;

    end;

if isOnWidget(utilityWidget, finger^) then

    begin

    finger^.pressedWidget:= @utilityWidget;

    moveCursor:= false;

    if(CurrentHedgehog <> nil) then

        begin

        if Ammoz[CurrentHedgehog^.CurAmmoType].Ammo.Propz and ammoprop_Timerable <> 0 then

            ParseTeamCommand('/timer ' + inttostr((GetCurAmmoEntry(CurrentHedgeHog^)^.Timer div 1000) mod 5 + 1));

        end;

    exit;

    end;

dec(buttonsDown);//no buttonsDown, undo the inc() above

if buttonsDown = 0 then

    begin

    moveCursor:= true;

    case pointerCount of

        1:

            targetting:= not(targetted) and (CurrentHedgehog <> nil) and (Ammoz[CurrentHedgehog^.CurAmmoType].Ammo.Propz and ammoprop_NeedTarget <> 0);

        2:

            begin

            moveCursor:= false;

            pinchSize := calculateDelta(finger^, getSecondFinger(finger^)^);

            baseZoomValue := ZoomValue

            end;

        end;

    end;

end;

procedure onTouchMotion(x, y, dx, dy: Single; pointerId: TSDL_FingerId);

var

    finger, secondFinger: PTouch_Data;

    currentPinchDelta, zoom : Single;

    xr, yr, dxr, dyr: LongWord;

begin

xr:= round(x * cScreenWidth);

yr:= round(y * cScreenHeight);

dxr:= round(dx * cScreenWidth);

dyr:= round(dy * cScreenHeight);

finger:= updateFinger(xr, yr, dxr, dyr, pointerId);

if finger = nil then

    exit;

if moveCursor then

    begin

        if invertCursor then

        begin

            CursorPoint.X := CursorPoint.X - finger^.dx;

            CursorPoint.Y := CursorPoint.Y + finger^.dy;

        end

    else

        begin

            CursorPoint.X := CursorPoint.X + finger^.dx;

            CursorPoint.Y := CursorPoint.Y - finger^.dy;

        end;

        exit //todo change into switch rather than ugly ifs

    end;

if aimingCrosshair then

    begin

        aim(finger^);

        exit

    end;

if (buttonsDown = 0) and (pointerCount = 2) then

    begin

       secondFinger := getSecondFinger(finger^);

       currentPinchDelta := calculateDelta(finger^, secondFinger^) - pinchSize;

       zoom := currentPinchDelta/cScreenWidth;

       ZoomValue := baseZoomValue - (zoom * cMinMaxZoomLevelDelta);

       if ZoomValue < cMaxZoomLevel then

           ZoomValue := cMaxZoomLevel;

       if ZoomValue > cMinZoomLevel then

           ZoomValue := cMinZoomLevel;

    end;

end;

procedure onTouchUp(x,y: Single; pointerId: TSDL_FingerId);

var

    finger: PTouch_Data;

    widget: POnScreenWidget;

    xr, yr: LongWord;

begin

xr:= round(x * cScreenWidth);

yr:= round(y * cScreenHeight);

finger:= updateFinger(xr, yr, 0, 0, pointerId);

if finger = nil then

    exit;

//Check for onTouchClick event

if not(fingerHasMoved(finger^)) then

    begin

    if (RealTicks - finger^.timeSinceDown) < clickTime then

        onTouchClick(finger^)

    else

        onTouchLongClick(finger^);

    end;

if aimingCrosshair then

    begin

    aimingCrosshair:= false;

    ParseTeamCommand('-up');

    ParseTeamCommand('-down');

    dec(buttonsDown);

    end;

widget:= finger^.pressedWidget;

if (buttonsDown > 0) and (widget <> nil) then

    begin

    dec(buttonsDown);

    if widget = @arrowLeft then

        ParseTeamCommand('-left');

    if widget = @arrowRight then

        ParseTeamCommand('-right');

    if widget = @arrowUp then

        ParseTeamCommand('-up');

    if widget = @arrowDown then

        ParseTeamCommand('-down');

    if widget = @fireButton then

        ParseTeamCommand('-attack');

    if widget = @utilityWidget then

        if (CurrentHedgehog <> nil)then

            if(Ammoz[CurrentHedgehog^.CurAmmoType].Ammo.Propz and ammoprop_NeedTarget <> 0)then

                begin

                ParseTeamCommand('put');

                targetted:= true;

                end

            else if (CurAmmoGear <> nil) and (CurAmmoGear^.AmmoType = amSwitch) then

                ParseTeamCommand('switch')

            else WriteLnToConsole(inttostr(ord(Ammoz[CurrentHedgehog^.CurAmmoType].NameId)) + ' ' + inttostr(ord(sidSwitch)));

    end;

if targetting then

    AddCaption(trmsg[sidPressTarget], cWhiteColor, capgrpAmmoInfo);

deleteFinger(pointerId);

end;

procedure onTouchDoubleClick(finger: TTouch_Data);

begin

finger := finger;//avoid compiler hint

end;

procedure onTouchLongClick(finger: TTouch_Data);

begin

if isOnWidget(jumpWidget, finger) then

    begin

    ParseTeamCommand('ljump');

    exit;

    end;

end;

procedure onTouchClick(finger: TTouch_Data);

begin

//if (RealTicks - timeSinceClick < 300) and (sqrt(sqr(finger.X-xTouchClick) + sqr(finger.Y-yTouchClick)) < 30) then

