Test/snake.html at master · Frozenmad/Test · GitHub

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<!DOCTYPE html>
<html>
<head>
<style type="text/css">
	svg{
		float: left;
	}
	div{
		float: none;
	}
</style>
	<title>Snake</title>
<script src="https://d3js.org/d3.v4.min.js"></script>
</head>
<body>
<svg id='main' width=800 height=600 viewBox='0 0 800 600'></svg>
<script type="text/javascript">
var svg = d3.select("#main");
var height = 600,
	width = 800,
	padding = 20;
var cData = (h,w,x,y) => ({h:h,w:w,x:x,y:y});
var cDataFromIndex = (a,b) => ({h:padding,w:padding,x:a*padding,y:b*padding});
var total = {x:width/padding,y:height/padding};
var boolArr = [];
var getItem = (a,b) => (a+b*total.x);
var parseItem = (index) => ({iy:parseInt(index/total.x),ix:index-parseInt(index/total.x)*total.x});
var sData = (x,y) => ({ix:x,iy:y});
for(var i=0;i<total.y;i++)
	for(var j=0;j<total.x;j++)
		boolArr.push(cData(padding,padding,padding*j,padding*i));

function createRect(father,cData,color){
	return father.append('rect')
		.attr('x',cData.x)
		.attr('y',cData.y)
		.attr('width',cData.w)
		.attr('height',cData.h)
		.attr('fill',color)
}

function createCircle(father,data,color,name){
	name = name || 'circle'
	color = color || 'blue'
	return father.append('circle')
		.attr('id',name+getItem(data.ix,data.iy))
		.attr('cx',data.ix*padding+padding/2)
		.attr('cy',data.iy*padding+padding/2)
		.attr('r',8)
		.attr('fill',color)
}

function deleteCircle(father,ix,iy,name){
	name = name || 'circle'
	father.select('#'+name+getItem(ix,iy)).remove();
}

var block = new Array();
for(var i=0;i<total.x*total.y;i++) block.push(true);

for(var i=0;i<total.x;i++){
	block[getItem(i,0)] = false;
	block[getItem(i,total.y-1)] = false;
}

for(var j=1;j<total.y-1;j++){
	block[getItem(0,j)] = false;
	block[getItem(total.x-1,j)] = false;
}

function createBlock(i,j){
	block[getItem(i,j)] = false;
}

// create the map of block
createBlock(35,1)
createBlock(35,2)
createBlock(35,3)
createBlock(35,4)
createBlock(35,5)
createBlock(35,6)
createBlock(36,6)
createBlock(37,6)
createBlock(38,6)
createBlock(39,6)

// create the map of block randomly
function randIJ(){
	var i = parseInt(Math.random()*total.x);
	var j = parseInt(Math.random()*total.y);
	return sData(i,j);
}

function randBlock(num){
	for(var u=0;u<num;u++){
		var i = parseInt(Math.random()*total.x);
		var j = parseInt(Math.random()*total.y);
		createBlock(i,j);
	}
}

randBlock(20);

// draw the background with block
var background = svg.append('g');
background.selectAll('rect')
	.data(boolArr)
	.enter()
	.append('rect')
	.attr('x',function(d){return d.x})
	.attr('y',function(d){return d.y})
	.attr('width',function(d){return d.w})
	.attr('height',function(d){return d.h})
	.attr('fill',function(d,i){
		var index = parseItem(i);
		if(!block[i]) return 'black';
		return 'green';
	})
	.attr('stroke','black')
	.attr('stroke-width',0.5)

// create the food array
var food = new Array();
var foodMap = svg.append('g').attr('id','foodMap');
function addFood(ix,iy){
	food.push(getItem(ix,iy));
	createCircle(foodMap,sData(ix,iy),'blue','food');
}
function removeFood(index){
	var tD = parseItem(food[index]);
	food.splice(index,1);
	deleteCircle(foodMap,tD.ix,tD.iy,'food');
}
for(var i=0;i<3;i++) {
	var tmpData = randIJ();
	addFood(tmpData.ix,tmpData.iy);
}

