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v4.final.html
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v4.final.html
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<!DOCTYPE html>
<html>
<head>
<title>Javascript Racer - v4 (final)</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<link href="common.css" rel="stylesheet" type="text/css" />
</head>
<body>
<table id="controls">
<tr>
<td colspan="2">
<a href='v1.straight.html'>straight</a> |
<a href='v2.curves.html'>curves</a> |
<a href='v3.hills.html'>hills</a> |
<a href='v4.final.html'>final</a>
</td>
</tr>
<tr><td id="fps" colspan="2" align="right"></td></tr>
<tr>
<th><label for="resolution">Resolution :</label></th>
<td>
<select id="resolution" style="width:100%">
<option value='fine'>Fine (1280x960)</option>
<option selected value='high'>High (1024x768)</option>
<option value='medium'>Medium (640x480)</option>
<option value='low'>Low (480x360)</option>
</select>
</td>
</tr>
<tr>
<th><label for="lanes">Lanes :</label></th>
<td>
<select id="lanes">
<option>1</option>
<option>2</option>
<option selected>3</option>
<option>4</option>
</select>
</td>
</tr>
<tr>
<th><label for="roadWidth">Road Width (<span id="currentRoadWidth"></span>) :</label></th>
<td><input id="roadWidth" type='range' min='500' max='3000' title="integer (500-3000)"></td>
</tr>
<tr>
<th><label for="cameraHeight">CameraHeight (<span id="currentCameraHeight"></span>) :</label></th>
<td><input id="cameraHeight" type='range' min='500' max='5000' title="integer (500-5000)"></td>
</tr>
<tr>
<th><label for="drawDistance">Draw Distance (<span id="currentDrawDistance"></span>) :</label></th>
<td><input id="drawDistance" type='range' min='100' max='500' title="integer (100-500)"></td>
</tr>
<tr>
<th><label for="fieldOfView">Field of View (<span id="currentFieldOfView"></span>) :</label></th>
<td><input id="fieldOfView" type='range' min='80' max='140' title="integer (80-140)"></td>
</tr>
<tr>
<th><label for="fogDensity">Fog Density (<span id="currentFogDensity"></span>) :</label></th>
<td><input id="fogDensity" type='range' min='0' max='50' title="integer (0-50)"></td>
</tr>
</table>
<div id='instructions'>
<p>Use the <b>arrow keys</b> to drive the car.</p>
</div>
<div id="racer">
<div id="hud">
<span id="speed" class="hud"><span id="speed_value" class="value">0</span> mph</span>
<span id="current_lap_time" class="hud">Time: <span id="current_lap_time_value" class="value">0.0</span></span>
<span id="last_lap_time" class="hud">Last Lap: <span id="last_lap_time_value" class="value">0.0</span></span>
<span id="fast_lap_time" class="hud">Fastest Lap: <span id="fast_lap_time_value" class="value">0.0</span></span>
</div>
<canvas id="canvas">
Sorry, this example cannot be run because your browser does not support the <canvas> element
</canvas>
Loading...
</div>
<audio id='music'>
<source src="music/racer.ogg">
<source src="music/racer.mp3">
</audio>
<span id="mute"></span>
<script src="stats.js"></script>
<script src="common.js"></script>
<script>
var fps = 60; // how many 'update' frames per second
var step = 1/fps; // how long is each frame (in seconds)
var width = 1024; // logical canvas width
var height = 768; // logical canvas height
var centrifugal = 0.3; // centrifugal force multiplier when going around curves
var offRoadDecel = 0.99; // speed multiplier when off road (e.g. you lose 2% speed each update frame)
var skySpeed = 0.001; // background sky layer scroll speed when going around curve (or up hill)
var hillSpeed = 0.002; // background hill layer scroll speed when going around curve (or up hill)
var treeSpeed = 0.003; // background tree layer scroll speed when going around curve (or up hill)
var skyOffset = 0; // current sky scroll offset
var hillOffset = 0; // current hill scroll offset
var treeOffset = 0; // current tree scroll offset
var segments = []; // array of road segments
var cars = []; // array of cars on the road
var stats = Game.stats('fps'); // mr.doobs FPS counter
var canvas = Dom.get('canvas'); // our canvas...
