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rover.js
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rover.js
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var rover1 = {
position: [5, 0],
direction: 'N'
};
var rover2 = {
position: [9, 5],
direction: 'W'
};
//Matriz:
var grid = new Array(10);
for(var i=0;i<10;i++){
grid[i]=new Array(10);
}
//Obstaculos
grid[9][2]=1;
grid[2][0]=1;
grid[2][6]=1;
grid[3][9]=1;
grid[4][0]=1;
//Message
var message ="lfffffffff";
//mensaje en el que ambos rovers encuentran obstaculos: lfffffff
//mensaje en el que rover1 choca con rover2 fffffff
//Funciones de movimiento. Reciben el objeto con la pos. actual y escriben en el objeto la nueva posicion.
function goForward(rover) {
switch(rover.direction) {
case 'N':
rover.position[1]++;
break;
case 'E':
rover.position[0]++;
break;
case 'S':
rover.position[1]--;
break;
case 'W':
rover.position[0]--;
break;
}
//wrap horizontal
if (rover.position[0]===10) {
rover.position[0]=0;
} else if (rover.position[0]===-1) {
rover.position[0]=9;
}
//wrap vertical
if (rover.position[1]===10) {
rover.position[1]=0;
} else if (rover.position[1]===-1) {
rover.position[1]=9;
}
}
function goBackwards(rover) {
switch(rover.direction) {
case 'N':
rover.position[1]--;
break;
case 'E':
rover.position[0]--;
break;
case 'S':
rover.position[1]++;
break;
case 'W':
rover.position[0]++;
break;
}
//wrap horizontal
if (rover.position[0]===10) {
rover.position[0]=0;
} else if (rover.position[0]===-1) {
rover.position[0]=9;
}
//wrap vertical
if (rover.position[1]===10) {
rover.position[1]=0;
} else if (rover.position[1]===-1) {
rover.position[1]=9;
}
}
function turnLeft(rover) {
switch(rover.direction) {
case 'N':
rover.direction="W";
break;
case 'E':
rover.direction="N";
break;
case 'S':
rover.direction="E";
break;
case 'W':
rover.direction="S";
break;
}
}
function turnRight(rover) {
switch(rover.direction) {
case 'N':
rover.direction="E";
break;
case 'E':
rover.direction="S";
break;
case 'S':
rover.direction="W";
break;
case 'W':
rover.direction="N";
break;
}
}
function nextPosition(command, rover){
var nextRover = JSON.parse(JSON.stringify(rover));
switch (command) {
case 'f':
goForward(nextRover);
break;
case 'b':
goBackwards(nextRover);
break;
case 'r':
turnRight(nextRover);
break;
case 'l':
turnLeft(nextRover);
break;
default:
console.log(" Error, command not recognized. Moving on to next command.");
}
return nextRover;
}
//Info inicial
console.log("Rover 1 starts in position [" + rover1.position[0] + ", " + rover1.position[1] + "] - " + rover1.direction);
console.log("Rover 2 starts in position [" + rover2.position[0] + ", " + rover2.position[1] + "] - " + rover2.direction);
console.log("Message sent to rovers: " + message);
//Ejecucion de la cadena de messages
var rover1Freeze = 0;
var rover2Freeze = 0;
for(var i=0; i<message.length; i++){
console.log("Executing command number " + i + " (" +message[i]+") ");
//Rover 1 moves
if(rover1Freeze===0){
var nextRover1 = nextPosition(message[i], rover1);
console.log(" Rover 1 wants to move to " + nextRover1.position + " - " + nextRover1.direction);
if (grid[nextRover1.position[0]][nextRover1.position[1]]===1) {
console.log(" Rover 1 found an obstacle. Last valid position was " + rover1.position);
rover1Freeze = 1;
}else if(grid[nextRover1.position[0]][nextRover1.position[1]]==="rover2"){
console.log(" Rover 1 bumped into Rover 2. End of movements. Last valid position was " + rover1.position);
break;
}else{
grid[rover1.position[0]][rover1.position[1]]="0";
grid[rover1.position[0]][rover1.position[1]]="rover1";
rover1 = nextRover1;
console.log(" Rover 1 moved successfully!");
}
}
//Rover 2 moves
if(rover2Freeze===0){
var nextRover2 = nextPosition(message[i], rover2);
console.log(" Rover 2 wants to move to " + nextRover2.position + " - " + nextRover2.direction);
if (grid[nextRover2.position[0]][nextRover2.position[1]]===1) {
console.log(" Rover 2 found an obstacle. Last valid position was " + rover2.position);
rover2Freeze = 1;
}else if(grid[nextRover2.position[0]][nextRover2.position[1]]==="rover1"){
console.log(" Rover 1 bumped into Rover 2. End of movements. Last valid position was " + rover1.position);
break;
}else{
grid[rover2.position[0]][rover2.position[1]]="0";
grid[rover2.position[0]][rover2.position[1]]="rover2";
rover2 = nextRover2;
console.log(" Rover 2 moved successfully!");
}
}
if(rover1Freeze===1 && rover2Freeze===1){
console.log("Both rovers have encountered obstacles, end of movements");
break;
}
}
console.log("Rover 1 final position is " + rover1.position + " - " + rover1.direction);
console.log("Rover 2 final position is " + rover2.position + " - " + rover2.direction);