Multiple QSGGeometryNodes simple xy line graph

[tcmichals]

I'm trying to create a simple x/y line graph, I'm very confused on how to managed multiple nodes, ie, x axis line, y axis line, and the actual real line. If the code just returns x_axis, or y_axis, and not calling the AppendChildNode works OK for the line.

Also, noticed that once all the nodes are added the application crashes on closing. Is there a special method to dispose of the Node objects?

@QSGNode *VtyGraphQT::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *)
{
QSGGeometryNode *background, *x_axis, *y_axis, *line = 0;
QSGGeometry *geometry=0, *x_axisGeo=0, *y_axisGeo=0, *lineGeo = 0;

if (!oldNode) {

    background = new QSGGeometryNode;

    x_axis = new QSGGeometryNode;
    y_axis = new QSGGeometryNode;
    line = new QSGGeometryNode;

    x_axisGeo = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 2);
    y_axisGeo = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 2);
    lineGeo = new QSGGeometry(QSGGeometry::defaultAttributes_Point2D(), 1024);

    x_axisGeo->setLineWidth(2);
    x_axisGeo->setDrawingMode(GL_LINE_STRIP);
    x_axis->setGeometry(x_axisGeo);
    x_axis->setFlag(QSGNode::OwnsGeometry);

    y_axisGeo->setLineWidth(2);
    y_axisGeo->setDrawingMode(GL_LINE_STRIP);
    y_axis->setGeometry(y_axisGeo);
    y_axis->setFlag(QSGNode::OwnsGeometry);

    lineGeo->setLineWidth(2);
    lineGeo->setDrawingMode(GL_LINE_STRIP);
    line->setGeometry(lineGeo);
    line->setFlag(QSGNode::OwnsGeometry);

    QSGFlatColorMaterial *material = new QSGFlatColorMaterial;
    material->setColor(QColor(255, 0, 0));

    x_axis->setMaterial(material);
    x_axis->setFlag(QSGNode::OwnsMaterial);

    y_axis->setMaterial(material);
    y_axis->setFlag(QSGNode::OwnsMaterial);

    line->setMaterial(material);
    line->setFlag(QSGNode::OwnsMaterial);


    background->setMaterial(material);
    background->setFlag(QSGNode::OwnsMaterial);

    background->appendChildNode(x_axis);
    background->appendChildNode(y_axis);
    background->appendChildNode(line);

     x_axisGeo->allocate(2);
    x_axisGeo->vertexDataAsPoint2D()[0].set(0,0);
    x_axisGeo->vertexDataAsPoint2D()[1].set(width(),0);

      y_axisGeo->allocate(2);
    y_axisGeo->vertexDataAsPoint2D()[0].set(0,0);
    y_axisGeo->vertexDataAsPoint2D()[1].set(0,height());


}else
{
    background = static_cast<QSGGeometryNode *>(oldNode);
}

return background;

}@

[tcmichals]

OK, I have this working now. But, how do you add text? i.e numbers on the axis?