void XMTelestration::onTouchMoved(int index, float x, float y)
{
    KEEP_ALIVE

    PortableLockGuard<std::recursive_mutex> guard(mtx);

    auto tx = x;
    auto ty = y;

    auto aspect = renderer->getAspectRatio();
    if (aspect > 1.0)
        ty /= aspect;
    else
        tx *= aspect;


    auto currentLineDrawing = existingDrawingFor(index);

    if (currentLineDrawing == nullptr)
    {
        currentLineDrawing.reset(new XMTelestrationLine(stroke.withWidth(stroke.width * previewScale)));
        currentDrawings[index] = currentLineDrawing;
    }

    renderer->getAspectRatio();

    currentLineDrawing->addPoint(
        tx * (width*previewScale) / 2.0f + (width*previewScale) / 2.0f,
        ty * (height*previewScale) / 2.0f + (height*previewScale) / 2.0f);

    updateQueue->invoke([this, SELF, currentLineDrawing]() {

        updateLayers(Preview);

        if (hub)
        {
            auto lineDrawing = std::make_shared<XMTelestrationLine>(*currentLineDrawing);
            lineDrawing->scale(1.0f / previewScale);

            hub->broadcastMessage(std::make_shared<AddTelestrationMessage>(lineDrawing));
        }
    });
}