plane.html

Geotools是一个开源的Java GIS工具包,可利用它来开发符合标准的地理信息系统。Geotools提供了OGC(Open Geospatial Consortium)规范的一个实现来作为他们的

 <var><strong>c</strong></var>+<var>cx</var>*<var>x</var>+<var>cy</var>*<var>y</var>.
<P>
<DL>
</DL>
</DL>
<HR>

<A NAME="cx"><!-- --></A><H3>
cx</H3>
<PRE>
public double <B>cx</B></PRE>
<DL>
<DD>The <var>cx</var> coefficient for this plane. This coefficient appears in the place equation
 <var>c</var>+<var><strong>cx</strong></var>*<var>x</var>+<var>cy</var>*<var>y</var>.
<P>
<DL>
</DL>
</DL>
<HR>

<A NAME="cy"><!-- --></A><H3>
cy</H3>
<PRE>
public double <B>cy</B></PRE>
<DL>
<DD>The <var>cy</var> coefficient for this plane. This coefficient appears in the place equation
 <var>c</var>+<var>cx</var>*<var>x</var>+<var><strong>cy</strong></var>*<var>y</var>.
<P>
<DL>
</DL>
</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

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<B>Constructor Detail</B></FONT></TD>
</TR>
</TABLE>

<A NAME="Plane()"><!-- --></A><H3>
Plane</H3>
<PRE>
public <B>Plane</B>()</PRE>
<DL>
<DD>Construct a new plane. All coefficients are set to 0.
<P>
</DL>

<!-- ============ METHOD DETAIL ========== -->

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<B>Method Detail</B></FONT></TD>
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<A NAME="z(double, double)"><!-- --></A><H3>
z</H3>
<PRE>
public final double <B>z</B>(double&nbsp;x,
                      double&nbsp;y)</PRE>
<DL>
<DD>Compute the <var>z</var> value for the specified (<var>x</var>,<var>y</var>) point.
 The <var>z</var> value is computed using the following equation:

 <blockquote><code>
   z(x,y) = c + cx*x + cy*y
 </code></blockquote>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>x</CODE> - The <var>x</var> value.<DD><CODE>y</CODE> - The <var>y</var> value.
<DT><B>Returns:</B><DD>The <var>z</var> value.</DL>
</DD>
</DL>
<HR>

<A NAME="y(double, double)"><!-- --></A><H3>
y</H3>
<PRE>
public final double <B>y</B>(double&nbsp;x,
                      double&nbsp;z)</PRE>
<DL>
<DD>Compute the <var>y</var> value for the specified (<var>x</var>,<var>z</var>) point.
 The <var>y</var> value is computed using the following equation:

 <blockquote><code>
   y(x,z) = (z - (c+cx*x)) / cy
 </code></blockquote>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>x</CODE> - The <var>x</var> value.<DD><CODE>z</CODE> - The <var>y</var> value.
<DT><B>Returns:</B><DD>The <var>y</var> value.</DL>
</DD>
</DL>
<HR>

<A NAME="x(double, double)"><!-- --></A><H3>
x</H3>
<PRE>
public final double <B>x</B>(double&nbsp;y,
                      double&nbsp;z)</PRE>
<DL>
<DD>Compute the <var>x</var> value for the specified (<var>y</var>,<var>z</var>) point.
 The <var>x</var> value is computed using the following equation:

 <blockquote><code>
   x(y,z) = (z - (c+cy*y)) / cx
 </code></blockquote>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>y</CODE> - The <var>x</var> value.<DD><CODE>z</CODE> - The <var>y</var> value.
<DT><B>Returns:</B><DD>The <var>x</var> value.</DL>
</DD>
</DL>
<HR>

<A NAME="setPlane(javax.vecmath.Point3d, javax.vecmath.Point3d, javax.vecmath.Point3d)"><!-- --></A><H3>
setPlane</H3>
<PRE>
public void <B>setPlane</B>(<A HREF="http://java.sun.com/products/java-media/3D/forDevelopers/j3dapi/javax/vecmath/Point3d.html" title="class or interface in javax.vecmath">Point3d</A>&nbsp;P1,
                     <A HREF="http://java.sun.com/products/java-media/3D/forDevelopers/j3dapi/javax/vecmath/Point3d.html" title="class or interface in javax.vecmath">Point3d</A>&nbsp;P2,
                     <A HREF="http://java.sun.com/products/java-media/3D/forDevelopers/j3dapi/javax/vecmath/Point3d.html" title="class or interface in javax.vecmath">Point3d</A>&nbsp;P3)
              throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/ArithmeticException.html" title="class or interface in java.lang">ArithmeticException</A></PRE>
<DL>
<DD>Computes the plane's coefficients from the specified points.  Three points
 are enough for determining exactly the plan, providing that the points are
 not colinear.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/ArithmeticException.html" title="class or interface in java.lang">ArithmeticException</A></CODE> - If the three points are colinear.</DL>
</DD>
</DL>
<HR>

<A NAME="setPlane(double[], double[], double[])"><!-- --></A><H3>
setPlane</H3>
<PRE>
public void <B>setPlane</B>(double[]&nbsp;x,
                     double[]&nbsp;y,
                     double[]&nbsp;z)
              throws <A HREF="http://java.sun.com/products/java-media/3D/forDevelopers/j3dapi/javax/vecmath/MismatchedSizeException.html" title="class or interface in javax.vecmath">MismatchedSizeException</A></PRE>
<DL>
<DD>Compute the plane's coefficients from a set of points. This method use
 a linear regression in the least-square sense. Result is undertermined
 if all points are colinear.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>x</CODE> - vector of <var>x</var> coordinates<DD><CODE>y</CODE> - vector of <var>y</var> coordinates<DD><CODE>z</CODE> - vector of <var>z</var> values
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/products/java-media/3D/forDevelopers/j3dapi/javax/vecmath/MismatchedSizeException.html" title="class or interface in javax.vecmath">MismatchedSizeException</A></CODE> - if <var>x</var>, <var>y</var> and <var>z</var>
         don't have the same length.</DL>
</DD>
</DL>
<HR>

<A NAME="toString()"><!-- --></A><H3>
toString</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>toString</B>()</PRE>
<DL>
<DD>Returns a string representation of this plane.
 The string will contains the plane's equation, as below:
 
 <blockquote>
     <var>z</var>(<var>x</var>,<var>y</var>) = <A HREF="../../../org/geotools/math/Plane.html#c"><CODE>c</CODE></A> +
     <A HREF="../../../org/geotools/math/Plane.html#cx"><CODE>cx</CODE></A>*<var>x</var> + <A HREF="../../../org/geotools/math/Plane.html#cy"><CODE>cy</CODE></A>*<var>y</var>
 </blockquote>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="equals(java.lang.Object)"><!-- --></A><H3>
equals</H3>
<PRE>
public boolean <B>equals</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;object)</PRE>
<DL>
<DD>Compare this plane with the specified object for equality.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>Returns a hash code value for this plane.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="clone()"><!-- --></A><H3>
clone</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <B>clone</B>()</PRE>
<DL>
<DD>Returns a clone of this plane.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>clone</CODE> in interface <CODE>Cloneable</CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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