401689 - stroke-width always relative to current user coordinate

Status: RESOLVED INVALID

(Core :: SVG, defect)

Description

[Robert]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.8) Gecko/20071008 Firefox/2.0.0.8
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.8) Gecko/20071008 Firefox/2.0.0.8

A stroke-width seem to always change in size relative to the current user coordinate system, even when the length that is specified includes a unit.

I tested this with a line.

The relevant specifications are found at:
http://www.w3.org/TR/SVG11/painting.html#StrokeProperties
http://www.w3.org/TR/SVG11/types.html#DataTypeLength

"If the <length> is expressed as a value without a unit identifier (e.g., 48), then the <length> represents a distance in the current user coordinate system.
If one of the unit identifiers is provided (e.g., 12mm), then the <length> is processed according to the description in Units."

When I have a line in a viewbox 400,400 and a line with stroke-width="1px" (or 1mm), and the viewbox is then modified to 100,100, then you can see how the width of the stroke is increased, while the specification says that it should not do that.


Reproducible: Always

Comment 1

[Robert Longson [:longsonr]]

Could you attach testcases showing the issue please?

Comment 2

[Robert Longson [:longsonr]]

If you change the viewbox as you suggest you are effectively magnifying what you see so the widths should increase. 

Comment 3

[Robert Longson [:longsonr]]

As per discussion in mozilla svg newsgroup, units simply act as scaling factors rather than being absolute dimensions.