void PieDiagram::calcPieSize( const QRectF &contentsRect )
{
d->size = qMin( contentsRect.width(), contentsRect.height() );
// if any slice explodes, the whole pie needs additional space so we make the basic size smaller
qreal maxExplode = 0.0;
const int colCount = columnCount();
for ( int j = 0; j < colCount; ++j ) {
const PieAttributes columnAttrs( pieAttributes( model()->index( 0, j, rootIndex() ) ) ); // checked
maxExplode = qMax( maxExplode, columnAttrs.explodeFactor() );
}
d->size /= ( 1.0 + 1.0 * maxExplode );
if ( d->size < 0.0 ) {
d->size = 0;
}
}
const QPair<QPointF, QPointF> PieDiagram::calculateDataBoundaries () const
{
if ( !checkInvariants( true ) || model()->rowCount() < 1 ) return QPair<QPointF, QPointF>( QPointF( 0, 0 ), QPointF( 0, 0 ) );
const PieAttributes attrs( pieAttributes() );
QPointF bottomLeft( QPointF( 0, 0 ) );
QPointF topRight;
// If we explode, we need extra space for the slice that has the largest explosion distance.
if ( attrs.explode() ) {
const int colCount = columnCount();
qreal maxExplode = 0.0;
for ( int j = 0; j < colCount; ++j ) {
const PieAttributes columnAttrs( pieAttributes( model()->index( 0, j, rootIndex() ) ) ); // checked
maxExplode = qMax( maxExplode, columnAttrs.explodeFactor() );
}
topRight = QPointF( 1.0 + maxExplode, 1.0 + maxExplode );
} else {
topRight = QPointF( 1.0, 1.0 );
}
return QPair<QPointF, QPointF> ( bottomLeft, topRight );
}
void PieDiagram::paintInternal(PaintContext* ctx, QRectF& textBoundingRect)
{
// note: Not having any data model assigned is no bug
// but we can not draw a diagram then either.
if ( !checkInvariants(true) )
return;
d->reverseMapper.clear();
const PieAttributes attrs( pieAttributes() );
const ThreeDPieAttributes threeDAttrs( threeDPieAttributes( model()->index( 0, 0, rootIndex() ) ) );
const int colCount = columnCount();
QRectF contentsRect( buildReferenceRect( polarCoordinatePlane() ) );
contentsRect = ctx->rectangle();
// contentsRect = geometry();
//qDebug() << contentsRect;
if( contentsRect.isEmpty() )
return;
DataValueTextInfoList list;
const qreal sum = valueTotals();
if( sum == 0.0 ) //nothing to draw
return;
d->startAngles.resize( colCount );
d->angleLens.resize( colCount );
// compute position
d->size = qMin( contentsRect.width(), contentsRect.height() ); // initial size
// if the pies explode, we need to give them additional space =>
// make the basic size smaller
qreal maxExplode = 0.0;
for( int j = 0; j < colCount; ++j ){
const PieAttributes columnAttrs( pieAttributes( model()->index( 0, j, rootIndex() ) ) );
maxExplode = qMax( maxExplode, columnAttrs.explodeFactor() );
}
d->size /= ( 1.0 + 1.0 * maxExplode );
if(d->size < 0.0)
d->size = 0;
if(!textBoundingRect.isEmpty() && d->size > 0.0)
{
// Find out the distances from every corner of the rectangle with
// the center.
QPointF center = ctx->rectangle().center();
qreal left = qMax(qreal(0.0), center.x() - textBoundingRect.left());
qreal right = qMax(qreal(0.0), textBoundingRect.right() - center.x());
qreal top = qMax(qreal(0.0), center.y() - textBoundingRect.top());
qreal bottom = qMax(qreal(0.0), textBoundingRect.bottom() - center.y());
// Compute the minimal and maximal distances for horizontal vs vertical
// the text has.
qreal xDistanceMax, xDistanceMin, yDistanceMax, yDistanceMin;
if ( left > right ) {
xDistanceMax = left;
xDistanceMin = right;
} else {
xDistanceMax = right;
xDistanceMin = left;
}
if ( top > bottom ) {
yDistanceMax = top;
yDistanceMin = bottom;
} else {
yDistanceMax = bottom;
yDistanceMin = top;
}
// Above we are dealing with the distance from the center what means
// below we need to make sure to use the half d->size while working
// with those values.
qreal availableDistance = d->size/2.0;
// Now first check what size (if any) the text needs more in any
// of the corners then what is available for the pie-chart.
// The resulting diff value is not any longer only related to the
// distance (d->size/2 cause of calculation from the center) but
// is now in relation to the whole d->size.
qreal diff;
if ( xDistanceMax + xDistanceMin > yDistanceMax + yDistanceMin ) {
diff = qMax(qreal(0.0), xDistanceMax - availableDistance) + qMax(qreal(0.0), xDistanceMin - availableDistance);
} else {
diff = qMax(qreal(0.0), yDistanceMax - availableDistance) + qMax(qreal(0.0), yDistanceMin - availableDistance);
}
if(diff > 0.0) {
// If that is the case then we need to shrink the size available for the
// pie-chart by the additional space needed for the text. Those space
// removed from the pie-chart will then be used by the text and makes
// sure that the text fits into the contentsRect and is not drawn outside.
