本文整理汇总了C++中QgsSymbolRenderContext::renderHints方法的典型用法代码示例。如果您正苦于以下问题：C++ QgsSymbolRenderContext::renderHints方法的具体用法？C++ QgsSymbolRenderContext::renderHints怎么用？C++ QgsSymbolRenderContext::renderHints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::renderHints方法的1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: calculateOffsetAndRotation
void QgsEllipseSymbolLayer::calculateOffsetAndRotation( QgsSymbolRenderContext &context,
double scaledWidth,
double scaledHeight,
bool &hasDataDefinedRotation,
QPointF &offset,
double &angle ) const
{
double offsetX = 0;
double offsetY = 0;
markerOffset( context, scaledWidth, scaledHeight, mSymbolWidthUnit, mSymbolHeightUnit, offsetX, offsetY, mSymbolWidthMapUnitScale, mSymbolHeightMapUnitScale );
offset = QPointF( offsetX, offsetY );
//priority for rotation: 1. data defined symbol level, 2. symbol layer rotation (mAngle)
bool ok = true;
angle = mAngle + mLineAngle;
bool usingDataDefinedRotation = false;
if ( mDataDefinedProperties.isActive( QgsSymbolLayer::PropertyAngle ) )
{
context.setOriginalValueVariable( angle );
angle = mDataDefinedProperties.valueAsDouble( QgsSymbolLayer::PropertyAngle, context.renderContext().expressionContext(), 0 ) + mLineAngle;
usingDataDefinedRotation = ok;
}
hasDataDefinedRotation = context.renderHints() & QgsSymbol::DynamicRotation || usingDataDefinedRotation;
if ( hasDataDefinedRotation )
{
// For non-point markers, "dataDefinedRotation" means following the
// shape (shape-data defined). For them, "field-data defined" does
// not work at all. TODO: if "field-data defined" ever gets implemented
// we'll need a way to distinguish here between the two, possibly
// using another flag in renderHints()
const QgsFeature *f = context.feature();
if ( f )
{
const QgsGeometry g = f->geometry();
if ( !g.isNull() && g.type() == QgsWkbTypes::PointGeometry )
{
const QgsMapToPixel &m2p = context.renderContext().mapToPixel();
angle += m2p.mapRotation();
}
}
}
if ( angle )
offset = _rotatedOffset( offset, angle );
}