按照在所提供的例子http://poi.apache.org/slideshow/how-to-shapes.html我开始工作的转换。
FileInputStream is = new FileInputStream("slideshow.ppt");
SlideShow ppt = new SlideShow(is);
is.close();
Dimension pgsize = ppt.getPageSize();
Slide[] slide = ppt.getSlides();
for (int i = 0; i < slide.length; i++){
BufferedImage img = new BufferedImage(pgsize.width, pgsize.height, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics = img.createGraphics();
graphics.setPaint(Color.white);
graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
slide[i].draw(graphics);
FileOutputStream out = new FileOutputStream("slide-" + (i+1) + ".png");
javax.imageio.ImageIO.write(img, "png", out);
out.close();
}
然而,生成的图像是非常小的。 如何提高图像输出的大小?
您必须重新调整图形上下文,并添加一般的转变。
FileInputStream is = new FileInputStream("slideshow.pptx");
SlideShow ppt = new SlideShow(is);
is.close();
double zoom = 2; // magnify it by 2
AffineTransform at = new AffineTransform();
at.setToScale(zoom, zoom);
Dimension pgsize = ppt.getPageSize();
Slide[] slide = ppt.getSlides();
for (int i = 0; i < slide.length; i++) {
BufferedImage img = new BufferedImage((int)Math.ceil(pgsize.width*zoom), (int)Math.ceil(pgsize.height*zoom), BufferedImage.TYPE_INT_RGB);
Graphics2D graphics = img.createGraphics();
graphics.setTransform(at);
graphics.setPaint(Color.white);
graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
slide[i].draw(graphics);
FileOutputStream out = new FileOutputStream("slide-" + (i + 1) + ".png");
javax.imageio.ImageIO.write(img, "png", out);
out.close();
}