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statistics: make confidence area and regression line opt-in

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This is not perfect - the polygon of the confidence area is
calculated even if it is not shown. Oh well.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2021-01-19 11:18:10 +01:00 • committed by bstoeger
parent ff536e98fc
commit ba259fb1d6
5 changed files with 57 additions and 21 deletions
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31
stats/regressionitem.cpp
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@ -11,7 +11,8 @@ static const double regressionLineWidth = 2.0;
RegressionItem::RegressionItem(StatsView &view, regression_data reg,
StatsAxis *xAxis, StatsAxis *yAxis) :
ChartPixmapItem(view, ChartZValue::ChartFeatures),
xAxis(xAxis), yAxis(yAxis), reg(reg)
xAxis(xAxis), yAxis(yAxis), reg(reg),
regression(true), confidence(true)
{
}
@ -19,6 +20,16 @@ RegressionItem::~RegressionItem()
{
}
void RegressionItem::setFeatures(bool regressionIn, bool confidenceIn)
{
if (regressionIn == regression && confidenceIn == confidence)
return;
regression = regressionIn;
confidence = confidenceIn;
updatePosition();
}
// Note: this calculates the confidence area, even if it isn't shown. Might want to optimize this.
void RegressionItem::updatePosition()
{
if (!xAxis || !yAxis)
@ -74,14 +85,18 @@ void RegressionItem::updatePosition()
ChartPixmapItem::resize(QSizeF(screenMaxX - screenMinX, screenMaxY - screenMinY));
img->fill(Qt::transparent);
QColor col(regressionItemColor);
col.setAlphaF(reg.r2);
painter->setPen(Qt::NoPen);
painter->setBrush(QBrush(col));
painter->drawPolygon(poly);
if (confidence) {
QColor col(regressionItemColor);
col.setAlphaF(reg.r2);
painter->setPen(Qt::NoPen);
painter->setBrush(QBrush(col));
painter->drawPolygon(poly);
}
painter->setPen(QPen(regressionItemColor, regressionLineWidth));
painter->drawLine(QPointF(linePolygon[0]), QPointF(linePolygon[1]));
if (regression) {
painter->setPen(QPen(regressionItemColor, regressionLineWidth));
painter->drawLine(QPointF(linePolygon[0]), QPointF(linePolygon[1]));
}
ChartPixmapItem::setPos(offset);
}