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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>CNYang Convocation 2015</title>
<style>
body {
margin: 0;
}
noshow {
width: 0px;
height: 0px;
visibility: hidden;
}
</style>
<script src="configuration.js"></script>
<script src="BindingParser.js"></script>
<script>
// ====== Global variables ======
var canvas = null;
var subcanvas = null;
var context = null;
var subcanvascontext = null;
var requestAnimationFrame = null;
var timePrev = -1;
var hp =
{
'realAmount': 100,
'animationAmount': 0
}
var square = new Rectangle(0, 0, 10, 10);
var dimensions = {
'clientWidth': 100,
'clientHeight': 100,
'midX': 50,
'midY': 50
};
var BGM = null;
// definitions for various drawn objects
var outerRectangle = new Rectangle(0, 0, 0, 0);
var innerRectangle = new Rectangle(0, 0, 0, 0);
// bar highlight
var barHighlightOffset = {
'x' : -1000,
'width' : 1000
};
// bar gradients
var greenGrad = new BarGradient(75, 209, 151, 0, 164, 82);
var redGrad = new BarGradient(206, 74, 74, 163, 0, 0);
// backing gradient
var colorGrayGrad = null;
var hpFontSize = 60;
// rotating clock
var clockImg = {
'img': null,
'x': 0,
'y': 0,
'size': [0, 0, 0, 0, 0, 0],
'halfSize': [0, 0, 0, 0, 0, 0],
'alpha': [0, 0, 0, 0, 0, 0],
'alphaPhase': 0,
'tickInvokePhase': 0, // anim phase of the 'change-to-red' animation
'tickInvokePhase2': 0, // anim phase of the back clocks flashes
'phase2data': [2, 1.0], // flashes the clock of elem[0] when tickInvokePhase2 < elem[1]
'fadeIn': true,
'angle': 0,
'speedFactor': 1.0,
'hue': "white"
};
// corner border
var cornerBorder = {
'img': null,
'size': 0,
'alpha': 0.4
};
// health change indicator
var hcGreenGrad = null;
var hcRedGrad = null;
var hcInjured = false;
var hcAlpha = 0;
// sound effect channels
var maxChannels = 10;
var audioChannels = null;
// if this is true, the entire app will stop working
var stopOrder = false;
var animStop = false;
// count down timer
var countDown = {
"timeLeft": -1,
"radius": 128,
"gradient": null,
"maxTime": 60,
"command": null,
"x": 0,
"y": 0,
"startCountDown": function () {
if (this.timeLeft < 0)
playTicking();
this.timeLeft = this.maxTime;
},
"cancelCountDown": function () {
this.timeLeft = -1;
stopTicking();
},
"alarmCallback": null
};
var shockWave = {
"size": 0,
"acc": 0,
"alpha": 0,
"anim": false,
"img": null
};
// ====== Setup ======
// called when the document has finished loading
function setup() {
canvas = document.getElementById("mainCanvas");
context = canvas.getContext("2d");
subcanvas = document.getElementById("subCanvas");
subcanvascontext = subcanvas.getContext("2d");
window.addEventListener("keypress", onKeyDown, true);
if (!context || !subcanvascontext) {
invokeStopOrder("Cannot create canvas context. Stopping...");
return;
}
getDimensions();
resizeObjects();
requestAnimationFrame = window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.msRequestAnimationFrame ||
window.oRequestAnimationFrame ||
function (callback) {
return setTimeout(callback, 1);
};
// create backing gradient
colorGrayGrad = context.createLinearGradient(0, 0, 0, 160);
colorGrayGrad.addColorStop(0, "#010101");
colorGrayGrad.addColorStop(1, "#555555");
// setup clock
clockImg.img = document.getElementById("clockImg");
shockWave.img = document.getElementById("shockImg");
// setup music
BGM = document.getElementById("music2");
if (globalSettings.playMusic)
BGM.play();
// setup audio channels