var ctx = canvas.getContext('2d'); // ...and its drawing context
var background = null; // our background image (loaded below)
var sprites = null; // our spritesheet (loaded below)
var resolution = null; // scaling factor to provide resolution independence (computed)
var roadWidth = 2000; // actually half the roads width, easier math if the road spans from -roadWidth to +roadWidth
var segmentLength = 200; // length of a single segment
var rumbleLength = 3; // number of segments per red/white rumble strip
var trackLength = null; // z length of entire track (computed)
var lanes = 3; // number of lanes
var fieldOfView = 100; // angle (degrees) for field of view
var cameraHeight = 1000; // z height of camera
var cameraDepth = null; // z distance camera is from screen (computed)
var drawDistance = 300; // number of segments to draw
var playerX = 0; // player x offset from center of road (-1 to 1 to stay independent of roadWidth)
var playerZ = null; // player relative z distance from camera (computed)
var fogDensity = 5; // exponential fog density
var position = 0; // current camera Z position (add playerZ to get player's absolute Z position)
var speed = 0; // current speed
var maxSpeed = segmentLength/step; // top speed (ensure we can't move more than 1 segment in a single frame to make collision detection easier)
var accel = maxSpeed/5; // acceleration rate - tuned until it 'felt' right
var breaking = -maxSpeed; // deceleration rate when braking
var decel = -maxSpeed/5; // 'natural' deceleration rate when neither accelerating, nor braking
var offRoadDecel = -maxSpeed/2; // off road deceleration is somewhere in between
var offRoadLimit = maxSpeed/4; // limit when off road deceleration no longer applies (e.g. you can always go at least this speed even when off road)
var totalCars = 200; // total number of cars on the road
var currentLapTime = 0; // current lap time
var lastLapTime = null; // last lap time
var keyLeft = false;
var keyRight = false;
var keyFaster = false;
var keySlower = false;
var hud = {
speed: { value: null, dom: Dom.get('speed_value') },
current_lap_time: { value: null, dom: Dom.get('current_lap_time_value') },
last_lap_time: { value: null, dom: Dom.get('last_lap_time_value') },
fast_lap_time: { value: null, dom: Dom.get('fast_lap_time_value') }
}
//=========================================================================
// UPDATE THE GAME WORLD
//=========================================================================
function update(dt) {
var n, car, carW, sprite, spriteW;
var playerSegment = findSegment(position+playerZ);
var playerW = SPRITES.PLAYER_STRAIGHT.w * SPRITES.SCALE;
var speedPercent = speed/maxSpeed;
var dx = dt * 2 * speedPercent; // at top speed, should be able to cross from left to right (-1 to 1) in 1 second
var startPosition = position;
updateCars(dt, playerSegment, playerW);
position = Util.increase(position, dt * speed, trackLength);
if (keyLeft)
playerX = playerX - dx;
else if (keyRight)
playerX = playerX + dx;
playerX = playerX - (dx * speedPercent * playerSegment.curve * centrifugal);
if (keyFaster)
speed = Util.accelerate(speed, accel, dt);
