8004821: Graphics2D.drawPolygon() fails with IllegalPathStateException

Reviewed-by: prr, flar

src/share/classes/sun/java2d/pipe/PixelToShapeConverter.java

 /*
- * Copyright (c) 1997, 1998, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -103,13 +103,13 @@ public class PixelToShapeConverter
         GeneralPath gp = new GeneralPath(GeneralPath.WIND_EVEN_ODD);
         if (nPoints > 0) {
             gp.moveTo(xPoints[0], yPoints[0]);
-        }
             for (int i = 1; i < nPoints; i++) {
                 gp.lineTo(xPoints[i], yPoints[i]);
             }
             if (close) {
                 gp.closePath();
             }
+        }
         return gp;
     }
 

test/sun/java2d/pipe/Test8004821.java

+/*
+ * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+import java.awt.Graphics2D;
+import java.awt.Polygon;
+import java.awt.image.BufferedImage;
+
+/**
+ * @test
+ * @bug 8004821
+ * @summary Verifies that drawPolygon() works with empty arrays.
+ * @author Sergey Bylokhov
+ */
+public final class Test8004821 {
+
+    public static void main(final String[] args) {
+        final int[] arrEmpty = {};
+        final int[] arr1elem = {150};
+        final BufferedImage bi = new BufferedImage(300, 300,
+                                                   BufferedImage.TYPE_INT_RGB);
+        final Graphics2D g = (Graphics2D) bi.getGraphics();
+        test(g, arrEmpty);
+        test(g, arr1elem);
+        g.translate(2.0, 2.0);
+        test(g, arrEmpty);
+        test(g, arr1elem);
+        g.scale(2.0, 2.0);
+        test(g, arrEmpty);
+        test(g, arr1elem);
+        g.dispose();
+    }
+
+    private static void test(final Graphics2D g, final int[] arr) {
+        g.drawPolygon(arr, arr, arr.length);
+        g.drawPolygon(new Polygon(arr, arr, arr.length));
+        g.fillPolygon(arr, arr, arr.length);
+        g.fillPolygon(new Polygon(arr, arr, arr.length));
+        g.drawPolyline(arr, arr, arr.length);
+    }
+}