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问题:
By following the example provided at http://poi.apache.org/slideshow/how-to-shapes.html i got the conversion to work.
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(); }
However the generated images are very small. How do increase the size of the image output?
回答1:
You need to resize the graphics context and add a general transformation.
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(); }
