YwJoystick.cs

using UnityEngine;
using System.Collections;

/**
 * File: YwJoystick.cs
 * Author: Chris Danielson of (monkeyprism.com)
 *
// USED TO BE: Joystick.js taken from Penelope iPhone Tutorial
//
// Joystick creates a movable joystick (via GUITexture) that
// handles touch input, taps, and phases. Dead zones can control
// where the joystick input gets picked up and can be normalized.
//
// Optionally, you can enable the touchPad property from the editor
// to treat this Joystick as a TouchPad. A TouchPad allows the finger
// to touch down at any point and it tracks the movement relatively
// without moving the graphic
*/

[RequireComponent(typeof(GUITexture))]

public class YwJoystick : MonoBehaviour
{
class Boundary {
public Vector2 min = Vector2.zero;
public Vector2 max = Vector2.zero;
}

private static YwJoystick[] joysticks; // A static collection of all joysticks
private static bool enumeratedJoysticks = false;
private static float tapTimeDelta = 0.3f; // Time allowed between taps

public bool touchPad;
public Vector2 position = Vector2.zero;
public Rect touchZone;
public Vector2 deadZone = Vector2.zero; // Control when position is output
public bool normalize = false; // Normalize output after the dead-zone?
public int tapCount;

private int lastFingerId = -1; // Finger last used for this joystick
private float tapTimeWindow; // How much time there is left for a tap to occur
private Vector2 fingerDownPos;
//private float fingerDownTime;
//private float firstDeltaTime = 0.5f;

private GUITexture gui;
private Rect defaultRect; // Default position / extents of the joystick graphic
private Boundary guiBoundary = new Boundary(); // Boundary for joystick graphic
private Vector2 guiTouchOffset; // Offset to apply to touch input
private Vector2 guiCenter; // Center of joystick

void Start() {
gui = (GUITexture)GetComponent(typeof(GUITexture));

defaultRect = gui.pixelInset;
defaultRect.x += transform.position.x * Screen.width;// + gui.pixelInset.x; // -  Screen.width * 0.5;
defaultRect.y += transform.position.y * Screen.height;// - Screen.height * 0.5;

transform.position = Vector3.zero;

if (touchPad) {
// If a texture has been assigned, then use the rect ferom the gui as our touchZone
if ( gui.texture )
touchZone = defaultRect;
} else {
guiTouchOffset.x = defaultRect.width * 0.5f;
guiTouchOffset.y = defaultRect.height * 0.5f;

// Cache the center of the GUI, since it doesn't change
guiCenter.x = defaultRect.x + guiTouchOffset.x;
guiCenter.y = defaultRect.y + guiTouchOffset.y;

// Let's build the GUI boundary, so we can clamp joystick movement
guiBoundary.min.x = defaultRect.x - guiTouchOffset.x;
guiBoundary.max.x = defaultRect.x + guiTouchOffset.x;
guiBoundary.min.y = defaultRect.y - guiTouchOffset.y;
guiBoundary.max.y = defaultRect.y + guiTouchOffset.y;
}
}

public Vector2 getGUICenter() {
return guiCenter;
}

void Disable() {
gameObject.active = false;
//enumeratedJoysticks = false;
}

private void ResetJoystick() {
gui.pixelInset = defaultRect;
lastFingerId = -1;
position = Vector2.zero;
fingerDownPos = Vector2.zero;
}

private bool IsFingerDown() {
return (lastFingerId != -1);
}

public void LatchedFinger(int fingerId) {
// If another joystick has latched this finger, then we must release it
if ( lastFingerId == fingerId )
ResetJoystick();
}

void Update() {
if (!enumeratedJoysticks) {
// Collect all joysticks in the game, so we can relay finger latching messages
joysticks = (YwJoystick[])FindObjectsOfType(typeof(YwJoystick));
enumeratedJoysticks = true;
}

int count = Input.touchCount;

if ( tapTimeWindow > 0 )
tapTimeWindow -= Time.deltaTime;
else
tapCount = 0;

if ( count == 0 )
ResetJoystick();
else
{
for(int i = 0; i < count; i++) {
Touch touch = Input.GetTouch(i);
Vector2 guiTouchPos = touch.position - guiTouchOffset;

bool shouldLatchFinger = false;
if (touchPad) {
if (touchZone.Contains(touch.position))
shouldLatchFinger = true;
}
else if (gui.HitTest(touch.position)) {
shouldLatchFinger = true;
}

// Latch the finger if this is a new touch
if (shouldLatchFinger && (lastFingerId == -1 || lastFingerId != touch.fingerId )) {

if (touchPad) {
//gui.color.a = 0.15;
lastFingerId = touch.fingerId;
//fingerDownPos = touch.position;
//fingerDownTime = Time.time;
}

lastFingerId = touch.fingerId;

// Accumulate taps if it is within the time window
if ( tapTimeWindow > 0 )
tapCount++;
else {
tapCount = 1;
tapTimeWindow = tapTimeDelta;
}

// Tell other joysticks we've latched this finger
//for (  j : Joystick in joysticks )
foreach (YwJoystick j in joysticks) {
if (j != this)
j.LatchedFinger( touch.fingerId );
}
}

if ( lastFingerId == touch.fingerId ) {
// Override the tap count with what the iPhone SDK reports if it is greater
// This is a workaround, since the iPhone SDK does not currently track taps
// for multiple touches
if ( touch.tapCount > tapCount )
tapCount = touch.tapCount;

if ( touchPad ) {
// For a touchpad, let's just set the position directly based on distance from initial touchdown
position.x = Mathf.Clamp( ( touch.position.x - fingerDownPos.x ) / ( touchZone.width / 2 ), -1, 1 );
position.y = Mathf.Clamp( ( touch.position.y - fingerDownPos.y ) / ( touchZone.height / 2 ), -1, 1 );
} else {
// Change the location of the joystick graphic to match where the touch is
Rect r = gui.pixelInset;
r.x =  Mathf.Clamp( guiTouchPos.x, guiBoundary.min.x, guiBoundary.max.x );
r.y =  Mathf.Clamp( guiTouchPos.y, guiBoundary.min.y, guiBoundary.max.y );
gui.pixelInset = r;
}

if (touch.phase == TouchPhase.Ended || touch.phase == TouchPhase.Canceled)
ResetJoystick();
}
}
}

if (!touchPad) {
// Get a value between -1 and 1 based on the joystick graphic location
position.x = ( gui.pixelInset.x + guiTouchOffset.x - guiCenter.x ) / guiTouchOffset.x;
position.y = ( gui.pixelInset.y + guiTouchOffset.y - guiCenter.y ) / guiTouchOffset.y;
}

// Adjust for dead zone
var absoluteX = Mathf.Abs( position.x );
var absoluteY = Mathf.Abs( position.y );

if (absoluteX < deadZone.x) {
// Report the joystick as being at the center if it is within the dead zone
position.x = 0;
}
else if (normalize) {
// Rescale the output after taking the dead zone into account
position.x = Mathf.Sign( position.x ) * ( absoluteX - deadZone.x ) / ( 1 - deadZone.x );
}

if (absoluteY < deadZone.y) {
// Report the joystick as being at the center if it is within the dead zone
position.y = 0;
}
else if (normalize) {
// Rescale the output after taking the dead zone into account
position.y = Mathf.Sign( position.y ) * ( absoluteY - deadZone.y ) / ( 1 - deadZone.y );
}

}

}