abstractcoverage.renderable.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

                                           <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/RenderingHints.html" title="class or interface in java.awt">RenderingHints</A>&nbsp;hints)</PRE>
<DL>
<DD>Creates a rendered image with width  and height
  in pixels. If  is 0, it will be computed
 automatically from . Conversely, if  is
 0, il will be computed automatically from .
 
 The default implementation creates a render context with
 <A HREF="../../../org/geotools/coverage/AbstractCoverage.Renderable.html#createRenderContext(java.awt.geom.Rectangle2D, java.awt.RenderingHints)"><CODE>createRenderContext(java.awt.geom.Rectangle2D, java.awt.RenderingHints)</CODE></A> and invokes
 <A HREF="../../../org/geotools/coverage/AbstractCoverage.Renderable.html#createRendering(java.awt.image.renderable.RenderContext)"><CODE>createRendering(RenderContext)</CODE></A>.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/image/renderable/RenderableImage.html#createScaledRendering(int, int, java.awt.RenderingHints)" title="class or interface in java.awt.image.renderable">createScaledRendering</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/image/renderable/RenderableImage.html" title="class or interface in java.awt.image.renderable">RenderableImage</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>width</CODE> - The width of rendered image in pixels, or 0.<DD><CODE>height</CODE> - The height of rendered image in pixels, or 0.<DD><CODE>hints</CODE> - Rendering hints, or .
<DT><B>Returns:</B><DD>A rendered image containing the rendered data</DL>
</DD>
</DL>
<HR>

<A NAME="createRendering(java.awt.image.renderable.RenderContext)"><!-- --></A><H3>
createRendering</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/image/RenderedImage.html" title="class or interface in java.awt.image">RenderedImage</A> <B>createRendering</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/image/renderable/RenderContext.html" title="class or interface in java.awt.image.renderable">RenderContext</A>&nbsp;context)</PRE>
<DL>
<DD>Creates a rendered image using a given render context. This method
 will uses an "<A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/ImageFunctionDescriptor.html" title="class or interface in javax.media.jai.operator"><CODE>ImageFunction</CODE></A>"
 operation if possible (i.e. if the area of interect is rectangular
 and the affine transform contains only translation and scale
 coefficients).
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/image/renderable/RenderableImage.html#createRendering(java.awt.image.renderable.RenderContext)" title="class or interface in java.awt.image.renderable">createRendering</A></CODE> in interface <CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/image/renderable/RenderableImage.html" title="class or interface in java.awt.image.renderable">RenderableImage</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>context</CODE> - The render context to use to produce the rendering.
<DT><B>Returns:</B><DD>A rendered image containing the rendered data</DL>
</DD>
</DL>
<HR>

<A NAME="createRenderContext(java.awt.geom.Rectangle2D, java.awt.RenderingHints)"><!-- --></A><H3>
createRenderContext</H3>
<PRE>
protected <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/image/renderable/RenderContext.html" title="class or interface in java.awt.image.renderable">RenderContext</A> <B>createRenderContext</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/geom/Rectangle2D.html" title="class or interface in java.awt.geom">Rectangle2D</A>&nbsp;gridBounds,
                                            <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/RenderingHints.html" title="class or interface in java.awt">RenderingHints</A>&nbsp;hints)</PRE>
<DL>
<DD>Initialize a render context with an affine transform that maps the
 coverage envelope to the specified destination rectangle. The affine
 transform mays swap axis in order to normalize their order (i.e. make
 them appear in the (<var>x</var>,<var>y</var>) order), so that
 the image appears properly oriented when rendered.
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>gridBounds</CODE> - The two-dimensional destination rectangle.<DD><CODE>hints</CODE> - The rendering hints, or  if none.
<DT><B>Returns:</B><DD>A render context initialized with an affine transform from the coverage
         to the grid coordinate system. This transform is the inverse of
         <A HREF="../../../org/geotools/coverage/grid/GridGeometry2D.html#getGridToCRS2D()"><CODE>GridGeometry2D.getGridToCRS2D()</CODE></A>.<DT><B>See Also:</B><DD><A HREF="../../../org/geotools/coverage/grid/GridGeometry2D.html#getGridToCRS2D()"><CODE>GridGeometry2D.getGridToCRS2D()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="getNumElements()"><!-- --></A><H3>
getNumElements</H3>
<PRE>
public int <B>getNumElements</B>()</PRE>
<DL>
<DD>Returns the number of elements per value at each position. This is
 the maximum value plus 1 allowed in  methods
 invocation. The default implementation returns the number of sample
 dimensions in the coverage.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/ImageFunction.html#getNumElements()" title="class or interface in javax.media.jai">getNumElements</A></CODE> in interface <CODE><A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/ImageFunction.html" title="class or interface in javax.media.jai">ImageFunction</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getElements(float, float, float, float, int, int, int, float[], float[])"><!-- --></A><H3>
getElements</H3>
<PRE>
public void <B>getElements</B>(float&nbsp;startX,
                        float&nbsp;startY,
                        float&nbsp;deltaX,
                        float&nbsp;deltaY,
                        int&nbsp;countX,
                        int&nbsp;countY,
                        int&nbsp;element,
                        float[]&nbsp;real,
                        float[]&nbsp;imag)</PRE>
<DL>
<DD>Returns all values of a given element for a specified set of coordinates.
 This method is automatically invoked at rendering time for populating an
 image tile, providing that the rendered image is created using the
 "<A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/ImageFunctionDescriptor.html" title="class or interface in javax.media.jai.operator"><CODE>ImageFunction</CODE></A>" operator and the image
 type is not . The default implementation invokes
 <A HREF="../../../org/geotools/coverage/AbstractCoverage.html#evaluate(org.opengis.spatialschema.geometry.DirectPosition, float[])"><CODE>AbstractCoverage.evaluate(DirectPosition,float[])</CODE></A> recursively.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/ImageFunction.html#getElements(float, float, float, float, int, int, int, float[], float[])" title="class or interface in javax.media.jai">getElements</A></CODE> in interface <CODE><A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/ImageFunction.html" title="class or interface in javax.media.jai">ImageFunction</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getElements(double, double, double, double, int, int, int, double[], double[])"><!-- --></A><H3>
getElements</H3>
<PRE>
public void <B>getElements</B>(double&nbsp;startX,
                        double&nbsp;startY,
                        double&nbsp;deltaX,
                        double&nbsp;deltaY,
                        int&nbsp;countX,
                        int&nbsp;countY,
                        int&nbsp;element,
                        double[]&nbsp;real,
                        double[]&nbsp;imag)</PRE>
<DL>
<DD>Returns all values of a given element for a specified set of coordinates.
 This method is automatically invoked at rendering time for populating an
 image tile, providing that the rendered image is created using the
 "<A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/ImageFunctionDescriptor.html" title="class or interface in javax.media.jai.operator"><CODE>ImageFunction</CODE></A>" operator and the image
 type is . The default implementation invokes
 <A HREF="../../../org/geotools/coverage/AbstractCoverage.html#evaluate(org.opengis.spatialschema.geometry.DirectPosition, double[])"><CODE>AbstractCoverage.evaluate(DirectPosition,double[])</CODE></A> recursively.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/ImageFunction.html#getElements(double, double, double, double, int, int, int, double[], double[])" title="class or interface in javax.media.jai">getElements</A></CODE> in interface <CODE><A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/ImageFunction.html" title="class or interface in javax.media.jai">ImageFunction</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
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