Support hyperlinks, issue #24

net.sourceforge.plantuml.eclipse/src/net/sourceforge/plantuml/eclipse/utils/Diagram.java

@@ -4,17 +4,22 @@
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Collection;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.swt.graphics.ImageData;
+import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.ui.IEditorInput;
 import org.eclipse.ui.IEditorPart;
 import org.eclipse.ui.IPathEditorInput;
 import org.eclipse.ui.IWorkbenchPage;
 
+import net.sourceforge.plantuml.FileFormat;
+import net.sourceforge.plantuml.FileFormatOption;
 import net.sourceforge.plantuml.FileSystem;
 import net.sourceforge.plantuml.OptionFlags;
 import net.sourceforge.plantuml.SourceStringReader;
@@ -46,6 +51,11 @@ public class Diagram {
 	 */
 	private ImageData imageData;
 
+	/**
+	 * Layout data for diagram elements
+	 */
+	private Collection<LinkData> links = null;
+
 	/**
 	 * Create a diagram
 	 * 
@@ -84,7 +94,8 @@ public ImageData getImage(IPath path) throws IOException {
 			}
 			OptionFlags.getInstance().setQuiet(true);
 
-			imageData = getImage(textDiagram, imageNumber);
+			links = new ArrayList<LinkData>();
+			imageData = getImage(textDiagram, imageNumber, links);
 		}
 		return getImageData();
 	}
@@ -109,10 +120,12 @@ private static void setGraphvizPath() {
 	 * @return ImageData
 	 */
 	public static ImageData getImage(String textDiagram) {
-		return getImage(textDiagram, 0);
+		return getImage(textDiagram, 0, null);
 	}
 
-	private static ImageData getImage(String textDiagram, int imageNum) {
+	private static FileFormatOption layoutFormatOption = new FileFormatOption(FileFormat.PNG);
+
+	private static ImageData getImage(String textDiagram, int imageNum, Collection<LinkData> links) {
 		setGraphvizPath();
 
 		ImageData imageData = null;
@@ -122,6 +135,12 @@ private static ImageData getImage(String textDiagram, int imageNum) {
 			// image generation.
 			SourceStringReader reader = new SourceStringReader(textDiagram);
 			String desc = reader.generateImage(os, imageNum);
+			if (links != null) {
+				String cMapData = reader.getCMapData(0, layoutFormatOption);
+				if (cMapData != null) {
+					parseImageMapString(cMapData, links);
+				}
+			}
 			os.flush();
 			os.close();
 
@@ -136,6 +155,75 @@ private static ImageData getImage(String textDiagram, int imageNum) {
 		return imageData;
 	}
 
+	private static void parseImageMapString(String cMapData, Collection<LinkData> links) {
+		String[] areaElements = cMapData.split(Pattern.quote("<area "));
+		for (String areaElement : areaElements) {
+//			int pos = areaElement.indexOf('>');
+//			if (pos >= 0) {
+//				areaElement = areaElement.substring(0, pos);
+//				if (areaElement.endsWith("/")) {
+//					areaElement = areaElement.substring(0, areaElement.length() - 1);
+//				}
+//			}
+			LinkData link = new LinkData();
+			link.href = getAttributeValue(areaElement, "href");
+			link.title = getAttributeValue(areaElement, "title");
+			link.altText = getAttributeValue(areaElement, "alt");
+			String coords = getAttributeValue(areaElement, "coords");
+			if (coords != null) {
+				String[] ints = coords.split(",");
+				if (ints.length == 4) {
+					try {
+						int x1 = Integer.valueOf(ints[0]), y1 = Integer.valueOf(ints[1]), x2 = Integer.valueOf(ints[2]), y2 = Integer.valueOf(ints[3]);
+						link.rect = new Rectangle(x1, y1, x2 - x1, y2 - y1);
+					} catch (NumberFormatException e) {
+					}
+				}
+			}
+			links.add(link);
+		}
+	}
+	/*
+	    @startuml
+		actor Bob [[http://plantuml.com/sequence]]
+		actor "This is [[http://plantuml.com/sequence Alice]] actor" as Alice
+		Bob -> Alice [[http://plantuml.com/start]] : hello
+		note left [[http://plantuml.com/start]]
+		a note with a link
+		end note
+		Alice -> Bob : hello with [[http://plantuml.com/start{Tooltip for message} some link]]
+		note right [[http://plantuml.com/start]] : another note
+		note left of Bob
+		You can use [[http://plantuml.com/start links in notes]] also.
+		end note
+		@enduml
+
+		<map id="plantuml_map" name="plantuml_map">
+		<area shape="rect" id="id1" href="http://plantuml.com/sequence" title="http://plantuml.com/sequence" alt="" coords="375,221,408,238"/>
+		<area shape="rect" id="id2" href="http://plantuml.com/sequence" title="http://plantuml.com/sequence" alt="" coords="375,68,408,85"/>
+		<area shape="rect" id="id3" href="http://plantuml.com/start" title="Tooltip for message" alt="" coords="321,143,383,158"/>
+		<area shape="rect" id="id4" href="http://plantuml.com/start" title="http://plantuml.com/start" alt="" coords="94,183,180,199"/>
+		<area shape="rect" id="id5" href="http://plantuml.com/start" title="http://plantuml.com/start" alt="" coords="245,104,388,126"/>
+		<area shape="rect" id="id6" href="http://plantuml.com/start" title="http://plantuml.com/start" alt="" coords="99,101,229,126"/>
+		<area shape="rect" id="id7" href="http://plantuml.com/start" title="http://plantuml.com/start" alt="" coords="239,140,496,165"/>
+		<area shape="rect" id="id8" href="http://plantuml.com/sequence" title="http://plantuml.com/sequence" alt="" coords="222,5,248,257"/>
+		</map>
+	 */
+
+	private static String getAttributeValue(String element, String attributeName) {
+		String prefix = attributeName + "=\"";
+		int start = element.indexOf(prefix);
+		if (start >= 0) {
+			start += prefix.length();
+			String suffix = "\"";
+			int end = element.indexOf(suffix, start);
+			if (end > start) {
+				return element.substring(start, end);
+			}
+		}
+		return null;
+	}
+
 	public String extractTextDiagram(String diagramText) {
 		textDiagram = diagramText;
 		if (textDiagram == null) {
@@ -160,6 +248,10 @@ public ImageData getImageData() {
 		return imageData;
 	}
 
+	public Collection<LinkData> getLinks() {
+		return links;
+	}
+
 	/**
 	 * {@link String}
 	 */

net.sourceforge.plantuml.eclipse/src/net/sourceforge/plantuml/eclipse/utils/LinkData.java

@@ -0,0 +1,9 @@
+package net.sourceforge.plantuml.eclipse.utils;
+
+import org.eclipse.swt.graphics.Rectangle;
+
+public class LinkData {
+
+	public String href, title, altText;
+	public Rectangle rect;
+}

net.sourceforge.plantuml.eclipse/src/net/sourceforge/plantuml/eclipse/views/PlantUmlView.java

@@ -216,6 +216,7 @@ protected IStatus run(IProgressMonitor monitor) {
 								public void run() {
 									if (! canvas.isDisposed()) {
 										canvas.loadImage(imageData);
+										canvas.setLinks(diagram.getLinks());
 										lastTextDiagram = diagram.getTextDiagram();
 										lastImageNumber = diagram.getImageNumber();
 									}