audioChannels = [];
for (a = 0; a < maxChannels; a++) {
audioChannels[a] = new Object();
audioChannels[a].channel = new Audio();
audioChannels[a].finished = -1;
}
// begin animation
requestAnimationFrame(onFrame);
// setup callbacks
window.onresize = onResize;
// setup binding parser
var i;
for (i = 0; i < globalKeyBindings.length; i++) {
bindKey(globalKeyBindings[i]);
console.log("Parsed: " + globalKeyBindings[i]);
}
bindCommandName("changeHealth", cmdChangeHealth);
bindCommandName("startCountDown", cmdStartCountDown);
bindCommandName("cancelCountDown", cmdCancelCountDown);
// set countdown settings
countDown.maxTime = globalSettings.guessTime;
// corner border
cornerBorder.img = document.getElementById("cornerBorderImg");
}
// ====== Functions ======
// stops the app, with the provided error message
function invokeStopOrder(errMsg) {
stopOrder = true;
document.getElementById("divError").innerHTML = errMsg;
}
// on getting a frame
function onFrame(timeStamp) {
if (!stopOrder) {
if (timePrev < 0) {
// allow first frame call to set up timer
timePrev = timeStamp;
}
else {
// get elapsed time in seconds
var diffTime = (timeStamp - timePrev) / 1000.0;
timePrev = timeStamp;
// update and render
update(diffTime);
render(diffTime);
}
// request for another frame
requestAnimationFrame(onFrame);
}
}
// command bindings
function cmdChangeHealth(arrArgs) {
var chg = parseIntArg("changeHealth", arrArgs[0]);
if (isNaN(chg)) return;
var ind = 0;
if (arrArgs[1] == "GREEN") {
ind = 1;
} else if (arrArgs[1] == "RED") {
ind = -1;
}
changeHealth(chg, ind);
}
function cmdStartCountDown(arrArgs) {
var i = parseIntArg("startCountDown", arrArgs[0]);
if (isNaN(i)) return;
if (i > 0)
countDown.maxTime = i; // override max time
else
countDown.maxTime = globalSettings.guessTime;
var argsCopy = copyArray(arrArgs);
argsCopy.splice(0, 1);
argsCopy.push(null);
argsCopy.push(null);
countDown.command = argsCopy;
countDown.startCountDown();
createShock();
}
function cmdCancelCountDown(arrArgs) {
countDown.cancelCountDown();
}
// main rendering function
function render(elapsedTime) {
var percentage = hp.animationAmount / 100.0;
// clear the screen
context.clearRect(0, 0, dimensions.clientWidth, dimensions.clientHeight);
subcanvascontext.clearRect(0, 0, subcanvas.width, subcanvas.height);
// blacken entire screen
context.fillStyle = "black";
context.fillRect(0, 0, dimensions.clientWidth, dimensions.clientHeight);
// draw the clocks
var iClock;
for (iClock = 0; iClock < 6; iClock++) {
context.save();
context.translate(dimensions.midX, dimensions.midY);
context.rotate((iClock % 2 == 0 ? 1 : -1) * clockImg.angle / (iClock + 1));
context.globalAlpha = clockImg.alpha[iClock];
context.drawImage(clockImg.img, -clockImg.halfSize[iClock], -clockImg.halfSize[iClock],
clockImg.size[iClock], clockImg.size[iClock]);
context.restore();
}
// clock hue
context.save();
context.beginPath();
context.rect(0, 0, dimensions.clientWidth, dimensions.clientHeight);
context.fillStyle = clockImg.hue;
context.globalCompositeOperation = "multiply";
context.fill();
context.restore();
// draw the count down timer
if (countDown.timeLeft > 0) {
context.beginPath();
context.moveTo(countDown.x, countDown.y);
context.arc(countDown.x, countDown.y, countDown.radius,
1.5 * Math.PI, 1.5 * Math.PI + 2 * Math.PI * countDown.timeLeft / countDown.maxTime, false);
context.closePath();
context.globalCompositeOperation = "lighter";
