Snap to grid to sub unit resolution

m-kuhn · m-kuhn · commit aa9588163328 · 2018-09-13T10:54:15.000+02:00
When the grid was smaller than 1 map unit, qgis would just freeze. ouch
diff --git a/src/gui/qgssnaptogridcanvasitem.cpp b/src/gui/qgssnaptogridcanvasitem.cpp
@@ -53,9 +53,9 @@ void QgsSnapToGridCanvasItem::paint( QPainter *painter )
     const double gridYMin = std::ceil( layerExtent.yMinimum() / mPrecision ) * mPrecision;
     const double gridYMax = std::ceil( layerExtent.yMaximum() / mPrecision ) * mPrecision;
 
-    for ( int x = gridXMin ; x < gridXMax; x += mPrecision )
+    for ( double x = gridXMin ; x < gridXMax; x += mPrecision )
     {
-      for ( int y = gridYMin ; y < gridYMax; y += mPrecision )
+      for ( double y = gridYMin ; y < gridYMax; y += mPrecision )
       {
         const QgsPointXY pt = mTransform.transform( x, y );
         const QPointF canvasPt = toCanvasCoordinates( pt );

Original file line number	Diff line number	Diff line change
`@@ -53,9 +53,9 @@ void QgsSnapToGridCanvasItem::paint( QPainter *painter )`
`53`	`53`	`const double gridYMin = std::ceil( layerExtent.yMinimum() / mPrecision ) * mPrecision;`
`54`	`54`	`const double gridYMax = std::ceil( layerExtent.yMaximum() / mPrecision ) * mPrecision;`
`55`	`55`
`56`		`- for ( int x = gridXMin ; x < gridXMax; x += mPrecision )`
	`56`	`+ for ( double x = gridXMin ; x < gridXMax; x += mPrecision )`
`57`	`57`	`{`
`58`		`- for ( int y = gridYMin ; y < gridYMax; y += mPrecision )`
	`58`	`+ for ( double y = gridYMin ; y < gridYMax; y += mPrecision )`
`59`	`59`	`{`
`60`	`60`	`const QgsPointXY pt = mTransform.transform( x, y );`
`61`	`61`	`const QPointF canvasPt = toCanvasCoordinates( pt );`