void QgsPointDisplacementRenderer::calculateSymbolAndLabelPositions( const QPointF& centerPoint, int nPosition, double radius,
double symbolDiagonal, QList<QPointF>& symbolPositions, QList<QPointF>& labelShifts ) const
{
symbolPositions.clear();
labelShifts.clear();
if ( nPosition < 1 )
{
return;
}
else if ( nPosition == 1 ) //If there is only one feature, draw it exactly at the center position
{
symbolPositions.append( centerPoint );
labelShifts.append( QPointF( symbolDiagonal / 2.0, -symbolDiagonal / 2.0 ) );
return;
}
double fullPerimeter = 2 * M_PI;
double angleStep = fullPerimeter / nPosition;
double currentAngle;
for ( currentAngle = 0.0; currentAngle < fullPerimeter; currentAngle += angleStep )
{
double sinusCurrentAngle = sin( currentAngle );
double cosinusCurrentAngle = cos( currentAngle );
QPointF positionShift( radius * sinusCurrentAngle, radius * cosinusCurrentAngle );
QPointF labelShift(( radius + symbolDiagonal / 2 ) * sinusCurrentAngle, ( radius + symbolDiagonal / 2 ) * cosinusCurrentAngle );
symbolPositions.append( centerPoint + positionShift );
labelShifts.append( labelShift );
}
}
void QgsPointDisplacementRenderer::calculateSymbolAndLabelPositions( const QPointF& centerPoint, int nPosition, double radius, \
double symbolDiagonal, QList<QPointF>& symbolPositions, QList<QPointF>& labelShifts ) const
{
symbolPositions.clear();
labelShifts.clear();
double fullPerimeter = 2 * M_PI;
double angleStep = fullPerimeter / nPosition;
double currentAngle;
for ( currentAngle = 0.0; currentAngle < fullPerimeter; currentAngle += angleStep )
{
double sinusCurrentAngle = sin( currentAngle );
double cosinusCurrentAngle = cos( currentAngle );
QPointF positionShift( radius * sinusCurrentAngle, radius * cosinusCurrentAngle );
QPointF labelShift(( radius + symbolDiagonal / 2 ) * sinusCurrentAngle, ( radius + symbolDiagonal / 2 ) * cosinusCurrentAngle );
symbolPositions.append( centerPoint + positionShift );
labelShifts.append( labelShift );
}
}
void QgsPointDisplacementRenderer::calculateSymbolAndLabelPositions( QgsSymbolV2RenderContext& symbolContext, const QPointF& centerPoint, int nPosition,
double symbolDiagonal, QList<QPointF>& symbolPositions, QList<QPointF>& labelShifts, double& circleRadius ) const
{
symbolPositions.clear();
labelShifts.clear();
if ( nPosition < 1 )
{
return;
}
else if ( nPosition == 1 ) //If there is only one feature, draw it exactly at the center position
{
symbolPositions.append( centerPoint );
labelShifts.append( QPointF( symbolDiagonal / 2.0, -symbolDiagonal / 2.0 ) );
return;
}
double circleAdditionPainterUnits = symbolContext.outputLineWidth( mCircleRadiusAddition );
switch ( mPlacement )
{
case Ring:
{
double minDiameterToFitSymbols = nPosition * symbolDiagonal / ( 2.0 * M_PI );
double radius = qMax( symbolDiagonal / 2, minDiameterToFitSymbols ) + circleAdditionPainterUnits;
double fullPerimeter = 2 * M_PI;
double angleStep = fullPerimeter / nPosition;
for ( double currentAngle = 0.0; currentAngle < fullPerimeter; currentAngle += angleStep )
{
double sinusCurrentAngle = sin( currentAngle );
double cosinusCurrentAngle = cos( currentAngle );
QPointF positionShift( radius * sinusCurrentAngle, radius * cosinusCurrentAngle );
QPointF labelShift(( radius + symbolDiagonal / 2 ) * sinusCurrentAngle, ( radius + symbolDiagonal / 2 ) * cosinusCurrentAngle );
symbolPositions.append( centerPoint + positionShift );
labelShifts.append( labelShift );
}
circleRadius = radius;
break;
}
case ConcentricRings:
{
double centerDiagonal = QgsSymbolLayerV2Utils::convertToPainterUnits( symbolContext.renderContext(),
M_SQRT2 * mCenterSymbol->size(),
mCenterSymbol->outputUnit(), mCenterSymbol->mapUnitScale() );
int pointsRemaining = nPosition;
int ringNumber = 1;
double firstRingRadius = centerDiagonal / 2.0 + symbolDiagonal / 2.0;
while ( pointsRemaining > 0 )
{
double radiusCurrentRing = qMax( firstRingRadius + ( ringNumber - 1 ) * symbolDiagonal + ringNumber * circleAdditionPainterUnits, 0.0 );
int maxPointsCurrentRing = qMax( floor( 2 * M_PI * radiusCurrentRing / symbolDiagonal ), 1.0 );
int actualPointsCurrentRing = qMin( maxPointsCurrentRing, pointsRemaining );
double angleStep = 2 * M_PI / actualPointsCurrentRing;
double currentAngle = 0.0;
for ( int i = 0; i < actualPointsCurrentRing; ++i )
{
double sinusCurrentAngle = sin( currentAngle );
double cosinusCurrentAngle = cos( currentAngle );
