Line breaking example from J2SDK - NOT PART OF FOP

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP_0-20-0_Alt-Design@197649 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/render/awt/LineBreakSample.java

@@ -0,0 +1,140 @@
+package org.apache.fop.render.awt;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.font.FontRenderContext;
+import java.awt.font.LineBreakMeasurer;
+import java.awt.font.TextLayout;
+import java.util.Hashtable;
+import java.text.AttributedCharacterIterator;
+import java.text.AttributedString;
+import java.awt.font.TextAttribute;
+import java.awt.event.WindowAdapter;
+import java.awt.event.WindowEvent; 
+
+/**
+ * This class demonstrates how to line-break and draw a paragraph 
+ * of text using LineBreakMeasurer and TextLayout.
+ *
+ * This class constructs a LineBreakMeasurer from an
+ * AttributedCharacterIterator.  It uses the LineBreakMeasurer
+ * to create and draw TextLayouts (lines of text) which fit within 
+ * the Component's width.
+ */
+
+public class LineBreakSample extends JApplet {
+
+    // The LineBreakMeasurer used to line-break the paragraph.
+    private LineBreakMeasurer lineMeasurer;
+
+    // The index in the LineBreakMeasurer of the first character
+    // in the paragraph.
+    private int paragraphStart;
+
+    // The index in the LineBreakMeasurer of the first character
+    // after the end of the paragraph.
+    private int paragraphEnd;
+
+    private static final Hashtable map = new Hashtable();
+    static {
+        map.put(TextAttribute.FAMILY, "Utopia");
+        map.put(TextAttribute.POSTURE, TextAttribute.POSTURE_OBLIQUE);
+        map.put(TextAttribute.WIDTH, TextAttribute.WIDTH_CONDENSED);
+        map.put(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD);
+        map.put(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_LOW_ONE_PIXEL);
+        map.put(TextAttribute.FOREGROUND, Color.red);
+        map.put(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON);
+        map.put(TextAttribute.SIZE, new Float(18.0));
+    }  
+
+    private static AttributedString vanGogh = new AttributedString(
+        "Many people believe that Vincent van Gogh painted his best works " +
+        "during the two-year period he spent in Provence. Here is where he " +
+        "painted The Starry Night--which some consider to be his greatest " +
+        "work of all. However, as his artistic brilliance reached new heights " +
+        "in Provence, his physical and mental health plummeted. ", map);
+                                
+    public void init() {
+	buildUI(getContentPane());
+    }
+
+    public void buildUI(Container container){
+        LineBreakPanel lineBreakPanel = new LineBreakPanel();
+	container.add(lineBreakPanel, BorderLayout.CENTER);
+    }
+            
+    class LineBreakPanel extends JPanel {
+
+      public LineBreakPanel() {
+          //setFont(Font.decode("utopia-plain-14"));
+          AttributedCharacterIterator paragraph = vanGogh.getIterator();
+          paragraphStart = paragraph.getBeginIndex();
+          paragraphEnd = paragraph.getEndIndex();
+
+          // Create a new LineBreakMeasurer from the paragraph.
+          lineMeasurer = new LineBreakMeasurer(paragraph, 
+                                new FontRenderContext(null, true, true));
+      }
+
+      public void paintComponent(Graphics g) {
+
+	super.paintComponent(g);
+        setBackground(Color.white);
+
+        Graphics2D graphics2D = (Graphics2D) g;
+
+        // Set formatting width to width of Component.
+	Dimension size = getSize();
+        float formatWidth = (float) size.width;
+
+        float drawPosY = 0;
+
+        lineMeasurer.setPosition(paragraphStart);
+
+        // Get lines from lineMeasurer until the entire
+        // paragraph has been displayed.
+        while (lineMeasurer.getPosition() < paragraphEnd) {
+
+            // Retrieve next layout.
+            TextLayout layout = lineMeasurer.nextLayout(formatWidth);
+            // Move y-coordinate by the ascent of the layout.
+            drawPosY += layout.getAscent();
+
+            // Compute pen x position.  If the paragraph is 
+            // right-to-left, we want to align the TextLayouts
+            // to the right edge of the panel.
+            float drawPosX;
+            if (layout.isLeftToRight()) {
+                drawPosX = 0;
+            }
+            else {
+                drawPosX = formatWidth - layout.getAdvance();
+            }
+
+            // Draw the TextLayout at (drawPosX, drawPosY).
+            layout.draw(graphics2D, drawPosX, drawPosY);
+
+            // Move y-coordinate in preparation for next layout.
+            drawPosY += layout.getDescent() + layout.getLeading();
+        }
+
+      }
+    }
+
+    public static void main(String[] args) {
+
+        JFrame f = new JFrame("HitTestSample");
+            
+        f.addWindowListener(new WindowAdapter(){
+                public void windowClosing(WindowEvent e) {
+                    System.exit(0);
+                }
+            });
+
+        LineBreakSample controller = new LineBreakSample();
+	controller.buildUI(f.getContentPane());        
+        f.setSize(new Dimension(400, 250));
+        f.setVisible(true);
+    }
+
+}