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Add a SVG Generator example
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‎src/examples/java/io/sf/carte/example/EchoSVGTest.java

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/*
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Copyright (c) 2017-2021, Carlos Amengual.
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SPDX-License-Identifier: BSD-3-Clause
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Copyright (c) 2017-2024, Carlos Amengual.
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Licensed under a BSD-style License. You can find the license here:
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https://css4j.github.io/LICENSE.txt
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*/
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/*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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package io.sf.carte.example;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import java.awt.Dimension;
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import java.awt.Font;
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import java.io.ByteArrayOutputStream;
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import java.io.CharArrayWriter;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.Reader;
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import java.nio.charset.StandardCharsets;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.parsers.ParserConfigurationException;
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import org.junit.jupiter.api.Test;
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import org.w3c.dom.Document;
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import org.w3c.dom.DocumentType;
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import org.w3c.dom.Element;
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import io.sf.carte.echosvg.anim.dom.SVGDOMImplementation;
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import io.sf.carte.echosvg.dom.util.SAXDocumentFactory;
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import io.sf.carte.echosvg.svggen.SVGGeneratorContext;
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import io.sf.carte.echosvg.svggen.SVGGeneratorContext.GraphicContextDefaults;
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import io.sf.carte.echosvg.svggen.SVGGraphics2D;
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import io.sf.carte.echosvg.transcoder.ErrorHandler;
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import io.sf.carte.echosvg.transcoder.TranscoderException;
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import io.sf.carte.echosvg.transcoder.TranscoderInput;
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*/
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public class EchoSVGTest {
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@Test
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public void testSVGGraphics2D() throws Exception {
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FontDecorationPainter painter = new FontDecorationPainter();
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SVGGraphics2D g2d = createSVGGraphics2D();
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// Set some appropriate dimension
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g2d.setSVGCanvasSize(new Dimension(300, 400));
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painter.paint(g2d);
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CharArrayWriter wri = new CharArrayWriter(1900);
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g2d.stream(wri);
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int len = wri.toCharArray().length;
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assertTrue(len > 1800, "Char array had length of only " + len + ".");
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}
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/**
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* Creates a <code>SVGGraphics2D</code> with certain defaults.
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*
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* @return the <code>SVGGraphics2D</code>.
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*/
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static SVGGraphics2D createSVGGraphics2D() {
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// We need a Document that holds an SVG root element.
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// First obtain a DocumentBuilder as a way to get it.
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DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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factory.setNamespaceAware(true);
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DocumentBuilder builder;
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try {
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builder = factory.newDocumentBuilder();
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} catch (ParserConfigurationException e) {
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throw new IllegalStateException(e);
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}
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// Now the document which is what is needed
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Document doc = builder.newDocument();
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// Create a SVG DTD
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DocumentType dtd = builder.getDOMImplementation().createDocumentType("svg",
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"-//W3C//DTD SVG 1.1//EN", "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd");
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// And the root element in the SVG namespace
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Element svgRoot = doc.createElementNS("http://www.w3.org/2000/svg", "svg");
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// Append those to the document
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doc.appendChild(dtd);
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doc.appendChild(svgRoot);
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/*
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* Now the document is ready: let's create some context objects and then the
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* SVGGraphics2D.
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*/
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// For simplicity, create a generator context with some defaults
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SVGGeneratorContext ctx = SVGGeneratorContext.createDefault(doc);
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// Set a comment to put in the SVG documents, overriding the default
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ctx.setComment("Generated by My Application");
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// Set a compression a bit higher than the default
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ctx.setCompressionLevel(6);
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// Create the context defaults, with a default font just in case
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GraphicContextDefaults defaults = new GraphicContextDefaults();
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defaults.setFont(new Font("Arial", Font.PLAIN, 12));
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// Set the defaults
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ctx.setGraphicContextDefaults(defaults);
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return new SVGGraphics2D(ctx, false);
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}
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@Test
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public void testTranscoding() throws Exception {
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org.w3c.dom.DOMImplementation impl = SVGDOMImplementation.getDOMImplementation();
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SAXDocumentFactory f = new SAXDocumentFactory(impl);
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Reader re = loadDocumentFromClasspath("/hdrbg.svg");
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org.w3c.dom.Document document = f.createDocument("https://css4j.github.io/imag/hdrbg.svg", re);
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org.w3c.dom.Document document = f.createDocument("https://css4j.github.io/imag/hdrbg.svg",
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re);
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PNGTranscoder trans = new PNGTranscoder();
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TranscoderInput input = new TranscoderInput(document);
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ByteArrayOutputStream ostream = new ByteArrayOutputStream(700);
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TranscoderOutput output = new TranscoderOutput(ostream);
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ErrorHandler handler = new ExceptionErrorHandler();
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trans.setErrorHandler(handler);
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String[] text = { "Copyright", "Copyright © 2024 ACME Inc.", "Description",
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"Header background", "Software", "EchoSVG" };
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String[] iText = { "Description", "en", "Description", "My image.", "Description", "es",
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"Descripción", "Mi imagen." };
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trans.addTranscodingHint(PNGTranscoder.KEY_KEYWORD_TEXT, text);
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trans.addTranscodingHint(PNGTranscoder.KEY_COMPRESSED_TEXT, text);
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trans.addTranscodingHint(PNGTranscoder.KEY_INTERNATIONAL_TEXT, iText);
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trans.addTranscodingHint(PNGTranscoder.KEY_COMPRESSION_LEVEL, 4);
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trans.transcode(input, output);
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assertTrue(ostream.size() > 400);
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assertTrue(ostream.size() > 1070, "Image had size of only " + ostream.size() + ".");
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}
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private Reader loadDocumentFromClasspath(String filename) {

