#include "zoomhandler.h"

#include "CommonDef.h"
#include "reticle/poshelper.h"

ZoomHandler::ZoomHandler(QObject* parent)
    : QObject(parent)
{
}

void ZoomHandler::init(const QSize &backgroundSize)
{
    m_backgroundSize = backgroundSize;
}

void ZoomHandler::zoomIn()
{
    m_curZoom = (m_curZoom + m_zoomStep);
    if (m_curZoom > m_zoomMax)
        m_curZoom = m_zoomMax;

    changeZoom();
}

void ZoomHandler::zoomOut()
{
    m_curZoom = (m_curZoom - m_zoomStep);
    if (m_curZoom < m_zoomMin)
        m_curZoom = m_zoomMin;

    changeZoom();
}

int ZoomHandler::getZoomValue() const
{
    return m_curZoom;
}

QRect ZoomHandler::getZoomRect() const
{
    return m_zoomRect;
}

QPoint ZoomHandler::getReticleCenterOffset() const
{
    return m_centerOffset;
}

void ZoomHandler::setReticleCenterOffset(QPoint centerOffset)
{
    m_centerOffset = centerOffset;
    changeZoom();
}

void ZoomHandler::changeZoom()
{
    //1.计算新的缩放区域, zoom manager 调用 scale接口
    m_zoomRect = PosHelper::GetScaleRect(m_curZoom, m_centerOffset, m_backgroundSize.width(), m_backgroundSize.height());

    // 调用底层scale接口

    emit sglZoomRectChanged(m_zoomRect); //发送ZoomRect信号到HotTrack,重新计算热点区域(此demo没有热点handler)

    //2.计算在当前倍率下, 分化线中心点在屏幕上的位置
    QPoint pt = PosHelper::GetPoint(m_zoomRect, m_centerOffset, m_backgroundSize.width(), m_backgroundSize.height());

    //发送信号,分化线中心点位置变化,需要重新计算画中画源区域(发送给pipHandler)
    emit sglOriginZoomCenterChanged(pt, m_curZoom);
}