Change of height of a horizontal line (or width of vertical)

[Nizamov Shawkat]

1) create a horizontal (or vertical) straight line and select it
2) try to change it height (or width) which is actually a thickness of a line
3) unexpectedly line shifts in horizontal (or vertical) direction. I think that there should be no changes at all, even thickness should not change (because for tilted lines such sequence should give a change in the shape of a line).

[su_v (suv-lp)]

Please provide information about your OS and Inkscape version (see Inkscape menu 'Help > About Inkscape').

> 2) try to change it height (or width) which is actually a thickness of a line

- What are the 'Affect:' settings of the select tool?
- Which bounding box mode do you use?
- Any active snap modes in effect?

> even thickness should not change

Whether the "thickness" (stroke width) changes or not depends on the 'Affect:' setting of the select tool ('Scale stroke width'): turn off stroke scaling to keep the stroke width unchanged when scaling a selection of stroked paths/objects with the select tool. For non-technical drawings (artistic drawings or illustrations), the scaling of the stroke width is often preferred when scaling a selection (thus it is the default setting).

Keep in mind that the select tool transforms a _selection_ (one or more objects, based on their (visual or geometric) bounding box), not an object's geometry itself: use the node tool to edit the geometry of simple lines without affecting the stroke attributes, or manually change the stroke width in 'Fill & Stroke > Stroke style' if needed.

With regard to the displacement:
testing on Mac OS X 10.5.8 (i386), with default prefs, stroke scaling turned off, no active snapping:
1) Reproduced with Inkscape 0.48.2: the stretched line is displaced (moved) by the amount of the vertical/horizontal stretch
2) Partially reproduced with Inkscape 0.48+devel r10737:
vertically stretching a horizontal line up (in positive y direction) does neither displace the line nor scale the stroke width, vertically stretching a horizontal line down (negative y direction) still displaces (moves) the line without scaling the stroke width
(same with vertical line: no changes when stretching to the right, displaced when stretching to left)

Related:
Bug #706509 in Inkscape: “Endpoint of scaled line segment moves”
<https://bugs.launchpad.net/inkscape/+bug/706509>

[su_v (suv-lp)]

The change of height of a horizontal line is only a bug if it happens despite having turned off stroke scaling (same for the width of vertical lines).

[Diogo Almeida (digalmeda)]

I also got this bug, with the stroke scaling disabled. I'm running inkscape 0.48 on linux mint 11.

[Diogo Almeida (digalmeda)]

I'm terribly sorry. After all, it just appears that the line is going to increase in height, when I stretch it horizontally. When I release the mouse button, it goes back to it's previous height. I don't know if that's an intended feature, but it doesn't affect the end result, so I'm pleased.

[su_v (suv-lp)]

> When I release the mouse button, it goes back to it's previous height.

This is tracked in
Bug #165727 "display is wrong when transforming by mouse"
<https://bugs.launchpad.net/inkscape/+bug/165727>

[Beluga (buovjaga)]

Changing status to Invalid as there does not appear to be a bug in this report.

[andrew jones (andrew-jones0800)]

I have just recreated this bug Inkscape 0.92.1 r15371, WIN8.1 PRO x64

VIDEO of issue
https://drive.google.com/file/d/0B0G3yfJG4K_sek5qMDBQWkx3Mjg/view?usp=sharing

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.