%Author:MysticAngel
%Date:March 2,2003
%Purpose:The program will move a "turtle" around on the screen in
%response to four commands.
%Input:The user will input a set of commands to the turtle
%Output:the movement of the turtle

    var iWindow, iWindow1 : int
    var sDirection : string
    var iStep, x, y, x2, y2, iDir : int := 0
    var sMove : string (1)
    iWindow := Window.Open ("grahics:500;500")
        colorback(black)
        cls
        color(brightgreen)
    iWindow1 := Window.Open ("graphics:500;500")
        colorback(black)
        cls
        color(brightgreen)
    x := 150
    y := 150
    iDir := 90
    Window.Select (iWindow)
    Draw.Dot (x, y,brightgreen)
    loop
        Window.Select (iWindow1)
        if iDir = - 90 then
            iDir := 270
        end if
            if iDir = 360 then
                iDir := 0
            end if
            cls
                if iDir = 0 then
                    sDirection := "e"
                    put ""
                    put "The turtle is facing the East direction"
                elsif iDir = 180 or iDir = - 180 then
                    sDirection := "w"
                    put ""
                    put "The turtle is facing the West direction"
                elsif iDir = 90 then
                    sDirection := "n"
                    put ""
                    put "The turtle is facing the North direction"
                else
                    sDirection := "s"
                    put ""
                    put "The turtle is facing the South direction"
                end if
    Window.Select (iWindow1)
        put""
        put "To move Left(L), move Right(R), move Forward(F), and to Quit(Q)"
        put "What movement do you want the turtle to do?"
        getch (sMove)
    if sMove = "R" or sMove = "r" then
        iDir := iDir - 90
    elsif sMove = "l" or sMove = "L" then
        iDir := iDir + 90
    elsif sMove = "f" or sMove = "F" then
        Window.Select (iWindow1)
        put""
        put "How many step do you want the turtle to move"
        get iStep
        Window.Select (iWindow)
        if sDirection = "n" then
            x2 := x
            y2 := y + iStep
            Draw.Line (x, y, x2, y2, brightgreen)
            x := x2
            y := y2
        elsif sDirection = "s" then
            x2 := x
            y2 := y - iStep
            Draw.Line (x, y, x2, y2, brightgreen)
            x := x2
            y := y2
        elsif sDirection = "e" then
            y2 := y
            x2 := x + iStep
            Draw.Line (x, y, x2, y2, brightgreen)
            x := x2
            y := y2
        else
           y2 := y
           x2 := x - iStep
            Draw.Line (x, y, x2, y2, brightgreen)
            x := x2
            y := y2
        end if
    end if
    exit when sMove ="q" or sMove = "Q"
end loop
Window.Close(iWindow)
Window.Close(iWindow1)

% Name: PrInCe_
% Date: Mar. 26, 2003
% Purpose: Draws a "turtle" and moves it around the
%          screen based on the users commands
% Inputs: Direction (direction), Distance (distance), User Command
%         (command)
% Output: Turtle's movements shown on the "turtle window"

% fuction getCommand
% purpose: Gets the command from the user
% parameters: key
% return value: key

function getCommand : string (1)
    var key : string (1)
    put "What would you like to do? " ..
    getch (key)
    result key
end getCommand

% procedure goLeft
% purpose: changes the direction of the turtle to make it go left
% input parameters: none
% output parameters: none

procedure goLeft (var direction : int)
    delay (500)
    direction := direction + 90
    if direction >= 360 then
        direction := 0
    end if
end goLeft

% procedure goRight
% purpose: changes the direction of the turtle to make it go right
% input parameters: none
% output parameters: none

procedure goRight (var direction : int)
    delay (500)
    direction := direction - 90
    if direction = - 90 then
        direction := 270
    end if
end goRight

% procedure goForward
% purpose: moves the turtle forward depending on the direction being faced
%          and the distance determined by the user
% input parameters: distance
% output parameters: none

procedure goForward (var x, y, win1, direction : int)
    var distance : int
    loop
        locate (7, 1)
        put "How far would you like to go ? " ..
        get distance
        exit when distance >= 0
        locate (7, 31)
        put "                             "
    end loop
    Window.Select (win1)
    if direction = 270 then
        Draw.Line (x, y, x + distance, y, black)
        x := x + distance
    elsif direction = 90 then
        Draw.Line (x, y, x - distance, y, black)
        x := x - distance
    elsif direction = 180 then
        Draw.Line (x, y, x, y - distance, black)
        y := y - distance
    else
        Draw.Line (x, y, x, y + distance, black)
        y := y + distance
    end if
end goForward

% procedure quitProgram
% purpose: closes the program when the user decides to quit
% input parameters: none
% output parameters: none

procedure quitProgram (var win1, win2 : int)
    Window.Close (win1)
    Window.Select (win2)
    Window.Close (win2)
    Window.Select (0)
end quitProgram



% ---------- Main ----------

var direction : int := 0
var x, y : int
var command : string (1)
var win1, win2 : int

% turtle window
win1 :=
    Window.Open ("graphics:1013;550,position:0;0,,noecho,nocursor,title:Turtle Window")

% command window
win2 := Window.Open ("graphics:1013;155,position:0;590,title:Command Window")


colorback (53)
cls
Window.Select (win2)

x := 506
y := 275

Window.Select (win1)
colorback (brightgreen)
cls

loop
    Window.Select (win2)
    cls
    put "This turtle obeys only 4 commands"
    put "f - go forward"
    put "r - turn right"
    put "l - turn left"
    put "q - quit"
    command := getCommand
    if command = "l" or command = "L" then
        goLeft (direction)
    elsif command = "r" or command = "R" then
        goRight (direction)
    elsif command = "f" or command = "F" then
        goForward (x, y, win1, direction)
    elsif command = "q" or command = "Q" then
        quitProgram (win1, win2)
    end if
    exit when command = "q" or command = "Q"
end loop