context.fillStyle = countDown.gradient;
context.fill();
context.globalCompositeOperation = "source-over";
}
// draw the shockwave
if (shockWave.anim) {
context.globalCompositeOperation = "overlay";
context.globalAlpha = shockWave.alpha;
context.drawImage(shockWave.img, dimensions.midX - shockWave.size / 2, dimensions.midY - shockWave.size / 2,
shockWave.size, shockWave.size);
context.globalCompositeOperation = "source-over";
context.globalAlpha = 1;
}
// prepare hp bar highlight gradient
var highlightGrad = context.createLinearGradient(barHighlightOffset.x, dimensions.midY - 40,
barHighlightOffset.x + barHighlightOffset.width, dimensions.midY);
highlightGrad.addColorStop(0, "black");
highlightGrad.addColorStop(0.5, "#252525");
highlightGrad.addColorStop(1, "black");
// draw outer rectangle
context.beginPath();
context.rect(outerRectangle.x, outerRectangle.y, outerRectangle.w, outerRectangle.h);
context.strokeStyle = "white";
context.stroke();
// draw the backing
context.save();
context.beginPath();
context.globalCompositeOperation = "lighter";
context.translate(innerRectangle.x, innerRectangle.y);
context.rect(0, 0, outerRectangle.w - 6, innerRectangle.h);
context.fillStyle = colorGrayGrad;
context.fill();
context.globalCompositeOperation = "source-over";
context.restore();
// draw inner rectangle
// -- save transform stack
context.save();
// -- set the colors
var colorLight = lerpColor(redGrad.lightr, redGrad.lightg, redGrad.lightb,
greenGrad.lightr, greenGrad.lightg, greenGrad.lightb, percentage);
var colorDark = lerpColor(redGrad.darkr, redGrad.darkg, redGrad.darkb,
greenGrad.darkr, greenGrad.darkg, greenGrad.darkb, percentage);
var barColorGrad = context.createLinearGradient(0, 0, 0, 158);
barColorGrad.addColorStop(0, colorLight);
barColorGrad.addColorStop(1, colorDark);
// -- draw the rectangle
context.translate(innerRectangle.x, innerRectangle.y);
context.beginPath();
context.globalAlpha = 0.75;
context.rect(0, 0, innerRectangle.w, innerRectangle.h);
context.fillStyle = barColorGrad;
context.fill();
context.globalAlpha = 1;
// -- pop transform stack
context.restore();
// draw the hp bar highlight
// -- additive blend the highlight
context.globalCompositeOperation = "lighter";
context.beginPath();
context.fillStyle = highlightGrad;
context.rect(innerRectangle.x, innerRectangle.y, innerRectangle.w, innerRectangle.h);
context.fill();
context.globalCompositeOperation = "source-over";
context.restore();
// draw hp text
context.font = Math.floor(hpFontSize).toString() + "px Arial";
context.fillStyle = "white";
context.textBaseline = "hanging";
var txt = Math.floor(hp.animationAmount).toString() + "%";
var txtMeasure = context.measureText(txt).width / 2.0;
context.fillText(txt, dimensions.midX - txtMeasure, outerRectangle.y + outerRectangle.h + 10);
// draw copyright
context.font = "13px Arial";
txt = "Copyright © 2015 CNYSP";
context.textBaseline = "bottom";
txtMeasure = context.measureText(txt);
context.fillText(txt, dimensions.clientWidth - cornerBorder.size - 10 - txtMeasure.width, dimensions.clientHeight - 3);
// draw health indicator foreground
if (hcAlpha > 0) {
context.beginPath();
context.fillStyle = (hcInjured ? hcRedGrad : hcGreenGrad);
context.globalAlpha = hcAlpha;
context.globalCompositeOperation = "lighter";
context.rect(0, 0, dimensions.clientWidth, dimensions.clientHeight);
context.fill();
context.globalAlpha = 1;
context.globalCompositeOperation = "source-over";