else if (keySlower)
speed = Util.accelerate(speed, breaking, dt);
else
speed = Util.accelerate(speed, decel, dt);
if ((playerX < -1) || (playerX > 1)) {
if (speed > offRoadLimit)
speed = Util.accelerate(speed, offRoadDecel, dt);
for(n = 0 ; n < playerSegment.sprites.length ; n++) {
sprite = playerSegment.sprites[n];
spriteW = sprite.source.w * SPRITES.SCALE;
if (Util.overlap(playerX, playerW, sprite.offset + spriteW/2 * (sprite.offset > 0 ? 1 : -1), spriteW)) {
speed = maxSpeed/5;
position = Util.increase(playerSegment.p1.world.z, -playerZ, trackLength); // stop in front of sprite (at front of segment)
break;
}
}
}
for(n = 0 ; n < playerSegment.cars.length ; n++) {
car = playerSegment.cars[n];
carW = car.sprite.w * SPRITES.SCALE;
if (speed > car.speed) {
if (Util.overlap(playerX, playerW, car.offset, carW, 0.8)) {
speed = car.speed * (car.speed/speed);
position = Util.increase(car.z, -playerZ, trackLength);
break;
}
}
}
playerX = Util.limit(playerX, -3, 3); // dont ever let it go too far out of bounds
speed = Util.limit(speed, 0, maxSpeed); // or exceed maxSpeed
skyOffset = Util.increase(skyOffset, skySpeed * playerSegment.curve * (position-startPosition)/segmentLength, 1);
hillOffset = Util.increase(hillOffset, hillSpeed * playerSegment.curve * (position-startPosition)/segmentLength, 1);
treeOffset = Util.increase(treeOffset, treeSpeed * playerSegment.curve * (position-startPosition)/segmentLength, 1);
if (position > playerZ) {
if (currentLapTime && (startPosition < playerZ)) {
lastLapTime = currentLapTime;
currentLapTime = 0;
if (lastLapTime <= Util.toFloat(Dom.storage.fast_lap_time)) {
Dom.storage.fast_lap_time = lastLapTime;
updateHud('fast_lap_time', formatTime(lastLapTime));
Dom.addClassName('fast_lap_time', 'fastest');
Dom.addClassName('last_lap_time', 'fastest');
}
else {
Dom.removeClassName('fast_lap_time', 'fastest');
Dom.removeClassName('last_lap_time', 'fastest');
}
updateHud('last_lap_time', formatTime(lastLapTime));
Dom.show('last_lap_time');
}
else {
currentLapTime += dt;
}
}
updateHud('speed', 5 * Math.round(speed/500));
updateHud('current_lap_time', formatTime(currentLapTime));
}
//-------------------------------------------------------------------------
function updateCars(dt, playerSegment, playerW) {
var n, car, oldSegment, newSegment;
for(n = 0 ; n < cars.length ; n++) {
car = cars[n];
oldSegment = findSegment(car.z);
car.offset = car.offset + updateCarOffset(car, oldSegment, playerSegment, playerW);
car.z = Util.increase(car.z, dt * car.speed, trackLength);
car.percent = Util.percentRemaining(car.z, segmentLength); // useful for interpolation during rendering phase
newSegment = findSegment(car.z);
if (oldSegment != newSegment) {
index = oldSegment.cars.indexOf(car);
oldSegment.cars.splice(index, 1);
newSegment.cars.push(car);
}
}
}
function updateCarOffset(car, carSegment, playerSegment, playerW) {
var i, j, dir, segment, otherCar, otherCarW, lookahead = 20, carW = car.sprite.w * SPRITES.SCALE;
// optimization, dont bother steering around other cars when 'out of sight' of the player
if ((carSegment.index - playerSegment.index) > drawDistance)
