line.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

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<A NAME="getY0()"><!-- --></A><H3>
getY0</H3>
<PRE>
public final double <B>getY0</B>()</PRE>
<DL>
<DD>Returns the <var>y</var> value for <var>x</var>==0.
 Coordinate (0, <var>y0</var>) is the intersection point with the <var>y</var> axis.
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</DD>
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<A NAME="getX0()"><!-- --></A><H3>
getX0</H3>
<PRE>
public final double <B>getX0</B>()</PRE>
<DL>
<DD>Returns the <var>x</var> value for <var>y</var>==0.
 Coordinate (<var>x0</var>,0) is the intersection point with the <var>x</var> axis.
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</DD>
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</DD>
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<A NAME="getSlope()"><!-- --></A><H3>
getSlope</H3>
<PRE>
public final double <B>getSlope</B>()</PRE>
<DL>
<DD>Returns the slope.
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<DD><DL>
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</DD>
<DD><DL>
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</DD>
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<A NAME="intersectionPoint(org.geotools.math.Line)"><!-- --></A><H3>
intersectionPoint</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/geom/Point2D.html" title="class or interface in java.awt.geom">Point2D</A> <B>intersectionPoint</B>(<A HREF="../../../org/geotools/math/Line.html" title="class in org.geotools.math">Line</A>&nbsp;line)</PRE>
<DL>
<DD>Returns the intersection point between this line and the specified one.
 If both lines are parallel, then this method returns .
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>line</CODE> - The line to intersect.
<DT><B>Returns:</B><DD>The intersection point, or .</DL>
</DD>
</DL>
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<A NAME="intersectionPoint(java.awt.geom.Line2D)"><!-- --></A><H3>
intersectionPoint</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/geom/Point2D.html" title="class or interface in java.awt.geom">Point2D</A> <B>intersectionPoint</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/geom/Line2D.html" title="class or interface in java.awt.geom">Line2D</A>&nbsp;line)</PRE>
<DL>
<DD>Returns the intersection point between this line and the specified bounded line.
 If both lines are parallel or if the specified  doesn't reach
 this line (since <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/geom/Line2D.html" title="class or interface in java.awt.geom"><CODE>Line2D</CODE></A> do not extends toward infinities), then this
 method returns .
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<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>line</CODE> - The bounded line to intersect.
<DT><B>Returns:</B><DD>The intersection point, or .</DL>
</DD>
</DL>
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<A NAME="nearestColinearPoint(java.awt.geom.Point2D)"><!-- --></A><H3>
nearestColinearPoint</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/geom/Point2D.html" title="class or interface in java.awt.geom">Point2D</A> <B>nearestColinearPoint</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/geom/Point2D.html" title="class or interface in java.awt.geom">Point2D</A>&nbsp;point)</PRE>
<DL>
<DD>Returns the nearest point on this line from the specified point.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>point</CODE> - An arbitrary point.
<DT><B>Returns:</B><DD>The point on this line which is the nearest of the specified .</DL>
</DD>
</DL>
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<A NAME="isoscelesTriangleBase(java.awt.geom.Point2D, double)"><!-- --></A><H3>
isoscelesTriangleBase</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/geom/Line2D.html" title="class or interface in java.awt.geom">Line2D</A> <B>isoscelesTriangleBase</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/geom/Point2D.html" title="class or interface in java.awt.geom">Point2D</A>&nbsp;summit,
                                    double&nbsp;sideLength)</PRE>
<DL>
<DD>Compute the base of a isosceles triangle having the specified summit and side length.
 The base will be colinear with this line. In other words, this method compute two
 points (<var>x1</var>,<var>y1</var>) and (<var>x2</var>,<var>y2</var>) located in
 such a way that:
 <ul>
   <li>Both points are on this line.</li>
   <li>The distance between any of the two points and the specified 
       is exactly .</li>
 </ul>
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>summit</CODE> - The summit of the isosceles triangle.<DD><CODE>sideLength</CODE> - The length for the two sides of the isosceles triangle.
<DT><B>Returns:</B><DD>The base of the isoscele triangle, colinear with this line, or 
         if the base can't be computed. If non-null, then the triangle is the figure formed
         by joining (<var>x1</var>,<var>y1</var>), (<var>x2</var>,<var>y2</var>) and
         .</DL>
</DD>
</DL>
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<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 line. This method returns
 the linear equation in the form <code>"y=m*x+b"</code>.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>A string representation of this line.</DL>
</DD>
</DL>
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<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 object with the specified one for equality.
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<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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<A NAME="hashCode()"><!-- --></A><H3>
hashCode</H3>
<PRE>
public int <B>hashCode</B>()</PRE>
<DL>
<DD>Returns a hash code value for this line.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
</DL>
</DD>
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<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 line.
<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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