Supersedes AbstractReferenceArea as superclass for block-level reference-areas.

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP_0-20-0_Alt-Design@197818 13f79535-47bb-0310-9956-ffa450edef68

diff --git a/src/java/org/apache/fop/area/BlockReferenceArea.java b/src/java/org/apache/fop/area/BlockReferenceArea.java
new file mode 100644 (file)
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+++ b/src/java/org/apache/fop/area/BlockReferenceArea.java
@@ -0,0 +1,162 @@
+/*
+ *
+ * Copyright 2004 The Apache Software Foundation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Created on 12/07/2004
+ * $Id$
+ */
+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.expr.PropertyException;
+import org.apache.fop.fo.flow.FoPageSequence;
+import org.apache.fop.fo.properties.WritingMode;
+
+
+/**
+ * @author pbw
+ * @version $Revision$ $Name$
+ */
+public abstract class BlockReferenceArea extends BlockArea implements
+        ReferenceArea {
+
+    private static final String tag = "$Name$";
+    private static final String revision = "$Revision$";
+    /**
+     * @param pageSeq
+     * @param generatedBy
+     * @param parent
+     * @param sync
+     */
+    public BlockReferenceArea(FoPageSequence pageSeq, FONode generatedBy,
+            Node parent, Object sync) {
+        super(pageSeq, generatedBy, parent, sync);
+        // TODO Auto-generated constructor stub
+    }
+    /** The writing-mode of the parent of the generating FO.  This may
+     * differ from the writing mode of the generating FO if this is a
+     * <code>reference-area</code>. */
+    protected int frameWritingMode;
+    /** True if the <code>writing-mode</code> of the frames of this area is
+     * horizontal.  May differ from contentIsHorizontal if this is a
+     * <code>reference-area</code>. */
+    protected boolean frameIsHorizontal = true;
+    /** True if the the <code>writing-mode</code> of the frames of this area is
+     * left-to-right.  May differ from contentIsHorizontal if this is a
+     * <code>reference-area</code>. */
+    protected boolean frameLeftToRight = true;
+    /** The rotation trait for the framing rectangles of this area */
+    protected int frameRotation;
+    /** Rotation from content to frame.  One of 0, 90, 180, 270. */
+    protected int rotateToFrame;
+    /** Rotation from frame to content. One of 0, 90, 180, 270. */
+    protected int rotateToContent;
+
+    protected void setup() {
+        try {
+            frameWritingMode =
+                ((FONode)generatedBy.getParent()).getWritingMode();
+            frameIsHorizontal = WritingMode.isHorizontal(frameWritingMode);
+            frameLeftToRight = WritingMode.isLeftToRight(frameWritingMode);
+            frameRotation =
+                ((FONode)generatedBy.getParent()).getRefOrientation();
+        } catch (PropertyException e) {
+            throw new RuntimeException(e.getMessage());
+        }
+        rotateToFrame = frameRotation - contentRotation;
+        if (rotateToFrame == 0) {
+            rotateToContent = 0;
+        } else {
+            if (rotateToFrame < 0) {
+                rotateToContent = -rotateToFrame;
+                rotateToFrame +=360;
+            } else {
+                rotateToContent = 360 - rotateToFrame;
+            }
+        }
+        setupFrames();
+    }
+
+    public void setCoordTransformer(AffineTransform aftx) {
+        // Do nothing.  The co-ordinate transformer is gnerated dynamically
+        ;
+    }
+
+    /* (non-Javadoc)
+     * @see org.apache.fop.area.ReferenceArea#getCoordTransformer()
+     */
+    public AffineTransform getCoordTransformer() {
+        AffineTransform transform = null;
+        if (rotateToFrame == 0) {
+            return null;
+        }
+        ContentRectangle content = getContent();
+        // In general, x and y will be zero.  They DO NOT represent the
+        // offset from the frame(s) to the content.
+        double x = content.getX();
+        double y = content.getY();
+        double width = content.getWidth();
+        double height = content.getHeight();
+        switch (rotateToFrame) {
+        case 90:
+            // Translate the rotation back to the origin point of the contents
+            // Correct for the translation to the left of the origin point
+            // of what was the height.  No need to correct for what was the
+            // width, which has become the height.  Reverse any translation
+            // performed for the x,y values.
+            transform = AffineTransform.getTranslateInstance(x - height, y);
+            // Rotate around 0,0 by +90 degrees
+            transform.rotate(Math.PI * 0.5);
+            // Translate to a 0,0 origin point for the contents (generally
+            // unnecessary).
+            transform.translate(-x, -y);
+            return transform;
+        case 180:
+            // Translate the rotation back to the origin point of the contents
+            // Correct for the translation above the origin point of what was
+            // the height, and the translation to the left of the origin point
+            // of what was the width.  Reverse any translation
+            // performed for the x,y values.
+            transform =
+                AffineTransform.getTranslateInstance(x - width, y - height);
+            // Rotate around 0,0 by +180 degrees
+            transform.rotate(Math.PI);
+            // Translate to a 0,0 origin point for the contents (generally
+            // unnecessary).
+            transform.translate(-x, -y);
+            return transform;
+        case 270:
+            // Translate the rotation back to the origin point of the contents
+            // Correct for the translation above the origin point
+            // of what was the width.  No need to correct for what was the
+            // height, which has become the width.  Reverse any translation
+            // performed for the x,y values.
+            transform = AffineTransform.getTranslateInstance(x, y - width);
+            // Rotate around 0,0 by +90 degrees
+            transform.rotate(Math.PI * 1.5);
+            // Translate to a 0,0 origin point for the contents (generally
+            // unnecessary).
+            transform.translate(-x, -y);
+            return transform;
+        default:
+            throw new RuntimeException(
+                    "Invalid rotation specified: " + rotateToFrame);
+        }
+    }
+
+}