Snap object's center to grid

[wizard509]

I don't see that Larry... there is the rotation origin point, which is a circle with a cross on it...

Odd, I get the same on the quick shapes as I do using the freehand tool. But you are right it is a circle with a cross in it.
OK, I tested it again several times and this time they are different. Therefore please accept my humble apology Gary, I stand corrected.

[handrawn]

if you have 'show rotation handles' button pressed on the infobar you will see rotation origin point on both, easy done

[Egg Bramhill]

It's interesting to see how Xara determines the centre of a triangle & and it's centre of rotation.

[handrawn]

we had a thread about this a while back - the geometricians [is that a word?] were musing on the ways of defining theoretical centres of asymmetric objects...

[Egg Bramhill]

.. geometricians [is that a word?]

Well it is now. I remember that thread.

[handrawn]

I haven't time to check it out - but is the xara way you posted based on the four quartiles of the triangle all having the same area in terms of square inches/cm/pixels [square pixels, there's a concept...]

I once asked a xerox machine operator to reduce an A3 sheet down to '50% fixed aspect' [ie A5] - back came an A4 sheet.. well you asked for half size was the explanation which it is by surface area, but it was not what I had actually asked for.... I actually asked for a 50% reduction to both axis...

[Egg Bramhill]

I'd just ask for an A5 next time

Xara determines the centre of rotation to be half the shapes bounding box's x & y value. This can be odd if a triangle is rotated.

The centroid indicated on a triangular quick shape however is determined by the intersection of lines from each corner to the half way point of the opposite edge.

[handrawn]

you are right of corse - I was just forgetting 50% is a special case [in terms of A sizes] as opposed to say 32%.... someone took what they thought was a 'short-cut'

the rotation point can be moved of course....