#include "screen/ScreenPlane.h"

using namespace projection;

/**
 * Constructor.
 *
 * @param pScreen Screen data.
 */
ScreenPlane::ScreenPlane(Screen* pScreen) : ScreenShape(pScreen)
{
    m_width = 2.0;
    m_height = 2.0;
    m_horResolution = 4;
    m_vertResolution = 4;
}

/**
 * Destructor.
 */
ScreenPlane::~ScreenPlane()
{
}

/**
 * Set width of the plane screen.
 *
 * @param width Width of the plane screen.
 */
void ScreenPlane::setWidth(double width)
{
    if (m_width != width)
    {
        m_width = width;
        notifyRedraw();
    }
}

/**
 * Set height of the plane screen.
 *
 * @param height Height of the plane screen.
 */
void ScreenPlane::setHeight(double height)
{
    if (m_height != height)
    {
        m_height = height;
        notifyRedraw();
    }
}

/**
 * Set horizontal resolution of the plane screen.
 *
 * @param resolution Horizontal resolution of the plane screen.
 */
void ScreenPlane::setHorResolution(unsigned int resolution)
{
    m_horResolution = resolution;
    notifyRedraw();
}

/**
 * Set vertical resolution of the plane screen.
 *
 * @param resolution Vertical resolution of the plane screen.
 */
void ScreenPlane::setVertResolution(unsigned int resolution)
{
    m_vertResolution = resolution;
    notifyRedraw();
}

/**
 * Retrieve bounding box of the screen shape.
 *
 * @param min One corner of the screen shape.
 * @param max Another corner of the screen shape.
 */
void ScreenPlane::getBoundingBox(gmtl::Vec3f& min, gmtl::Vec3f& max)
{
    min.set((float)-m_width/2.0f, (float)-m_height/2.0f, 0.0f);
    max.set((float)m_width/2.0f, (float)m_height/2.0f, 0.0f);
}

/**
 * Restore the screen shape from XML data.
 *
 * @param element Parent XML element of the screen shape data.
 */
bool ScreenPlane::initFromDOMElement(const QDomElement& element)
{
    if (!element.isNull())
    {
        m_width = element.attribute("width").toFloat();
        m_height = element.attribute("height").toFloat();
        m_horResolution = element.attribute("horResolution").toInt();
        m_vertResolution = element.attribute("vertResolution").toInt();
        // if change
        notifyRedraw();
    }

	return true;	// todo: secure this function and return false on any critical error
}

/**
 * Store the current screen shape as XML data.
 *
 * @param name XML node name of the data.
 * @param doc XML document to store the data.
 * @return Current screen shape data as XML data.
 */
QDomElement ScreenPlane::domElement(const QString& name, QDomDocument& doc) const
{
    QDomElement de = doc.createElement(name);
    de.setAttribute("name", getName());
    de.setAttribute("width", m_width);
    de.setAttribute("height", m_height);
    de.setAttribute("horResolution", m_horResolution);
    de.setAttribute("vertResolution", m_vertResolution);

    return de;
}

/**
 * Draw the shape model in inherited class.
 *
 * @param bFrame True to draw a wire frame mesh. False to draw as a polygon model.
 */
void ScreenPlane::drawShape(bool)
{
    double horDelta = m_width / m_horResolution;
    double vertDelta = m_height / m_vertResolution;

    for (unsigned int vertCount=0; vertCount<m_vertResolution; ++vertCount)
    {
        glBegin(GL_QUAD_STRIP);
        for (unsigned int horCount=0; horCount<=m_horResolution; ++horCount)
        {
            glNormal3d(0, 0, 1);
            glVertex3d(m_width/2.0 - horDelta*horCount,
                       -m_height/2.0 + vertDelta*vertCount,
                       0.0);
            glNormal3d(0, 0, 1);
            glVertex3d(m_width/2.0 - horDelta*(horCount),
                       -m_height/2.0 + vertDelta*(vertCount+1),
                       0.0);
        }
        glEnd();
    }
}