I found an answer to filling inside an ellipse. What about omitting the ellipse?

Thanks.

Steve

# Topic Title

- Topic description

I found an answer to filling inside an ellipse. What about omitting the ellipse?

Thanks.

Steve

Try drawing a rectangle or other shape around the ellipse then hatching the area on the outside of the ellipse and inside of the rectangle.

DataCAD user since v4!

Regards

Mark Bell

Principal

ATELIER MARK BELL

Australia

https://www.ateliermarkbell.com

Regards

Mark Bell

Principal

ATELIER MARK BELL

Australia

https://www.ateliermarkbell.com

You can do a void for many shapes, in the middle of a hatch or fill. You need to do it manually, with the 4 arcs method.

With a little practice, you can use 3-Point arcs to do the R1 and R2 arcs illustrated above.

Or, you can use the Approximate option in the Curves, Ellipse menu. You can also adjust the Arcs / Quadrant. Increase them for narrower ellipses.

Neil Blanchard likes this

I've been using datacad since the 80's. never used ellipse/approximate. Works great for this application. Thanks, Mark!

I appreciate the tip.

Neil Blanchard wrote:Hi Steve,

You can do a void for many shapes, in the middle of a hatch or fill. You need to do it manually, with the 4 arcs method.

With a little practice, you can use 3-Point arcs to do the R1 and R2 arcs illustrated above.

Thanks for the reply Mark.

Mark Bell wrote:Try drawing a rectangle or other shape around the ellipse then hatching the area on the outside of the ellipse and inside of the rectangle.

SCarini wrote "As far as I can tell Border/Cont Search does not find the ellipse."

Actually, you're right on this. I did a quick test using a true ellipse (dynamic) and one with Approximate used and either 36 or higher arc segments. I wasn't expecting the true ellipse to work, but was surprised the segmented one didn't allow hatching on the outside of the ellipse and outer rectangular boundary. The contour search easily filled the inside but not so when on the outside!

What was possible using contour search was to fill the inside of the ellipse, then the whole rectangle (outside), then add a void by removing the ellipse-fill from the rectangle-fill.

Actually, you're right on this. I did a quick test using a true ellipse (dynamic) and one with Approximate used and either 36 or higher arc segments. I wasn't expecting the true ellipse to work, but was surprised the segmented one didn't allow hatching on the outside of the ellipse and outer rectangular boundary. The contour search easily filled the inside but not so when on the outside!

What was possible using contour search was to fill the inside of the ellipse, then the whole rectangle (outside), then add a void by removing the ellipse-fill from the rectangle-fill.

DataCAD user since v4!

Regards

Mark Bell

Principal

ATELIER MARK BELL

Australia

https://www.ateliermarkbell.com

Regards

Mark Bell

Principal

ATELIER MARK BELL

Australia

https://www.ateliermarkbell.com

thanks for the additional info.

"then add a void by removing the ellipse-fill from the rectangle-fill."

Please, what are the steps/menu selections, for adding a void?

I know I did it once or twice a decade or two ago. Can't remember how.

Thanks again.

Steve

Using the 3 images posted earlier:

1. Hatch the inside of the ellipse using contour search,

2. Hatch the outside = the full rectangle,

3. In Hatch, pick Boundary, F0 Voids, it then asks to select the master polyline = the full rectangle being the largest hatch area,

4. Then you can F8 Add Void by selecting the hatch within the ellipse - probably best to use Area - the result is the larger hatch (rectangle) removes the smaller hatch (ellipse) leaving the void in the centre,

This also works the same with Fills.

1. Hatch the inside of the ellipse using contour search,

2. Hatch the outside = the full rectangle,

3. In Hatch, pick Boundary, F0 Voids, it then asks to select the master polyline = the full rectangle being the largest hatch area,

4. Then you can F8 Add Void by selecting the hatch within the ellipse - probably best to use Area - the result is the larger hatch (rectangle) removes the smaller hatch (ellipse) leaving the void in the centre,

This also works the same with Fills.

DataCAD user since v4!

Regards

Mark Bell

Principal

ATELIER MARK BELL

Australia

https://www.ateliermarkbell.com

Regards

Mark Bell

Principal

ATELIER MARK BELL

Australia

https://www.ateliermarkbell.com

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