How to get the specified position's QColor in QLinearGradient

[yxmaomao]

I am using Qt4.3 on Windows XP

my question as below:

QLinearGradient linearGrad(startPoint,endPoint);
linearGrad.setColorAt(0,QColor(12,23,24));                            
linearGrad.setColorAt(1,QColor(122,233,224));

QLinearGradient linearGrad(startPoint,endPoint);
linearGrad.setColorAt(0,QColor(12,23,24));                            
linearGrad.setColorAt(1,QColor(122,233,224));

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Now if I want to get the QColor of one specified position which is between startPoint and endPoint.
what should I do?

Thanks in advance!