Is there a widget to draw a function ?

[archqt]

Hi,
for example i would like to Draw sinus(x) from 0 to 2PI (in QML if possible or QWidgets). Is there something already done ? (i prefer to ask before doing the thing).
Thanks

[onek24]

Hello,

i don't know of an existing component for your purposes, but you might check out this "thread":http://qt-project.org/forums/viewthread/8998 .

[archqt]

Hi,
Already seen it but thanks for the answer.
Sincerely

[Torgeir]

For a simple plot of a function a Canvas may suffice:

@Canvas {
width: 300
height: 200
onPaint: {
var numSamples = 300
var amplitude = 100

        var ctx = getContext("2d")
        ctx.beginPath()
        for (var i = 0; i < numSamples; ++i)
            ctx.lineTo(i, amplitude + Math.sin(2 * Math.PI * i / numSamples) * amplitude)
        ctx.stroke()
    }
}

@

If you need complex scientific plots, have a look at Qwt. Using Qwt in a QQuickPaintedItem looks fairly straight forward. I googled and found an example "here":http://vadim-d.blogspot.no/2013/07/qml-qwt-android.html (the blog post is in russian, but the code is in english).

[archqt]

Hi,
that what i thought i will have to do it by myself or use qwt.
Thanks for your answers