PDFBOX-3353: make circles slightly smaller to avoid outside flatness in PDFBox rendering

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/trunk@1923664 13f79535-47bb-0310-9956-ffa450edef68

Author: THausherr

pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/annotation/handlers/PDTextAppearanceHandler.java

@@ -232,6 +232,10 @@ private void drawCircles(PDAnnotationText annotation, final PDAppearanceContentS
         float smallR = 6.36f;
         float largeR = 9.756f;
 
+        // adjustments because the bottom of the circle is flat
+        contentStream.transform(Matrix.getScaleInstance(0.95f, 0.95f));
+        contentStream.transform(Matrix.getTranslateInstance(0, 0.5f));
+
         contentStream.setMiterLimit(4);
         contentStream.setLineJoinStyle(1);
         contentStream.setLineCapStyle(0);