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https://issues.apache.org/jira/browse/PDFBOX-3359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15302981#comment-15302981
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Ivan Ridao Freitas commented on PDFBOX-3359:
--------------------------------------------
I end up using this code to simulate a PDF preview with the current version
(2.0.1):
{code}
@Override
public void paintComponent(Graphics g) {
Graphics2D graphics = (Graphics2D) g.create();
bufferedImage = new BufferedImage(scaledWidth, scaledHeight,
BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = bufferedImage.createGraphics();
g2.addRenderingHints(hints);
g2.setColor(Color.WHITE);
g2.fillRect(0, 0, scaledWidth, scaledHeight);
g2.scale(scaleX, scaleY);
g2.clip(imageableArea);
try {
g2.setBackground(Color.WHITE);
// Margins
g2.translate(imageableArea.getX(),
imageableArea.getY());
renderer.renderPageToGraphics(pageNumber, graphics);
} catch(Exception e) {
e.printStackTrace();
}
g2.dispose();
graphics.drawImage(bufferedImage, null, 0, 0);
graphics.dispose();
}
{code}
I make the scaling before PDFBox rendering. I had to set
g2.setBackground(Color.WHITE); since the background is black by default (I
don't know if that is the expected behaviour for PDFBox). I also use a cache
and only re generate bufferedImage if the scale was changed, but I removed that
from the example code.
> Drawing to Graphics2D / ScratchFileBuffer not closed
> ----------------------------------------------------
>
> Key: PDFBOX-3359
> URL: https://issues.apache.org/jira/browse/PDFBOX-3359
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.1
> Reporter: Ivan Ridao Freitas
>
> First, there is a little bug on PDFRenderer.renderPageToGraphics(int
> pageIndex, Graphics2D graphics, float scale) when using scale != 1 the call
> to clearRect() fills the original size with white background, but it should
> fill the scaled size.
> Second, I implemented a JPanel which is painted using that function and on
> every paint this message goes to the console:
> "DEBUG ScratchFileBuffer:516 - ScratchFileBuffer not closed!". Here is the
> code to test it, run it and *resize the JFrame*:
> {code:title=PanelTest.java|borderStyle=solid}
> import java.awt.Dimension;
> import java.awt.Graphics;
> import java.awt.Graphics2D;
> import java.io.File;
> import java.io.IOException;
> import javax.swing.JFrame;
> import javax.swing.JPanel;
> import javax.swing.SwingUtilities;
> import javax.swing.WindowConstants;
> import org.apache.pdfbox.pdmodel.PDDocument;
> import org.apache.pdfbox.rendering.PDFRenderer;
> public class PanelTest {
>
> private static JPanel getTestPanel() {
> PDDocument doc = null;
> try {
> doc = PDDocument.load(new File("anyfile.pdf"));
> } catch (IOException e) {
> e.printStackTrace();
> }
> final PDFRenderer renderer = new PDFRenderer(doc);
> JPanel panel = new JPanel() {
> @Override
> protected void paintComponent(Graphics g) {
> try {
> renderer.renderPageToGraphics(0, (Graphics2D) g, 0.5f);
> } catch (IOException e) {
> e.printStackTrace();
> }
> }
> };
> return panel;
> }
> public static void main(String[] args) throws Exception {
> SwingUtilities.invokeLater(new Runnable() {
> @Override
> public void run() {
> JFrame frame = new JFrame();
> frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
> frame.add(getTestPanel());
> frame.pack();
> frame.setSize(600, 400);
> Dimension paneSize = frame.getSize();
> Dimension screenSize = frame.getToolkit().getScreenSize();
> frame.setLocation((screenSize.width - paneSize.width) / 2,
> (screenSize.height - paneSize.height) / 2);
> frame.setTitle("Test");
> frame.setVisible(true);
> }
> });
> }
> }
> {code}
> Ivan
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