‎src/examples/java/io/sf/carte/example/FontDecorationPainter.java

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/*
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Copyright (c) 2024, Carlos Amengual.
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Licensed under a BSD-style License. You can find the license here:
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https://css4j.github.io/LICENSE.txt
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*/
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/*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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package io.sf.carte.example;
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import java.awt.Color;
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import java.awt.Font;
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import java.awt.Graphics2D;
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import java.awt.RenderingHints;
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import java.awt.font.TextAttribute;
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import java.awt.geom.Rectangle2D;
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import java.awt.image.BufferedImage;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* Draw text with decoration attributes.
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*/
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public class FontDecorationPainter {
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public void paint(Graphics2D g) {
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// Set anti-aliasing
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g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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// Set a background color
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Color backgroundColor = new Color(0x08081a);
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g.setBackground(backgroundColor);
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// Set default font
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g.setFont(new Font("Arial", Font.BOLD, 12));
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// Create a font with the desired attributes, including STRIKETHROUGH
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Map<TextAttribute, Object> attributes = new HashMap<>();
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attributes.put(TextAttribute.FAMILY, "Helvetica");
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attributes.put(TextAttribute.WEIGHT, TextAttribute.WEIGHT_EXTRABOLD);
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attributes.put(TextAttribute.SIZE, 20);
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attributes.put(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON);
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Font fontST = new Font(attributes);
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// A similar font but with UNDERLINE instead of STRIKETHROUGH
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Map<TextAttribute, Object> attributes2 = new HashMap<>(attributes);
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attributes2.remove(TextAttribute.STRIKETHROUGH);
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attributes2.put(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON);
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Font fontUL = new Font(attributes2);
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// Set the STRIKETHROUGH font and a color
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g.setFont(fontST);
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g.setPaint(new Color(0x666699));
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// Draw a string
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g.drawString("Strike Through", 10, 40);
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// Embed an image
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BufferedImage image = createImage();
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g.drawImage(image, 25, 60, new Color(0xcccccc), null);
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// Now draw with a different color and the UNDERLINE font
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g.setPaint(Color.black);
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g.setFont(fontUL);
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g.translate(0, 30);
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// Draw a new string
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g.drawString("Underline", 10, 70);
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}
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private static BufferedImage createImage() {
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// Create an Image
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BufferedImage image = new BufferedImage(100, 75, BufferedImage.TYPE_INT_ARGB);
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Graphics2D ig = image.createGraphics();
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ig.scale(.5, .5);
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ig.setPaint(new Color(128, 0, 0));
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ig.fillRect(0, 0, 100, 50);
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ig.setPaint(Color.orange);
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ig.fillRect(100, 0, 100, 50);
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ig.setPaint(Color.yellow);
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ig.fillRect(0, 50, 100, 50);
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ig.setPaint(Color.red);
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ig.fillRect(100, 50, 100, 50);
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ig.setPaint(new Color(255, 127, 127));
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ig.fillRect(0, 100, 100, 50);
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ig.setPaint(Color.black);
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ig.draw(new Rectangle2D.Double(0.5, 0.5, 199, 149));
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ig.dispose();
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return image;
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}
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}

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