Java tutorial
package at.ac.dbisinformatik.snowprofile.web.svgcreator; /** * Copyright (c) 2012 Aleksandar Stojakovic * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * The Software shall be used for Good, not Evil. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * */ import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.net.URISyntaxException; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerException; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.apache.batik.dom.svg.SVGDOMImplementation; import org.apache.batik.transcoder.TranscoderException; import org.apache.batik.transcoder.TranscoderInput; import org.apache.batik.transcoder.TranscoderOutput; import org.apache.batik.transcoder.image.JPEGTranscoder; import org.apache.batik.transcoder.image.PNGTranscoder; import org.apache.commons.io.output.ByteArrayOutputStream; import org.apache.fop.svg.PDFTranscoder; import org.w3c.dom.DOMImplementation; import org.w3c.dom.Document; import org.w3c.dom.Element; import com.google.gson.JsonArray; import com.google.gson.JsonObject; public class SVGCreator { /** * returns a ByteArrayOutputStream which contains the converted SVG-Graph to PNG * * @param inputStream * @return * @throws TranscoderException * @throws IOException */ public static ByteArrayOutputStream createPNG(InputStream inputStream) throws TranscoderException, IOException { ByteArrayOutputStream ret = new ByteArrayOutputStream(); PNGTranscoder t = new PNGTranscoder(); TranscoderInput input = new TranscoderInput(inputStream); TranscoderOutput output = new TranscoderOutput(ret); t.transcode(input, output); return ret; } /** * returns a ByteArrayOutputStream which contains the converted SVG-Graph to JPG * * @param inputStream * @return * @throws TranscoderException * @throws IOException */ public static ByteArrayOutputStream createJPG(InputStream inputStream) throws TranscoderException, IOException { ByteArrayOutputStream ret = new ByteArrayOutputStream(); JPEGTranscoder t = new JPEGTranscoder(); t.addTranscodingHint(JPEGTranscoder.KEY_QUALITY, new Float(.8)); TranscoderInput input = new TranscoderInput(inputStream); TranscoderOutput output = new TranscoderOutput(ret); t.transcode(input, output); return ret; } /** * returns a ByteArrayOutputStream which contains the converted SVG-Graph to PDF * * @param inputStream * @return * @throws IOException */ public static ByteArrayOutputStream createPDF(InputStream inputStream) throws IOException { ByteArrayOutputStream ret = new ByteArrayOutputStream(); PDFTranscoder t = new PDFTranscoder(); TranscoderInput input = new TranscoderInput(inputStream); TranscoderOutput output = new TranscoderOutput(ret); try { t.transcode(input, output); } catch (Exception ex) { throw new IOException(ex.getMessage()); } finally { } return ret; } /** * creates a SVG-Graph for given jsonDocument which includes ExtJS-SVG-Objects. The created SVG-Document will be converted in the given export type. * * @param jsonDocument * @param exportType * @param profileID * @return * @throws TransformerException * @throws URISyntaxException * @throws TranscoderException * @throws IOException */ public static ByteArrayOutputStream svgDocument(JsonArray jsonDocument, String exportType, String profileID) throws TransformerException, URISyntaxException, TranscoderException, IOException { ByteArrayOutputStream ret = null; DOMImplementation impl = SVGDOMImplementation.getDOMImplementation(); String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI; Document doc = impl.createDocument(svgNS, "svg", null); // Get the root element (the 'svg' element). Element svgRoot = doc.getDocumentElement(); // Set the width and height attributes on the root 'svg' element. svgRoot.setAttributeNS(null, "width", "1500"); svgRoot.setAttributeNS(null, "height", "1500"); JsonArray items = jsonDocument; for (int i = 0; i < items.size(); ++i) { String type = items.get(i).getAsJsonObject().get("type").getAsString(); Element element = null; org.w3c.dom.Text test = null; String path = ""; String width = ""; String