)
Sets the color used for stroking shapes.
r, g, b are 0-255, a is 0-1.
Source
/**
* Sets the color used for stroking shapes.
* [r], [g], [b] are 0-255, [a] is 0-1.
*/
void setStrokeColorRgb(int r, int g, int b, [num a = 1]) {
this.strokeStyle = 'rgba($r, $g, $b, $a)';
}