return 0;
for(i = 1 ; i < lookahead ; i++) {
segment = segments[(carSegment.index+i)%segments.length];
if ((segment === playerSegment) && (car.speed > speed) && (Util.overlap(playerX, playerW, car.offset, carW, 1.2))) {
if (playerX > 0.5)
dir = -1;
else if (playerX < -0.5)
dir = 1;
else
dir = (car.offset > playerX) ? 1 : -1;
return dir * 1/i * (car.speed-speed)/maxSpeed; // the closer the cars (smaller i) and the greated the speed ratio, the larger the offset
}
for(j = 0 ; j < segment.cars.length ; j++) {
otherCar = segment.cars[j];
otherCarW = otherCar.sprite.w * SPRITES.SCALE;
if ((car.speed > otherCar.speed) && Util.overlap(car.offset, carW, otherCar.offset, otherCarW, 1.2)) {
if (otherCar.offset > 0.5)
dir = -1;
else if (otherCar.offset < -0.5)
dir = 1;
else
dir = (car.offset > otherCar.offset) ? 1 : -1;
return dir * 1/i * (car.speed-otherCar.speed)/maxSpeed;
}
}
}
// if no cars ahead, but I have somehow ended up off road, then steer back on
if (car.offset < -0.9)
return 0.1;
else if (car.offset > 0.9)
return -0.1;
else
return 0;
}
//-------------------------------------------------------------------------
function updateHud(key, value) { // accessing DOM can be slow, so only do it if value has changed
if (hud[key].value !== value) {
hud[key].value = value;
Dom.set(hud[key].dom, value);
}
}
function formatTime(dt) {
var minutes = Math.floor(dt/60);
var seconds = Math.floor(dt - (minutes * 60));
var tenths = Math.floor(10 * (dt - Math.floor(dt)));
if (minutes > 0)
return minutes + "." + (seconds < 10 ? "0" : "") + seconds + "." + tenths;
else
return seconds + "." + tenths;
}
//=========================================================================
// RENDER THE GAME WORLD
//=========================================================================
function render() {
var baseSegment = findSegment(position);
var basePercent = Util.percentRemaining(position, segmentLength);
var playerSegment = findSegment(position+playerZ);
var playerPercent = Util.percentRemaining(position+playerZ, segmentLength);
var playerY = Util.interpolate(playerSegment.p1.world.y, playerSegment.p2.world.y, playerPercent);
var maxy = height;
var x = 0;
var dx = - (baseSegment.curve * basePercent);
ctx.clearRect(0, 0, width, height);
Render.background(ctx, background, width, height, BACKGROUND.SKY, skyOffset, resolution * skySpeed * playerY);
Render.background(ctx, background, width, height, BACKGROUND.HILLS, hillOffset, resolution * hillSpeed * playerY);
Render.background(ctx, background, width, height, BACKGROUND.TREES, treeOffset, resolution * treeSpeed * playerY);
var n, i, segment, car, sprite, spriteScale, spriteX, spriteY;
for(n = 0 ; n < drawDistance ; n++) {
segment = segments[(baseSegment.index + n) % segments.length];
segment.looped = segment.index < baseSegment.index;
segment.fog = Util.exponentialFog(n/drawDistance, fogDensity);
segment.clip = maxy;
Util.project(segment.p1, (playerX * roadWidth) - x, playerY + cameraHeight, position - (segment.looped ? trackLength : 0), cameraDepth, width, height, roadWidth);
