GradientPaint不使用itextPdf

Question

我使用的是itextPdf的最后一个版本。所有的过去都很好，，我不知道它什么时候开始出问题了。

我有这个方法来转换成pdf一个GraphePinScene对象。

public void toPdf(Scene scene, float clipWidth, float clipHeight, String path) 
{
    float pageWidth = (float) scene.getView().getWidth();
    float pageHeight = (float) scene.getView().getHeight();

    double xScale = 1.0;
    double yScale = 1.0;
     Document d = new Document();
        PdfWriter writer = PdfWriter.getInstance(d, new FileOutputStream(new File(path)));
        d.open();
        PdfContentByte cb = writer.getDirectContent();

        //scaling
        if (pageWidth > PDF_MAX_WIDTH) {
            xScale = (double) (pageWidth / PDF_MAX_WIDTH);
            pageWidth = PDF_MAX_WIDTH;
        }
        if (pageHeight > PDF_MAX_HEIGHT) {
            xScale = (double) (pageHeight / PDF_MAX_HEIGHT);
            pageHeight = PDF_MAX_HEIGHT;
        }

        Graphics2D g2d = new PdfGraphics2D(cb, pageWidth + clipWidth, pageHeight + clipHeight);
        g2d.scale(xScale, yScale);
        scene.paint(g2d);

        g2d.dispose();
        d.close();
}

场景对象包含一些小部件。所有小部件都包含在pdf中，只有用GradientPaint创建的小部件没有在pdf文件中显示，这是其中一个小部件：

public final class SecondaryStationWidget extends IconNodeWidget {

    //Staff

    @Override
    protected void paintWidget() {
        Graphics2D g = getGraphics();
        RenderingHints rh = new RenderingHints(
                RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        rh.put(RenderingHints.KEY_RENDERING,
                RenderingHints.VALUE_RENDER_QUALITY);
        g.setRenderingHints(rh);
            g.setPaint(new GradientPaint(44, 29, new Color(154, 191, 239), 88, 58, new Color(17, 74, 148), true));
            g.fill(new RoundRectangle2D.Double(1, 2,
                    88,
                    58,
                    10, 10));

    }
}

Answer 1

通过更改(强制)这些小部件的背景(在构造函数中)来解决问题。

setBackground(new Color(0, 0, 0, 1)); //Remove
setBackground(Color.WHITE);  //Add