Usage of inkex.TextElement.shape_box() method - Creating New Extensions

#1
Pavel Serikov @jaih
2021-06-14
Official description of shape_box method looks like:
```
Returns a horrible bounding box that just contains the coord points of the text without width or height (which is impossible to calculate)
```
Why it's impossible to calculate width or height of text ?
#2
Polygon @Polygon⚖🌶
2021-06-14
Anhänge
That is maybe because it dynamically changes with the use of descender+ascender etc if this makes sense.

2021-06-14

Is it possible to calculate width and height of text in Inkscape using other methods ?

By the way, I saw that there is standart getBBox() method at SVG 2.0 spec, doing same that I need from Inkscape:

<!DOCTYPE html>
<html>
<body>
<svg>
  <text id="svg1" x="50" y="50" style="font: bold 24px sans-serif;">I love SVG!</text>
</svg>

<script type="text/javascript">
  textElement = document.getElementById("svg1");
  var bbox = textElement.getBBox();
  console.log(bbox);   // SVGRect { x: 50, y: 27, width: 148.78334045410156, height: 29 }
</script>
</body>

If I change font size or style in example above - bbox var is changing and calculating fine.

If I do same in Python - result is not ok

#!/usr/bin/env python

import inkex
from pprint import pprint

text = inkex.TextElement.new(x="50",y="50", style = {'font': 'bold 24px sans-serif'} );
text.text = 'I love SVG!'
print(text.shape_box())                  # BoundingBox((50.0, 50.0),(50.0, 50.0))

Any chance to count bbox of text in Inkscape?

My versions:

$ inkscape --version
Inkscape 1.1 (1:1.1+202105261517+ce6663b3b7)

$ pip freeze | grep inkex
inkex==1.0.1

$ pip freeze | grep lxml
lxml==4.5.0

#4
Polygon @Polygon⚖🌶
2021-06-14

Maybe try your query in the Chat: https://chat.inkscape.org/channel/inkscape_extensions
Good luck.
#5
Pavel Serikov @jaih
2021-06-15

Response from chat:
> @pavelsr It's not possible to calculate the bounding box, because we don't have the paths for the text. All we know is that you have some text, we have no idea what it looks like, and therefore how big it is.
But it doesn't work if I have paths for the text. If I use text.get_path().shape_box() instead of text.shape_box() I got AttributeError: 'Path' object has no attribute 'shape_box'
If I make text.get_path().bounding_box() it returns None
How to get paths for text and then get bounding box for it ?
#6
Polygon @Polygon⚖🌶
2021-06-15

jaih
because we don't have the paths for the text.
That is what I was trying to say. Text object is dynamically updating and has probably too many variables like myriads of font types for instance.

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Creating New Extensions Usage of inkex.TextElement.shape_box() method