Using QPainterPath to generate more complex "images"

[frnklu20]

does someone ave any tip to use QPainterPath to generate more complex "images" like these:![0_1567108141666_bitmap.png]

Is there a program that i can use to generate the path?

[SGaist]

Hi,

What is your use case ?

It looks like you should rather use an painting application like Inkscape or Gimp to create them and then te-use the images in your application.

[frnklu20]

Hi,

I created this images with inkscape, but i have the option to enlarge the diagramscene where i put these items. And when i apply the transfomations to zoom in, the images loose quality
so i wondered if using the QPolygonF my problems would be solved.

[SGaist]

Why not use a SVG image ?

[mrjj]

Hi
With SVG format and
https://doc.qt.io/qt-5/qgraphicssvgitem.html#details
zooming/enlarging should be possible without any loss of quality.

[fcarney]

Set sourceSize (height and width) or feed it Qt.size(x,y). Make this value as high as dimensions of object to maintain quality. Be careful setting it to the Image{} size as it will cause errors. Use external size to set the width and height.

For instance:

Image {
    id: logo

    // prevent binding loop, calc once
    property int calcHeight: parent.height*0.66
   
    height: calcHeight
    fillMode: Image.PreserveAspectFit    
    
    source: "logo.svg"
    // make it look right
    smooth: true
    antialiasing: true
    // this is needed to make the sampling decent
    // 1x will work as well    
    sourceSize.height: calcHeight
}

[frnklu20]

when i put

#include <QGraphicsSvgItem>

it gives me the error "diagramitem.h:5:10: error: 'QGraphicsSvgItem' file not found"

[mpergand]

If I'm looking at the doc, I see:

Header: #include <QGraphicsSvgItem> 
qmake: QT += svg

Have you add this to your pro file ?

[mpergand]

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