setStrokeColorHsl method
Sets the color used for stroking shapes.
h is in degrees, 0-360.
s, l are in percent, 0-100.
a is 0-1.
Implementation
void setStrokeColorHsl(int h, num s, num l, [num a = 1]) {
this.strokeStyle = 'hsla($h, $s%, $l%, $a)';
}