A4

Path doesn't handle correctly <text> tag.

Bug #595428 reported by Andrea Gasparini
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
A4
Triaged
High
Unassigned

Bug Description

Using text ids inside a4 information metadata broke the presentation.

Traceback (most recent call last):
  File "/home/gaspa/Projects/a4/trunk/a4lib/app.py", line 155, in on_toolbutton_next_clicked
    self.set_current_animation(start, end)
  File "/home/gaspa/Projects/a4/trunk/a4lib/app.py", line 133, in set_current_animation
    end_props = self.svg_image.get_item_properties_by_id(end_id)
  File "/home/gaspa/Projects/a4/trunk/a4lib/presentation.py", line 172, in get_item_properties_by_id
    target_element[0].attrib.get('width'))
TypeError: float() argument must be a string or a number

Revision history for this message
Andrea Gasparini (gaspa) wrote :
Changed in a4:
milestone: none → 0.02
status: New → Triaged
Andrea Gasparini (gaspa)
Changed in a4:
assignee: Andrea Gasparini (gaspa) → A4 Developers (a4-dev)
Revision history for this message
Andrea Gasparini (gaspa) wrote :

Svg text elements are quite complex, and I'm asking if we really want to specifying text tags as point of an A4 presentation.
 First of all, they don't have width/height attributes, so we'd want to calculate them from other properties of the text inside the tag ( in first instance you'd need to know the starting point of the text [x,y] and the size of the text [font size * lenght in chars?] )

Moreover, they can be combined with <tspan> et similia, they can be many lines of text (each of them can have modifiers of the size and whatever...).

So, I'm just guessing if we can ignore <text> and surrender all the region of interests of an A4 presentation with a rectangle, even transparent/hidden/whatever , at least until we have to directly handle SVG internals.

Revision history for this message
Andrea Gasparini (gaspa) wrote :

uh, forgotten the link with documentation:
http://www.w3.org/TR/SVG/text.html

Revision history for this message
Andrea Gualano (andrea-gualano) wrote :

The size of a text object is not font_size * string_len: think "mmm" vs. "iii".

I think we should find some library to do these calculations for us.
For instance, see how easy it is to find a bounding box inside a browser, using DOM and Javascript:
http://my.opera.com/MacDev_ed/blog/2009/01/21/getting-boundingbox-of-svg-elements

Revision history for this message
Andrea Gasparini (gaspa) wrote :

we can't get BBox of elements without a proper DOM implementation, so I removed the milestone, till we'll found a dom library ( or implement it)

Changed in a4:
milestone: 0.02 → none
Andrea Corbellini (andrea.corbellini)
Changed in a4:
assignee: A4 Developers (a4-dev) → nobody
Revision history for this message
Andrea Colangelo (warp10) wrote :

Any update about this bug?

Revision history for this message
Alessandro Losavio (alo21) wrote : Re: [Bug 595428] Re: Path doesn't handle correctly <text> tag.

Il 25/09/2010 17:25, Andrea Colangelo ha scritto:
> Any update about this bug?
>
>

no I am sorry i only reported this bug.

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