I'm trying to place small circles equaly distant along a semicircunference. Inkscape provides basic options to distribute horizontally and vertically, but can I do along a path, or in this case (if it's more easy) along a semicircunference?
Another possibility is to use radial clones, for cloning the small objects/circles around a common center, creating a circle of objects, and then deleting half of the circle, and "uncloning" the remaining objects.
It allows you to choose exactly how many clones you want in a full circle of 360 degrees.
Here is a video that shows how to make radial clones: http://www.youtube.com/watch?v=D0I51hXCdvE
- change the center of rotation of the object (the small circle), to set it in the center of the big imaginary circle, around which the objects will be cloned.
- select your small circle, go to Edit > Clone > Create tiled clones
- Clone settings: 1 row, 20 columns (or however duplications you need on a full circle)
- In Shift tab: per row, set shiftX to -100%, per column set shiftY to -100%
- In Rotation tab: per column: 360 divided by 20 (or your number) = 18 degrees.
- Click Create
Undo and adapt settings if necessary.
You can use Pattern on Path extension or the likewise named live path effect.