Penrose Tile

Add a new kite to the canvas. Enable only when there is not working piece.
Add a new dart to the canvas. Enable only when there is not working piece.
Rotate the working piece counter-clockwise or clockwise. You can also use the right-arrow/left-arrow key to rotate the working piece.
Delete working piece.
Incrase/decrease piece size
Delete all pieces on the canvas and start over.
Download the pattern. Because JavaScript cannot write to you computer, you need to copy the data and save that to a text file yourself.
Upload the pattern you saved or upload from one of existing patterns.
Select a color, after you have select color, double click on the settled piece to change the color. Click this icon again to diable color selection.
Change canvas size, default tile color, arc color.
Hint
You can only work on one piece at a time.
For the first one, double click the piece to settle it.
When all pieces are settled, double click one on the border would take it out and make it workable. You can only take out the piece that is on the border.
When you rotate working piece, the border color would change indicate the matching edges. Move the piece closeer to the macthed piece to fit it into settle pattern.