Pen Blocks

Pen blocks are used to draw animation in Music Blocks projects

	Set color of the line drawn by the mouse (hue, shade, and grey).
	Set grey level of the line drawn by the mouse (grey is vividness or saturation).
	Set shade of the line drawn by the mouse (shade is lightness, e.g., black, grey, white).
	Set hue of the line drawn by the mouse (hue is the spectral color, e.g., red, orange, yellow, green, blue, purple, etc.).
	Set size of the line drawn by the mouse.
	Mouse will draw when moved.
	Mouse will not draw when moved.
	Draw filled polygon.
	Set pen attribute to hollow line mode (useful for working with 3D printers).
	Set the background color.
	Set the font of the text drawn with Show Block.
	Current pen size (can be used in place of a number block).
	Current grey level (can be used in place of a number block).
	Current pen shade (can be used in place of a number block).
	Current pen color (can be used in place of a number block).