From 4f296fc3f837412b330f5a5183769dba50704649 Mon Sep 17 00:00:00 2001
From: pdanner <pdanner@7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c>
Date: Tue, 9 Nov 2010 10:34:41 +0000
Subject: signature positioning bugfix

git-svn-id: https://joinup.ec.europa.eu/svn/pdf-as/trunk@607 7b5415b0-85f9-ee4d-85bd-d5d0c3b42d1c
---
 .../at/knowcenter/wag/egov/egiz/pdf/PDFPage.java   | 287 +++------------------
 1 file changed, 36 insertions(+), 251 deletions(-)

diff --git a/src/main/java/at/knowcenter/wag/egov/egiz/pdf/PDFPage.java b/src/main/java/at/knowcenter/wag/egov/egiz/pdf/PDFPage.java
index 0bae3d2..cb4e642 100644
--- a/src/main/java/at/knowcenter/wag/egov/egiz/pdf/PDFPage.java
+++ b/src/main/java/at/knowcenter/wag/egov/egiz/pdf/PDFPage.java
@@ -88,248 +88,6 @@ public class PDFPage extends PDFTextStripper
     operators.put("Do", newInvoke);
   }
 
-  // /**
-  // * You should override this method if you want to perform an action when a
-  // * string is being shown.
-  // *
-  // * @param string The string to display.
-  // *
-  // * @throws IOException If there is an error showing the string
-  // */
-  // public void showString( byte[] string ) throws IOException
-  // {
-  // float spaceWidth = 0;
-  // float spacing = 0;
-  // StringBuffer stringResult = new StringBuffer(string.length);
-  //      
-  // float characterDisplacement = 0;
-  // float spaceDisplacement = 0;
-  //      
-  // PDGraphicsState graphicsState = getGraphicsState();
-  // float fontSize = graphicsState.getTextState().getFontSize();
-  // float horizontalScaling =
-  // graphicsState.getTextState().getHorizontalScalingPercent()/100f;
-  // float rise = graphicsState.getTextState().getRise();
-  // final float wordSpacing = graphicsState.getTextState().getWordSpacing();
-  // final float characterSpacing =
-  // graphicsState.getTextState().getCharacterSpacing();
-  // float wordSpacingDisplacement = 0;
-  //      
-  // PDFont font = graphicsState.getTextState().getFont();
-  //      
-  // //This will typically be 1000 but in the case of a type3 font
-  // //this might be a different number
-  // float glyphSpaceToTextSpaceFactor = 1f/font.getFontMatrix().getValue( 0, 0
-  // );
-  // Float averageWidth = (Float)fontToAverageWidths.get( font );
-  // if( averageWidth == null )
-  // {
-  // averageWidth = new Float( font.getAverageFontWidth() );
-  // fontToAverageWidths.put( font, averageWidth );
-  // }
-  //
-  // Matrix initialMatrix = new Matrix();
-  // initialMatrix.setValue(0,0,1);
-  // initialMatrix.setValue(0,1,0);
-  // initialMatrix.setValue(0,2,0);
-  // initialMatrix.setValue(1,0,0);
-  // initialMatrix.setValue(1,1,1);
-  // initialMatrix.setValue(1,2,0);
-  // initialMatrix.setValue(2,0,0);
-  // initialMatrix.setValue(2,1,rise);
-  // initialMatrix.setValue(2,2,1);
-  //
-  //
-  // //this
-  // int codeLength = 1;
-  // Matrix ctm = graphicsState.getCurrentTransformationMatrix();
-  //      
-  // //lets see what the space displacement should be
-  // spaceDisplacement = (font.getFontWidth( SPACE_BYTES, 0, 1
-  // )/glyphSpaceToTextSpaceFactor);
-  // if( spaceDisplacement == 0 )
-  // {
-  // spaceDisplacement =
-  // (averageWidth.floatValue()/glyphSpaceToTextSpaceFactor);
-  // //The average space width appears to be higher than necessary
-  // //so lets make it a little bit smaller.
-  // spaceDisplacement *= .80f;
-  // if( log.isDebugEnabled() )
-  // {
-  // log.debug( "Font: Space From Average=" + spaceDisplacement );
-  // }
-  // }
-  // int pageRotation = page.findRotation();
-  //      
-  // // very strange.... the ctms are multiplied by right, but suddenly the
-  // textM is multiplied from the left.
-  // // but: PDF matrices are multiplied from left ==> ctm is wrong
-  // Matrix trm = initialMatrix.multiply( textMatrix ).multiply( ctm );
-  // float x = trm.getValue(2,0);
-  // float y = trm.getValue(2,1);
-  // float flipped_y = -y + page.findMediaBox().getHeight();
-  // if( pageRotation == 0 )
-  // {
-  // trm.setValue( 2,1, flipped_y );
-  // }
-  // else if( pageRotation == 90 )
-  // {
-  // trm.setValue( 2,0, y );
-  // trm.setValue( 2,1, x );
-  // }
-  // else if( pageRotation == 270 )
-  // {
-  // trm.setValue( 2,0, flipped_y );
-  // trm.setValue( 2,1, x );
-  // }
-  // for( int i=0; i<string.length; i+=codeLength )
-  // {
-  // if( log.isDebugEnabled() )
-  // {
-  // log.debug( "initialMatrix=" + initialMatrix );
-  // log.debug( "textMatrix=" + textMatrix );
-  // log.debug( "initialMatrix.multiply( textMatrix )=" +
-  // initialMatrix.multiply( textMatrix ) );
-  // log.debug( "ctm=" + ctm );
