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Consolidate all render context unit conversion to single methods
within QgsRenderContext Fix invalid conversions, update unit tests
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/*************************************************************************** | ||
qgsmapunitscale.cpp | ||
------------------- | ||
begin : April 2014 | ||
copyright : (C) Sandro Mani | ||
email : smani at sourcepole dot ch | ||
*************************************************************************** | ||
* * | ||
* This program is free software; you can redistribute it and/or modify * | ||
* it under the terms of the GNU General Public License as published by * | ||
* the Free Software Foundation; either version 2 of the License, or * | ||
* (at your option) any later version. * | ||
* * | ||
***************************************************************************/ | ||
|
||
#include "qgsmapunitscale.h" | ||
#include "qgsrendercontext.h" | ||
|
||
double QgsMapUnitScale::computeMapUnitsPerPixel( const QgsRenderContext& c ) const | ||
{ | ||
double mup = c.mapToPixel().mapUnitsPerPixel(); | ||
double renderScale = c.rendererScale(); // Note: this value is 1 / scale | ||
if ( !qgsDoubleNear( minScale, 0 ) ) | ||
{ | ||
mup = qMin( mup / ( minScale * renderScale ), mup ); | ||
} | ||
if ( !qgsDoubleNear( maxScale, 0 ) ) | ||
{ | ||
mup = qMax( mup / ( maxScale * renderScale ), mup ); | ||
} | ||
return mup; | ||
} |
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