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snake in d3
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| <html> | |
| <head> | |
| <title> it's a snake! </title> | |
| <link rel="stylesheet" href="snake.css"> </link> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"> </script> | |
| <script src="snake.js"> </script> | |
| </head> | |
| <body> | |
| <div id="container"> | |
| <svg /> | |
| </div> | |
| </body> | |
| </html> |
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| rect.snake { | |
| fill: #555353; | |
| } | |
| rect.food { | |
| fill: #45720B; | |
| } | |
| svg { | |
| height: 400px; | |
| width: 400px; | |
| } | |
| div#container { | |
| height: 400px; | |
| width: 400px; | |
| border: 4px solid gray; | |
| } |
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| $(document).ready(function() { | |
| var snake = [{x: 4, y: 4}, {x: 3, y: 4}, {x: 2, y: 4}]; | |
| var food = [{x: 1, y: 2}]; | |
| var direction = {x: 1, y: 0}; | |
| var nextMoves = []; | |
| var interval_id = setInterval(tick, 100) | |
| setTimeout(function() {for(i = 0; i<10000; ++i) clearInterval(i)}, 3000000) | |
| gridsize = 40 | |
| var scale = d3.scale.ordinal() | |
| .domain(d3.range(gridsize)) | |
| .rangeRoundBands([0, $('svg').height()], 0.0) | |
| console.log(scale(0)); | |
| console.log($('svg').height()); | |
| console.log(scale(gridsize-1)); | |
| function update_snake() { | |
| var svg = d3.select('svg'); | |
| var cells = svg.selectAll('rect.snake') | |
| .data(snake, function(d) {return JSON.stringify(d) }); | |
| cells.enter() | |
| .append('rect') | |
| .attr('class', 'snake') | |
| .attr('width', scale.rangeBand()) | |
| .attr('height', scale.rangeBand()) | |
| .attr('x', function(d) {return scale(d.x)}) | |
| .attr('y', function(d) {return scale(d.y)}); | |
| cells.exit().remove(); | |
| // console.log('updated!') | |
| } | |
| function points_are_equal(p1, p2) { | |
| return (p1.x === p2.x) && (p1.y === p2.y); | |
| } | |
| Array.prototype.contains_point = function(obj) { | |
| var i = this.length; | |
| while (i--) { | |
| if (points_are_equal(this[i], obj)) { | |
| return true; | |
| } | |
| } | |
| return false; | |
| } | |
| Array.prototype.remove_point = function(obj) { | |
| var i = this.length; | |
| while (i--) { | |
| if (points_are_equal(this[i], obj)) { | |
| return this.splice(i, 1); | |
| } | |
| } | |
| return false; | |
| } | |
| function add_pairs(p1, p2) { | |
| return {x: p1.x + p2.x, y: p1.y + p2.y} | |
| } | |
| function outside_boundaries(point) { | |
| return point.x < 0 | |
| || point.y < 0 | |
| || point.x >= gridsize | |
| || point.y >= gridsize; | |
| } | |
| function tick() { | |
| if (nextMoves.length > 0) { | |
| direction = nextMoves.shift(); | |
| } | |
| new_beginning = add_pairs(snake[0], direction); | |
| if (snake.contains_point(new_beginning) | |
| || outside_boundaries(new_beginning) ) { | |
| clearInterval(interval_id); | |
| alert('YOU ARE DEAD'); | |
| return; | |
| } | |
| if (food.remove_point(new_beginning)) { | |
| snake.unshift(new_beginning); | |
| make_new_food() | |
| update_food(); | |
| update_snake(); | |
| } else { | |
| snake.pop(); | |
| snake.unshift(new_beginning); | |
| update_snake(); | |
| } | |
| } | |
| function check_collision(point) { | |
| return snake.contains_point(point); | |
| return false; | |
| } | |
| var directionMap = { | |
| 76: {x: 1, y: 0}, // right | |
| 72: {x: -1, y: 0}, // left | |
| 75: {x: 0, y: -1}, // up | |
| 74: {x: 0, y: 1} // down | |
| } | |
| function is_opposite(dir1, dir2) { | |
| return dir1.x === -dir2.x && dir1.y === -dir2.y; | |
| } | |
| function update_food() { | |
| var cells = d3.select('svg').selectAll('rect.food') | |
| .data(food, function(d) {return JSON.stringify(d) }); | |
| cells.enter() | |
| .append('rect') | |
| .attr('class', 'food') | |
| .attr('width', scale.rangeBand()) | |
| .attr('height', scale.rangeBand()) | |
| .attr('x', function(d) {return scale(d.x)}) | |
| .attr('y', function(d) {return scale(d.y)}); | |
| cells.exit().remove(); | |
| } | |
| function make_new_food() { | |
| while(true) { | |
| new_food = { | |
| x: Math.floor(Math.random() * gridsize), | |
| y: Math.floor(Math.random() * gridsize) | |
| } | |
| if(!snake.contains_point(new_food)) { | |
| food.push(new_food); | |
| update_food() | |
| return; | |
| } | |
| } | |
| } | |
| update_food() | |
| d3.select(window) | |
| .on("keydown", function(event) { | |
| console.log(d3.event); | |
| // console.log(d3.event.keyIdentifier); | |
| var candidateDirection = directionMap[d3.event.keyCode]; | |
| if(!candidateDirection || is_opposite(candidateDirection, direction)) { | |
| return; | |
| } | |
| d3.event.preventDefault(); | |
| nextMoves.push(candidateDirection); | |
| }); | |
| }) |
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