// create the snake array
var snake = svg.append('g').attr('id','snake');
function showSnake(data){
	var tmp = data.map(function(d){return parseItem(d)});
	snake.selectAll('circle').remove();
	snake.selectAll('circle')
		.data(tmp)
		.enter()
		.append('circle')
		.attr('cx',function(d){return d.ix * padding + padding/2})
		.attr('cy',function(d){return d.iy * padding + padding/2})
		.attr('fill','red')
		.attr('r',padding/2-1)
		.attr('stroke','black')
		.attr('stroke-width',2)
}

// whether the game begin
var beginFlag;
// origin snake data
var snakeData = [getItem(4,4),getItem(4,5),getItem(4,6)];
// origin snake orientation
var orient = {x:1,y:0};

function initSnake(){
	snakeData = [getItem(4,4),getItem(4,5),getItem(4,6)];
	orient = {x:1,y:0};
	showSnake(snakeData);
}

initSnake();

// get and set the orientation
function sameOri(o1,o2){return o1.x==o2.x && o1.y == o2.y};

function changeData(){
	// function used to change data of snake and update them
	var head = parseItem(snakeData[0]);
	console.log(orient);
	var newHead = getItem(head.ix+orient.x,head.iy+orient.y);
	if(food.indexOf(newHead)==-1) snakeData.pop();
	else{
		removeFood(food.indexOf(newHead));
		var tmpFood = randIJ();
		addFood(tmpFood.ix,tmpFood.iy);
	}
	if(!block[newHead] || snakeData.indexOf(newHead)!=-1) {
		alert('you have died!');
		clearInterval(beginFlag);
		return;
	}
	snakeData.splice(0,0,newHead);
	showSnake(snakeData);
}

function begin(){
	initSnake();
	beginFlag = setInterval(changeData,500);
}

function end(){
	beginFlag = clearInterval(beginFlag);
}

// listen to the key event
document.onkeydown = function(event){
	var e = event || window.event || arguments.callee.caller.arguments[0];
	if(e && e.keyCode == 87){
		if(sameOri(orient,{x:0,y:-1}) || sameOri(orient,{x:0,y:1})) return;
		orient = {x:0,y:-1};
		changeData();
	}
	if(e && e.keyCode == 83){
		if(sameOri(orient,{x:0,y:-1}) || sameOri(orient,{x:0,y:1})) return;
		orient = {x:0,y:1};
		changeData();
	}
	if(e && e.keyCode == 65){
		if(sameOri(orient,{x:1,y:0}) || sameOri(orient,{x:-1,y:0})) return;
		orient = {x:-1,y:0};
		changeData();
	}
	if(e && e.keyCode == 68){
		if(sameOri(orient,{x:1,y:0}) || sameOri(orient,{x:-1,y:0})) return;
		orient = {x:1,y:0};
		changeData();
	}
}

var startBegin = {x:0,y:0};

d3.select(document)
	.on('touchstart',function(e){
		startBegin.x = d3.event.PageX;
		startBegin.y = d3.event.PageY;
	})
	.on('touchend',function(e){
		var xChange = d3.event.PageX - startBegin.x;
		var yChange = d3.event.PageY - startBegin.y;
		if(Math.abs(xChange) > Math.abs(yChange)){
			if(sameOri(orient,{x:1,y:0}) || sameOri(orient,{x:-1,y:0})) return;
			if(xChange > 0){
				orient = {x:1,y:0};
				changeData();
			}
			else{
				orient = {x:-1,y:0};
				changeData();
			}
		} else{
			if(sameOri(orient,{x:0,y:1}) || sameOri(orient,{x:0,y:-1})) return;
			if(yChange > 0){
				orient = {x:0,y:1};
				changeData();
			}
			else{
				orient = {x:0,y:-1};
				changeData();
			}
		}
	})

var newEl = svg.append('g');
var begins = createRect(newEl,cDataFromIndex(37,2),'red');
var ends = createRect(newEl,cDataFromIndex(37,4),'red');
begins.on("click",begin);
ends.on("click",end);

</script>
</body>
</html>