Logo Arts

Primitive	Action
Key? ReadCharacter	Return true if a key has been pressed, then resets to false. Return unicode value of last keyboard key pressed, else wait.
Mouse? ReadMouse MousePos	Return true if mouse moved or button pressed. Return value of last mouse button pressed (0 1 2), else wait. Return position of mouse, [xx yy].
Character n UniCode "char	Return character whose unicode value is n. Return unicode value of character "char.
Message [abc] Read [abc] "x	Display message abc in a window. OK button to close. Display message abc. Read user input and assign to variable :x.
Trace StopTrace	Start Trace (debugging) mode. Stop Trace mode.

Note

1. ReadMouse returns 0 if the mouse has moved. Returns 1 on release of left mouse button. Returns 3 for release of right mouse button.
2. Shortform for Message is Msg.