}
// draw corner borders
context.save();
context.globalAlpha = cornerBorder.alpha;
context.drawImage(cornerBorder.img, 0, 0, cornerBorder.size, cornerBorder.size); // TL
context.translate(dimensions.clientWidth, 0);
context.rotate(Math.PI / 2);
context.drawImage(cornerBorder.img, 0, 0, cornerBorder.size, cornerBorder.size); // TR
context.restore();
context.save();
context.globalAlpha = cornerBorder.alpha;
context.translate(dimensions.clientWidth, dimensions.clientHeight);
context.rotate(Math.PI);
context.drawImage(cornerBorder.img, 0, 0, cornerBorder.size, cornerBorder.size); // BR
context.restore();
context.save();
context.globalAlpha = cornerBorder.alpha;
context.translate(0, dimensions.clientHeight);
context.rotate(-Math.PI / 2);
context.drawImage(cornerBorder.img, 0, 0, cornerBorder.size, cornerBorder.size); // BL
context.transform(1, 0, 0, 1, 0, 0);
context.globalAlpha = 1.0;
context.restore();
}
// updating function
function update(elapsedTime) {
// update the hp bar dimensions
innerRectangle.w = hp.animationAmount * (outerRectangle.w - 6) / 100.0;
if (!animStop) {
// update clock rotation and fader
if (clockImg.speedFactor < 1.0) { // animation during ticking
clockImg.angle -= elapsedTime * Math.PI / 50 * clockImg.speedFactor;
// this animates starting of the countdown
clockImg.alpha[0] = lerpFloat(0.7, 0.1, clockImg.tickInvokePhase);
clockImg.alpha[1] = lerpFloat(0.2, 1, clockImg.tickInvokePhase);
if (clockImg.tickInvokePhase > 0) {
clockImg.tickInvokePhase -= elapsedTime;
if (clockImg.tickInvokePhase < 0) clockImg.tickInvokePhase = 0;
}
}
else { // idle animation
clockImg.angle += elapsedTime * Math.PI / 50 * clockImg.speedFactor;
clockImg.alphaPhase += Math.PI / 15 * elapsedTime;
if (clockImg.alphaPhase > 2 * Math.PI) clockImg.alphaPhase -= 2 * Math.PI;
clockImg.alpha[0] = 0.2 * Math.cos(clockImg.alphaPhase) + 0.4;
clockImg.alpha[1] = 0.2 * Math.cos(clockImg.alphaPhase - Math.PI / 2) + 0.4;
}
// back clocks flashing animation
if (clockImg.tickInvokePhase2 > 0) {
clockImg.tickInvokePhase2 -= elapsedTime;
if (clockImg.phase2data[1] > clockImg.tickInvokePhase2 && clockImg.phase2data[0] < 6) {
// flash the next clock
clockImg.alpha[clockImg.phase2data[0]] = 0.5;
// advance to next clock
clockImg.phase2data[0]++;
clockImg.phase2data[1] -= 0.1;
}
}
var iClock;
for (iClock = 2; iClock < 6; iClock++) {
if (clockImg.alpha[iClock] > 0) {
clockImg.alpha[iClock] -= 0.5 * elapsedTime;
if (clockImg.alpha[iClock] < 0) clockImg.alpha[iClock] = 0;
}
}
// update countdown
if (countDown.timeLeft > 0) {
countDown.timeLeft -= elapsedTime;
if (countDown.timeLeft <= 0) {
stopTicking();
countDown.timeLeft = -1;
if (countDown.command[0] != null) {
// parse and execute command
var leftover = countDown.command.splice(0, 1);
passArguments(leftover[0], countDown.command);
if (leftover[0] != "STARTCOUNTDOWN") {
countDown.command = null; // remove command
createShock();
}
}
else {
changeHealth(3, -1);
createShock();
}
}
}
}
// update health change indicator
if (hcAlpha > 0) {
hcAlpha -= 0.5 * elapsedTime;
if (hcAlpha < 0) hcAlpha = 0;
}
// animate hp bar scaling by moving animAmount to realAmount
var diff;
if (hp.realAmount > hp.animationAmount) {
diff = Math.max(20, hp.realAmount - hp.animationAmount)
hp.animationAmount += diff * elapsedTime;
if (hp.animationAmount > hp.realAmount) hp.animationAmount = hp.realAmount;
}
else if (hp.realAmount < hp.animationAmount) {
