Remove rectangle drawing from rotated image (#896)

Author: tomas-sexenian

java/src/main/java/com/genexus/GxImageUtil.java

@@ -308,18 +308,23 @@ private static BufferedImage rotateImage(BufferedImage buffImage, double angle)
 		int width = buffImage.getWidth();
 		int height = buffImage.getHeight();
 
-		int nWidth = (int) Math.floor((double) width * cos + (double) height * sin);
-		int nHeight = (int) Math.floor((double) height * cos + (double) width * sin);
+		int nWidth = (int) Math.floor(width * cos + height * sin);
+		int nHeight = (int) Math.floor(height * cos + width * sin);
 
 		BufferedImage rotatedImage = new BufferedImage(nWidth, nHeight, BufferedImage.TYPE_INT_ARGB);
 
 		Graphics2D graphics = rotatedImage.createGraphics();
+
+		graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
+		graphics.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
+		graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+
 		AffineTransform at = new AffineTransform();
-		at.translate((nWidth - width) / 2, (nHeight - height) / 2);
-		at.rotate(radian, (double) (width / 2), (double) (height / 2));
+		at.translate((double) (nWidth - width) / 2, (double) (nHeight - height) / 2);
+		at.rotate(radian, width / 2.0, height / 2.0);
+
 		graphics.setTransform(at);
 		graphics.drawImage(buffImage, 0, 0, null);
-		graphics.drawRect(0, 0, nWidth - 1, nHeight - 1);
 		graphics.dispose();
 
 		return rotatedImage;