Util.project(segment.p2, (playerX * roadWidth) - x - dx, playerY + cameraHeight, position - (segment.looped ? trackLength : 0), cameraDepth, width, height, roadWidth);
x = x + dx;
dx = dx + segment.curve;
if ((segment.p1.camera.z <= cameraDepth) || // behind us
(segment.p2.screen.y >= segment.p1.screen.y) || // back face cull
(segment.p2.screen.y >= maxy)) // clip by (already rendered) hill
continue;
Render.segment(ctx, width, lanes,
segment.p1.screen.x,
segment.p1.screen.y,
segment.p1.screen.w,
segment.p2.screen.x,
segment.p2.screen.y,
segment.p2.screen.w,
segment.fog,
segment.color);
maxy = segment.p1.screen.y;
}
for(n = (drawDistance-1) ; n > 0 ; n--) {
segment = segments[(baseSegment.index + n) % segments.length];
for(i = 0 ; i < segment.cars.length ; i++) {
car = segment.cars[i];
sprite = car.sprite;
spriteScale = Util.interpolate(segment.p1.screen.scale, segment.p2.screen.scale, car.percent);
spriteX = Util.interpolate(segment.p1.screen.x, segment.p2.screen.x, car.percent) + (spriteScale * car.offset * roadWidth * width/2);
spriteY = Util.interpolate(segment.p1.screen.y, segment.p2.screen.y, car.percent);
Render.sprite(ctx, width, height, resolution, roadWidth, sprites, car.sprite, spriteScale, spriteX, spriteY, -0.5, -1, segment.clip);
}
for(i = 0 ; i < segment.sprites.length ; i++) {
sprite = segment.sprites[i];
spriteScale = segment.p1.screen.scale;
spriteX = segment.p1.screen.x + (spriteScale * sprite.offset * roadWidth * width/2);
spriteY = segment.p1.screen.y;
Render.sprite(ctx, width, height, resolution, roadWidth, sprites, sprite.source, spriteScale, spriteX, spriteY, (sprite.offset < 0 ? -1 : 0), -1, segment.clip);
}
if (segment == playerSegment) {
Render.player(ctx, width, height, resolution, roadWidth, sprites, speed/maxSpeed,
cameraDepth/playerZ,
width/2,
(height/2) - (cameraDepth/playerZ * Util.interpolate(playerSegment.p1.camera.y, playerSegment.p2.camera.y, playerPercent) * height/2),
speed * (keyLeft ? -1 : keyRight ? 1 : 0),
playerSegment.p2.world.y - playerSegment.p1.world.y);
}
}
}
function findSegment(z) {
return segments[Math.floor(z/segmentLength) % segments.length];
}
//=========================================================================
// BUILD ROAD GEOMETRY
//=========================================================================
function lastY() { return (segments.length == 0) ? 0 : segments[segments.length-1].p2.world.y; }
function addSegment(curve, y) {
var n = segments.length;
segments.push({
index: n,
p1: { world: { y: lastY(), z: n *segmentLength }, camera: {}, screen: {} },
p2: { world: { y: y, z: (n+1)*segmentLength }, camera: {}, screen: {} },
curve: curve,
sprites: [],
cars: [],
color: Math.floor(n/rumbleLength)%2 ? COLORS.DARK : COLORS.LIGHT
});
}
function addSprite(n, sprite, offset) {
segments[n].sprites.push({ source: sprite, offset: offset });
}
function addRoad(enter, hold, leave, curve, y) {
var startY = lastY();
var endY = startY + (Util.toInt(y, 0) * segmentLength);
var n, total = enter + hold + leave;
for(n = 0 ; n < enter ; n++)
addSegment(Util.easeIn(0, curve, n/enter), Util.easeInOut(startY, endY, n/total));
for(n = 0 ; n < hold ; n++)
addSegment(curve, Util.easeInOut(startY, endY, (enter+n)/total));
for(n = 0 ; n < leave ; n++)
addSegment(Util.easeInOut(curve, 0, n/leave), Util.easeInOut(startY, endY, (enter+hold+n)/total));
}
var ROAD = {
LENGTH: { NONE: 0, SHORT: 25, MEDIUM: 50, LONG: 100 },
HILL: { NONE: 0, LOW: 20, MEDIUM: 40, HIGH: 60 },
CURVE: { NONE: 0, EASY: 2, MEDIUM: 4, HARD: 6 }
};
function addStraight(num) {
num = num || ROAD.LENGTH.MEDIUM;
addRoad(num, num, num, 0, 0);
}
function addHill(num, height) {
num = num || ROAD.LENGTH.MEDIUM;
height = height || ROAD.HILL.MEDIUM;
addRoad(num, num, num, 0, height);
}
function addCurve(num, curve, height) {
num = num || ROAD.LENGTH.MEDIUM;
curve = curve || ROAD.CURVE.MEDIUM;
height = height || ROAD.HILL.NONE;
addRoad(num, num, num, curve, height);
}
function addLowRollingHills(num, height) {
num = num || ROAD.LENGTH.SHORT;
height = height || ROAD.HILL.LOW;
addRoad(num, num, num, 0, height/2);
addRoad(num, num, num, 0, -height);
addRoad(num, num, num, ROAD.CURVE.EASY, height);
addRoad(num, num, num, 0, 0);
addRoad(num, num, num, -ROAD.CURVE.EASY, height/2);
addRoad(num, num, num, 0, 0);
}
function addSCurves() {
addRoad(ROAD.LENGTH.MEDIUM, ROAD.LENGTH.MEDIUM, ROAD.LENGTH.MEDIUM, -ROAD.CURVE.EASY, ROAD.HILL.NONE);
addRoad(ROAD.LENGTH.MEDIUM, ROAD.LENGTH.MEDIUM, ROAD.LENGTH.MEDIUM, ROAD.CURVE.MEDIUM, ROAD.HILL.MEDIUM);
addRoad(ROAD.LENGTH.MEDIUM, ROAD.LENGTH.MEDIUM, ROAD.LENGTH.MEDIUM, ROAD.CURVE.EASY, -ROAD.HILL.LOW);
addRoad(ROAD.LENGTH.MEDIUM, ROAD.LENGTH.MEDIUM, ROAD.LENGTH.MEDIUM, -ROAD.CURVE.EASY, ROAD.HILL.MEDIUM);
addRoad(ROAD.LENGTH.MEDIUM, ROAD.LENGTH.MEDIUM, ROAD.LENGTH.MEDIUM, -ROAD.CURVE.MEDIUM, -ROAD.HILL.MEDIUM);
}
function addBumps() {
addRoad(10, 10, 10, 0, 5);
addRoad(10, 10, 10, 0, -2);
addRoad(10, 10, 10, 0, -5);
addRoad(10, 10, 10, 0, 8);
addRoad(10, 10, 10, 0, 5);
addRoad(10, 10, 10, 0, -7);
addRoad(10, 10, 10, 0, 5);
addRoad(10, 10, 10, 0, -2);
}
function addDownhillToEnd(num) {
num = num || 200;
addRoad(num, num, num, -ROAD.CURVE.EASY, -lastY()/segmentLength);
}
function resetRoad() {
segments = [];
addStraight(ROAD.LENGTH.SHORT);
addLowRollingHills();
addSCurves();
addCurve(ROAD.LENGTH.MEDIUM, ROAD.CURVE.MEDIUM, ROAD.HILL.LOW);
addBumps();
addLowRollingHills();
addCurve(ROAD.LENGTH.LONG*2, ROAD.CURVE.MEDIUM, ROAD.HILL.MEDIUM);
addStraight();
addHill(ROAD.LENGTH.MEDIUM, ROAD.HILL.HIGH);
addSCurves();
addCurve(ROAD.LENGTH.LONG, -ROAD.CURVE.MEDIUM, ROAD.HILL.NONE);
addHill(ROAD.LENGTH.LONG, ROAD.HILL.HIGH);
addCurve(ROAD.LENGTH.LONG, ROAD.CURVE.MEDIUM, -ROAD.HILL.LOW);
addBumps();
addHill(ROAD.LENGTH.LONG, -ROAD.HILL.MEDIUM);
addStraight();
addSCurves();
addDownhillToEnd();
resetSprites();
resetCars();
segments[findSegment(playerZ).index + 2].color = COLORS.START;
segments[findSegment(playerZ).index + 3].color = COLORS.START;
for(var n = 0 ; n < rumbleLength ; n++)
segments[segments.length-1-n].color = COLORS.FINISH;
trackLength = segments.length * segmentLength;
}
function resetSprites() {
var n, i;
addSprite(20, SPRITES.BILLBOARD07, -1);
addSprite(40, SPRITES.BILLBOARD06, -1);
addSprite(60, SPRITES.BILLBOARD08, -1);
addSprite(80, SPRITES.BILLBOARD09, -1);
addSprite(100, SPRITES.BILLBOARD01, -1);
