Author: danielwilson
Date: Sat Feb 27 02:25:16 2010
New Revision: 916894
URL: http://svn.apache.org/viewvc?rev=916894&view=rev
Log:
Initial implementation of an Eval method for types 2 & 3.
These may need some adjustment, but as far as I can tell, they're according to
the spec.
Modified:
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDDictionaryFunction.java
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunction.java
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType0.java
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType2.java
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType3.java
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType4.java
Modified:
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDDictionaryFunction.java
URL:
http://svn.apache.org/viewvc/pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDDictionaryFunction.java?rev=916894&r1=916893&r2=916894&view=diff
==============================================================================
---
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDDictionaryFunction.java
(original)
+++
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDDictionaryFunction.java
Sat Feb 27 02:25:16 2010
@@ -74,7 +74,7 @@
return function;
}
- private COSArray getRangeArray( String fieldName, int n )
+ protected COSArray getRangeArray( String fieldName, int n )
{
COSArray rangeArray = (COSArray)function.getDictionaryObject(
COSName.getPDFName( "Range" ) );
if( rangeArray == null )
Modified:
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunction.java
URL:
http://svn.apache.org/viewvc/pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunction.java?rev=916894&r1=916893&r2=916894&view=diff
==============================================================================
---
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunction.java
(original)
+++
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunction.java
Sat Feb 27 02:25:16 2010
@@ -22,6 +22,7 @@
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSObject;
import org.apache.pdfbox.cos.COSStream;
+import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.pdmodel.common.COSObjectable;
import org.apache.pdfbox.pdmodel.common.PDRange;
import org.apache.pdfbox.pdmodel.common.PDStream;
@@ -152,4 +153,14 @@
*/
public abstract void setDomainForInput(PDRange range, int n);
+
+ /**
+ * Evaluates the function at the given input.
+ * ReturnValue = f(input)
+ *
+ * @param input The array of input values for the function. In many cases
will be an array of a single value, but not always.
+ * @return The of outputs the function returns based on those inputs. In
many cases will be an array of a single value, but not always.
+ */
+ public abstract COSArray Eval(COSArray input) throws IOException;
+
}
Modified:
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType0.java
URL:
http://svn.apache.org/viewvc/pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType0.java?rev=916894&r1=916893&r2=916894&view=diff
==============================================================================
---
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType0.java
(original)
+++
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType0.java
Sat Feb 27 02:25:16 2010
@@ -17,6 +17,7 @@
package org.apache.pdfbox.pdmodel.common.function;
import java.util.List;
+import java.io.IOException;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSFloat;
@@ -183,4 +184,14 @@
encode.set( paramNum*2, new COSFloat( range.getMin() ) );
encode.set( paramNum*2+1, new COSFloat( range.getMax() ) );
}
+
+ /**
+ * {...@inheritdoc}
+ */
+ public COSArray Eval(COSArray input) throws IOException
+ {
+ //This involves linear interpolation based on a set of sample points.
+ //Theoretically it's not that difficult ... see section 3.9.1 of the
PDF Reference.
+ throw new IOException("Not Implemented");
+ }
}
Modified:
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType2.java
URL:
http://svn.apache.org/viewvc/pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType2.java?rev=916894&r1=916893&r2=916894&view=diff
==============================================================================
---
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType2.java
(original)
+++
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType2.java
Sat Feb 27 02:25:16 2010
@@ -16,7 +16,12 @@
*/
package org.apache.pdfbox.pdmodel.common.function;
+import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
+import org.apache.pdfbox.cos.COSFloat;
+import org.apache.pdfbox.cos.COSName;
+import java.io.IOException;
+import java.lang.Math;
/**
* This class represents a type 2 function in a PDF document.
@@ -26,6 +31,8 @@
*/
public class PDFunctionType2 extends PDDictionaryFunction
{
+
+ private COSArray C0, C1;
/**
* Constructor to create a new blank type 2 function.
@@ -45,4 +52,53 @@
super( functionDictionary );
}
+ /**
+ * {...@inheritdoc}
+ */
+ public COSArray Eval(COSArray input) throws IOException
+ {
+ //This function performs exponential interpolation.
+ //It uses only a single value as its input, but may produce a
multi-valued output.
+ //See PDF Reference section 3.9.2.
