Display SVG image in QtWebView with the right size

Question

Display SVG image in QtWebView with the right size

1.4k Views Asked by xralf At 04 April 2025 at 01:11

I'm trying to display some Wikipedia articles containing math in SVG images in QtWebView, though I can't figure out how to set width and height attributes of the image. QtWebView will ignore these attributes and when I omit them the image is very small.

You can test it as follows: Download this HTML editor. Go to this web page and download e.g. this SVG image.

Create img element, reflecting the styling in Wikipedia:

<img src="e15d3619d42b28662c5952c9ece60cd928e31774.svg" style="vertical-align: -0.671ex; width:25.517ex; height:2.343ex;">

And the image will be ignored.

The following works, but the image is very small.

<img src="e15d3619d42b28662c5952c9ece60cd928e31774.svg" >

How to display the image with the right size (width and height)?

Original Q&A

There are 2 best solutions below

napuzba On 29 June 2017 at 11:33

Use other units for height and width. For example:

<img src="https://www.w3.org/Icons/SVG/svg-logo.svg" height='200px' />

**Andy Jazz** · Accepted Answer

Try to use this HTML approach for changing an SVG image dimensions:

<!-- you can test this code in any online html editor. -->

<html>
    <head>
        <!-- blah blah blah... -->
    </head>
    <body>
        <p>all the images must be redrawn properly when SVG animation runs...</p>
        <img height="250px" width="800px" border="5" src="https://wikimedia.org/api/rest_v1/media/math/render/svg/e15d3619d42b28662c5952c9ece60cd928e31774">
    </body>
</html>

Very often SVG height or width are incorrectly calculated in WebKit browsers. To solve this problem use this CSS style:

svg { width: 100%; height: auto; }

I've recently found quite useful and interesting post: CSS Tricks: How to Scale SVG.

Or try this Python approach for changing an SVG image dimensions described Here.

from PyQt5 import QtCore, QtGui, QtSvg
from PyQt5.QtWebKit import QGraphicsWebView
import sys

application = QtGui.QApplication(sys.argv)
myScene = QtGui.QGraphicsScene()
myView = QtGui.QGraphicsView(myScene)
box = QtSvg.QGraphicsSvgItem('/Users/swift/Desktop/myImage.svg').boundingRect()
webView = QGraphicsWebView()
webView.load(QtCore.QUrl('/Users/swift/Desktop/myImage.svg'))
webView.setFlags(QtGui.QGraphicsItem.ItemClipsToShape)
webView.resize(box.width(), box.height())

incWidth = 48
incHeight = 36
myScene.addItem(webView)
myView.resize(box.width() + incWidth, box.height() + incHeight)
myView.show()
sys.exit(app.exec_())

And, of course, you can call setHtml() public function with argument:

code = 
       """
       <html>
       <head>
       </head>
       <body>

       <!-- You can load SVG image itself. -->
       <img height="250px" width="800px" style="width: 100%;" src="myImage.svg">

       <!-- Or you can load SVG Viewport and use other images inside it. -->
       <svg width="600" height="450">
       <image href="myImage.svg" x="0" y="0" height="320px" width="240px"/>
       </svg>

       </body>
       </html> 
       """

self.webView.setHtml(code)

Or assign the size directly via Qt:

svgImage = QImage(QSize(1280, 720))

Also look at official Qt SVG Documentation describing XML-based approach Here.

Display SVG image in QtWebView with the right size

There are 2 best solutions below

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