我用processign.js做了一个蛇游戏，我试图与自己发生冲突。问题在于它无法正常工作。
. ~/.bashrc # Make the changes apply to the current session
问题出在var screen = 0;
var bg = color(60,150,60);
var snake;
var apple;
var bonus;
var nBonus = 0;
var gameOver = false;
var appleSize = 10;
var applePosX = round(random(10,width-appleSize)/10)*10;
var applePosY = round(random(10,height-appleSize)/10)*10;
var keys = [];
void keyPressed() {
keys[keyCode] = true;
};
void keyReleased() {
keys[keyCode] = false;
};
frameRate(10);
// collision with itself
// -----------------------------------------------------------------------
// ------------------------------- THE SNAKE -----------------------------
var Snake = function(x, y) {
this.x = x;
this.y = y;
this.len = 1;
this.size = 10;
this.snakePosX = 0;
this.snakePosY = 0;
this.points = 0;
this.positions = [];
this.moving = false;
this.apples = 0;
for(var i=0; i<this.len; i++) {
var posX = this.x-i*10;
var posY = this.y;
this.positions[i] = {x:posX, y:posY};
}
};
Snake.prototype.draw = function() {
fill(0);
stroke(255,255,255);
for(var i=0; i<this.positions.length; i++) {
rect(this.positions[i].x, this.positions[i].y, this.size, this.size);
}
};
Snake.prototype.move = function() {
if(gameOver === false) {
if(keys[UP]) {
this.snakePosY = -this.size;
this.snakePosX = 0;
this.moving = true;
}
if(keys[DOWN]) {
this.snakePosY = this.size;
this.snakePosX = 0;
this.moving = true;
}
if(keys[LEFT]) {
this.snakePosX = -this.size;
this.snakePosY = 0;
this.moving = true;
}
if(keys[RIGHT]) {
this.snakePosX = this.size;
this.snakePosY = 0;
this.moving = true;
}
}
if(this.moving == true) {
if(snake.positions.length == 1) {
this.positions[0].x += this.snakePosX;
this.positions[0].y += this.snakePosY;
}
else {
for(var i=1; i<this.positions.length; i++) {
this.positions[i-1].x = this.positions[i].x;
this.positions[i-1].y = this.positions[i].y;
this.positions[i].x += this.snakePosX;
this.positions[i].y += this.snakePosY;
}
}
}
};
Snake.prototype.checkColl = function() {
// collision with itself
if(this.positions.length>1) {
for(var i=0; i<this.positions.length; i++) {
if(this.positions[0].x > 350) {
text('holly crap', 100, 100);
}
}
}
// collision with walls
if(this.positions[0].x > width-this.size || this.positions[0].x < 0 || this.positions[0].y > height-this.size || this.positions[0].y < 0) {
gameOver = true;
gameIsOver();
}
// collision with apples
for(var i=0; i<this.positions.length; i++) {
if(this.positions[i].x >= apple.x && this.positions[i].x+10 <= apple.x+10 && this.positions[i].y >= apple.y && this.positions[i].y+10 <= apple.y+10) {
apple.draw();
this.apples ++;
this.points += 10;
this.positions.unshift({x:apple.x, y:apple.y});
apple.x = round(random(10,width-appleSize)/10)*10;
apple.y = round(random(10,height-appleSize)/10)*10;
if(this.apples > 1 && this.apples % 5 == 0) {
nBonus = 1;
}
}
}
// collision with bonus
if(this.positions[0].x >= bonus.x && this.positions[0].x+10 <= bonus.x+10 && this.positions[0].y >= bonus.y && this.positions[0].y+10 <= bonus.y+10) {
if(this.moving) {
bonus.x = round(random(10,width-appleSize)/10)*10;
bonus.y = round(random(10,height-appleSize)/10)*10;
nBonus = 0;
this.points += 10;
}
}
};
// ------------------------ THE APPLES -----------------------------------
var Apple = function(x, y) {
this.x = x;
this.y = y;
};
Apple.prototype.draw = function() {
fill(255,0,0);
noStroke();
rect(this.x, this.y, appleSize, appleSize);
};
// ------------------------ THE BONUS -----------------------------------
var Bonus = function(x, y) {
this.x = x;
this.y = y;
}
Bonus.prototype.draw = function() {
fill(150,0,0);
stroke(255,255,255)
rect(this.x, this.y, appleSize, appleSize);
};
// -----------------------------------------------------------------------
snake = new Snake(width/2, height/2);
apple = new Apple(applePosX, applePosY);
bonus = new Bonus(width/2, height/2);
// -----------------------------------------------------------------------
void gameIsOver() {
fill(0);
textAlign(CENTER);
text("Game Over\nPress 'S' to play again", width/2, height/2);
textAlign(LEFT);
if(keys[83]) {
screen = 2;
gameOver = false;
}
}
void playGame() {
if(screen === 0) {
if(mouseX >= width/2-50 && mouseY <= width/2+50 && mouseY >= height/2-15 && mouseY <= height/2+15) {
if(mousePressed) {
screen = 1;
}
}
}
}
void makeScreen() {
if(screen === 0) {
textAlign(CENTER);
textSize(30);
text('SNAKE GAME', width/2, 100);
stroke(255,255,255);
noFill();
rectMode(CENTER);
rect(width/2, height/2, 100, 30);
textSize(15);
text('Play', width/2, height/2+5);
textSize(11);
text('By Eskimopest', width/2, height-20);
textAlign(LEFT);
rectMode(LEFT);
playGame();
}
if(screen === 1) {
snake.draw();
snake.move();
snake.checkColl();
apple.draw();
if(nBonus === 1) {
bonus.draw();
}
fill(0);
text('POINTS : '+ snake.points, 10, 20);
text('APPLES : '+ snake.apples, 10, 40);
}
if(screen === 2) {
snake.points = 0;
snake.apples = 0;
snake.x = width/2;
snake.y = height/2;
snake.len = 1;
snake.positions = [{x:snake.x, y:snake.y}];
snake.snakePosX = 0;
snake.snakePosY = 0;
applePosX = round(random(10,width-appleSize)/10)*10;
applePosY = round(random(10,height-appleSize)/10)*10;
screen = 1;
}
}
// -----------------------------------------------------------------------
void draw() {
background(bg);
makeScreen();
for(var i=0; i<snake.positions.length; i++) {
text(i + 'x:'+snake.positions[i].x + ' y:'+snake.positions[i].y, 600, 20+i*10);
}
}
，我正在努力使这项工作但没有结果。当我尝试制作
snake.prototype.checkColl答案 0 :(得分：0)
应该是：
if(this.positions[0].x == this.positions[i].x)
使用单个=正在进行分配。您想要进行比较，因此您需要加倍==。