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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