expstripchartitem.cpp

#include <QtMath>
#include <QPainter>

#include "expstripchartitem.h"
#include "anserglobal.h"

ExpStripChartItem::ExpStripChartItem(QQuickPaintedItem *parent):
    BaseChartItem(parent),
    m_expTp(0),
    m_xComponent(false)
{

}


bool ExpStripChartItem::transform()
{

    if(m_data.empty() || m_expTp < 0) return false;

    int k;
    short base;
    int a,b,c,vxavg,vyavg,cent;
    int vx,vy,pnt;
    int x1, y1;

    if(height() < 2)
        return false;

    m_points.clear();
    const int spacing = 20;
    int dataIdx = 0;
    LissDataMap::iterator dataIt = m_data.begin();
    for (; dataIt != m_data.end(); dataIt++) {
        Channel* channel = dataIt.value();
        if(m_expTp > channel->getData().count()) return false;
        ChannelParam& cp = channel->getCp();
        if(cp.xavg == 0){
            AnserGlobal::calAvgXY(channel, cp.xavg, cp.yavg);
        }
        vxavg = cp.xavg;
        vyavg = cp.yavg;

        /* get transformation coefficients */
        const int FACTOR = 100;
        float theta = M_PI * cp.rot/180.0;
        a = FACTOR * width() * qCos(theta);
        b = FACTOR * width() * qSin(theta);
        c = FACTOR * cp.span;

        cent = width()/2 + dataIdx*spacing;
        dataIdx++;
        if (c==0) c=1;

        /* setup y coordinates */
        base = (height()-1);
        pnt = m_expTp;

        QVector<QPointF>& points = m_points[dataIt.key()];
        points.clear();

        for(k = 0; k < height(); ++k){
            y1 = base--;
            vx = channel->at(pnt).x() - vxavg;
            vy = channel->at(pnt).y() - vyavg;
            if(m_xComponent){
                x1 = cent + (-b*vx + a*vy)/c;
            }else {
                x1 = cent + (a*vx + b*vy)/c;
            }
            points.push_back(QPoint(x1, y1));
            if(++pnt >= channel->getRawNpt()) pnt = 0;
        }
    }
    return true;
}

bool ExpStripChartItem::xComponent() const
{
    return m_xComponent;
}

void ExpStripChartItem::setXComponent(bool xComponent)
{
    m_xComponent = xComponent;
}

int ExpStripChartItem::expTp() const
{
    return m_expTp;
}

void ExpStripChartItem::setExpTp(int expTp)
{
    if(m_expTp != expTp){
        m_expTp = expTp;
        Q_EMIT expTpChanged();
    }
}