REPORT-10262 html大文本精确分页

fine-itext/src/com/fr/third/v2/lowagie/text/pdf/PdfFont.java

@@ -55,6 +55,8 @@ import com.fr.third.v2.lowagie.text.Image;
 import sun.font.FontDesignMetrics;
 
 import java.awt.FontMetrics;
+import java.awt.font.FontRenderContext;
+import java.awt.geom.AffineTransform;
 
 /**
  * <CODE>PdfFont</CODE> is the Pdf Font object.
@@ -72,6 +74,7 @@ import java.awt.FontMetrics;
  */
 
 public class PdfFont implements Comparable {
+    private static final int ONE_THOUSAND = 1000 ;
 
     private Font oriFont;
 
@@ -166,9 +169,15 @@ public class PdfFont implements Comparable {
     }
 
     float width(String s) {
-        FontMetrics metrics = FontDesignMetrics.getMetrics(getAwtFont());
+        java.awt.Font font = this.getAwtFont();
+        float scale = ONE_THOUSAND / font.getSize2D();
+        java.awt.Font derivedFont = font.deriveFont(AffineTransform.getScaleInstance(scale, scale));
+        double width = derivedFont.getStringBounds(s,  new FontRenderContext(new AffineTransform(), true, true)).getWidth();
+        if (derivedFont.isTransformed()){
+            width /= scale;
+        }
         if (image == null)
-            return metrics.stringWidth(s) * hScale;
+            return (float) width * hScale;
         else
             return image.getScaledWidth();
     }