** Draw simple shapes into a Typed Array as a 2d image.**
Four funcitons are exported:
- drawBox(buffer, width, x, y, h, w, rot, color, rop)
- drawCircle(buffer, width, x, y, rad, color, rop)
- drawPolygon(buffer, width, points, color, rop)
- drawEllipse(buffer, width, x, y, h, w, rot, color, rop)
Arguments:
- buffer - a TypedArray of data to draw into.
- width - the width of the first dimension buffer.
- x, y - center position of the shape to draw.
- h, w - height and width of the shape.
- color - value or "color" to draw.
- rop - raster operation to perform, either set or add. If undefined "set" is the default.