addSprite(120, SPRITES.BILLBOARD02, -1);
addSprite(140, SPRITES.BILLBOARD03, -1);
addSprite(160, SPRITES.BILLBOARD04, -1);
addSprite(180, SPRITES.BILLBOARD05, -1);
addSprite(240, SPRITES.BILLBOARD07, -1.2);
addSprite(240, SPRITES.BILLBOARD06, 1.2);
addSprite(segments.length - 25, SPRITES.BILLBOARD07, -1.2);
addSprite(segments.length - 25, SPRITES.BILLBOARD06, 1.2);
for(n = 10 ; n < 200 ; n += 4 + Math.floor(n/100)) {
addSprite(n, SPRITES.PALM_TREE, 0.5 + Math.random()*0.5);
addSprite(n, SPRITES.PALM_TREE, 1 + Math.random()*2);
}
for(n = 250 ; n < 1000 ; n += 5) {
addSprite(n, SPRITES.COLUMN, 1.1);
addSprite(n + Util.randomInt(0,5), SPRITES.TREE1, -1 - (Math.random() * 2));
addSprite(n + Util.randomInt(0,5), SPRITES.TREE2, -1 - (Math.random() * 2));
}
for(n = 200 ; n < segments.length ; n += 3) {
addSprite(n, Util.randomChoice(SPRITES.PLANTS), Util.randomChoice([1,-1]) * (2 + Math.random() * 5));
}
var side, sprite, offset;
for(n = 1000 ; n < (segments.length-50) ; n += 100) {
side = Util.randomChoice([1, -1]);
addSprite(n + Util.randomInt(0, 50), Util.randomChoice(SPRITES.BILLBOARDS), -side);
for(i = 0 ; i < 20 ; i++) {
sprite = Util.randomChoice(SPRITES.PLANTS);
offset = side * (1.5 + Math.random());
addSprite(n + Util.randomInt(0, 50), sprite, offset);
}
}
}
function resetCars() {
cars = [];
var n, car, segment, offset, z, sprite, speed;
for (var n = 0 ; n < totalCars ; n++) {
offset = Math.random() * Util.randomChoice([-0.8, 0.8]);
z = Math.floor(Math.random() * segments.length) * segmentLength;
sprite = Util.randomChoice(SPRITES.CARS);
speed = maxSpeed/4 + Math.random() * maxSpeed/(sprite == SPRITES.SEMI ? 4 : 2);
car = { offset: offset, z: z, sprite: sprite, speed: speed };
segment = findSegment(car.z);
segment.cars.push(car);
cars.push(car);
}
}
//=========================================================================
// THE GAME LOOP
//=========================================================================
Game.run({
canvas: canvas, render: render, update: update, stats: stats, step: step,
images: ["background", "sprites"],
keys: [
{ keys: [KEY.LEFT, KEY.A], mode: 'down', action: function() { keyLeft = true; } },
{ keys: [KEY.RIGHT, KEY.D], mode: 'down', action: function() { keyRight = true; } },
{ keys: [KEY.UP, KEY.W], mode: 'down', action: function() { keyFaster = true; } },
{ keys: [KEY.DOWN, KEY.S], mode: 'down', action: function() { keySlower = true; } },
{ keys: [KEY.LEFT, KEY.A], mode: 'up', action: function() { keyLeft = false; } },
{ keys: [KEY.RIGHT, KEY.D], mode: 'up', action: function() { keyRight = false; } },
{ keys: [KEY.UP, KEY.W], mode: 'up', action: function() { keyFaster = false; } },
{ keys: [KEY.DOWN, KEY.S], mode: 'up', action: function() { keySlower = false; } }
],
ready: function(images) {
background = images[0];
sprites = images[1];
reset();
Dom.storage.fast_lap_time = Dom.storage.fast_lap_time || 180;
updateHud('fast_lap_time', formatTime(Util.toFloat(Dom.storage.fast_lap_time)));
}
});
function reset(options) {
options = options || {};
canvas.width = width = Util.toInt(options.width, width);
canvas.height = height = Util.toInt(options.height, height);
