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racer.js
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(function (window, localStorage, Math, document, setTimeout, round, floor) {
var requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame;
var drawImage = 'drawImage';
function $ (id) {
return document.getElementById(id);
}
function vibrate () {
try {
navigator.vibrate(100);
} catch (e) {
}
}
var playSound = (function() {
var soundContext = window.AudioContext || window.webkitAudioContext, lastV = 0, gain = 0;
if (!soundContext) {
return function () {};
}
soundContext = new soundContext();
var oscillator = soundContext.createOscillator();
oscillator.frequency.value = 220;
var modulationGain = soundContext.createGain();
modulationGain.gain.value = 0;
oscillator.connect(modulationGain);
modulationGain.connect(soundContext.destination);
oscillator.start();
return function (v) {
if (v < 0) {
gain = 0;
} else {
oscillator.frequency.value = 220 * Math.pow(2, v);
gain = Util_limit(gain + 10 * Math.abs(lastV - v) - 0.02, 0, 0.5);
lastV = v;
}
modulationGain.gain.value = gain;
};
})();
function getKey (style, car, road) {
return style + '-' + car + '-' + road;
}
var localStorageKey = 'racer-records';
function updateRecord (key, time) {
var old, all;
if (time.length > 9) {
return false;
}
old = getRecord(key);
if (!old || old > time) {
try {
all = JSON.parse(localStorage[localStorageKey] || '{}');
all[key] = time;
localStorage[localStorageKey] = JSON.stringify(all);
return true;
} catch (e) {
}
}
return false;
}
function getRecord (key) {
try {
return JSON.parse(localStorage[localStorageKey])[key];
} catch (e) {
}
}
var COLORS, SPRITES;
//=========================================================================
// general purpose helpers (mostly math)
//=========================================================================
function Util_timestamp() { return Date.now(); }
function Util_toInt(obj, def) { if (obj !== null) { var x = parseInt(obj, 10); if (!isNaN(x)) return x; } return Util_toInt(def, 0); }
function Util_toFloat(obj, def) { if (obj !== null) { var x = parseFloat(obj); if (!isNaN(x)) return x; } return Util_toFloat(def, 0.0); }
function Util_limit(value, min, max) { return Math.max(min, Math.min(value, max)); }
function Util_randomInt(min, max) { return round(Util_interpolate(min, max, Math.random())); }
function Util_randomChoice(options) { return options[Util_randomInt(0, options.length-1)]; }
function Util_percentRemaining(n, total) { return (n%total)/total; }
function Util_accelerate(v, accel, dt) { return v + (accel * dt); }
function Util_interpolate(a,b,percent) { return a + (b-a)*percent }
function Util_easeIn(a,b,percent) { return a + (b-a)*Math.pow(percent,2); }
function Util_easeOut(a,b,percent) { return a + (b-a)*(1-Math.pow(1-percent,2)); }
function Util_easeInOut(a,b,percent) { return a + (b-a)*((-Math.cos(percent*Math.PI)/2) + 0.5); }
function Util_exponentialFog(distance, density) { return 1 / (Math.pow(Math.E, (distance * distance * density))); }
function Util_increase(start, increment, max) { // with looping
var result = start + increment;
while (result >= max)
result -= max;
while (result < 0)
result += max;
return result;
}
function Util_project(p, cameraX, cameraY, cameraZ, cameraDepth, width, height, roadWidth) {
p.c.x = (p.w.x || 0) - cameraX;
p.c.y = (p.w.y || 0) - cameraY;
p.c.z = (p.w.z || 0) - cameraZ;
p.s.s = cameraDepth/p.c.z;
p.s.x = round((width/2) + (p.s.s * p.c.x * width/2));
