Скачать или смотреть How to Simplify SVG by Removing the ViewBox Attribute for PDF Integration

Learn how to automate the process of simplifying SVG files by removing the viewBox attribute. This guide will help you ensure precise positioning and scaling when rendering SVGs in PDF documents using JavaScript.
---
This video is based on the question https://stackoverflow.com/q/63454919/ asked by the user 'Sbraaa' ( https://stackoverflow.com/u/590503/ ) and on the answer https://stackoverflow.com/a/63466069/ provided by the user 'enxaneta' ( https://stackoverflow.com/u/7897395/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: simplify svg (remove viewBox attribute) to obtain pure svg path

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Simplify SVG by Removing the ViewBox Attribute for PDF Integration

SVG (Scalable Vector Graphics) is widely used for drawings and graphics on the web. However, when users create their own SVG drawings that need to be saved as PDF files, they often encounter issues—particularly with the viewBox attribute. This post discusses the problem and outlines an automated solution for removing the viewBox attribute to ensure precise positioning and scaling in your PDF documents using JavaScript.

The Problem: ViewBox Attribute Confusion

When you crop an SVG to remove any unused white space, a viewBox attribute is typically added. While this attribute is intended to define the position and dimension of the SVG, many JavaScript PDF libraries do not support it, leading to incorrect positioning and scaling in the final documents.

Why is ViewBox a Problem?

Incorrect Positioning: viewBox can cause your SVG graphic to display in the wrong location within the PDF.

Scaling Issues: The scaling based on viewBox is not recognized by many JavaScript libraries used for PDF generation, resulting in distorted images.

The Solution: Automating SVG Simplification

To effectively handle SVG simplification and remove the viewBox attribute without losing essential drawing data, follow these steps:

Step 1: Extract the ViewBox Values

The viewBox attribute generally consists of four values: min-x, min-y, width, and height. When the values for min-x and min-y are zero, you can simply use width and height for your SVG dimensions. However, this is not usually the case when cropping occurs.

Step 2: Adjust the SVG Group

If the min-x and min-y values are not zero, wrap the SVG elements inside a <g> (group) element and translate them in the opposite direction:

Calculate the translation values: -min-x and -min-y.

Apply the translation to the group to ensure the drawing is correctly shifted back into the viewport.

Step 3: Convert d Attributes to Relative Commands

Another efficient method is to convert all d attributes of the SVG path to relative commands. Instead of translating, adjust the first move-to (M) values to recalculate the path:

Convert the path data to relative coordinates.

Adjust the move coordinates to account for the min-x and min-y offsets.

Example Code Implementation

Below is a JavaScript code snippet to automate this process:

[[See Video to Reveal this Text or Code Snippet]]

Additional Notes

Ensure that you include necessary libraries like Snap.svg in your project for SVG manipulations.

Test the resulting SVG in your PDF generation library to check for validation before finalizing the implementation.

Conclusion

By understanding the impact of the viewBox attribute on SVG rendering within PDF files and applying the methods outlined here, you can automate the simplification of SVG files effectively. This approach not only eases the process but also ensures your graphics are rendered accurately at the desired positions and scales. Happy coding!