diff = Math.max(20, hp.animationAmount - hp.realAmount);
hp.animationAmount -= diff * elapsedTime;
if (hp.animationAmount < hp.realAmount) hp.animationAmount = hp.realAmount;
}
// update hp bar highlight
barHighlightOffset.x += 1024 * elapsedTime;
if (barHighlightOffset.x > innerRectangle.w + barHighlightOffset.width + 100) {
barHighlightOffset.x = -(barHighlightOffset.width + 100);
}
// update shockwave
if (shockWave.anim) {
shockWave.size += shockWave.acc * elapsedTime;
shockWave.acc /= Math.pow(12, elapsedTime);
if (shockWave.size > clockImg.size / 2) {
shockWave.alpha -= elapsedTime;
if (shockWave.alpha <= 0) {
shockWave.alpha = 0;
shockWave.anim = false;
}
}
}
}
// on resize
function onResize() {
getDimensions();
resizeObjects();
}
// obtain client dimensions
function getDimensions() {
dimensions.clientWidth = window.innerWidth;
dimensions.clientHeight = window.innerHeight;
dimensions.midX = dimensions.clientWidth / 2.0;
dimensions.midY = dimensions.clientHeight / 2.0;
canvas.width = dimensions.clientWidth;
canvas.height = dimensions.clientHeight;
}
// resize the various drawn objects
function resizeObjects() {
outerRectangle.x = 10;
outerRectangle.y = dimensions.midY - 80;
outerRectangle.w = dimensions.clientWidth - 20;
outerRectangle.h = 160;
innerRectangle.x = outerRectangle.x + 3;
innerRectangle.y = outerRectangle.y + 3;
innerRectangle.w = outerRectangle.w - 6;
innerRectangle.h = outerRectangle.h - 6;
// resize clocks
var minSize = Math.min(dimensions.clientWidth, dimensions.clientHeight);
minSize = Math.max(256, minSize - 256);
var iClock;
clockImg.size[0] = minSize;
clockImg.halfSize[0] = minSize / 2;
for (iClock = 1; iClock < 6; iClock += 1) {
clockImg.size[iClock] = 1.35 * clockImg.size[iClock - 1];
clockImg.halfSize[iClock] = clockImg.size[iClock] / 2;
}
clockImg.x = dimensions.midX;
clockImg.y = dimensions.midY;
// resize indicator gradients
hcGreenGrad = context.createRadialGradient(dimensions.midX, dimensions.midY, 100, dimensions.midX, dimensions.midY, dimensions.midX);
hcRedGrad = context.createRadialGradient(dimensions.midX, dimensions.midY, 100, dimensions.midX, dimensions.midY, dimensions.midX);
hcGreenGrad.addColorStop(0, "black");
hcGreenGrad.addColorStop(1, "#00F000");
hcRedGrad.addColorStop(0, "black");
hcRedGrad.addColorStop(1, "#F00000");
// resize count down
countDown.radius = minSize / 2.25;
countDown.x = dimensions.midX;
countDown.y = dimensions.midY;
countDown.gradient = context.createRadialGradient(countDown.x, countDown.y, 0, countDown.x, countDown.y, countDown.radius);
countDown.gradient.addColorStop(0, "#000000");
countDown.gradient.addColorStop(0.85, "#FF9900");
countDown.gradient.addColorStop(1, "#000000");
countDown.maxTime = globalSettings.guessTime;
// resize corner border
var scaleFactor = minSize / 800;
cornerBorder.size = 256 * scaleFactor;
}
// create a new rectangle object
function Rectangle(px, py, sw, sh) {
this.x = px;
this.y = py;
this.w = sw;
this.h = sh;
}
// change to hex
function componentToHex(c) {
var hex = c.toString(16);
return (hex.length == 1 ? "0" + hex : hex);
}
// change rgb to hex
function rgbToHex(r, g, b) {
return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b);
}
// interpolate between two colors and return hex code
function lerpColor(r0, g0, b0, r1, g1, b1, t) {
// clamp
if (t < 0) t = 0;
if (t > 1) t = 1;
var fac = 1.0 - t;
var r = Math.floor(t * r1 + fac * r0);
var g = Math.floor(t * g1 + fac * g0);
