Drawing vertical text like Identity-V encoding.

[tani]

Hi,

I understand that PDFToImage currently doesn't support drawing 
vertical text like Identity-V encoding. But I had to use it, 
so I tried to let it work with modification as show below.

Even though I don't know whether this code is proper or not, I
could make image files with vertical text PDF file.

I'm happy if this information is something useful.

Regards,
tani

diff --git a/pdfbox/src/main/java/org/apache/pdfbox/util/PDFStreamEngine.java 
b/pdfbox/src/main/java/org/apache/pdfbox/util/PDFStreamEngine.java
index ec1ed4a..0aae1b7 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/util/PDFStreamEngine.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/util/PDFStreamEngine.java
@@ -330,7 +330,16 @@ public class PDFStreamEngine
             Matrix adjMatrix = new Matrix();
             adjustment =- (adjustment / 1000) * horizontalScaling * fontsize;
             // TODO vertical writing mode
-            adjMatrix.setValue( 2, 0, adjustment );
+            //
+            // TODO: This is workaround for vertical writing mode by tani.
+            //       Check pdfbox official improvement.
+            //
+            if (getGraphicsState().getTextState().getFont().getCMap() != null
+                && 
getGraphicsState().getTextState().getFont().getCMap().getWMode() == 1) {
+                adjMatrix.setValue( 2, 1, adjustment ); // Adjust only Y axis.
+            } else {
+                adjMatrix.setValue( 2, 0, adjustment );
+            }
             showAdjustedTextRun(strings.get(i), adjMatrix);
         }
     }
@@ -472,9 +481,18 @@ public class PDFStreamEngine
             float ty = 0;
             // reset the matrix instead of creating a new one
             td.reset();
-            td.setValue(2, 0, tx);
-            td.setValue(2, 1, ty);
-
+            //
+            // TODO: This is workaround for vertical writing mode by tani.
+            //       Check pdfbox official improvement.
+            //
+            if (getGraphicsState().getTextState().getFont().getCMap() != null
+                && 
getGraphicsState().getTextState().getFont().getCMap().getWMode() == 1) {
+                td.setValue(2, 1, -tx); // Adjust only Y axis.
+            } else {
+                td.setValue(2, 0, tx);
+                td.setValue(2, 1, ty);
+            }
+            
             // The text matrix gets updated after each glyph is placed. The 
updated
             // version will have the X and Y coordinates for the next glyph.
             // textMatrixEnd contains the coordinates of the end of the last 
glyph without
@@ -488,7 +506,16 @@ public class PDFStreamEngine
             // add some spacing to the text matrix (see comment above)
             tx = (charHorizontalDisplacementText * fontSizeText + 
characterSpacingText +
                     spacingText) * horizontalScalingText;
-            td.setValue(2, 0, tx);
+            //
+            // TODO: This is workaround for vertical writing mode by tani.
+            //       Check pdfbox official improvement.
+            //
+            if (getGraphicsState().getTextState().getFont().getCMap() != null
+                && 
getGraphicsState().getTextState().getFont().getCMap().getWMode() == 1) {
+                td.setValue(2, 1, -tx); // Adjust only Y axis.
+            } else {
+                td.setValue(2, 0, tx);
+            }
             td.multiply(textMatrix, textMatrix);
 
             // determine the width of this character

--