oxygine-framework/examples/Game/part1/src/Joystick.cpp

#include "Joystick.h"
#include "res.h"

Joystick::Joystick(): _pressed(false), _dir(0, 0)
{
    setResAnim(res::ui.getResAnim("joystick"));
    setAlpha(128);

    //handle touch events
    addEventListener(TouchEvent::TOUCH_DOWN, CLOSURE(this, &Joystick::onEvent));
    addEventListener(TouchEvent::TOUCH_UP, CLOSURE(this, &Joystick::onEvent));
    addEventListener(TouchEvent::MOVE, CLOSURE(this, &Joystick::onEvent));

    _finger = new Sprite;
    _finger->setResAnim(res::ui.getResAnim("finger"));
    _finger->attachTo(this);
    _finger->setVisible(false);
    _finger->setAnchor(Vector2(0.5f, 0.5f));
    _finger->setTouchEnabled(false);
}

void Joystick::onEvent(Event* ev)
{
    TouchEvent* te = safeCast<TouchEvent*>(ev);

    //if player touched down
    if (te->type == TouchEvent::TOUCH_DOWN)
    {
        _finger->setVisible(true);
        setColor(Color::Red);
        _pressed = true;
    }

    //if player touched up
    if (te->type == TouchEvent::TOUCH_UP)
    {
        _finger->setVisible(false);
        setColor(Color::White);
        _pressed = false;
    }

    if (te->type == TouchEvent::MOVE)
    {
    }

    Vector2 center = getSize() / 2;
    _dir = te->localPosition - center;

    if (_dir.length() > 100)
        _dir.normalizeTo(100);

    _finger->setPosition(center + _dir);

    if (!_pressed)
    {
        _dir = Vector2(0, 0);
    }
}

bool Joystick::getDirection(Vector2& dir) const
{
    dir = _dir;
    return _pressed;
}