Generating distinguishes colors from QColor::colorNames()

[time]

Hi
I wrote a small loop in c++ for generating colors from QColor::colorNames(). But it generates it reaaaaly randomly, so together they look really really bad.
Is there any idea how to generate distinguishable colours(blue, red, green, yellow, orange, white etc.) first? I know it depence from i-value in loop, but no idea how to set it
Here is my code:

QStringList colorName = QColor::colorNames();
    QVector<QColor> colorCat(numCat); // number of categories I have to color
    for(int i =0; i < numCatt; i++)
        colorCat[i] = colorName[i]; //I also tried something like colorName[2*i], or [i*i] to generate something normal, but it failed

QStringList colorName = QColor::colorNames();
    QVector<QColor> colorCat(numCat); // number of categories I have to color
    for(int i =0; i < numCatt; i++)
        colorCat[i] = colorName[i]; //I also tried something like colorName[2*i], or [i*i] to generate something normal, but it failed

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