+
+ double x = input.toFloatArray()[0];
+ COSArray y = new COSArray();
+ for (int j=0;j<getC0().size();j++)
+ {
+ //y[j] = C0[j] + x^N*(C1[j] - C0[j])
+ float FofX =(float)( ((COSFloat)C0.get(j)).floatValue() +
java.lang.Math.pow(x,(double)getN())*(((COSFloat)C1.get(j)).floatValue() -
((COSFloat)C0.get(j)).floatValue()) );
+ y.add( new COSFloat( FofX));
+ }
+
+ return y;
+ }
+
+ protected COSArray getC0()
+ {
+ if(C0 == null)
+ {
+ C0 = getRangeArray("C0",1);
+ }
+ return C0;
+ }
+
+ protected COSArray getC1()
+ {
+ if(C1 == null)
+ {
+ //can't use getRangeArray here as the default is 1.0, not 0.0.
+ C1 = (COSArray)getCOSDictionary().getDictionaryObject(
COSName.getPDFName( "C1" ) );
+ if( C1 == null )
+ {
+ C1 = new COSArray();
+ getCOSDictionary().setItem( "C1", C1 );
+ C1.add( new COSFloat( 1 ) );
+ }
+ }
+ return C1;
+ }
+
+ protected float getN(){
+ return getCOSDictionary().getFloat("N");
+ }
}
Modified:
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType3.java
URL:
http://svn.apache.org/viewvc/pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType3.java?rev=916894&r1=916893&r2=916894&view=diff
==============================================================================
---
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType3.java
(original)
+++
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType3.java
Sat Feb 27 02:25:16 2010
@@ -16,7 +16,11 @@
*/
package org.apache.pdfbox.pdmodel.common.function;
+import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSDictionary;
+import org.apache.pdfbox.cos.COSFloat;
+import org.apache.pdfbox.cos.COSName;
+import java.io.IOException;
/**
* This class represents a type 3 function in a PDF document.
@@ -45,4 +49,60 @@
super( functionDictionary );
}
+ /**
+ * {...@inheritdoc}
+ */
+ public COSArray Eval(COSArray input) throws IOException
+ {
+ //This function is known as a "stitching" function. Based on the
input, it decides which child function to call.
+ //See PDF Reference section 3.9.3.
+
+ PDFunction F=null;
+ float x = ((COSFloat)input.get(0)).floatValue();
+ COSArray Domain = getDomainForInput(1).getCOSArray();
+
+ if (getBounds().size() == 0)
+ {
+ F = PDFunction.create(getFunctions().get(0));
+ }
+ else
+ {
+ //check boundary conditions first ...
+ if (x < ((COSFloat)Domain.get(0)).floatValue())
+ F = PDFunction.create(getFunctions().get(0));
+ else if (x > ((COSFloat)Domain.get(1)).floatValue())
+ F =
PDFunction.create(getFunctions().get(getFunctions().size()-1));
+ else
+ {
+ float[] fBounds = getBounds().toFloatArray();
+ for (int k = 0; k<getBounds().size(); k++){
+ if (x <= fBounds[k])
+ {
+ F = PDFunction.create(getFunctions().get(k));
+ break;
+ }
+ }
+ if(F==null) //must be in last partition
+ {
+ F =
PDFunction.create(getFunctions().get(getFunctions().size()-1));
+ }
+ }
+ }
+ return F.Eval(input);
+ }
+
+ protected COSArray getFunctions()
+ {
+ return (COSArray)(getCOSDictionary().getDictionaryObject(
COSName.getPDFName( "Functions" ) ));
+ }
+
+ protected COSArray getBounds()
+ {
+ return (COSArray)(getCOSDictionary().getDictionaryObject(
COSName.getPDFName( "Bounds" ) ));
+ }
+
+ protected COSArray getEncode()
+ {
+ return (COSArray)(getCOSDictionary().getDictionaryObject(
COSName.getPDFName( "Encode" ) ));
+ }
}
Modified:
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType4.java
URL:
http://svn.apache.org/viewvc/pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType4.java?rev=916894&r1=916893&r2=916894&view=diff
==============================================================================
---
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType4.java
(original)
+++
pdfbox/trunk/src/main/java/org/apache/pdfbox/pdmodel/common/function/PDFunctionType4.java
Sat Feb 27 02:25:16 2010
@@ -18,6 +18,8 @@
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.common.PDStream;
+import org.apache.pdfbox.cos.COSArray;
+import java.io.IOException;
/**
* This class represents a type 4 function in a PDF document.
@@ -47,4 +49,15 @@
{
super( functionDictionary );
}
+
+
+ /**
+ * {...@inheritdoc}
+ */
+ public COSArray Eval(COSArray input) throws IOException
+ {
+ //Implementation here will require evaluation of PostScript functions.
+ //See section 3.9.4 of the PDF Reference.
+ throw new IOException("Not Implemented");
+ }
}
