Dibujar una llamada sobre un gráfico
Nota: Esto es parte del ejemplo de la Galería de Gráficos con Widgets.
La clase QChart proporciona dos métodos que mapean entre las coordenadas de la escena y el dominio de la serie (definido por los rangos de los ejes).
QPointF QChart::mapToPosition(const QPointF &value, QAbstractSeries *series)
QPointF QChart::mapToValue(const QPointF &position, QAbstractSeries *series)
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