add

Adds color stops to the gradient in the pairs list being the left of the pair the ratio between 0.0 and 1.0, and the right of the pair the Color

Adds colors c0 and c1 to the gradient equidistantly

Adds colors c0, c1 and c2 to the gradient equidistantly

Adds colors c0, c1, c2 and c3 to the gradient equidistantly

Adds colors to the gradient equidistantly