Feature request: Add SVG `LinearGradient` and `RadialGradient` support

[andersonhc]

We recently added gradient support in the fpdf2 drawing API. You can now use an instance of fpdf.drawing.GradientPaint as fill_color or stroke_color in any PaintedPath or GraphicsContext.

Proposed feature

The next step is to extend this support to SVG rendering, by parsing <linearGradient> and <radialGradient> elements from SVG files.

The following methods already exist to help with the feature:

• fpdf.pattern.shape_linear_gradient()
• fpdf.pattern.shape_radial_gradient()

These functions take inputs that are very similar to the attributes found in SVG gradient elements and return a gradient instance compatible with fpdf.drawing.GradientPaint.

Implementing this feature involves:

• updating the SVG parsing class to detect <linearGradient> and <radialGradient> tags
• extract their attributes, and map them to shape_linear_gradient() or shape_radial_gradient()
• keep a map of gradient names to their corresponding GradientPaint objects
• apply the correct GradientPaint as fill-color or stroke-color when a gradient name is used on the svg

This issue is eligible for Hacktoberfest

By implementing this feature you, as a benevolent FLOSS developer, will provide access to the large community of fpdf2 users to a standard and useful PDF functionality.

Moreover, by working on this feature, you will learn about PDFs, fonts and the lifecycle & structure of a popular Python library.

You will also be added into the contributors list & map.

[Vatsal565]

Hi @andersonhc I would like to work on this feature.

[andersonhc]

Hi @andersonhc I would like to work on this feature.

Assigned to you. Please let us know if you have any question.

[Lucas-C]

Hi @Vatsal565 👋 🙂
Are you still working on this? Should we leave this issue assigned to you?
Do you have any question?

[Vedant817]

Hey @andersonhc , I would love to work on this issue. Please assign the issue to me.

[Lucas-C]

@Vedant817 you have asked to be assigned to 6 issues in the past 24 hours.
This is a lot, and it makes me doubt how serious you are about contributing to fpdf2.
Please choose only a single issue to work on at a time, and start by working on a first PR, or you behaviour will be considered to be spam.

[Ani07-05]

greetings @Lucas-C @andersonhc I would like to work on this , please consider assigning it to me.

[Vedant817]

Hey @Lucas-C , I would love to work on this issue, I have already contributed to the repository so I have understanding of the project and I feel can resolve it.

[andersonhc]

@Vedant817 I'm assigning this one to Ani07-05. You had volunteered for several issues but after the first didn't tell us what's the next you were going to work on. If you decide to work on another one let us know so we can assign you.