d->size -= qMin(d->size, diff);
}
}
qreal sizeFor3DEffect = 0.0;
if ( ! threeDAttrs.isEnabled() ) {
qreal x = ( contentsRect.width() == d->size ) ? 0.0 : ( ( contentsRect.width() - d->size ) / 2.0 );
qreal y = ( contentsRect.height() == d->size ) ? 0.0 : ( ( contentsRect.height() - d->size ) / 2.0 );
d->position = QRectF( x, y, d->size, d->size );
d->position.translate( contentsRect.left(), contentsRect.top() );
} else {
// threeD: width is the maximum possible width; height is 1/2 of that
qreal x = ( contentsRect.width() == d->size ) ? 0.0 : ( ( contentsRect.width() - d->size ) / 2.0 );
qreal height = d->size;
// make sure that the height plus the threeDheight is not more than the
// available size
if ( threeDAttrs.depth() >= 0.0 ) {
// positive pie height: absolute value
sizeFor3DEffect = threeDAttrs.depth();
height = d->size - sizeFor3DEffect;
} else {
// negative pie height: relative value
sizeFor3DEffect = - threeDAttrs.depth() / 100.0 * height;
height = d->size - sizeFor3DEffect;
}
qreal y = ( contentsRect.height() == height ) ? 0.0 : ( ( contentsRect.height() - height - sizeFor3DEffect ) / 2.0 );
d->position = QRectF( contentsRect.left() + x, contentsRect.top() + y,
d->size, height );
// d->position.moveBy( contentsRect.left(), contentsRect.top() );
}
const PolarCoordinatePlane * plane = polarCoordinatePlane();
const qreal sectorsPerValue = 360.0 / sum;
qreal currentValue = plane ? plane->startPosition() : 0.0;
bool atLeastOneValue = false; // guard against completely empty tables
QVariant vValY;
for ( int iColumn = 0; iColumn < colCount; ++iColumn ) {
// is there anything at all at this column?
bool bOK;
const double cellValue = qAbs( model()->data( model()->index( 0, iColumn, rootIndex() ) )
.toDouble( &bOK ) );
if( bOK ){
d->startAngles[ iColumn ] = currentValue;
d->angleLens[ iColumn ] = cellValue * sectorsPerValue;
atLeastOneValue = true;
} else { // mark as non-existent
d->angleLens[ iColumn ] = 0.0;
if ( iColumn > 0.0 )
d->startAngles[ iColumn ] = d->startAngles[ iColumn - 1 ];
else
d->startAngles[ iColumn ] = currentValue;
}
//qDebug() << "d->startAngles["<<iColumn<<"] == " << d->startAngles[ iColumn ]
// << " + d->angleLens["<<iColumn<<"]" << d->angleLens[ iColumn ]
// << " = " << d->startAngles[ iColumn ]+d->angleLens[ iColumn ];
currentValue = d->startAngles[ iColumn ] + d->angleLens[ iColumn ];
}
// If there was no value at all, bail out, to avoid endless loops
// later on (e.g. in findPieAt()).
if( ! atLeastOneValue )
return;
// Find the backmost pie which is at +90° and needs to be drawn
// first
int backmostpie = findPieAt( 90, colCount );
// Find the frontmost pie (at -90°/+270°) that should be drawn last
int frontmostpie = findPieAt( 270, colCount );
// the right- and the leftmost (only needed in some special cases...)
int rightmostpie = findPieAt( 0, colCount );
int leftmostpie = findPieAt( 180, colCount );
int currentLeftPie = backmostpie;
int currentRightPie = backmostpie;
d->clearListOfAlreadyDrawnDataValueTexts();
drawOnePie( ctx->painter(), &list, 0, backmostpie, granularity(), sizeFor3DEffect );
if( backmostpie == frontmostpie )
{
if( backmostpie == leftmostpie )
currentLeftPie = findLeftPie( currentLeftPie, colCount );
if( backmostpie == rightmostpie )
currentRightPie = findRightPie( currentRightPie, colCount );
}
while( currentLeftPie != frontmostpie )
{
if( currentLeftPie != backmostpie )
drawOnePie( ctx->painter(), &list, 0, currentLeftPie, granularity(), sizeFor3DEffect );
currentLeftPie = findLeftPie( currentLeftPie, colCount );
}
while( currentRightPie != frontmostpie )
{
if( currentRightPie != backmostpie )
drawOnePie( ctx->painter(), &list, 0, currentRightPie, granularity(), sizeFor3DEffect );
currentRightPie = findRightPie( currentRightPie, colCount );
}
// if the backmost pie is not the frontmost pie, we draw the frontmost at last
if( backmostpie != frontmostpie || ! threeDPieAttributes().isEnabled() )
{
drawOnePie( ctx->painter(), &list, 0, frontmostpie, granularity(), sizeFor3DEffect );
// otherwise, this gets a bit more complicated...
/* } else if( threeDPieAttributes().isEnabled() ) {
//drawPieSurface( ctx->painter(), 0, frontmostpie, granularity() );
const QModelIndex index = model()->index( 0, frontmostpie, rootIndex() );
QPen pen = this->pen( index );
ctx->painter()->setBrush( brush( index ) );
if ( threeDAttrs.isEnabled() )
pen.setColor( QColor( 0, 0, 0 ) );
ctx->painter()->setPen( pen );
qreal startAngle = d->startAngles[ frontmostpie ];
if( startAngle > 360 )
startAngle -= 360;
qreal endAngle = startAngle + d->angleLens[ frontmostpie ];
startAngle = qMax( startAngle, 180.0 );
drawArcEffectSegment( ctx->painter(), piePosition( 0, frontmostpie),
sizeFor3DEffect, startAngle, endAngle, granularity() );*/
}
d->paintDataValueTextsAndMarkers( this, ctx, list, false, false, &textBoundingRect );
}