-  // log.debug( "trm=" + initialMatrix.multiply( textMatrix ).multiply( ctm ) );
-  // }
-  // codeLength = 1;
-  //
-  // String c = font.encode( string, i, codeLength );
-  //
-  // if( log.isDebugEnabled() )
-  // {
-  // log.debug( "Character Code=" + string[i] + "='" + c + "'" );
-  // }
-  // if( c == null && i+1<string.length)
-  // {
-  // //maybe a multibyte encoding
-  // codeLength++;
-  // if( log.isDebugEnabled() )
-  // {
-  // log.debug( "Multibyte Character Code=" + string[i] + string[i+1] );
-  // }
-  // c = font.encode( string, i, codeLength );
-  // }
-  // stringResult.append( c );
-  //
-  // //todo, handle horizontal displacement
-  // characterDisplacement += (font.getFontWidth( string, i, codeLength
-  // )/glyphSpaceToTextSpaceFactor);
-  //
-  //
-  // // PDF Spec - 5.5.2 Word Spacing
-  // //
-  // // Word spacing works the same was as character spacing, but applies
-  // // only to the space character, code 32.
-  // //
-  // // Note: Word spacing is applied to every occurrence of the single-byte
-  // // character code 32 in a string. This can occur when using a simple
-  // // font or a composite font that defines code 32 as a single-byte code.
-  // // It does not apply to occurrences of the byte value 32 in multiple-byte
-  // // codes.
-  // //
-  // // RDD - My interpretation of this is that only character code 32's that
-  // // encode to spaces should have word spacing applied. Cases have been
-  // // observed where a font has a space character with a character code
-  // // other than 32, and where word spacing (Tw) was used. In these cases,
-  // // applying word spacing to either the non-32 space or to the character
-  // // code 32 non-space resulted in errors consistent with this
-  // interpretation.
-  // //
-  //          
-  // boolean withCS = false;
-  // if( (string[i] == 0x20) && c.equals( " " ) )
-  // {
-  // spacing += wordSpacing + characterSpacing;
-  // withCS = true;
-  // }
-  // else
-  // {
-  // spacing += characterSpacing;
-  // }
-  //
-  // if( log.isDebugEnabled() )
-  // {
-  // log.debug( "Checking code '" + c + "' font=" +
-  // graphicsState.getTextState().getFont() +
-  // " Tc=" + characterSpacing +
-  // " Tw=" + wordSpacing +
-  // " fontSize=" + fontSize +
-  // " horizontalScaling=" + horizontalScaling +
-  // " totalDisp=" + characterDisplacement +
-  // " spacing=" + spacing + "(" + withCS + ")" );
-  // }
-  // // We want to update the textMatrix using the width, in text space units.
-  // //
-  //          
-  // }
-  //      
-  // //The adjustment will always be zero. The adjustment as shown in the
-  // //TJ operator will be handled separately.
-  // float adjustment=0;
-  // //todo, need to compute the horizontal displacement
-  // float ty = 0;
-  // float tx =
-  // ((characterDisplacement-adjustment/glyphSpaceToTextSpaceFactor)*fontSize +
-  // spacing)
-  // *horizontalScaling;
-  //      
-  // if( log.isDebugEnabled() )
-  // {
-  // log.debug( "disp=" + characterDisplacement + " adj=" + adjustment +
-  // " fSize=" + fontSize + " tx=" + tx );
-  // }
-  //      
-  // float xScale = trm.getXScale();
-  // float yScale = trm.getYScale();
-  // float xPos = trm.getXPosition();
-  // float yPos = trm.getYPosition();
-  // spaceWidth = spaceDisplacement * xScale * fontSize;
-  // wordSpacingDisplacement = wordSpacing*xScale * fontSize;
-  // Matrix td = new Matrix();
-  // td.setValue( 2, 0, tx );
-  // td.setValue( 2, 1, ty );
-  //      
-  // if( log.isDebugEnabled() )
-  // {
-  // log.debug( "TRM=" + trm );
-  // log.debug( "TextMatrix before " + textMatrix );
-  // }
-  // float xPosBefore = textMatrix.getXPosition();
-  // float yPosBefore = textMatrix.getYPosition();
-  // textMatrix = td.multiply( textMatrix );
-  // if( log.isDebugEnabled() )
-  // {
-  // log.debug( "TextMatrix after " + textMatrix );
-  // }
-  // float totalStringDisplacement = 0;
-  // if( pageRotation == 0 )
-  // {
-  // totalStringDisplacement = (textMatrix.getXPosition() - xPosBefore);
-  // }
-  // else if( pageRotation == 90 )
-  // {
-  // totalStringDisplacement = (textMatrix.getYPosition() - yPosBefore);
-  // }
-  // else if( pageRotation == 270 )
-  // {
-  // totalStringDisplacement = (yPosBefore - textMatrix.getYPosition());
-  // }
-  // showCharacter(
-  // new TextPosition(
-  // xPos,
-  // yPos,
-  // xScale,
-  // yScale,
-  // totalStringDisplacement,
-  // spaceWidth,
-  // stringResult.toString(),
-  // graphicsState.getTextState().getFont(),
-  // graphicsState.getTextState().getFontSize(),
-  // wordSpacingDisplacement ));
-  // }
-  //  
 
