Question

我正在使用PowerPointPresentation（.ppt）将.ppt文件转换为ANDROID PLATFORM中的.png图像。为了实现这一点，我使用Apache Poi Api。在slide class中，有一个方法draw(java.awt.Graphics2D graphics)，其中传递的参数为Graphics2D。但在Android中，此类不受支持，而是使用canvas。我的问题是这个，这就是Android的任何等效draw(java.awt.Graphics2D graphics)方法，因为在否定的情况下我必须重写Api。所以在这里给我这个代码的最佳建议

public final class PPT2PNG {

public static void main(String args[]) throws Exception {

    File file = new File("C:/Users/THIYAGARAJAN/Desktop/ppt52.ppt");
    int scale = 10;
    int slidenum = 0;

    FileInputStream is = new FileInputStream(file);
    SlideShow ppt = new SlideShow(is);
    is.close();

    Dimension pgsize = ppt.getPageSize();
    int width = (int) (pgsize.width * scale);
    int height = (int) (pgsize.height * scale);
    System.out.println("w" + width + "h" + height);

    Slide[] slide = ppt.getSlides();
    System.out.println(slide.length);
    for (int i = 0; i < slide.length; i++) {
        String title = slide[i].getTitle();
        System.out.println("Rendering slide " + slide[i].getSlideNumber() + (title == null ? "" : ": " + title));

        BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics = img.createGraphics();
        graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        graphics.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        graphics.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);

        graphics.setPaint(Color.white);
        graphics.fill(new Rectangle2D.Float(0, 0, width, height));

        graphics.scale((double) width / pgsize.width, (double) height / pgsize.height);

        slide[i].draw(graphics);

        //String fname = file.getAbsolutePath() .replaceAll(".ppt", "-" + (i+1) + ".png");
        File fname = new File("C:/Users/THIYAGARAJAN/Desktop/" + i + ".png");
        FileOutputStream out = new FileOutputStream(fname);
        ImageIO.write(img, "png", out);
        out.close();
    }
}

private static void usage() {
    System.out.println("Usage: PPT2PNG [-scale <scale> -slide <num>] ppt");
}

}

Answer 1

Android有Canvas类，它与java的Graphics2D非常相似。看看这个link.

（如果我理解正确的话）

什么是android中的draw（java.awt.Graphics2D graphics）方法？

1 个答案: