Sets the values of the passed channels into a Color
| this |
A pointer to a Color to initialize |
| red |
value of the red channel, between 0 and 1.0 |
| green |
value of the green channel, between 0 and 1.0 |
| blue |
value of the blue channel, between 0 and 1.0 |
| alpha |
value of the alpha channel, between 0 and 1.0 |