Insert image to excel file using JXL without stretching it

Question

I can insert image to my excel file using jxl using sheet.addImage(WritableImage obj) . My problem is that, it stretches based on the args of WritableImage . I'm wondering if there is a way so that the image that I insert will not stretch like if I insert a 200x200 sized image it will appear to the sheet as 200x200.

Answer 1

As much as this has bugged me about jxl, I've never found a way to insert an image without associating the aspect ratio to cells instead of pixels/inches/any standard unit of measurement, and I've done decent research in the past on doing so.

The best you can do is to adapt the images to the height/width of the cells you are inserting it into, or even better, set the cell width/height for the cells you are putting the image in.

From the JExcel FAQ- http://jexcelapi.sourceforge.net/resources/faq/

private static final double CELL_DEFAULT_HEIGHT = 17;
private static final double CELL_DEFAULT_WIDTH = 64;

File imageFile = new File(GIF_OR_JPG_IMAGE_FILE);
BufferedImage input = ImageIO.read(imageFile);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(input, "PNG", baos);
sheet.addImage(new WritableImage(1,1,input.getWidth() / CELL_DEFAULT_WIDTH,
    input.getHeight() / CELL_DEFAULT_HEIGHT,baos.toByteArray()));

To keep the aspect ratio, you'll also want to set the WritableImage to not re-size if the user changes the row height or column width. Do this with either of the below (your preference based on if you want the image anchor locked or to move with resizing):

WritableImage.MOVE_WITH_CELLS;
WritableImage.NO_MOVE_OR_SIZE_WITH_CELLS;

Answer 2

Actually, this is possible. Assume that the width of the picture that you want to include is 4000. Then you do the following:

CellView cv = excelSheetTemp.getColumnView(0);
//get the width of the column where you want to insert the picture
int width = forLogo.getSize();
//if the width is less than the size you want, set the column width to
//the width. This will ensure that your image does not shrink
if (width < 4000) {
    forLogo.setSize(4000);
    excelSheetTemp.setColumnView(0, cv);
    width = 4000;
}
double c = 4000/width;
WritableImage im = new WritableImage(0, 1, c, 3, the image file);
excelSheetTemp.addImage(im);