From: Peter Bernard West <pbwest@apache.org>
Date: Fri, 30 Apr 2004 00:34:50 +0000 (+0000)
Subject: Changing from Adobe 1st quadrant co-ordinates to Java page co-ordinates
X-Git-Tag: Defoe_export~210
X-Git-Url: https://source.dussan.org/?a=commitdiff_plain;h=e8e21c7f8ae635d159203627773287d399fad694;p=xmlgraphics-fop.git

Changing from Adobe 1st quadrant co-ordinates to Java page co-ordinates
(0,0 = right,top).  Chages references to CoordTransformer to
java.awt.geom.AffineTransform


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP_0-20-0_Alt-Design@197544 13f79535-47bb-0310-9956-ffa450edef68
---

diff --git a/src/java/org/apache/fop/area/AbstractReferenceArea.java b/src/java/org/apache/fop/area/AbstractReferenceArea.java
index fa3c995cc..085b8e10f 100644
--- a/src/java/org/apache/fop/area/AbstractReferenceArea.java
+++ b/src/java/org/apache/fop/area/AbstractReferenceArea.java
@@ -18,6 +18,8 @@
  */
 package org.apache.fop.area;
 
+import java.awt.geom.AffineTransform;
+
 import org.apache.fop.datastructs.Node;
 import org.apache.fop.fo.FONode;
 import org.apache.fop.fo.flow.FoPageSequence;
@@ -31,7 +33,7 @@ public abstract class AbstractReferenceArea
     implements ReferenceArea {
 
     // Set up as identity matrix
-    protected CoordTransformer transformer = new CoordTransformer();
+    protected AffineTransform transformer = new AffineTransform();
 
     /**
      * @param pageSeq through which this area was generated
@@ -57,7 +59,7 @@ public abstract class AbstractReferenceArea
      *
      * @param transformer to position this reference area
      */
-    public void setCoordTransformer(CoordTransformer transformer) {
+    public void setCoordTransformer(AffineTransform transformer) {
         synchronized (sync) {
             this.transformer = transformer;
         }
@@ -68,7 +70,7 @@ public abstract class AbstractReferenceArea
      *
      * @return the current transformer to position this reference area
      */
-    public CoordTransformer getCoordTransformer() {
+    public AffineTransform getCoordTransformer() {
         synchronized (sync) {
             return this.transformer;
         }
diff --git a/src/java/org/apache/fop/area/Area.java b/src/java/org/apache/fop/area/Area.java
index 53db56544..ce0f1c299 100644
--- a/src/java/org/apache/fop/area/Area.java
+++ b/src/java/org/apache/fop/area/Area.java
@@ -23,14 +23,6 @@ import org.apache.fop.datastructs.SyncedNode;
 import org.apache.fop.fo.FONode;
 import org.apache.fop.fo.flow.FoPageSequence;
 
-/**
- * @author pbw
- * @version $Revision$ $Name$
- */
-/**
- * @author pbw
- * @version $Revision$ $Name$
- */
 /**
  * The base class for all areas.  <code>Area</code> extends <code>Node</code>
  * because all areas will find themselves in a tree of some kind.
diff --git a/src/java/org/apache/fop/area/ReferenceArea.java b/src/java/org/apache/fop/area/ReferenceArea.java
index 6068dfa22..eb1afaf64 100644
--- a/src/java/org/apache/fop/area/ReferenceArea.java
+++ b/src/java/org/apache/fop/area/ReferenceArea.java
@@ -19,29 +19,44 @@
  */
 package org.apache.fop.area;
 
+import java.awt.geom.AffineTransform;
+
 /**
+ * Interface for <code>reference-area</code>s; i.e. areas which provide a
+ * context for possible changes in <code>writing-mode</code> or
+ * <code>reference-orientation</code>.
+ *  
  * @author pbw
  * @version $Revision$ $Name$
  */
 public interface ReferenceArea extends Cloneable {
 
     /**
-     * Set the Coordinate Transformation Matrix which transforms content
-     * coordinates in this reference area which are specified in
-     * terms of "start" and "before" into coordinates in a system which
-     * is positioned in "absolute" directions (with origin at lower left of
-     * the reference area.
+     * Java's text handling includes facilities for managing writing
+     * mode.  <code>java.awt.ComponentOrientation</code> handles the
+     * standard FO writing methods - LT (lr-tb), RT (rl-tb) and TR (tb-rl),
+     * as well as TL (tb-lr - e.g. Mongolian).
+     * Because these are dealt with within the context of a page-based
+     * co-ordinate system (left,top = 0,0, right,bottom = x,y), there is
+     * no need to apply any Affine transform to discriminate these cases.
+     * <p>When a <code>reference-orientation</code> is applied, however,
+     * and an area is rotated with reference to its containing area,
+     * such a transform must be applied.
+     * <p>Transforms will also be required to map Java page co-ordinates to
+     * Adobe 1st quadrant co-ordinates for PDF and Postscript rendering.
      *
-     * @param matrix the current transform to position this region
+     * @param matrix the transform to map the contents of this reference-area
+     * into statndard Java page co-ordinates. 
      */
-    public void setCoordTransformer(CoordTransformer matrix);
+    public void setCoordTransformer(AffineTransform matrix);
 
     /**
-     * Get the current transformer of this reference area.
+     * Get the transform mapping this reference area into standard page
+     * co-ordinates.  May return null.
      *
-     * @return the current transformer to position this reference area.
+     * @return the current transform of this reference area.
      */
-    public CoordTransformer getCoordTransformer();
+    public AffineTransform getCoordTransformer();
     
     public Object clone();