#include "HelloWorld.h"

USING_NS_CC;

bool HelloWorld::init()
{
    if ( !Scene::init() )
		return false;

    // Init graphics object
    m_graphics.init( this );

    this->scheduleUpdate();

    return true;
}

void HelloWorld::update( float dt )
{
    // Get stage size
    auto size = Director::getInstance()->getVisibleSize();
    int width = size.width;
    int height = size.height;

    // Clear the old lines & fills
    m_graphics.clear();

    m_graphics.lineStyle( 1, 0x0000FFFF );
    m_graphics.beginFill( 0x0000FF7F );

    // Timer for animation
    static float t = 0.0f;

    // Flag to use moveTo(x,y) for the first node
    bool bFirst = true;

    // Remember start coordinate for closing the shape
    float firstX, firstY;

    float x1 = 0;
    float x2 = width;
    float y1 = height - 100;

    // Current draw coordinate
    float _x, _y;

    for ( _x = x1; _x < x2; _x += 15.0f )
    {
        _y = (int)(y1 + sinf( (_x)*0.05f + t ) * (cos( t + _x * 0.007f ) * 15.0f));

        if ( bFirst == false )
            m_graphics.lineTo( _x, _y );
        else
        {
            firstX = _x;
            firstY = _y;
            m_graphics.moveTo( _x, _y );
            bFirst = false;
        }

    }

    m_graphics.lineTo( x2, _y );
    m_graphics.lineTo( x2, height );
    m_graphics.lineTo( x1, height );
    m_graphics.lineTo( firstX, firstY - 1 );

    // Fill polygon
    m_graphics.endFill();

    t += 0.06f;
}

/////////////////////////////////

Scene* HelloWorld::createScene()
{
    return HelloWorld::create();
}