//    begin

//    onTouchDoubleClick(finger);

//    timeSinceClick:= 0;//we make an assumption there won't be an 'click' in the first 300 ticks(milliseconds)

//    exit;

//    end;

xTouchClick:= finger.x;

yTouchClick:= finger.y;

timeSinceClick:= RealTicks;

if bShowAmmoMenu then

    begin

    if isOnRect(AmmoRect, finger) then

        begin

        CursorPoint.X:= finger.x;

        CursorPoint.Y:= finger.y;

        ParseTeamCommand('put');

        end

    else

        bShowAmmoMenu:= false;

    exit;

    end;

if isOnCurrentHog(finger) or isOnWidget(AMWidget, finger) then

    begin

    bShowAmmoMenu := true;

    exit;

    end;

if isOnWidget(jumpWidget, finger) then

    begin

    ParseTeamCommand('hjump');

    exit;

    end;

end;

function addFinger(x,y: Longword; id: TSDL_FingerId): PTouch_Data;

var

    xCursor, yCursor, index : LongInt;

begin

// check array size

// note: pointerCount will be incremented later,

// so at this point it's the index of the new entry

if Length(fingers) <= pointerCount then

    begin

    setLength(fingers, Length(fingers)*2);

    for index := Length(fingers) div 2 to (Length(fingers)-1) do

        fingers[index].id := nilFingerId;

    end;

xCursor := convertToCursorX(x);

yCursor := convertToCursorY(y);

//on removing fingers, all fingers are moved to the left

//with dynamic arrays being zero based, the new position of the finger is the old pointerCount

fingers[pointerCount].id := id;

fingers[pointerCount].historicalX := xCursor;

fingers[pointerCount].historicalY := yCursor;

fingers[pointerCount].x := xCursor;

fingers[pointerCount].y := yCursor;

fingers[pointerCount].dx := 0;

fingers[pointerCount].dy := 0;

fingers[pointerCount].timeSinceDown:= RealTicks;

fingers[pointerCount].pressedWidget:= nil;

addFinger:= @fingers[pointerCount];

inc(pointerCount);

end;

function updateFinger(x, y, dx, dy: Longword; id: TSDL_FingerId): PTouch_Data;

var finger : PTouch_Data;

begin

finger:= findFinger(id);

if finger <> nil then

    begin

    finger^.x:= convertToCursorX(x);

    finger^.y:= convertToCursorY(y);

    finger^.dx:= dx;

    finger^.dy:= dy;

    end

else

    WriteLnToConsole('finger ' + inttostr(id) + ' not found');

updateFinger:= finger

end;

procedure deleteFinger(id: TSDL_FingerId);

var

    index : Longword;

begin

dec(pointerCount);

for index := 0 to pointerCount do

    begin

    if fingers[index].id = id then

        begin

        //put the last finger into the spot of the finger to be removed,

        //so that all fingers are packed to the far left

        if pointerCount <> index then

            begin

            fingers[index].id := fingers[pointerCount].id;

            fingers[index].x := fingers[pointerCount].x;

            fingers[index].y := fingers[pointerCount].y;

            fingers[index].historicalX := fingers[pointerCount].historicalX;

            fingers[index].historicalY := fingers[pointerCount].historicalY;

            fingers[index].timeSinceDown := fingers[pointerCount].timeSinceDown;

            fingers[index].pressedWidget := fingers[pointerCount].pressedWidget;

            fingers[pointerCount].id := nilFingerId;

            end

        else

            fingers[index].id := nilFingerId;

        break;

        end;

    end;

end;

procedure NewTurnBeginning;

begin

targetted:= false;

targetting:= false;

SetUtilityWidgetState(amNothing);

end;

procedure ProcessTouch;

var

    deltaAngle: LongInt;

begin

invertCursor := not(bShowAmmoMenu or targetting);

if aimingCrosshair then

    if CurrentHedgehog^.Gear <> nil then

        begin

        deltaAngle:= CurrentHedgehog^.Gear^.Angle - targetAngle;

        if (deltaAngle > -5) and (deltaAngle < 5) then

            begin

                if(aimingUp)then

                    begin

                    aimingUp:= false;

                    ParseTeamCommand('-up');

                    end;

                if(aimingDown)then

                    begin

                    aimingDown:= false;

                    ParseTeamCommand('-down');

                    end

            end

        else

            begin

            if (deltaAngle < 0) then

                begin

                if aimingUp then

                    begin

                    aimingUp:= false;

                    ParseTeamCommand('-up');

                    end;

                if(aimingDown)then

                    begin

                    aimingDown:= true;

                    ParseTeamCommand('-down');

                    end