{$INCLUDE "options.inc"}

unit uTouch;

interface

uses sysutils, math, uConsole, uVariables, SDLh, uTypes, uFloat, uConsts, uIO, uCommands, GLUnit, uCommandHandlers;

type

    Touch_Finger = record

        id                       : SDL_FingerId;

        x,y                      : LongInt;

        historicalX, historicalY : LongInt;

        timeSinceDown            : Longword;

        end;

procedure initModule;

procedure ProcessTouch;

procedure onTouchDown(x,y: Longword; pointerId: SDL_FingerId);

procedure onTouchMotion(x,y: Longword; dx,dy: LongInt; pointerId: SDL_FingerId);

procedure onTouchUp(x,y: Longword; pointerId: SDL_FingerId);

function convertToCursor(scale: LongInt; xy: LongInt): LongInt;

function addFinger(x,y: Longword; id: SDL_FingerId): Touch_Finger;

procedure deleteFinger(id: SDL_FingerId);

procedure onTouchClick(finger: Touch_Finger);

function findFinger(id: SDL_FingerId): Touch_Finger;

procedure aim(finger: Touch_Finger);

function isOnCrosshair(finger: Touch_Finger): boolean;

function isOnCurrentHog(finger: Touch_Finger): boolean;

function isOnFireButton(finger: Touch_Finger): boolean;

procedure convertToWorldCoord(var x,y: hwFloat; finger: Touch_Finger);

function fingerHasMoved(finger: Touch_Finger): boolean;

function calculateDelta(finger1, finger2: Touch_Finger): hwFloat;

function getSecondFinger(finger: Touch_Finger): Touch_Finger;

implementation

const

    clicktime = 200;

var

    leftButtonBoundary  : LongInt;

    rightButtonBoundary : LongInt;

    topButtonBoundary   : LongInt;

    pointerCount : Longword;

    fingers: array of Touch_Finger;

    moveCursor : boolean;

    //Pinch to zoom 

    pinchSize : hwFloat;

    baseZoomValue: GLFloat;

    //aiming

    aiming, movingCrosshair: boolean; 

    crosshairCommand: ShortString;

    targetAngle: LongInt;

    stopFiring: boolean;

    //moving

    stopLeft, stopRight, walkingLeft, walkingRight :  boolean;

procedure printFinger(finger: Touch_Finger);

begin

    WriteToConsole(Format('id:%d, (%d,%d), (%d,%d), time: %d', [finger.id, finger.x, finger.y, finger.historicalX, finger.historicalY, finger.timeSinceDown]));

end;

procedure onTouchDown(x,y: Longword; pointerId: SDL_FingerId);

var 

    finger: Touch_Finger;

begin

    finger:= addFinger(x,y,pointerId);

    finger.x := convertToCursor(cScreenWidth,x);

    finger.y := convertToCursor(cScreenHeight,y);

    printFinger(finger); 

    case pointerCount of

        1:

        begin

            moveCursor:= false;

            if bShowAmmoMenu then

            begin

                moveCursor := true;

                exit;

            end;

            if isOnCrosshair(finger) then

            begin

                aiming:= true;

                exit;

            end;

            if isOnFireButton(finger) then

            begin

                stopFiring:= false;

                ParseCommand('+attack', true);

                exit;

            end;

            if finger.x < leftButtonBoundary then

            begin

                ParseCommand('+left', true);

                walkingLeft := true;

                exit;

            end;

            if finger.x > rightButtonBoundary then

            begin

                ParseCommand('+right', true);

                walkingRight:= true;

                exit;

            end;

            if finger.y < topButtonBoundary then

            begin

                ParseCommand('hjump', true);

                exit;

            end;

            moveCursor:= true; 

        end;

        2:

        begin

            aiming:= false;

            stopFiring:= true;

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

            baseZoomValue := ZoomValue

        end;

    end;//end case pointerCount of

end;

procedure onTouchMotion(x,y: Longword;dx,dy: LongInt; pointerId: SDL_FingerId);

var

    finger, secondFinger: Touch_Finger;

    currentPinchDelta, zoom : hwFloat;

begin

    finger:= findFinger(pointerId);

    finger.x := convertToCursor(cScreenWidth, x);

    finger.y := convertToCursor(cScreenHeight, y);

    case pointerCount of

       1:

           begin

               if aiming then 

               begin

                   aim(finger);

                   exit

               end;

               if moveCursor then

                   if invertCursor then

                   begin

                       CursorPoint.X := CursorPoint.X - convertToCursor(cScreenWidth,dx);