QPointF positionShift( radiusCurrentRing * sinusCurrentAngle, radiusCurrentRing * cosinusCurrentAngle );
QPointF labelShift(( radiusCurrentRing + symbolDiagonal / 2 ) * sinusCurrentAngle, ( radiusCurrentRing + symbolDiagonal / 2 ) * cosinusCurrentAngle );
symbolPositions.append( centerPoint + positionShift );
labelShifts.append( labelShift );
currentAngle += angleStep;
}
pointsRemaining -= actualPointsCurrentRing;
ringNumber++;
circleRadius = radiusCurrentRing;
}
break;
}
}
}
void QgsPointDisplacementRenderer::calculateSymbolAndLabelPositions( QgsSymbolRenderContext &symbolContext, QPointF centerPoint, int nPosition,
double symbolDiagonal, QList<QPointF> &symbolPositions, QList<QPointF> &labelShifts, double &circleRadius, double &gridRadius,
int &gridSize ) const
{
symbolPositions.clear();
labelShifts.clear();
if ( nPosition < 1 )
{
return;
}
else if ( nPosition == 1 ) //If there is only one feature, draw it exactly at the center position
{
symbolPositions.append( centerPoint );
labelShifts.append( QPointF( symbolDiagonal / 2.0, -symbolDiagonal / 2.0 ) );
return;
}
double circleAdditionPainterUnits = symbolContext.outputLineWidth( mCircleRadiusAddition );
switch ( mPlacement )
{
case Ring:
{
double minDiameterToFitSymbols = nPosition * symbolDiagonal / ( 2.0 * M_PI );
double radius = std::max( symbolDiagonal / 2, minDiameterToFitSymbols ) + circleAdditionPainterUnits;
double fullPerimeter = 2 * M_PI;
double angleStep = fullPerimeter / nPosition;
for ( double currentAngle = 0.0; currentAngle < fullPerimeter; currentAngle += angleStep )
{
double sinusCurrentAngle = std::sin( currentAngle );
double cosinusCurrentAngle = std::cos( currentAngle );
QPointF positionShift( radius * sinusCurrentAngle, radius * cosinusCurrentAngle );
QPointF labelShift( ( radius + symbolDiagonal / 2 ) * sinusCurrentAngle, ( radius + symbolDiagonal / 2 ) * cosinusCurrentAngle );
symbolPositions.append( centerPoint + positionShift );
labelShifts.append( labelShift );
}
circleRadius = radius;
break;
}
case ConcentricRings:
{
double centerDiagonal = mCenterSymbol->size( symbolContext.renderContext() ) * M_SQRT2;
int pointsRemaining = nPosition;
int ringNumber = 1;
double firstRingRadius = centerDiagonal / 2.0 + symbolDiagonal / 2.0;
while ( pointsRemaining > 0 )
{
double radiusCurrentRing = std::max( firstRingRadius + ( ringNumber - 1 ) * symbolDiagonal + ringNumber * circleAdditionPainterUnits, 0.0 );
int maxPointsCurrentRing = std::max( std::floor( 2 * M_PI * radiusCurrentRing / symbolDiagonal ), 1.0 );
int actualPointsCurrentRing = std::min( maxPointsCurrentRing, pointsRemaining );
double angleStep = 2 * M_PI / actualPointsCurrentRing;
double currentAngle = 0.0;
for ( int i = 0; i < actualPointsCurrentRing; ++i )
{
double sinusCurrentAngle = std::sin( currentAngle );
double cosinusCurrentAngle = std::cos( currentAngle );
QPointF positionShift( radiusCurrentRing * sinusCurrentAngle, radiusCurrentRing * cosinusCurrentAngle );
QPointF labelShift( ( radiusCurrentRing + symbolDiagonal / 2 ) * sinusCurrentAngle, ( radiusCurrentRing + symbolDiagonal / 2 ) * cosinusCurrentAngle );
symbolPositions.append( centerPoint + positionShift );
labelShifts.append( labelShift );
currentAngle += angleStep;
}
pointsRemaining -= actualPointsCurrentRing;
ringNumber++;
circleRadius = radiusCurrentRing;
}
break;
}
case Grid:
{
double centerDiagonal = mCenterSymbol->size( symbolContext.renderContext() ) * M_SQRT2;
int pointsRemaining = nPosition;
gridSize = std::ceil( std::sqrt( pointsRemaining ) );
if ( pointsRemaining - std::pow( gridSize - 1, 2 ) < gridSize )
gridSize -= 1;
double originalPointRadius = ( ( centerDiagonal / 2.0 + symbolDiagonal / 2.0 ) + symbolDiagonal ) / 2;
double userPointRadius = originalPointRadius + circleAdditionPainterUnits;
int yIndex = 0;
while ( pointsRemaining > 0 )
{
for ( int xIndex = 0; xIndex < gridSize && pointsRemaining > 0; ++xIndex )
{
QPointF positionShift( userPointRadius * xIndex, userPointRadius * yIndex );
QPointF labelShift( ( userPointRadius + symbolDiagonal / 2 ) * xIndex, ( userPointRadius + symbolDiagonal / 2 ) * yIndex );
symbolPositions.append( centerPoint + positionShift );
labelShifts.append( labelShift );
pointsRemaining--;
}
yIndex++;
}
centralizeGrid( symbolPositions, userPointRadius, gridSize );
centralizeGrid( labelShifts, userPointRadius, gridSize );
gridRadius = userPointRadius;
break;
}
}
}