For #73 - Method to output a single page and runners for the builder.…

… [ci skip]

openhtmltopdf-java2d/src/main/java/com/openhtmltopdf/java2d/Java2DRenderer.java

@@ -63,6 +63,8 @@ public class Java2DRenderer implements IJava2DRenderer {
 
     private static final int DEFAULT_DOTS_PER_PIXEL = 1;
     private static final int DEFAULT_DPI = 72;
+
+    private final int _initialPageNo;
 
 	/**
 	 * Subject to change. Not public API. Used exclusively by the Java2DRendererBuilder class. 
@@ -79,10 +81,11 @@ public Java2DRenderer(
 			String replacementText,
 			boolean testMode,
 			FSPageProcessor pageProcessor,
-			Graphics2D layoutGraphics) {
+			Graphics2D layoutGraphics,
+			int initialPageNumber) {
 
 		_pageProcessor = pageProcessor;
-
+		_initialPageNo = initialPageNumber;		
 		_svgImpl = svgImpl;
 		_outputDevice = new Java2DOutputDevice(layoutGraphics);
 
@@ -276,11 +279,11 @@ private LayoutContext newLayoutContext() {
         return result;
     }
 
-    public void writePages(int initialPageNo) throws IOException {
+    public void writePages() throws IOException {
         List<PageBox> pages = _root.getLayer().getPages();
 
         RenderingContext c = newRenderingContext();
-        c.setInitialPageNo(initialPageNo);
+        c.setInitialPageNo(_initialPageNo);
 
         PageBox firstPage = pages.get(0);
         Rectangle2D firstPageSize = new Rectangle2D.Float(0, 0,
@@ -290,6 +293,41 @@ public void writePages(int initialPageNo) throws IOException {
         writePageImages(pages, c, firstPageSize);
     }
 
+    public void writePage(int zeroBasedPageNumber) throws IOException {
+    	List<PageBox> pages = _root.getLayer().getPages();
+
+    	if (zeroBasedPageNumber >= pages.size()) {
+    		throw new IndexOutOfBoundsException();
+    	}
+
+    	RenderingContext c = newRenderingContext();
+        c.setInitialPageNo(_initialPageNo);
+
+    	PageBox page = pages.get(zeroBasedPageNumber);
+
+        Rectangle2D pageSize = new Rectangle2D.Float(0, 0,
+                page.getWidth(c) / DEFAULT_DOTS_PER_PIXEL,
+                page.getHeight(c) / DEFAULT_DOTS_PER_PIXEL);
+
+        _outputDevice.setRoot(_root);
+
+        FSPage pg = _pageProcessor.createPage(zeroBasedPageNumber, (int) pageSize.getWidth(), (int) pageSize.getHeight());
+
+        _outputDevice.initializePage(pg.getGraphics());
+        _root.getLayer().assignPagePaintingPositions(c, Layer.PAGED_MODE_PRINT);
+
+        c.setPageCount(pages.size());
+        c.setPage(zeroBasedPageNumber, page);
+        paintPage(c, page);
+        _pageProcessor.finishPage(pg);
+
+        _outputDevice.finish(c, _root);
+    }
+
+    public int getPageCount() {
+    	return _root.getLayer().getPages().size();
+    }
+
     private void writePageImages(List<PageBox> pages, RenderingContext c, Rectangle2D firstPageSize) throws IOException {
         _outputDevice.setRoot(_root);
 

openhtmltopdf-java2d/src/main/java/com/openhtmltopdf/java2d/api/Java2DRendererBuilder.java

@@ -14,6 +14,7 @@
 
 import java.awt.Graphics2D;
 import java.io.File;
+import java.io.IOException;
 import java.io.InputStream;
 import java.util.ArrayList;
 import java.util.List;
@@ -47,6 +48,7 @@ public class Java2DRendererBuilder {
     private File _file;
     private boolean _testMode = false;
     private Graphics2D _layoutGraphics;
+    private int _initialPageNumber;
 
     public static enum TextDirection { RTL, LTR; }
     public static enum PageSizeUnits { MM, INCHES }
@@ -327,6 +329,16 @@ public Java2DRendererBuilder useDefaultPageSize(float pageWidth, float pageHeigh
         this._isPageSizeInches = (units == PageSizeUnits.INCHES);
         return this;
     }
+
+    /**
+     * Used to set an initial page number for use with page counters, etc.
+     * @param pageNumberInitial
+     * @return
+     */
+    public Java2DRendererBuilder useInitialPageNumber(int pageNumberInitial) {
+    	this._initialPageNumber = pageNumberInitial;
+    	return this;
+    }
 
 	/**
 	 * Output the document in paged format. The user can use the DefaultPageProcessor or use its source
@@ -339,6 +351,32 @@ public Java2DRendererBuilder toPageProcessor(FSPageProcessor pageProcessor) {
 		return this;
 	}
 
+	/**
+	 * <code>useLayoutGraphics</code> and <code>toPageProcessor</code> MUST have been called.
+	 * Also a document MUST have been set with one of the with* methods.
+	 * This will build the renderer and output each page of the document to the specified page 
+	 * processor.
+	 * @throws Exception
+	 */
+	public void runPaged() throws Exception {
+		Java2DRenderer renderer = this.buildJava2DRenderer();
+		renderer.layout();
+		renderer.writePages();
+	}
+
+	/**
+	 * <code>useLayoutGraphics</code> and <code>toPageProcessor</code> MUST have been called.
+	 * Also a document MUST have been set with one of the with* methods.
+	 * This will build the renderer and output the first page of the document to the specified page 
+	 * processor.
+	 * @throws Exception
+	 */
+	public void runFirstPage() throws Exception {
+		Java2DRenderer renderer = this.buildJava2DRenderer();
+		renderer.layout();
+		renderer.writePage(0);
+	}
+
 	public Java2DRenderer buildJava2DRenderer() {
         UnicodeImplementation unicode = new UnicodeImplementation(_reorderer, _splitter, _lineBreaker, 
                 _unicodeToLowerTransformer, _unicodeToUpperTransformer, _unicodeToTitleTransformer, _textDirection, _charBreaker);
@@ -347,7 +385,7 @@ public Java2DRenderer buildJava2DRenderer() {
 
         BaseDocument doc = new BaseDocument(_baseUri, _html, _document, _file, _uri);
 
-        return new Java2DRenderer(doc, unicode, _httpStreamFactory, _resolver, _cache, _svgImpl, pageSize, _replacementText, _testMode, _pageProcessor, _layoutGraphics);
+        return new Java2DRenderer(doc, unicode, _httpStreamFactory, _resolver, _cache, _svgImpl, pageSize, _replacementText, _testMode, _pageProcessor, _layoutGraphics, _initialPageNumber);
     }
 
 	public static abstract class Graphics2DPaintingReplacedElement extends EmptyReplacedElement {