   protected void processOperator(PDFOperator operator, List arguments) throws IOException
   {
@@ -338,6 +96,7 @@ public class PDFPage extends PDFTextStripper
     super.processOperator(operator, arguments);
   }
 
+  // exthex
   /**
    * A method provided as an event interface to allow a subclass to perform some
    * specific functionality when a character needs to be displayed. This method
@@ -429,7 +188,16 @@ public class PDFPage extends PDFTextStripper
         
         Pos [] transformed_coordinates = transtormCoordinates(coordinates, ctm);
         
+        /**********************************************************
+         * pdf-as fix:
+         * calculating min and max point of an image to look where
+         * the signature should be placed
+         * fix solves problems with footer and images and
+         * placement of the signature in an image only pdf document
+         **********************************************************/
+        
         float actual_lowest_point = Float.NaN;
+        float actual_starting_point = Float.NaN;
         
         int pageRotation = page.findRotation();
         logger_.debug("PageRotation = " + pageRotation);
@@ -439,38 +207,44 @@ public class PDFPage extends PDFTextStripper
           logger_.debug("min_y = " + min_y);
           float page_height = page.findMediaBox().getHeight();
           logger_.debug("page_height = " + page_height);
-
+          
           actual_lowest_point = page_height - min_y;
+          actual_starting_point = page_height - findMaxY(transformed_coordinates);
         }
         if (pageRotation == 90)
         {
           float max_x = findMaxX(transformed_coordinates);
           logger_.debug("max_x = " + max_x);
-//          float page_width = page.findMediaBox().getWidth();
-//          logger_.debug("page_width = " + page_width);
+          float page_width = page.findMediaBox().getWidth();
+          logger_.debug("page_width = " + page_width);
 
           actual_lowest_point = max_x;
+          actual_starting_point = findMinX(transformed_coordinates);   
         }
         if (pageRotation == 180)
         {
           float min_y = findMinY(transformed_coordinates);
           logger_.debug("min_y = " + min_y);
-          actual_lowest_point = min_y;
+          float page_height = page.findMediaBox().getHeight();
+          actual_lowest_point = page_height - findMaxY(transformed_coordinates);
+          actual_starting_point = page_height - min_y;
         }
         if (pageRotation == 270)
         {
           float min_x = findMinX(transformed_coordinates);
           logger_.debug("min_x = " + min_x);
-//          float page_width = page.findMediaBox().getWidth();
-//          logger_.debug("page_width = " + page_width);
-
-          actual_lowest_point = min_x;
+          
+          float page_width = page.findMediaBox().getWidth();
+          logger_.debug("page_width = " + page_width);
+          
+          actual_lowest_point = page_width - min_x;
+          actual_starting_point = page_width - findMaxX(transformed_coordinates);   
         }
 
         
         logger_.debug("actual_lowest_point = " + actual_lowest_point);
         
-        if (actual_lowest_point > PDFPage.this.footer_line)
+        if (actual_lowest_point > PDFPage.this.footer_line && actual_starting_point > PDFPage.this.footer_line)
         {
           logger_.debug("image is below footer_line. footer_line = " + PDFPage.this.footer_line);
           return;
@@ -533,6 +307,17 @@ public class PDFPage extends PDFTextStripper
     }
     return min;
   }
+  
+	public static float findMaxY(Pos[] coordinates) {
+		float max = 0;
+		for (int i = 0; i < coordinates.length; i++) {
+			if (coordinates[i].y > max) {
+				max = coordinates[i].y;
+			}
+		}
+		return max;
+	}
+  
   public static float findMaxX (Pos [] coordinates)
   {
     float max = Float.NEGATIVE_INFINITY;
-- 
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