Package slogo.instruction

Class Summary

Class	Description
Addition	Represents a + b, the addition of two expressions
ArithmeticInstruction	The base class of all arithmetic instruction, the evaluate method uses the hook/template method value to return a Double value, the template method returns a double.
Assignment	An assignment instruction assigns an expression to a variable, updating the global state to reflect the assignment.
Backward	Moves the turtle backwards by the amount specified
BinaryExpression	The base class of any binary expression, e.g., a + b, a - b, or, in future use, a < b and so on.
Clean	Clears the drawing area (the turtle's statistics do not reset)
ClearScreen	Erases the drawing area and sends the turtle to the home position (Like CLEAN and HOME)
Division	Represents a / b, the division of two expressions
FD	Moves the turtle forward by dist pixels
Heading	Returns the turtle's heading in degrees
HideTurtle	Makes the turtle invisible
Home	Moves the turtle to the center of the screen (0 0)
If	An AST (abstract syntax tree) for a SLogo REPEAT instruction.
Instruction	Represents an instruction in the SLogo language
IsEqual	Returns 1 if the two inputs are equal, 0 otherwise
IsGreater	Returns 1 if its first input is strictly greater than its second, or 0 otherwise
IsLess	Returns 1(:TRUE) if its first input is strictly less than its second, or 0 otherwise (:FALSE)
IsNotEqual	Returns 1 if the two inputs are not equal, 0 otherwise
Left	Turns the turtle counterclockwise by the specified angle
Multiplication	Represents a x b, the multiplication of two expressions
Negation	Represents unary minus, e.g., MINUS num OR -expression
PenDown	Sets the pen's position to DOWN
PenDownP	Returns 1 (:TRUE) if the pen is down, 0 (:FALSE) if it's up.
PenUp	Sets the pen's position to UP
Print	The Print instruction prints an expression.
Quotient	Represents a / b, the division of two expressions
Remainder	Represents a % b, the division of two expressions
Repeat	An AST (abstract syntax tree) for a SLogo REPEAT instruction.
Right	Turns the turtle clockwise by the specified angle
Setx	Moves the turtle horizontally to a new absolute horizontal coordinate
Setxy	Moves the turtle to an absolute screen position.
Sety	Moves the turtle vertically to a new absolute vertical coordinate
ShowTurtle	Makes the turtle visible
StrictInstructionList	A list of instructions that doesn't include a function definition.
Subtraction	Represents a subtraction (e.g., lhs - rhs)
To
Towards	Changes the heading of the turtle to point in the direction of given coordinates
UnaryExpression	Represents a unary expression
XCor	Determines the X Coordinate of the turtle
YCor	Determines the Y Coordinate of the turtle