lanes = Util.toInt(options.lanes, lanes);
roadWidth = Util.toInt(options.roadWidth, roadWidth);
cameraHeight = Util.toInt(options.cameraHeight, cameraHeight);
drawDistance = Util.toInt(options.drawDistance, drawDistance);
fogDensity = Util.toInt(options.fogDensity, fogDensity);
fieldOfView = Util.toInt(options.fieldOfView, fieldOfView);
segmentLength = Util.toInt(options.segmentLength, segmentLength);
rumbleLength = Util.toInt(options.rumbleLength, rumbleLength);
cameraDepth = 1 / Math.tan((fieldOfView/2) * Math.PI/180);
playerZ = (cameraHeight * cameraDepth);
resolution = height/480;
refreshTweakUI();
if ((segments.length==0) || (options.segmentLength) || (options.rumbleLength))
resetRoad(); // only rebuild road when necessary
}
//=========================================================================
// TWEAK UI HANDLERS
//=========================================================================
Dom.on('resolution', 'change', function(ev) {
var w, h, ratio;
switch(ev.target.options[ev.target.selectedIndex].value) {
case 'fine': w = 1280; h = 960; ratio=w/width; break;
case 'high': w = 1024; h = 768; ratio=w/width; break;
case 'medium': w = 640; h = 480; ratio=w/width; break;
case 'low': w = 480; h = 360; ratio=w/width; break;
}
reset({ width: w, height: h })
Dom.blur(ev);
});
Dom.on('lanes', 'change', function(ev) { Dom.blur(ev); reset({ lanes: ev.target.options[ev.target.selectedIndex].value }); });
Dom.on('roadWidth', 'change', function(ev) { Dom.blur(ev); reset({ roadWidth: Util.limit(Util.toInt(ev.target.value), Util.toInt(ev.target.getAttribute('min')), Util.toInt(ev.target.getAttribute('max'))) }); });
Dom.on('cameraHeight', 'change', function(ev) { Dom.blur(ev); reset({ cameraHeight: Util.limit(Util.toInt(ev.target.value), Util.toInt(ev.target.getAttribute('min')), Util.toInt(ev.target.getAttribute('max'))) }); });
Dom.on('drawDistance', 'change', function(ev) { Dom.blur(ev); reset({ drawDistance: Util.limit(Util.toInt(ev.target.value), Util.toInt(ev.target.getAttribute('min')), Util.toInt(ev.target.getAttribute('max'))) }); });
Dom.on('fieldOfView', 'change', function(ev) { Dom.blur(ev); reset({ fieldOfView: Util.limit(Util.toInt(ev.target.value), Util.toInt(ev.target.getAttribute('min')), Util.toInt(ev.target.getAttribute('max'))) }); });
Dom.on('fogDensity', 'change', function(ev) { Dom.blur(ev); reset({ fogDensity: Util.limit(Util.toInt(ev.target.value), Util.toInt(ev.target.getAttribute('min')), Util.toInt(ev.target.getAttribute('max'))) }); });
function refreshTweakUI() {
Dom.get('lanes').selectedIndex = lanes-1;
Dom.get('currentRoadWidth').innerHTML = Dom.get('roadWidth').value = roadWidth;
Dom.get('currentCameraHeight').innerHTML = Dom.get('cameraHeight').value = cameraHeight;
Dom.get('currentDrawDistance').innerHTML = Dom.get('drawDistance').value = drawDistance;
Dom.get('currentFieldOfView').innerHTML = Dom.get('fieldOfView').value = fieldOfView;
Dom.get('currentFogDensity').innerHTML = Dom.get('fogDensity').value = fogDensity;
}
//=========================================================================
</script>
</body>
</html>