Some jpg files will not display in a ShapeNode. This does not seem to be a function of the file size. Is there any attribute of a jpg file that will stop the image from displaying?


My code looks like this...
       
        internal static Bitmap ScaleImage(string pathname, int maxWidth, int maxHeight)
        {
            // See: https://stackoverflow.com/questions/6501797/resize-image-proportionally-with-max
height-and-maxwidth-constraints

            try
            {
                var bitmap = new Bitmap(pathname);

                var ratioX = (double)maxWidth / bitmap.Width;
                var ratioY = (double)maxHeight / bitmap.Height;

                var ratio = Math.Min(ratioX, ratioY);

                var newWidth  = (int)(bitmap.Width * ratio);
                var newHeight = (int)(bitmap.Height * ratio);

                var scaledBitmap = new Bitmap(bitmap, newWidth, newHeight);
                bitmap.Dispose();

                return scaledBitmap;
            }

            catch
            {
                // If there's not enough memory the above code can fail.
                // Also, 'pathname' may not be able to be converted into a Bitmap.
                return null;
            }
        }

       
        private void AddPictureBox(ShapeNode box, string pathname)
        {
            var yOffset = CountOfLinkAttachments(box) * 7;

            var pictureBox = FlowChart.Factory.CreateShapeNode(box.Bounds.X - 7, box.Bounds.Y + yOffset, 6, 6, Shapes.Rectangle);

            pictureBox.Transparent = false;
            pictureBox.Locked      = true;
            pictureBox.Expandable  = false;

            // Create a scaled bitmap of the picture 40 x 40 pixels
            Bitmap bm = ScaleImage(pathname, 40, 40);

            pictureBox.Image = bm;
            pictureBox.ImageAlign = ImageAlign.Stretch;

            // Attach the picture box to the subordinate group (Top Left)
            SubordinateGroup(box).AttachToCorner(pictureBox, 0);
        }

DavidL

I put a breakpoint on the catch block you mentioned and there was no exception thrown.

I don't have a file to hand that is less than your 700 KB limit. Is there another way I can get the file to you?

DavidL

It's displaying on our end, testing on Windows 11. Does this project show any of the bitmap copies on yours?

https://mindfusion.eu/_samples/ImageTest.zip



Also are all images that do not load for you that large (~ 5500 x 3500)? I think GDI and GDI+ weren't able to load bitmaps larger than about 3000 x 3000 pixels on older versions of Windows, but don't know if that was a fixed limit by the OS of video RAM -related.

Regards,
Slavcho
Mindfusion

After much experimentation, I could not find what I was doing differently. However, scaling the image to 100 x 100 rather than 40 x 40 seems to have solved the problem.
Not the best solution, but the one I am going with for now.

Thanks for your help
DavidL

Sorry, that seems to be difficult to test in my application. I would just say that increasing the scale size from 40x40 to 44x44 makes the images display OK.

DavidL

The colour of the first pixel has changed, as I might expect. But the 'Alpha' component has also changed, which I would not expect. This explains why there is an image there, but very faint.

100 x 100

Color [A=255, R=150, G=190, B=232]
2
96
96
[ImageFormat: b96b3caa-0728-11d3-9d7b-0000f81ef32e]
Format32bppArgb

40 x 40

Color [A=32, R=255, G=255, B=255]
2
96
96
[ImageFormat: b96b3caa-0728-11d3-9d7b-0000f81ef32e]
Format32bppArgb

DavidL

Sorry, that did not seem to help.

Color [A=32, R=255, G=255, B=255]
2
96
96
[ImageFormat: b96b3caa-0728-11d3-9d7b-0000f81ef32e]
Format32bppArgb

DavidL