RadialGradientFilling[{col1, col2, …, coln}]
RadialGradientFilling[{r1, r2, …, rn} -> {col1, col2, …, coln}]
RadialGradientFilling[{r1, r2, …, rn} -> {col1, col2, …, coln}, {x, y}]
RadialGradientFilling[{r1, r2, …, rn} -> {col1, col2, …, coln}, {{x, y}, {r1, r2}}]
RadialGradientFilling[{r1, r2, …, rn} -> {col1, col2, …, coln}, {{x, y}, {r1, r2}}, padding]