QML SceneGraph Custom Item- Each line with different color

[dheerendra]

Hi

I'm using the SceneGraph to write graph. Sample graph is provided. I would like to draw different color for each line. UpdatePainteNode(...) code is given here. Is this possible. I have tried with vertiexcolor etc. Not able to do this.
Scene_GraphImage.png

QSGNode *graph::updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData *)
{
    qDebug() << Q_FUNC_INFO << " Updating the node" <<endl;
    WaveForm *n= static_cast<WaveForm *>(oldNode);
    QRectF rect = boundingRect();
    if (!n) {
        n = new Graph();
        n->m_wave1 = new Node(this->m_maxPoints);
        n->appendChildNode(n->m_wave1);
        n->m_wave1->redraw(rect,data());
        m_waveForm = n;
    }else {
        n->m_wave1->redraw(rect,data());
    }
    return n;
}

[jay1]

@dheerendra said in QML SceneGraph Custom Item- Each line with different color:

tePaintNode(

I think it's possible. I saw some this like this implemented to draw graphs with different colors.
May be this may be of some help using 'QSGVertexColorMaterial ' & 'QSGFlatColorMaterial ' with flag 'QSGNode::OwnsMaterial'

[https://doc.qt.io/qt-5/qsgflatcolormaterial.html#details](For Reference)