Re: Store coordinates of zoomed image and load those coordinates for other images

Hello
Im using vb.net and LT v17

In WindowsForm using RasterImageViewer
I need to capture the coordinates of an loaded image in Rasterimageviewer and then calling those coordinates when i load another image in Rasterimageviewer.

any help is appreciated

Best regards
AN

Probably i found the solution.

I capure the coordinates in this way:

Dim trans As New Transformer(RasterImageViewer1.Transform)

Dim rectF As New RectangleF(CSng(RasterImageViewer1.ClientRectangle.X), CSng(RasterImageViewer1.ClientRectangle.Y), CSng(RasterImageViewer1.ClientRectangle.Width), CSng(RasterImageViewer1.ClientRectangle.Height))

rectF = trans.RectangleToLogical(rectF)

rectF contain X, Y, Width, Height
RasterImageViewer1.ScaleFactor contain the ZoomFactor


Now i load the other image on this way:

TxtBoxX_R, TxtBoxY_R, TxtBoxW_R, TxtBoxH_R are the captured coordinates and TxtBoxZ_R zoom factor.

Dim viewer As RasterImageViewer = RasterImageViewer1 ' get the active viewer
Dim Rect As New Rectangle(CInt(TxtBoxX_R), CInt(TxtBoxY_R), CInt(TxtBoxW_R), CInt(TxtBoxH_R))

Dim trans As New Transformer(viewer.Transform)
Dim RectF As New RectangleF(Rect.X, Rect.Y, Rect.Width, Rect.Height)
RectF = trans.RectangleToPhysical(RectF)

'Dim viewer As RasterImageViewer = RasterImageViewer1 ' get the active viewer
Dim center As PointF = New PointF(RectF.Left + CInt(RectF.Width / 2), RectF.Top + CInt(RectF.Height / 2)) ' get the center of what you see in physical coordinates

Dim t As Transformer = New Transformer(viewer.Transform)
center = t.PointToLogical(center) ' get the center of what you see in logical coordinates
' zoom

Dim scaleFactor As Double = CDbl(TxtBoxZ_R)
viewer.ScaleFactor = scaleFactor
' bring the original center into the view center
t = New Transformer(viewer.Transform)
center = t.PointToPhysical(center) ' get the center of what you saw before the zoom in physical coordinates
viewer.CenterAtPoint(Point.Round(center)) ' bring the old center into the center of the view

Do you want to get the coordinates of the image area that is visible?  You can just get the ScrollPosition and multiply it by the ScaleFactor.  That will give you the X and Y position, and then you can get the size of the RasterImageViewer and multiply it by the ScaleFactor to get the width and the height.

Thanks