measured size of triangle seems incorrect

[Andreas S]

Hi,

I have created a triangle with right angle. As of my mathematical understanding, length and width of the triangle should be the same. Designer wants to make me believe, that it is 18.7 mm wide and 20.9 mm high.

I also created a square with the same size on screen and here the dimensions seem to be correct.

[walt.farrell]

I don't see any triangles in your screenshots. Top one is a parallelogram and bottom one is a rectangle.

[Andreas S]

The object in the 1st screenshot is a triangle (in light grey) - only the surrounding handles form a parallelogram.

[walt.farrell]

12 minutes ago, Andreas S said:

The object in the 1st screenshot is a triangle (in light grey) - only the surrounding handles form a parallelogram.

No, you may see a triangle, but the object you have selected is a parallelogram, and so that's what the Transform panel is measuring for you.

[Andreas S]

Hmm, I created a triangle and distorted it by dragging the top corner straight over the lower right corner. Why should it be a parallelogram? The handles of a triangle without transformation form a rectangle. Anyway the object is a triangle.

[walt.farrell]

2 minutes ago, Andreas S said:

Anyway the object is a triangle.

Does the Layers panel agree with you?

Can you share the .afdesign file?

[Andreas S]

Yes, it agrees and tells me "triangle".

The triangle is on artboard2 in the lower right corner

Eine Seerose2.afdesign

[Corgi]

That's a triangle that's skewed. Seems to me this is a bug, since as you skew it the height shouldn't change. If I try this on Designer v1 I see the same effect: skewing it causes the height to become incorrect. 

The height seems to become equal to the length of the right-side of that parallelogram.

[Corgi]

1 minute ago, N.P.M. said:

Press the period button to change the boundingbox and you will see that the height is 18.71 mm

True. But when the bounding box is displayed as a parallelogram, the displayed height doesn't intuitively correlate with what you'd expect.

[walt.farrell]

53 minutes ago, Andreas S said:

Hmm, I created a triangle and distorted it by dragging the top corner straight over the lower right corner. Why should it be a parallelogram? The handles of a triangle without transformation form a rectangle. Anyway the object is a triangle.

I'm curious what triangle you started with, Andreas.

If I draw a Triangle while holding Shift, I get this:

If I then drag that red node to the right, so it is directly over the lower right corner, I get this:

 

Note that:

• The measurements have not changed.
• The bounding box is still a rectangle, not a parallelogram.

 

[walt.farrell]

Ah. I think that rather than dragging the red node, you skewed it by dragging the line leading up to the top handle. That gives the parallelogram.

I'm not yet sure whether it should have changed the height.

[NotMyFault]

If you skew an object, the height is measured along the skewed edge and this naturally becomes larger.

try it out with a rectangle. 

[Andreas S]

Thanks to all for your efforts. This explains what Designer is doing.