                       CursorPoint.Y := CursorPoint.Y + convertToCursor(cScreenWidth,dy);

                   end

                   else

                   begin

                       CursorPoint.X := CursorPoint.X + convertToCursor(cScreenWidth,dx);

                       CursorPoint.Y := CursorPoint.Y - convertToCursor(cScreenWidth,dy);

                   end;

           end;

       2:

           begin

               secondFinger := getSecondFinger(finger);

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

               zoom := currentPinchDelta/cScreenWidth;

               ZoomValue := baseZoomValue - ((hwFloat2Float(zoom) * cMinMaxZoomLevelDelta));

               if ZoomValue < cMaxZoomLevel then ZoomValue := cMaxZoomLevel;

               if ZoomValue > cMinZoomLevel then ZoomValue := cMinZoomLevel;

            end;

    end; //end case pointerCount of

end;

procedure onTouchUp(x,y: Longword; pointerId: SDL_FingerId);

begin

    aiming:= false;

    stopFiring:= true;

    deleteFinger(pointerId);

    if walkingLeft then

    begin

        ParseCommand('-left', true);

        walkingLeft := false;

    end;

    if walkingRight then

    begin

        ParseCommand('-right', true);

        walkingRight := false;

    end;

end;

procedure onTouchClick(finger: Touch_Finger);

begin

    if bShowAmmoMenu then 

    begin

        doPut(CursorPoint.X, CursorPoint.Y, false); 

        exit

    end;

    if isOnCurrentHog(finger) then

    begin

        bShowAmmoMenu := true;

        exit;

    end;

    if finger.y < topButtonBoundary then

    begin

        ParseCommand('hjump', true);

        exit;

    end;

end;

function addFinger(x,y: Longword; id: SDL_FingerId): Touch_Finger;

var 

    xCursor, yCursor, index : LongInt;

begin

    //Check array sizes

    if length(fingers) < pointerCount then 

    begin

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

        for index := length(fingers) div 2 to length(fingers) do fingers[index].id := -1;

    end;

    xCursor := convertToCursor(cScreenWidth, x);

    yCursor := convertToCursor(cScreenHeight, y);

    //on removing fingers all fingers are moved to the left, thus new fingers will be to the far right

    //with dynamic arrays being zero based, 'far right' 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].timeSinceDown:= SDL_GetTicks;

    inc(pointerCount);

    addFinger:= fingers[pointerCount];

end;

procedure deleteFinger(id: SDL_FingerId);

var

    index : Longint;

begin

    dec(pointerCount);

    for index := 0 to pointerCount do

    begin

         if fingers[index].id = id then

         begin

             //Check for onTouchevent

             if ((SDL_GetTicks - fingers[index].timeSinceDown) < clickTime) AND  not(fingerHasMoved(fingers[index])) then 

                 onTouchClick(fingers[index]);

             fingers[index].id := -1;

             break;

         end;

    end;

    //put the last finger into the spot of the finger to be removed, so that all fingers are packed to the far left

    if fingers[pointerCount].id = -1 then

    begin

        fingers[index] := fingers[pointerCount];    

        fingers[pointerCount].id := -1;

    end;

end;

procedure ProcessTouch;

var

    deltaAngle: LongInt;

begin

    invertCursor := not(bShowAmmoMenu);

    if aiming then

    begin

        if CurrentHedgehog^.Gear <> nil then

        begin

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

            if (deltaAngle <> 0) and not(movingCrosshair) then 

            begin

                ParseCommand('+' + crosshairCommand, true);

                movingCrosshair := true;

            end

            else 

                if movingCrosshair then 

                begin

                    ParseCommand('-' + crosshairCommand, true);

                    movingCrosshair:= false;

                end;

        end;

    end

    else if movingCrosshair then 

    begin

        ParseCommand('-' + crosshairCommand, true);

        movingCrosshair := false;

    end;

    if stopFiring then 

    begin

        ParseCommand('-attack', true);

        stopFiring:= false;

    end;

    if stopRight then

    begin

        stopRight := false;

        ParseCommand('-right', true);

    end;

    if stopLeft then

    begin

        stopLeft := false;