height = ""; String x = ""; String y = ""; String fill = ""; String text = ""; String font = ""; String fontFamily = ""; String fontSize = ""; String degrees = ""; String stroke = ""; String opacity = ""; String src = ""; switch (type) { case "rect": width = items.get(i).getAsJsonObject().get("width").getAsString(); height = items.get(i).getAsJsonObject().get("height").getAsString(); x = items.get(i).getAsJsonObject().get("x").getAsString(); y = items.get(i).getAsJsonObject().get("y").getAsString(); fill = items.get(i).getAsJsonObject().get("fill").getAsString(); stroke = items.get(i).getAsJsonObject().get("stroke").getAsString(); opacity = items.get(i).getAsJsonObject().get("opacity").getAsString(); // Create the rectangle. element = doc.createElementNS(svgNS, "rect"); element.setAttributeNS(null, "width", width); element.setAttributeNS(null, "height", height); element.setAttributeNS(null, "x", x); element.setAttributeNS(null, "y", y); element.setAttributeNS(null, "fill", fill); element.setAttributeNS(null, "stroke", stroke); element.setAttributeNS(null, "opacity", opacity); break; case "path": path = items.get(i).getAsJsonObject().get("path").getAsString(); fill = items.get(i).getAsJsonObject().get("fill").getAsString(); stroke = items.get(i).getAsJsonObject().get("stroke").getAsString(); // Create the path. element = doc.createElementNS(svgNS, "path"); element.setAttributeNS(null, "d", path); element.setAttributeNS(null, "fill", fill); element.setAttributeNS(null, "stroke", stroke); break; case "image": x = items.get(i).getAsJsonObject().get("x").getAsString(); y = items.get(i).getAsJsonObject().get("y").getAsString(); width = items.get(i).getAsJsonObject().get("width").getAsString(); height = items.get(i).getAsJsonObject().get("height").getAsString(); src = System.class.getResource("/at/ac/dbisinformatik/snowprofile/web/resources/" + items.get(i).getAsJsonObject().get("src").getAsString()).toString(); // Create the path. element = doc.createElementNS(svgNS, "image"); element.setAttributeNS(null, "x", x); element.setAttributeNS(null, "y", y); element.setAttributeNS(null, "width", width); element.setAttributeNS(null, "height", height); element.setAttributeNS(null, "xlink:href", src); break; case "text": text = items.get(i).getAsJsonObject().get("text").getAsString(); fill = items.get(i).getAsJsonObject().get("fill").getAsString(); font = items.get(i).getAsJsonObject().get("font").getAsString(); x = items.get(i).getAsJsonObject().get("x").getAsString(); y = items.get(i).getAsJsonObject().get("y").getAsString(); // Transformation if (items.get(i).getAsJsonObject().get("rotate") != null) { JsonObject temp = items.get(i).getAsJsonObject().get("rotate").getAsJsonObject(); degrees = temp.get("degrees").getAsString(); } fontSize = font.split(" ")[0]; fontFamily = font.split(" ")[1]; // Create the text. test = doc.createTextNode(text); element = doc.createElementNS(svgNS, "text"); element.setAttributeNS(null, "text", text); element.setAttributeNS(null, "fill", fill); element.setAttributeNS(null, "font-family", fontFamily); element.setAttributeNS(null, "font-size", fontSize); element.setAttributeNS(null, "x", x); element.setAttributeNS(null, "y", y); if (!degrees.equals("")) { // element.setAttributeNS(null, "transform", // "rotate(270 "+500+","+80+")"); } element.appendChild(test); break; default: break; } // Attach the rectangle to the root 'svg' element. svgRoot.appendChild(element); } TransformerFactory tFactory = TransformerFactory.newInstance(); Transformer transformer = tFactory.newTransformer(); DOMSource source = new DOMSource(doc); ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); StreamResult result = new StreamResult(outputStream); transformer.transform(source, result); InputStream inputStream = new ByteArrayInputStream(outputStream.toByteArray()); switch (exportType) { case "png": ret = createPNG(inputStream); break; case "jpg": ret = createJPG(inputStream); break; case "pdf": ret = createPDF(inputStream); break; default: break; } return ret; } }