js贪吃蛇

function init() {                

            w = 40; m = 20; d = w * m / 2; food = null;            

            dm = new ht.DataModel();            

            g3d = new ht.graph3d.Graph3dView(dm);                

            g3d.setGridVisible(true);

            g3d.setGridColor('#29B098');

            g3d.setGridSize(m);

            g3d.setGridGap(w);            

            view = g3d.getView();            

            view.className = 'main';

            document.body.appendChild(view);    

            window.addEventListener('resize', function (e) {  g3d.invalidate(); }, false);                                                                                            

            g3d.sm().setSelectionMode('none');

            view.addEventListener(ht.Default.isTouchable ? 'touchstart' : 'mousedown', function(e){                

                if(isRunning){

                    var p = g3d.getHitPosition(e);

                    if(Math.abs(p[0]) < d && Math.abs(p[2]) < d){

                        if(direction === 'up' || direction === 'down'){

                            direction = p[0] > snake[0].p3()[0] ? 'right' : 'left';                       

                        }

                        else if(direction === 'left' || direction === 'right'){

                            direction = p[2] > snake[0].p3()[2] ? 'down' : 'up';                                             

                        }                        

                    }

                }else if(ht.Default.isDoubleClick(e)){

                    start();    

                }                

            }, false);                        

            start();            

            setInterval(function(){ if(isRunning){ isRunning = next(); } }, 200);

        }                

        function start(){

            dm.clear(); snake = []; score = 0; direction = 'up'; isRunning = true;

            shape = new ht.Shape();

            shape.setPoints(new ht.List([

                {x: -d, y: d},

                {x: d, y: d},

                {x: d, y: -d},

                {x: -d, y: -d},

                {x: -d, y: d}

            ]));

            shape.setThickness(4);

            shape.setTall(w);

            shape.setElevation(w/2);

            shape.s({'all.color': 'rgba(20, 120, 120, 0.5)', 'all.transparent': true, 'all.reverse.cull': true});

            dm.add(shape);                         

            for(var i=0; i<m/2; i++) { snake.push(createNode(m/2 + i, m/2)); }            

            createFood();                        

        }        

        function createNode(x, y){

            var node = new ht.Node();

            node.a({ x: x,  y: y });

            node.s3(w*0.9, w*0.9, w*0.9);

            node.p3(-w*m/2+w*x+w/2, w/2, -w*m/2+w*y+w/2);

            dm.add(node);

            return node;

        }        

        function getRandom(){

            return parseInt(Math.random() * m);

        }        

        function createFood(){

            var x = getRandom(), y = getRandom();

            while(touchFood(x, y) || touchSnake(x, y)){ x = getRandom(); y = getRandom(); }

            if(food) dm.remove(food);            

            food = createNode(x, y); 

            food.s({'shape3d': 'sphere',  'shape3d.color': 'red'});

        }        

        function touchSnake(x, y){

            for(var i=0; i<snake.length; i++){                

                if(snake[i].a('x') === x && snake[i].a('y') === y){ return true; }

            }

            return false;

        }        

        function touchFood(x, y){

            return food && food.a('x') === x && food.a('y') === y;

        }        

        function next(){

            var node = snake[0], x = node.a('x'), y = node.a('y');

            if(direction === 'up') y--;

            if(direction === 'down') y++;       

            if(direction === 'left') x--;

            if(direction === 'right') x++;

            if(x < 0 || x >= m || y < 0 || y >= m || touchSnake(x, y)){ return false; }                        

            if(touchFood(x, y)){

                score++;                

                snake.splice(0, 0, createNode(x, y));                

                createFood();

            }else{

                snake.splice(0, 0, createNode(x, y));

                dm.remove(snake.pop());                

            }

            return true;

        }

        

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