        ParseCommand('-left', true);

    end;

end;

function findFinger(id: SDL_FingerId): Touch_Finger;

begin

   for findFinger in fingers do

       if (findFinger.id = -1) and (findFinger.id = id) then break;

end;

procedure aim(finger: Touch_Finger);

var 

    hogX, hogY, touchX, touchY, deltaX, deltaY, tmpAngle: hwFloat;

    tmp: ShortString;

begin

    if CurrentHedgehog^.Gear <> nil then

    begin

        hogX := CurrentHedgehog^.Gear^.X;

        hogY := CurrentHedgehog^.Gear^.Y;

        convertToWorldCoord(touchX, touchY, finger);

        deltaX := hwAbs(TouchX-HogX);

        deltaY := (TouchY-HogY);

        tmpAngle:= DeltaY / Distance(deltaX, deltaY) *_2048;

        targetAngle:= (hwRound(tmpAngle) + 2048) div 2;

        tmp := crosshairCommand;

        if CurrentHedgehog^.Gear^.Angle - targetAngle < 0 then crosshairCommand := 'down'

        else crosshairCommand:= 'up';

        if movingCrosshair and (tmp <> crosshairCommand) then 

        begin

            ParseCommand('-' + tmp, true);

            movingCrosshair := false;

        end;

    end; //if CurrentHedgehog^.Gear <> nil

end;

function convertToCursor(scale: LongInt; xy: LongInt): LongInt;

begin

    convertToCursor := round(xy/32768*scale)

end;

function isOnFireButton(finger: Touch_Finger): boolean;

begin

    isOnFireButton:= (finger.x < 150) and (finger.y > 390);

end;

function isOnCrosshair(finger: Touch_Finger): boolean;

var

    x,y,fingerX, fingerY : hwFloat;

begin

    x := int2hwFloat(CrosshairX);

    y := int2hwFloat(CrosshairY);

    convertToWorldCoord(fingerX, fingerY, finger);

    isOnCrosshair:= Distance(fingerX-x, fingerY-y) < _20;

end;

function isOnCurrentHog(finger: Touch_Finger): boolean;

var

    x,y, fingerX, fingerY : hwFloat;

begin

    x := CurrentHedgehog^.Gear^.X;

    y := CurrentHedgehog^.Gear^.Y;

    convertToWorldCoord(fingerX, fingerY, finger);

    isOnCurrentHog := Distance(fingerX-x, fingerY-y) < _20;

end;

procedure convertToWorldCoord(var x,y: hwFloat; finger: Touch_Finger);

begin

//if x <> nil then 

    x := int2hwFloat((finger.x-WorldDx) - (cScreenWidth div 2));

//if y <> nil then 

    y := int2hwFloat(finger.y-WorldDy);

end;

//Method to calculate the distance this finger has moved since the downEvent

function fingerHasMoved(finger: Touch_Finger): boolean;

begin

    fingerHasMoved := trunc(sqrt(Power(finger.X-finger.historicalX,2) + Power(finger.y-finger.historicalY, 2))) > 330;

end;

function calculateDelta(finger1, finger2: Touch_Finger): hwFloat;

begin

//    calculateDelta := Distance(xyCoord[id2*2] - xyCoord[id1*2], xyCoord[id2*2+1] - xyCoord[id1*2+1]);

    calculateDelta := int2hwFloat(trunc(sqrt(Power(finger2.x-finger1.x, 2) + Power(finger2.y-finger1.y, 2))));

end;

// Under the premise that all pointer ids in pointerIds:SDL_FingerId are pack to the far left.

// If the pointer to be ignored is not pointerIds[0] the second must be there

function getSecondFinger(finger: Touch_Finger): Touch_Finger;

begin

    if fingers[0].id = finger.id then getSecondFinger := fingers[0]

    else getSecondFinger := fingers[1];

end;

procedure initModule;

var

    finger: Touch_Finger;

begin

    movingCrosshair := false;

    stopFiring:= false;

    walkingLeft := false;

    walkingRight := false;

    leftButtonBoundary := cScreenWidth div 4;

    rightButtonBoundary := cScreenWidth div 4*3;

    topButtonBoundary := cScreenHeight div 6;

    setLength(fingers, 5);

    for finger in fingers do finger.id := -1;

end;

begin

end.