function executeContextStroke() {
      if(doStroke) {
        if(isStrokeDirty) {
          curContext.strokeStyle = p.color.toString(currentStrokeColor);
          isStrokeDirty = false;
        }
        curContext.stroke();
      }
    }
The stroke() function sets the color used to draw lines and borders around shapes. This color
is either specified in terms of the RGB or HSB color depending on the
current <b>colorMode()</b> (the default color space is RGB, with each
value in the range from 0 to 255).
<br><br>When using hexadecimal notation to specify a color, use "#" or
"0x" before the values (e.g. #CCFFAA, 0xFFCCFFAA). The # syntax uses six
digits to specify a color (the way colors are specified in HTML and CSS).
When using the hexadecimal notation starting with "0x", the hexadecimal
value must be specified with eight characters; the first two characters
define the alpha component and the remainder the red, green, and blue
components.
<br><br>The value for the parameter "gray" must be less than or equal
to the current maximum value as specified by <b>colorMode()</b>.
The default maximum value is 255.

@param {int|float} gray    number specifying value between white and black
@param {int|float} value1  red or hue value
@param {int|float} value2  green or saturation value
@param {int|float} value3  blue or brightness value
@param {int|float} alpha   opacity of the stroke
@param {Color} color       any value of the color datatype
@param {int} hex           color value in hexadecimal notation (i.e. #FFCC00 or 0xFFFFCC00)

@see #fill()
@see #noStroke()
@see #tint()
@see #background()
@see #colorMode()