Hi there,
I am overlaying images on a multiscaleimage (deepzoom composition). I
am doing this by using the position of MultiscaleSubImage as a
placeholder for the overlay.
It is almost perfect, except that as the user pans and zooms the image
'floats' around. It seems symptomatic of a rounding problem but I can't
put my finger on it.
I worked out another way to calculate the x-axis position, where it
works perfectly and doesn't float but I was having trouble calculating
the y-axis position using the same method due to the aspect ratio I
think. In that version the y-axis position didn't float but it was
always approximately 30% too high up the screen.
Any suggestions?
Here is my code for the version that puts the overlay in the correct
position, but it floats when panning / zooming :
internal void DrawSubImageOverlay(MultiScaleSubImage subImage, Grid
imageContainer)
{
double scaleBy = 1 / subImage.ViewportWidth * 1 /
msi.ViewportWidth;
double width = scaleBy * this.msi.ActualWidth;
double height = (scaleBy * this.msi.ActualWidth * (1 /
subImage.AspectRatio));
imageContainer.Width = width;
imageContainer.Height = height;
Point testPoint = msi.LogicalToElementPoint(
new Point(
-subImage.ViewportOrigin.X * (1 /
subImage.ViewportWidth),
-subImage.ViewportOrigin.Y * (1 /
subImage.ViewportWidth)));
Canvas.SetLeft(imageContainer, testPoint.X);
Canvas.SetTop(imageContainer, testPoint.Y);
}
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