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241 lines (225 loc) · 6.83 KB
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// Rover Object
// ======================
var rover = {
direction: 'N',
xPos: 0,
yPos: 0,
travelLog: []
}
// Mars, a 10 x 10 grid
// ======================
var mars = [
[null, null, null, null, null, null, null, null, null, null ],
[null, null, null, null, null, null, null, null, null, null ],
['X', null, null, null, null, null, null, null, null, null ],
[null, null, null, null, null, null, null, null, null, null ],
[null, null, null, null, null, null, null, null, null, null ],
[null, null, null, null, null, null, null, null, null, null ],
[null, null, null, null, null, null, null, null, null, null ],
[null, null, null, null, null, null, null, null, null, null ],
[null, null, null, null, null, null, null, null, null, null ],
[null, null, null, null, null, null, null, null, null, null ]
];
// ======================
function turnLeft(rover){
switch (rover.direction) {
case 'N':
rover.direction ='W';
console.log('Rover turns left towards ' + rover.direction );
break;
case 'W':
rover.direction = 'S';
console.log('Rover turns left towards ' + rover.direction );
break;
case 'S':
rover.direction = 'E';
console.log('Rover turns left towards ' + rover.direction );
break;
case 'E':
rover.direction = 'N';
console.log('Rover turns left towards ' + rover.direction );
break;
}
}
function turnRight(rover){
switch (rover.direction) {
case 'N':
rover.direction ='E';
console.log('Rover turns right towards ' + rover.direction );
break;
case 'E':
rover.direction = 'S';
console.log('Rover turns right towards ' + rover.direction );
break;
case 'S':
rover.direction = 'W';
console.log('Rover turns right towards ' + rover.direction );
break;
case 'W':
rover.direction = 'N';
console.log('Rover turns right towards ' + rover.direction );
break;
}
}
function moveForward(rover){
switch (rover.direction) {
case 'N':
if (rover.yPos>0 && !hitObstacle(rover.xPos,rover.yPos-1)) {
rover.yPos--;
writeTravelLog(rover);
console.log('Rover moves forward [' + rover.xPos + ',' + rover.yPos + ']');
//console.log('Rover moves forward to (' + rover.xPos + ','+ rover.yPos +')');
} else {
console.log('Rover can\'t move forward');
}
break;
case 'E':
if (rover.xPos<9 && !hitObstacle(rover.xPos+1,rover.yPos)) {
rover.xPos++;
writeTravelLog(rover);
console.log('Rover moves forward [' + rover.xPos + ',' + rover.yPos + ']');
//console.log('Rover moves forward to (' + rover.xPos + ','+ rover.yPos +')');
} else {
console.log('Rover can\'t move forward');
}
break;
case 'S':
if (rover.yPos<9 && !hitObstacle(rover.xPos,rover.yPos+1)) {
rover.yPos++;
writeTravelLog(rover);
console.log('Rover moves forward [' + rover.xPos + ',' + rover.yPos + ']');
//console.log('Rover moves forward to (' + rover.xPos + ','+ rover.yPos +')');
} else {
console.log('Rover can\'t move forward');
}
break;
case 'W':
if (rover.xPos>0 && !hitObstacle(rover.xPos-1,rover.yPos)) {
rover.xPos--;
writeTravelLog(rover);
console.log('Rover moves forward [' + rover.xPos + ',' + rover.yPos + ']');
//console.log('Rover moves forward to (' + rover.xPos + ','+ rover.yPos +')');
} else {
console.log('Rover can\'t move forward');
}
break;
}
}
function moveBackward(rover){
switch (rover.direction) {
case 'N':
if (rover.yPos<9 && !hitObstacle(rover.xPos,rover.yPos+1)) {
rover.yPos++;
writeTravelLog(rover);
console.log('Rover moves backward [' + rover.xPos + ',' + rover.yPos + ']');
} else {
console.log('Rover can\'t move backward');
}
break;
case 'E':
if (rover.xPos>0 && !hitObstacle(rover.xPos-1,rover.yPos)) {
rover.xPos--;
writeTravelLog(rover);
console.log('Rover moves backward [' + rover.xPos + ',' + rover.yPos + ']');
} else {
console.log('Rover can\'t move backward');
}
break;
case 'S':
if (rover.yPos>0 && !hitObstacle(rover.xPos,rover.yPos-1)) {
rover.yPos--;
writeTravelLog(rover);
console.log('Rover moves backward [' + rover.xPos + ',' + rover.yPos + ']');
} else {
console.log('Rover can\'t move backward');
}
break;
case 'W':
if (rover.xPos<9 && !hitObstacle(rover.xPos+1,rover.yPos)) {
rover.xPos++;
writeTravelLog(rover);
console.log('Rover moves backward [' + rover.xPos + ',' + rover.yPos + ']');
} else {
console.log('Rover can\'t move backward');
}
break;
}
}
function moveAround(commandList, roverId) {
resetRover(rover);
locateLastPosition(roverId);
var isValid = isValidCommandList(commandList);
if (isValid) {
for(i=0;i<commandList.length;i++) {
switch (commandList[i]) {
case 'f':
moveForward(rover);
break;
case 'b':
moveBackward(rover);
break;
case 'r':
turnRight(rover);
break;
case 'l':
turnLeft(rover);
break;
}
}
mars[rover.xPos][rover.yPos] = roverId;
printTravelLog(rover);
}
}
function resetRover(rover) {
rover.travelLog = [];
rover.xPos = 0;
rover.yPos = 0;
rover.direction = 'N';
}
function writeTravelLog(rover) {
rover.travelLog.push([rover.xPos,rover.yPos]);
}
function printTravelLog(rover) {
for (i=0; i<rover.travelLog.length;i++) {
console.log('Position: '+ rover.travelLog[i]);
}
}
function isValidCommandList(cl) {
for (i=0; i < cl.length; i++) {
if ( cl[i]==='l' || cl[i]==='r' || cl[i]==='f' || cl[i]==='b') {
continue;
} else {
console.log("The list of commands contains an invalid character. Commands must be 'l', 'r', 'f' or 'b'");
return false;
}
}
return true;
}
function hitObstacle(x,y){
var nextPosition = mars[x][y];
if (nextPosition === null ) {
return false;
} else {
console.log('Rover has hit an obstacle and can\'t move');
return true;
}
}
function locateLastPosition(id) {
for (var i = 0; i < mars.length; i++){
// A single row, such as mars[0], mars[1], mars[2]
var row = mars[i];
// Loop over each element in the row
// We use "j" because "i" is already being used.
// What would happen if we used i in this loop instead? Try it.
for (var j = 0; j < row.length; j++){
var column = row[j];
// If the column is a rover, log the coords
if (column === id){
console.log("Rover Found at: " + i + ", " + j);
rover.xPos = i;
rover.yPos = j;
}
// Instead of using variables, you could reference: mars[i][j]
}
}
}