April Breeze

window.addEventListener("keydown", moveSnake, false); var game_over = false; var snake = new Array(4); var snakeLen = 4; var dir = "right"; var food = ""; var level = new Array(); var total_height = 640; var total_width = 640; var lvl_width = 20; var lvl_height = 20; var speed = 16; snakeHeadImage = new Image(); snakeHeadImage.src = "resources/head.png"; snakeBodyImage = new Image(); snakeBodyImage.src = "resources/body.png"; snakeTailImage = new Image(); snakeTailImage.src = "resources/tail.png"; //food foodImage = new Image(); foodImage.src = "resources/food.png"; create_snake(); create_food(); for(i = 0; i < lvl_width; i++) { level[i] = new Array(lvl_height); for(var ii = 0; ii < lvl_height; ii++) { level[i][ii] = -1; } } window.requestAnimFrame = (function(callback) { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(callback) { window.setTimeout(callback, 1000); }; })(); var the_date = new Date(); var test1 = the_date.getTime(); var stamp = the_date.getTime() + 250; function animate() { the_date = new Date(); test1 = the_date.getTime(); if(stamp <= test1) { move_snake(); the_date = new Date(); stamp = the_date.getTime() + 250; } if(game_over == false) { // clear context.clearRect(0, 0, canvas.width, canvas.height); displayText("Score: " + (snakeLen - 4)); display(); } else { displayText("You so Sux.. Game Over homie"); } //context.drawImage(aniblock, aniblock_x, aniblock_y); // request new frame requestAnimFrame(function() { animate(); }); } function displayText(what) { context.font = "30px Arial"; context.fillText(what, 50, 50); } function checkSnakeCollide() { if( snake[0].xx == food.xx && snake[0].yy == food.yy ) { create_food(); return true; } else { //if head moving right if(dir == "right") { if(snake[0].xx > lvl_width - 1) { game_over = true; } } else if(dir == "left") { if(snake[0].xx < 0) { game_over = true; } } else if(dir == "up") { if(snake[0].yy <= -1) { game_over = true; } } else if(dir = "down") { if(snake[0].yy >= lvl_height) { game_over = true; } } for(i = 2; i < snakeLen; i++) { if( (snake[0].xx == snake[i].xx) && (snake[0].yy == snake[i].yy) ) { game_over = true; break; } } return false; } } setTimeout(function() { animate(); }, 1000); function moveSnake(e) { switch(e.keyCode) { case 37: if(dir != "right") { dir = "left"; } break; case 38: if(dir != "down") { dir = "up"; } break; case 39: if(dir != "left") { dir = "right"; } break; case 40: if(dir != "up") { dir = "down"; } break; } } function checkAllowMove(x, y) { if(x < 32) { var x_index = 0; } else { var x_index = Math.round(x / 32); } if(y < 32) { var y_index = 19; } else { var y_index = (total_height / 32) - Math.round(y / 32); } if(level[x_index][y_index] == -1) { return true; } else { return false; } } function create_food() { var x = 0; var y = 0; var recreate = false; do { recreate = false; x = Math.floor((Math.random() * (lvl_width-1))); y = Math.floor((Math.random() * (lvl_height-1))); for(i = 0; i < snakeLen; i++) { if( (snake[i].xx == x) && (snake[i].yy == y) ) { recreate = true; break; } } }while(recreate == true); food = {xx: x, yy: y}; } function create_snake() { //var x = Math.floor((Math.random() * (lvl_width-1))); //var y = Math.floor((Math.random() * (lvl_height-1))); snake[0] = {xx: 4, yy: 1}; snake[1] = {xx: 3, yy: 1}; snake[2] = {xx: 2, yy: 1}; snake[3] = {xx: 1, yy: 1}; dir = "right"; } function move_snake() { var temp_x = 0; var temp_y = 0; var temp_xx = 0; var temp_yy = 0; var swap = true; //move snake forward for(var ii = 0; ii < snakeLen; ii++) { if(ii == 0) { temp_x = snake[ii].xx; temp_y = snake[ii].yy; //if head moving right if(dir == "right") { snake[0] = {xx: (snake[0].xx + 1), yy: snake[0].yy}; } else if(dir == "left") { snake[0] = {xx: (snake[0].xx - 1), yy: snake[0].yy}; } else if(dir == "up") { snake[0] = {xx: snake[0].xx, yy: (snake[0].yy - 1)}; } else if(dir = "down") { snake[0] = {xx: snake[0].xx, yy: (snake[0].yy + 1)}; } if(checkSnakeCollide()) { snake.push({xx: snake[(snake.length-1)].xx, yy: snake[(snake.length-1)].yy}); snakeLen++; } } else { if(swap == true) { temp_xx = snake[ii].xx; temp_yy = snake[ii].yy; snake[ii] = {xx: temp_x, yy: temp_y}; swap = false; } else { temp_x = snake[ii].xx; temp_y = snake[ii].yy; snake[ii] = {xx: temp_xx, yy: temp_yy}; swap = true; } } } } function display() { for(var i = 0; i < snakeLen; i++) { if(i == 0) { switch (dir) { case "left": context.drawImage(snakeHeadImage, (snake[i].xx * 32), (snake[i].yy * 32) ); break; case "right": drawRotatedImage(snakeHeadImage,(snake[i].xx * 32), (snake[i].yy * 32), 180); break; case "up": drawRotatedImage(snakeHeadImage,(snake[i].xx * 32), (snake[i].yy * 32), 90); break; case "down": drawRotatedImage(snakeHeadImage,(snake[i].xx * 32), (snake[i].yy * 32), 270); break; } } else if(i == (snakeLen - 1) ) { //following left if(snake[i].xx > snake[i-1].xx) { context.drawImage(snakeTailImage, (snake[i].xx * 32), (snake[i].yy * 32) ); } //following right else if(snake[i].xx < snake[i-1].xx) { drawRotatedImage(snakeTailImage,(snake[i].xx * 32), (snake[i].yy * 32), 180); } //following up else if(snake[i].yy > snake[i-1].yy) { drawRotatedImage(snakeTailImage,(snake[i].xx * 32), (snake[i].yy * 32), 90); } //following down else if(snake[i].yy < snake[i-1].yy) { drawRotatedImage(snakeTailImage,(snake[i].xx * 32), (snake[i].yy * 32), 270); } } else { context.drawImage(snakeBodyImage, (snake[i].xx * 32), (snake[i].yy * 32) ); } } context.drawImage(foodImage, (food.xx * 32), (food.yy * 32) ); } function drawRotatedImage(image, x, y, angle) { var TO_RADIANS = Math.PI/180; // save the current co-ordinate system // before we screw with it context.save(); // move to the middle of where we want to draw our image context.translate(x, y); // rotate around that point, converting our // angle from degrees to radians context.rotate(angle * TO_RADIANS); // draw it up and to the left by half the width // and height of the image context.drawImage(image, -(image.width/2), -(image.height/2)); // and restore the co-ords to how they were when we began context.restore(); }