SneakyJoystick.cpp

#include "SneakyJoystick.h"

using namespace cocos2d;

#define SJ_PI 3.14159265359f
#define SJ_PI_X_2 6.28318530718f
#define SJ_RAD2DEG 180.0f/SJ_PI
#define SJ_DEG2RAD SJ_PI/180.0f

SneakyJoystick::~SneakyJoystick()
{
}

bool SneakyJoystick::initWithRect(CCRect rect)
{
	bool pRet = false;
	//if(CCSprite::init()){
		stickPosition = CCPointZero;
		degrees = 0.0f;
		velocity = CCPointZero;
		autoCenter = true;
		isDPad = false;
		hasDeadzone = false;
		numberOfDirections = 4;
		
		this->setJoystickRadius(rect.size.width/2);
		this->setThumbRadius(32.0f);
		this->setDeadRadius(0.0f);
		
		//Cocos node stuff
		setPosition(rect.origin);
		pRet = true;
	//}
	return pRet;
}

void SneakyJoystick::onEnterTransitionDidFinish()
{
    mEventListenerTouch = EventListenerTouchOneByOne::create();
    mEventListenerTouch->onTouchBegan = CC_CALLBACK_2(SneakyJoystick::onTouchBegan, this);
    mEventListenerTouch->onTouchMoved = CC_CALLBACK_2(SneakyJoystick::onTouchMoved, this);
    mEventListenerTouch->onTouchEnded = CC_CALLBACK_2(SneakyJoystick::onTouchEnded, this);
    mEventListenerTouch->onTouchCancelled = CC_CALLBACK_2(SneakyJoystick::onTouchCancelled, this);
    Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraphPriority(mEventListenerTouch, this);

}

void SneakyJoystick::onExit()
{
	Director::getInstance()->getEventDispatcher()->removeEventListener(mEventListenerTouch);
}

float round(float r) {
    return (r > 0.0) ? floor(r + 0.5) : ceil(r - 0.5);
}

void SneakyJoystick::updateVelocity(CCPoint point)
{
	// Calculate distance and angle from the center.
	float dx = point.x;
	float dy = point.y;
	float dSq = dx * dx + dy * dy;
	
	if(dSq <= deadRadiusSq){
		velocity = CCPointZero;
		degrees = 0.0f;
		stickPosition = point;
		return;
	}

	float angle = atan2f(dy, dx); // in radians
	if(angle < 0){
		angle		+= SJ_PI_X_2;
	}
	float cosAngle;
	float sinAngle;
	
	if(isDPad){
		float anglePerSector = 360.0f / numberOfDirections * SJ_DEG2RAD;
		angle = round(angle/anglePerSector) * anglePerSector;
	}
	
	cosAngle = cosf(angle);
	sinAngle = sinf(angle);
	
	// NOTE: Velocity goes from -1.0 to 1.0.
	if (dSq > joystickRadiusSq || isDPad) {
		dx = cosAngle * joystickRadius;
		dy = sinAngle * joystickRadius;
	}
	
	velocity = CCPointMake(dx/joystickRadius, dy/joystickRadius);
	degrees = angle * SJ_RAD2DEG;
	
	// Update the thumb's position
	stickPosition = ccp(dx, dy);
}

void SneakyJoystick::setIsDPad(bool b)
{
	isDPad = b;
	if(isDPad){
		hasDeadzone = true;
		this->setDeadRadius(10.0f);
	}
}

void SneakyJoystick::setJoystickRadius(float r)
{
	joystickRadius = r;
	joystickRadiusSq = r*r;
}

void SneakyJoystick::setThumbRadius(float r)
{
	thumbRadius = r;
	thumbRadiusSq = r*r;
}

void SneakyJoystick::setDeadRadius(float r)
{
	deadRadius = r;
	deadRadiusSq = r*r;
}

bool SneakyJoystick::onTouchBegan(Touch* touch, Event* event)
{
	CCPoint location = CCDirector::sharedDirector()->convertToGL(touch->getLocationInView());

	//if([background containsPoint:[background convertToNodeSpace:location]]){
	location = this->convertToNodeSpace(location);
	//Do a fast rect check before doing a circle hit check:
	if(location.x < -joystickRadius || location.x > joystickRadius || location.y < -joystickRadius || location.y > joystickRadius){
		return false;
	}else{
		float dSq = location.x*location.x + location.y*location.y;
		if(joystickRadiusSq > dSq){
			this->updateVelocity(location);
			return true;
		}
	}
	return false;
}

void SneakyJoystick::onTouchMoved(Touch* touch, Event* event)
{
	CCPoint location = CCDirector::sharedDirector()->convertToGL(touch->getLocationInView());
	location = this->convertToNodeSpace(location);
	this->updateVelocity(location);
}

void SneakyJoystick::onTouchEnded(Touch* touch, Event* event)
{
	CCPoint location = CCPointZero;
	if(!autoCenter){
		CCPoint location = CCDirector::sharedDirector()->convertToGL(touch->getLocationInView());
		location = this->convertToNodeSpace(location);
	}
	this->updateVelocity(location);
}

void SneakyJoystick::onTouchCancelled(Touch* touch, Event* event)
{
	this->onTouchEnded(touch, event);
}