var b = Math.floor(t * b1 + fac * b0);
return rgbToHex(r, g, b);
}
function lerpFloat(f0, f1, t) {
if (t < 0) t = 0;
if (t > 1) t = 1;
var fac = 1.0 - t;
return t * f1 + fac * f0;
}
// defines the colours for the main health bar gradient
function BarGradient(r0, g0, b0, r1, g1, b1) {
this.lightr = r0;
this.lightg = g0;
this.lightb = b0;
this.darkr = r1;
this.darkg = g1;
this.darkb = b1;
}
function changeHealth(change, ind) {
hp.realAmount += change;
if (hp.realAmount < 0) {
hp.realAmount = 0;
animStop = true;
BGM.pause();
}
else {
animStop = false;
if (BGM.paused) BGM.play();
}
if (hp.realAmount > 100) hp.realAmount = 100;
hcInjured = (ind < 0);
if (ind != 0) {
hcAlpha = 0.8;
playSound(hcInjured ? "sndWrong" : "sndCorrect");
}
}
// key press handler
function onKeyDown(evt) {
var c = evt.keyCode;
var i;
for (i = 0; i < parsedKeyBinding.length; i++) {
if (parsedKeyBinding[i].keyCode == c || parsedKeyBinding[i].keyCode + 32 == c) {
console.log("Key : " +
String.fromCharCode(parsedKeyBinding[i].keyCode) +
"; Command: " + parsedKeyBinding[i].command);
passArguments(parsedKeyBinding[i].command, parsedKeyBinding[i].arguments);
return;
}
}
}
// play sound effect on multi channel
function playSound(sound) {
if (globalSettings.playSFX) {
var thistime;
var a;
for (a = 0; a < maxChannels; a++) {
thistime = new Date();
if (audioChannels[a].finished < thistime.getTime()) {
// this one is available
audioChannels[a].finished = thistime.getTime() +
document.getElementById(sound).duration * 1000;
audioChannels[a].channel.src = document.getElementById(sound).src;
audioChannels[a].channel.load();
audioChannels[a].channel.play();
break;
}
}
}
}
// create the shockwave
function createShock() {
shockWave.size = 0;
shockWave.alpha = 1;
shockWave.anim = true;
shockWave.acc = clockImg.size[2] * 4;
}
// creates a new copy of array
function copyArray(arrOrig) {
var arr2 = [];
var i;
for (i = 0; i < arrOrig.length; i++) {
arr2[i] = arrOrig[i];
}
return arr2;
}
function playTicking() {
var snd = document.getElementById("sndTickingStart");
snd.play();
clockImg.speedFactor = 0.25;
clockImg.hue = "red";
clockImg.tickInvokePhase = 1.0;
clockImg.tickInvokePhase2 = 1.0;
clockImg.phase2data = [2, 1.0];
BGM.volume = 0.2;
}
function stopTicking() {
var snd = document.getElementById("sndTickingStart");
snd.pause();
snd.load();
clockImg.speedFactor = 1.0;
clockImg.hue = "white";
BGM.volume = 1.0;
}
</script>
</head>
<body onload="setup()" style="overflow:hidden">
<div id="divError" style="color: red"></div>
<div id="container">
<canvas id="mainCanvas" width="500" height="500">
Canvas not supported. Oh dear...
</canvas>
</div>
<img id="clockImg" src="clock.png" class="noshow" alt="clock"/>
<img id="shockImg" src="shockwave.png" class="noshow" alt="shockwave"/>
<img id="cornerBorderImg" src="border_corner.png" class="noshow" alt="border"/>
<!-- Audio sources -->
<audio id="music2" preload="auto" class="noshow" loop="loop">
<source src="Sounds/music2.mp3" type="audio/mpeg" />
</audio>
<audio src="Sounds/correct.ogg" id="sndCorrect" preload="auto" class="noshow">
</audio>
<audio src="Sounds/wrong.ogg" id="sndWrong" preload="auto" class="noshow">
</audio>
<audio src="Sounds/tickingstart.ogg" id="sndTickingStart" preload="auto" class="noshow">
</audio>
<!-- Sub canvas for extra drawing -->
<canvas id="subCanvas" style="visibility:hidden" width="500" height="500"></canvas>
</body>
</html>
<!-- Created by Ong Bee Lee-->