FMSLogo provides both traditional and extended Logo turtle graphics. Multiple turtles are supported but dynamic turtles and collision detection are not supported.
The center of the graphics surface (which may not be the center of the screen window, depending on how it is scrolled) is turtle location [0 0]. Positive X is to the right; positive Y is up. Headings (angles) are measured in degrees clockwise from the positive Y axis. (This differs from the common mathematical convention of measuring angles counterclockwise from the positive X axis.) The turtle is represented as an isosceles triangle; the actual turtle position is at the midpoint of the base (the long side).
FMSLogo begins with a white background and black pen.
FMSLogo supports color-by-index, color-by-name, and true color. See Using Color for details.