本文整理汇总了C++中QPicture::logicalDpiY方法的典型用法代码示例。如果您正苦于以下问题：C++ QPicture::logicalDpiY方法的具体用法？C++ QPicture::logicalDpiY怎么用？C++ QPicture::logicalDpiY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QPicture的用法示例。
在下文中一共展示了QPicture::logicalDpiY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: cachePicture
void QgsSvgCache::cachePicture( QgsSvgCacheEntry *entry, bool forceVectorOutput )
{
if ( !entry )
{
return;
}
delete entry->picture;
entry->picture = 0;
//correct QPictures dpi correction
QPicture* picture = new QPicture();
QRectF rect;
QSvgRenderer r( entry->svgContent );
double hwRatio = 1.0;
if ( r.viewBoxF().width() > 0 )
{
hwRatio = r.viewBoxF().height() / r.viewBoxF().width();
}
bool drawOnScreen = qgsDoubleNear( entry->rasterScaleFactor, 1.0, 0.1 );
if ( drawOnScreen && forceVectorOutput ) //forceVectorOutput always true in case of composer draw / composer preview
{
// fix to ensure rotated symbols scale with composer page (i.e. not map item) zoom
double wSize = entry->size;
double hSize = wSize * hwRatio;
QSizeF s( r.viewBoxF().size() );
s.scale( wSize, hSize, Qt::KeepAspectRatio );
rect = QRectF( -s.width() / 2.0, -s.height() / 2.0, s.width(), s.height() );
}
else
{
// output for print or image saving @ specific dpi
double scaledSize = entry->size / 25.4 / ( entry->rasterScaleFactor * entry->widthScaleFactor );
double wSize = scaledSize * picture->logicalDpiX();
double hSize = scaledSize * picture->logicalDpiY() * r.viewBoxF().height() / r.viewBoxF().width();
rect = QRectF( QPointF( -wSize / 2.0, -hSize / 2.0 ), QSizeF( wSize, hSize ) );
}
QPainter p( picture );
r.render( &p, rect );
entry->picture = picture;
mTotalSize += entry->picture->size();
}