Rotate to minimum rectangle

[shantisoftware]

Has anyone got an algorithm to rotate a CadImage to minimum rectangle.
I have a simple one that is working for most drawings, where I just use CadImage.Rotate about z axis, and iterate through 360 degrees to find the angle with the smallest rectangle via PureExtents.
I came across some examples where the results of cadImage.PureExtents give weird results as I rotate. I can't see why.

[support]

Has anyone got an algorithm to rotate a CadImage to minimum rectangle.
I have a simple one that is working for most drawings, where I just use CadImage.Rotate about z axis, and iterate through 360 degrees to find the angle with the smallest rectangle via PureExtents.
I came across some examples where the results of cadImage.PureExtents give weird results as I rotate. I can't see why.

Hi,
We have a Viewer demo, that illustrates how the Rotate function works. Most likely, you should recalculate the extents after you rotate the CADImage:

Code: Select all

this.cadImage.Rotate(Axes.Z, angle);
            this.cadImage.GetExtents();

Also, if you want to get pure extents without margins, you should check the IsWithoutMargins property of CADImage.

Catherine.

[shantisoftware]

Hi Catherine

From what I can see that method doesn't actually rotate the co-ordinates of the points, as when I load the saved file into another CAD program nothing has changed.

I've used the other sample with RotatePolyLine, RotateText, etc, to work through each entity and rotate it about a common centre point.

Am I missing something?

[support]

Hi Catherine

From what I can see that method doesn't actually rotate the co-ordinates of the points, as when I load the saved file into another CAD program nothing has changed.

I've used the other sample with RotatePolyLine, RotateText, etc, to work through each entity and rotate it about a common centre point.

Am I missing something?

Hi,
well, the cadImage.Rotate function should be working correctly.
Here is a code example of the Rotate function usage:

Code: Select all

string pathdxffile = @"d://Test.dxf";
   string pathoutdxffile = @"d://Test30.dxf";
   this.cadImage = CADImage.CreateImageByExtension(pathdxffile);
   cadImage.LoadFromFile(pathdxffile);
   cadImage.Rotate(Axes.Z, 30);
   var vExp = new CADImport.Export.DirectCADtoDXF.CADtoDXF(cadImage);
   vExp.Version = DWGVersion.ACR2004;//or choose ACR2000
   vExp.SaveToFile(pathoutdxffile);

If something goes wrong, please, send us your code snippet and file example.
Catherine.