Nice to watch Marco.
You are solving these faster than I can make them!
My solution uses the ellipse, a circle and a line.
- Create a Green circle, a Blue Line and a Red ellipse, all 400px wide; the Red ellipse can be a clone of the Green circle, halving its Height.
- Place the circle and ellipse bases together; the circle's centre is now on the ellipse edge. the length of a radius to either of the points where the line cuts the circle are, necessarily, 200px. The chord, the line in the green, is what we want.
- Select the line and circle and Intersect.
- Switch to the Shape tool after selecting the chord (this is a shape and not a line); it has zero Line size.
- Click on the chord to add a Node.
- Drag the Node to any point of the Red ellipse.
Focal Points Ellipse.xar
Instead of a line, I halved a cloned ellipse to the same effect. I found the line solution clearer.
Acorn
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