Hi,

ResizeToFitImage considers the bitmap's intrinsic DPI settings (Image.HorizontalResolution / VerticalResolution) when resizing the node, and that might actually scale the image if the display's DPI is different, leading to some bitmap resize artifacts. You could try directly setting the node's Bounds size to image.Width x image.Height to avoid that (also assuming you are using Pixel as MeasureUnit, which you used to some time ago if I recall correctly).

I hope that helps,
Stoyan

It probably generates the same result in terms of node size. However when a bitmap is drawn scaled, some of its pixel rows and columns must be either duplicated or deleted, and it might depend on current coordinates which ones GDI+ chooses to. You could also check if the nodes have integer coordinates for both position and size, and if not - round them down to integer.

It could be a clipping problem actually, since ShapeNodes are clipped to their Shape outline. Try custom drawing them, or overriding the Draw method to avoid clipping:

private void Form1_Load(object sender, System.EventArgs e)
	var image = (Bitmap)Image.FromFile("rect_frame.png");
	image.SetResolution(196, 196);
	diagram.MeasureUnit = GraphicsUnit.Pixel;
	for (int i = 0; i < 50; i+= 5)
	{
		var node = diagram.Factory.CreateShapeNode(i, i * 2, 5, 5);
		node.Image = image;
		node.CustomDraw = CustomDraw.Full;
		node.ResizeToFitImage();
	}
}

private void diagram_DrawNode(object sender, DrawNodeEventArgs e)
{
	var shape = e.Node as ShapeNode;
	if (shape != null)
		Utilities.DrawImage(e.Graphics, shape.Image, shape.Bounds, ImageAlign.Stretch);
} 

The nodes above show missing lines when not custom drawn but have Transparent enabled, which probably happen due to some imprecision in clipping regions. They are drawn fine if only drawing stretched images with custom drawing.

We also have a ClipImage property in the WPF version that controls whether images are clipped by the shape, we'll implement it in Windows forms too for next release.

I hope that helps,
Stoyan

Today I upgrade to Flowchart 6.0.2. It's a little worse for this problem - it will show as one or two pixels clipped every 3 pixels move in horizontal direction.

Looking forward to your clip option.

Why when I add handler for Diagram.DrawNode, it doesn't take effect - it never goes to the handler code? Thanks.

Thanks. I have got the DrawNode triggered by setting Transparent = false. But I finally found out the reason of the distortion - I thought I was setting the location for each node to integers without portions but that was not always true - which causes the node image to loose one line.
I have to adjust the Location to make sure they're integer aligned before each call to Node.Move(...).