Save MapContent issue with latitude/longitude lines

Question

All labels for longitude lines at bottom and latitude lines on left and right of the map look fine when viewed in JFrame like the one used in https://docs.geotools.org/latest/userguide/tutorial/raster/image.html

File saved using saveImage function in https://docs.geotools.org/latest/userguide/library/render/gtrenderer.html

Using mapContent.getMaxBounds() as envelope to create and save the image. The green background filling of rectangle for Graphic2D image used to save in the file.
The same map seem to appear in both images attached, yet the labels at the bottom and on the right of the map (JFrame) are not included in the saved file.

How do I debug this issue?

I am not really familiar with this geographical representations although I am learning a bit.

Answer 1

I've had good results using this approach:

  public void drawMapToImage(File outputFile, String outputType) {
    JMapPane mapPane = frame.getMapPane();

    try (FileOutputStream fileOutputStream = new FileOutputStream(outputFile);
        ImageOutputStream outputImageFile = ImageIO.createImageOutputStream(fileOutputStream);) {
      RenderedImage bufferedImage = mapPane.getBaseImage();
      ImageIO.write(bufferedImage, outputType, outputImageFile);
    } catch (IOException ex) {
      ex.printStackTrace();
    }
  }