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C++ QgsSymbolRenderContext::outputLineWidth方法代码示例

本文整理汇总了C++中QgsSymbolRenderContext::outputLineWidth方法的典型用法代码示例。如果您正苦于以下问题：C++ QgsSymbolRenderContext::outputLineWidth方法的具体用法？C++ QgsSymbolRenderContext::outputLineWidth怎么用？C++ QgsSymbolRenderContext::outputLineWidth使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类QgsSymbolRenderContext的用法示例。


在下文中一共展示了QgsSymbolRenderContext::outputLineWidth方法的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: drawGrid

void QgsPointDisplacementRenderer::drawGrid( int gridSizeUnits, QgsSymbolRenderContext &context,
    QList<QPointF> pointSymbolPositions, int nSymbols )
{
  QPainter *p = context.renderContext().painter();
  if ( nSymbols < 2 || !p ) //draw grid only if multiple features
  {
    return;
  }

  QPen gridPen( mCircleColor );
  gridPen.setWidthF( context.outputLineWidth( mCircleWidth ) );
  p->setPen( gridPen );

  for ( int i = 0; i < pointSymbolPositions.size(); ++i )
  {
    if ( i + 1 < pointSymbolPositions.size() && 0 != ( i + 1 ) % gridSizeUnits )
    {
      QLineF gridLineRow( pointSymbolPositions[i], pointSymbolPositions[i + 1] );
      p->drawLine( gridLineRow );
    }

    if ( i + gridSizeUnits < pointSymbolPositions.size() )
    {
      QLineF gridLineColumn( pointSymbolPositions[i], pointSymbolPositions[i + gridSizeUnits] );
      p->drawLine( gridLineColumn );
    }
  }
}
开发者ID:mbernasocchi，项目名称:QGIS，代码行数:28，代码来源:qgspointdisplacementrenderer.cpp

示例2: drawCircle

void QgsPointDisplacementRenderer::drawCircle( double radiusPainterUnits, QgsSymbolRenderContext &context, QPointF centerPoint, int nSymbols )
{
  QPainter *p = context.renderContext().painter();
  if ( nSymbols < 2 || !p ) //draw circle only if multiple features
  {
    return;
  }

  //draw Circle
  QPen circlePen( mCircleColor );
  circlePen.setWidthF( context.outputLineWidth( mCircleWidth ) );
  p->setPen( circlePen );
  p->drawArc( QRectF( centerPoint.x() - radiusPainterUnits, centerPoint.y() - radiusPainterUnits, 2 * radiusPainterUnits, 2 * radiusPainterUnits ), 0, 5760 );
}
开发者ID:mbernasocchi，项目名称:QGIS，代码行数:14，代码来源:qgspointdisplacementrenderer.cpp

示例3: calculateSymbolAndLabelPositions

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 );
//.........这里部分代码省略.........
开发者ID:mbernasocchi，项目名称:QGIS，代码行数:101，代码来源:qgspointdisplacementrenderer.cpp

示例4: calculateSymbolAndLabelPositions

void QgsPointDisplacementRenderer::calculateSymbolAndLabelPositions( QgsSymbolRenderContext& symbolContext, 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 = symbolContext.renderContext().convertToPainterUnits( M_SQRT2 * mCenterSymbol->size(),
                              mCenterSymbol->sizeUnit(), mCenterSymbol->sizeMapUnitScale() );

      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;
    }
  }
}
开发者ID:wongjimsan，项目名称:QGIS，代码行数:76，代码来源:qgspointdisplacementrenderer.cpp


注：本文中的QgsSymbolRenderContext::outputLineWidth方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。