real ruler on iOS and android

  • In fact, I want to try to zoom-in and zoom-out my screen.

    But my first thing it to set the real size on my screen for each object.

    Hence, I want to put a ruler to measure my each object on my app.

    My first thing is to know how to set the ratio for each object length.

    I find some document, but I still have no idea.

            console.log("Screen.pixelDensity : "+Screen.pixelDensity)
            console.log("Screen.devicePixelRatio : "+Screen.devicePixelRatio)

    How to translate to my real scale? How to get the ratio?

    What function could I use in QML and widgets ?

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