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game.js
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game.js
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/*
Created by:
Victor Williams
*/
var player;
var blocks = [];
var gl;
var display,scoreDisplay,statusDisplay,playDisplay;
var score = 0, scoreThreshold = 500;
var SetTime = 60;
var gameStarted = false;
var lastFrame = performance.now();
function initializeGame() {
display = document.getElementById("time");
scoreDisplay = document.getElementById("score");
statusDisplay = document.getElementById("status");
playDisplay = document.getElementById("play");
var canvas=document.getElementById("gl-canvas");
gl=WebGLUtils.setupWebGL(canvas);
if (!gl) { alert( "WebGL is not available" ); }
gl.viewport(0, 0, 512, 512); // set size of viewport
gl.clearColor(0.0, 0.0, 0.0, 1.0); // background black
gl.clear(gl.COLOR_BUFFER_BIT); // allows color
var timestep = lastFrame;
player = new Player(gl); // create new player
player.render(false, false, 0);
render(timestep);
}
var keyEnum = { UP:0, DOWN:1, LEFT:2, RIGHT:3 };
var keyArray = new Array(4);
function keyDown(event) {
var keyCode = event.keyCode;
if (keyCode == 32) { // SPACE
event.preventDefault();
}
else if (keyCode == 37) { // LEFT
event.preventDefault();
keyArray[keyEnum.LEFT] = true;
}
else if (keyCode == 38) { // UP
event.preventDefault();
keyArray[keyEnum.UP] = true;
}
else if (keyCode == 39) { // RIGHT
event.preventDefault();
keyArray[keyEnum.RIGHT] = true;
}
else if (keyCode == 40) { // DOWN
event.preventDefault();
keyArray[keyEnum.DOWN] = true;
}
}
function keyUp(event) {
var keyCode = event.keyCode;
if (keyCode == 32) { // SPACE
event.preventDefault();
startGame();
}
else if (keyCode == 37) { // LEFT
event.preventDefault();
keyArray[keyEnum.LEFT] = false;
}
else if (keyCode == 38) { // UP
event.preventDefault();
keyArray[keyEnum.UP] = false;
}
else if (keyCode == 39) { // RIGHT
event.preventDefault();
keyArray[keyEnum.RIGHT] = false;
}
else if (keyCode == 40) { // DOWN
event.preventDefault();
keyArray[keyEnum.DOWN] = false;
}
}
function render(frameStart) {
var timestep = frameStart - lastFrame;
lastFrame = frameStart;
gl.clear(gl.COLOR_BUFFER_BIT); // allows color
player.render(keyArray[keyEnum.LEFT], keyArray[keyEnum.RIGHT], timestep);
for (var i=0;i<blocks.length;i++) {
blocks[i].render(timestep);
if (blocks[i].points[blocks[i].rightBottomMax][1] <= player.points[player.leftTopMax][1] && blocks[i].points[blocks[i].leftTopMax][1] >= player.points[player.rightBottomMax][1] &&
blocks[i].points[blocks[i].rightBottomMax][0] >= player.points[player.leftTopMax][0] && blocks[i].points[blocks[i].leftTopMax][0] <= player.points[player.rightBottomMax][0]) {
score += blocks[i].blockData.points;
scoreDisplay.textContent = score;
blocks.splice(i,1);
i--;
}
else if (blocks[i].points[blocks[i].leftTopMax][1] <= -1.0) {
blocks.splice(i,1);
i--;
}
}
window.requestAnimFrame(render);
}
var gameTimer;
function startTimer(duration, display) {
var timer = duration, minutes, seconds;
gameTimer = setInterval(function () {
minutes = parseInt(timer / 60, 10);
seconds = parseInt(timer % 60, 10);
minutes = minutes < 10 ? "0" + minutes : minutes;
seconds = seconds < 10 ? "0" + seconds : seconds;
display.textContent = minutes + ":" + seconds;
SpawnBlocks(timer);
if (--timer < 0) {
timer = 0;
}
}, 1000);
}
function startGame() {
if (gameStarted == false) {
gameStarted = true;
score = 0;
scoreDisplay.textContent = score;
statusDisplay.textContent = "Playing...";
statusDisplay.style.color = "gray";
playDisplay.textContent = "";
startTimer(SetTime, display);
}
}
function SpawnBlocks(timer) {
if (timer != 0) {
blocks.push(new Block(gl));
}
else {
blocks.splice(0,blocks.length);
clearInterval(gameTimer);
display.textContent = "01:00";
gameStarted = false;
if (score >= scoreThreshold) {
statusDisplay.textContent = "YOU WON!";
statusDisplay.style.color = "green";
}
else {
statusDisplay.textContent = "YOU LOST!";
statusDisplay.style.color = "red";
}
playDisplay.textContent = "Press SPACE to play again!";
}
}