gc:setColorRGB(red, green, blue)
gc:setColorRGB(0xRRGGBB) -- API Level > '1.0'
Sets the color for subsequent draw and fill routines. The red, green, and
blue components of the color are values in the range of 0 to 255. Black is 0,0,0
and white is 255,255,255. Alternately, a single value can be passed in. The
components of this single value are blue + 255 * (green + 255
* red).
Introduced in platform.apiLevel = '1.0'
Extended in platform.apiLevel = ‘2.0’