JavaFX如何将WritableImage转换为Image

转载自  JavaFX如何将WritableImage转换为Image

我正在做一些应用程序,制作截图LineChart并将其保存为pdf,所以我不知道将WritableImage(JavaFX 2.2)转换为Image(iText lib)的平滑方式。

临时解决方案是

  • 然后,制作快照
  • 获得WritableImage从该快照
  • 将图像写入png文件
  • 打开图像并制作iText对象 Image

我想做一些更改:我不想将png文件写入光盘,我只想将快照写入pdf

 WritableImage wim = new WritableImage((int) lineChart.getWidth(),(int) lineChart.getHeight());
 Scene scena = primaryStage.getScene();
 scena.snapshot(wim);

 File fileA = new File("C://Graphs/chart.png");
 try {
      ImageIO.write(SwingFXUtils.fromFXImage(wim, null), "png", fileA);
 }
 catch (Exception s) {
 }
 pdfDocument.add(preface3);
 com.itextpdf.text.Image graph =com.itextpdf.text.Image.getInstance("C://Graphs/chart.png");
 pdfDocument.add((com.itextpdf.text.Element) graph); 

用途:

ByteArrayOutputStream  byteOutput = new ByteArrayOutputStream();

ImageIO.write( SwingFXUtils.fromFXImage( wim, null ), "png", byteOutput );

com.itextpdf.text.Image  graph;
graph = com.itextpdf.text.Image.getInstance( byteOutput.toByteArray() );

从画布中复制绘图,将复制到WritableImage,而不是从WritableImage获得图像

        WritableImage wi = new WritableImage((int)gc.getCanvas().getWidth(), 
                (int)gc.getCanvas().getHeight());
        gc.getCanvas().snapshot(null, wi); //Coping all that now in Canvas
        //gc is GraphicContext object from Canvas, it has drawing functions
        BufferedImage bi =SwingFXUtils.fromFXImage((Image)wi, null); 
        SwingFXUtils.toFXImage(bi, (WritableImage)image);

 

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