void RingChart::drawRing(QPainter &p, const QPoint ¢er, int ring, int radius1, int radius2, bool checkHighlight, double mouseAngle)
{
int row_count = m_model->rowCount();
// calculate segments
double totalValue = 0;
for (int r = 0; r < row_count; r++)
{
const QModelIndex index(m_model->index(r, ring));
double value = m_model->data(index).toDouble();
if (value > 0.0)
totalValue += value;
}
// draw segments
double startAngle = 0.0;
bool isHighlighted = false;
double angleHl1, angleHl2, valueHl;
QModelIndex indexHl;
// outer rect
QRect pieRect(center.x() - radius2, center.y() - radius2, radius2 * 2, radius2 * 2);
for (int r = 0; r < row_count; r++)
{
const QModelIndex index(m_model->index(r, ring));
double value = m_model->data(index).toDouble();
if (value > 0.0) {
double angle = 360 * value / totalValue;
if (checkHighlight && startAngle <= mouseAngle && mouseAngle <= (startAngle + angle))
{
isHighlighted = true;
angleHl1 = startAngle;
angleHl2 = angle;
valueHl = value;
indexHl = index;
}
else
{
drawSegment(p, pieRect, index, value, startAngle, angle, false);
drawValue(p, pieRect, index, value, startAngle, angle, false);
}
startAngle += angle;
}
}
// highlight to be drawn over the other segments
if (isHighlighted)
{
setIndexUnderMouse(indexHl);
drawSegment(p, pieRect, indexHl, valueHl, angleHl1, angleHl2, true);
drawValue(p, pieRect, indexHl, valueHl, angleHl1, angleHl2, true);
}
else
setIndexUnderMouse(QModelIndex());
}
void QgsPaperItem::paint( QPainter* painter, const QStyleOptionGraphicsItem* itemStyle, QWidget* pWidget )
{
Q_UNUSED( itemStyle );
Q_UNUSED( pWidget );
if ( !painter )
{
return;
}
drawBackground( painter );
//draw grid
if ( mComposition )
{
if ( mComposition->snapToGridEnabled() && mComposition->plotStyle() == QgsComposition::Preview
&& mComposition->snapGridResolution() > 0 )
{
int gridMultiplyX = ( int )( mComposition->snapGridOffsetX() / mComposition->snapGridResolution() );
int gridMultiplyY = ( int )( mComposition->snapGridOffsetY() / mComposition->snapGridResolution() );
double currentXCoord = mComposition->snapGridOffsetX() - gridMultiplyX * mComposition->snapGridResolution();
double currentYCoord;
double minYCoord = mComposition->snapGridOffsetY() - gridMultiplyY * mComposition->snapGridResolution();
if ( mComposition->gridStyle() == QgsComposition::Solid )
{
painter->setPen( mComposition->gridPen() );
//draw vertical lines
for ( ; currentXCoord <= rect().width(); currentXCoord += mComposition->snapGridResolution() )
{
painter->drawLine( QPointF( currentXCoord, 0 ), QPointF( currentXCoord, rect().height() ) );
}
//draw horizontal lines
currentYCoord = minYCoord;
for ( ; currentYCoord <= rect().height(); currentYCoord += mComposition->snapGridResolution() )
{
painter->drawLine( QPointF( 0, currentYCoord ), QPointF( rect().width(), currentYCoord ) );
}
}
else //'Dots' or 'Crosses'
{
QPen gridPen = mComposition->gridPen();
painter->setPen( gridPen );
painter->setBrush( QBrush( gridPen.color() ) );
double halfCrossLength = mComposition->snapGridResolution() / 6;
for ( ; currentXCoord <= rect().width(); currentXCoord += mComposition->snapGridResolution() )
{
currentYCoord = minYCoord;
for ( ; currentYCoord <= rect().height(); currentYCoord += mComposition->snapGridResolution() )
{
if ( mComposition->gridStyle() == QgsComposition::Dots )
{
QRectF pieRect( currentXCoord - gridPen.widthF() / 2, currentYCoord - gridPen.widthF() / 2, gridPen.widthF(), gridPen.widthF() );
painter->drawChord( pieRect, 0, 5760 );
}
else if ( mComposition->gridStyle() == QgsComposition::Crosses )
{
painter->drawLine( QPointF( currentXCoord - halfCrossLength, currentYCoord ), QPointF( currentXCoord + halfCrossLength, currentYCoord ) );
painter->drawLine( QPointF( currentXCoord, currentYCoord - halfCrossLength ), QPointF( currentXCoord, currentYCoord + halfCrossLength ) );
}
}
}
}
}
}
}