decimator.html

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<A NAME="Decimator(org.opengis.referencing.operation.MathTransform, java.awt.Rectangle)"><!-- --></A><H3>
Decimator</H3>
<PRE>
public <B>Decimator</B>(MathTransform&nbsp;screenToWorld,
                 <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/Rectangle.html" title="class or interface in java.awt">Rectangle</A>&nbsp;paintArea)</PRE>
<DL>
<DD>djb - noticed that the old way of finding out the decimation is based on
 the (0,0) location of the image. This is often wildly unrepresentitive of
 the scale of the entire map.
 
 A better thing to do is to decimate this on a per-shape basis (and use
 the shape's center). Another option would be to sample the image at
 different locations (say 9) and choose the smallest spanx/spany you find.
 
 Also, if the xform is an affine Xform, you can be a bit more aggressive
 in the decimation. If its not an affine xform (ie. its actually doing a
 CRS xform), you may find this is a bit too aggressive due to any number
 of mathematical issues.
 
 This is just a simple method that uses the centre of the given rectangle
 instead of (0,0).
 
 NOTE: this could need more work based on CRS, but the rectangle is in
 pixels so it should be fairly immune to all but crazy projections.
<P>
<DT><B>Parameters:</B><DD><CODE>screenToWorld</CODE> - <DD><CODE>paintArea</CODE> - </DL>
<HR>

<A NAME="Decimator(org.opengis.referencing.operation.MathTransform)"><!-- --></A><H3>
Decimator</H3>
<PRE>
public <B>Decimator</B>(MathTransform&nbsp;screenToWorld)</PRE>
<DL>
<DD><B>Deprecated.</B>&nbsp;<I>use the other constructor (with rectange) see javadox. This
             works fine, but it the results are often poor if you're also
             doing CRS xforms.</I>
<P>

<DT><B>Throws:</B>
<DD><CODE>TransformException</CODE></DL>

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<A NAME="decimateTransformGeneralize(com.vividsolutions.jts.geom.Geometry, org.opengis.referencing.operation.MathTransform)"><!-- --></A><H3>
decimateTransformGeneralize</H3>
<PRE>
public final void <B>decimateTransformGeneralize</B>(<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Geometry.html" title="class or interface in com.vividsolutions.jts.geom">Geometry</A>&nbsp;geometry,
                                              MathTransform&nbsp;transform)
                                       throws TransformException</PRE>
<DL>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>TransformException</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="decimate(com.vividsolutions.jts.geom.Geometry)"><!-- --></A><H3>
decimate</H3>
<PRE>
public final void <B>decimate</B>(<A HREF="http://www.jump-project.org/docs/jts/1.7/api/com/vividsolutions/jts/geom/Geometry.html" title="class or interface in com.vividsolutions.jts.geom">Geometry</A>&nbsp;geom)</PRE>
<DL>
<DD>decimates JTS geometries.
<P>
<DD><DL>
</DL>
</DD>
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