[QGIS Commit] r11744 - docs/trunk/english_us/user_guide

[svn_qgis at osgeo.org]

Author: micha
Date: 2009-10-03 14:53:25 -0400 (Sat, 03 Oct 2009)
New Revision: 11744

Modified:
   docs/trunk/english_us/user_guide/features_at_a_glance.tex
   docs/trunk/english_us/user_guide/working_with_vector.tex
Log:
Added snapping to selected layer in measuring tools

Modified: docs/trunk/english_us/user_guide/features_at_a_glance.tex
===================================================================
--- docs/trunk/english_us/user_guide/features_at_a_glance.tex	2009-10-02 21:18:25 UTC (rev 11743)
+++ docs/trunk/english_us/user_guide/features_at_a_glance.tex	2009-10-03 18:53:25 UTC (rev 11744)
@@ -722,7 +722,7 @@
 the loaded map is defined with a geographic coordinate system
 (latitude/longitude), the results from line or area measurements will be 
 incorrect. To fix this you need to set an appropriate map coordinate system 
-(See Section~\ref{label_projections}).
+(See Section~\ref{label_projections}). 
 
 \subsubsection{Measure length and areas}\index{measure:line length}\index{measure:areas}
 \includegraphics[width=0.7cm]{mActionMeasure} 
@@ -734,6 +734,7 @@
 length is printed. To stop measuring click your right mouse button. \\
 \includegraphics[width=0.7cm]{mActionMeasureArea} Areas can also be measured. 
 The window shows the accumulated area-size in the measure window 
+In addition, the measuring tool will snap to the currently selected layer, provided that layer has its snapping tolerance set. (See Section~\ref{snapping_tolerance}). So if you want to measure exactly along a line feature, or around a polygon feature, first set its snapping tolerance, then select the layer. Now, when using the measuring tools, each mouse click (within the tolerance setting) will snap to that layer. 
 
 \begin{figure}[h]
 \caption{Measure tools in action \nixcaption} \label{fig:measure}

Modified: docs/trunk/english_us/user_guide/working_with_vector.tex
===================================================================
--- docs/trunk/english_us/user_guide/working_with_vector.tex	2009-10-02 21:18:25 UTC (rev 11743)
+++ docs/trunk/english_us/user_guide/working_with_vector.tex	2009-10-03 18:53:25 UTC (rev 11744)
@@ -971,9 +971,9 @@
 }
 \end{Tip}
 
-\subsubsection{Setting the Snapping Tolerance and Search Radius}
+\subsubsection{Setting the Snapping Tolerance and Search Radius}\label{snapping_tolerance}
 
-Before we can edit vertices, it is very important to set the snapping
+Before we can edit vertices, we must set the snapping
 tolerance and search radius to a value that allows us an optimal editing of
 the vector layer geometries. 
 
@@ -1001,7 +1001,7 @@
 Properties\dots}. In the \tab{General} tab, section \classname{Digitize} you
 can click on \button{Snapping options\dots} to enable and adjust snapping
 mode and tolerance on a layer basis (see Figure~\ref{fig:snappingoptions}).
-\end{enumerate}
+\end{enumerate}.  Note that this layer based snapping overrides the global snapping option set in the Digitizing tab. So if you need to edit one layer, and snap its vertices to another layer, then enable snapping only on the \usertext{snap to} layer, then decrease the global snapping tolerance to a smaller value.  Furthermore, snapping will never occur to a layer which is not checked in the snapping options dialog, regardless of the global snapping tolerance. So be sure to mark the checkbox for those layers that you need to snap to.
 
 \begin{figure}[H]
    \begin{center}