for( FeatureTypeStyleWrapper featureTypeStyleWrapper : featureTypeStylesWrapperList ) {
List<RuleWrapper> rulesWrapperList = featureTypeStyleWrapper.getRulesWrapperList();
BufferedImage tmpImage = Utilities.rulesWrapperToImage(rulesWrapperList, PREVIEWWIDTH, PREVIEWHEIGHT, type);
Image convertToSWTImage = AWTSWTImageUtils.convertToSWTImage(tmpImage);
gc.drawImage(convertToSWTImage, 0, 0);
convertToSWTImage.dispose();
}
gc.dispose();
previewCanvas.redraw();
}