p.s.y = round((height/2) - (p.s.s * p.c.y * height/2));
p.s.w = round( (p.s.s * roadWidth * width/2));
}
function Util_overlap(x1, w1, x2, w2, percent) {
var half = (percent || 1)/2;
var min1 = x1 - (w1*half);
var max1 = x1 + (w1*half);
var min2 = x2 - (w2*half);
var max2 = x2 + (w2*half);
return ! ((max1 < min2) || (min1 > max2));
}
//=========================================================================
// canvas rendering helpers
//=========================================================================
function Render_polygon(ctx, x1, y1, x2, y2, x3, y3, x4, y4, color) {
ctx.fillStyle = color;
ctx.beginPath();
ctx.moveTo(x1, y1);
ctx.lineTo(x2, y2);
ctx.lineTo(x3, y3);
ctx.lineTo(x4, y4);
ctx.closePath();
ctx.fill();
}
//---------------------------------------------------------------------------
function Render_segment(ctx, width, lanes, x1, y1, w1, x2, y2, w2, fog, color) {
var r1 = Render_rumbleWidth(w1, lanes),
r2 = Render_rumbleWidth(w2, lanes),
l1 = Render_laneMarkerWidth(w1, lanes),
l2 = Render_laneMarkerWidth(w2, lanes),
lanew1, lanew2, lanex1, lanex2, lane;
ctx.fillStyle = color.g;
ctx.fillRect(0, y2, width, y1 - y2);
Render_polygon(ctx, x1-w1-r1, y1, x1-w1, y1, x2-w2, y2, x2-w2-r2, y2, color.R);
Render_polygon(ctx, x1+w1+r1, y1, x1+w1, y1, x2+w2, y2, x2+w2+r2, y2, color.R);
Render_polygon(ctx, x1-w1, y1, x1+w1, y1, x2+w2, y2, x2-w2, y2, color.r);
if (color.l) {
lanew1 = w1*2/lanes;
lanew2 = w2*2/lanes;
lanex1 = x1 - w1 + lanew1;
lanex2 = x2 - w2 + lanew2;
for(lane = 1 ; lane < lanes ; lanex1 += lanew1, lanex2 += lanew2, lane++)
Render_polygon(ctx, lanex1 - l1/2, y1, lanex1 + l1/2, y1, lanex2 + l2/2, y2, lanex2 - l2/2, y2, color.l);
}
Render_fog(ctx, 0, y1, width, y2-y1, fog);
}
//---------------------------------------------------------------------------
function Render_background(ctx, background, width, height, layer, rotation, offset) {
rotation = rotation || 0;
offset = offset || 0;
var imageW = layer.w/2;
var imageH = layer.h;
var sourceX = layer.x + floor(layer.w * rotation);
var sourceY = layer.y
var sourceW = Math.min(imageW, layer.x+layer.w-sourceX);
var sourceH = imageH;
var destX = 0;
var destY = offset;
var destW = floor(width * (sourceW/imageW));
var destH = height;
if (sourceW)
ctx[drawImage](background, sourceX, sourceY, sourceW, sourceH, destX, destY, destW, destH);
if (sourceW < imageW)
ctx[drawImage](background, layer.x, sourceY, imageW-sourceW, sourceH, destW, destY, width-destW, destH); //destW - 1?
}
//---------------------------------------------------------------------------
function Render_sprite(ctx, width, height, resolution, roadWidth, sprites, sprite, scale, destX, destY, offsetX, offsetY, clipY) {
// scale for projection AND relative to roadWidth (for tweakUI)
var destW = (sprite.w * scale * width/2) * (SPRITES.SCALE * roadWidth);
var destH = (sprite.h * scale * width/2) * (SPRITES.SCALE * roadWidth);
destX = destX + (destW * (offsetX || 0));
destY = destY + (destH * (offsetY || 0));
var clipH = clipY ? Math.max(0, destY+destH-clipY) : 0;
if (clipH < destH)
ctx[drawImage](sprites, sprite.x, sprite.y, sprite.w, sprite.h - (sprite.h*clipH/destH), destX, destY, destW, destH - clipH);
}
//---------------------------------------------------------------------------
function Render_player(ctx, width, height, resolution, roadWidth, sprites, speedPercent, scale, destX, destY, steer, updown) {
var bounce = (1.5 * Math.random() * speedPercent * resolution) * Util_randomChoice([-1,1]);
var sprite;
if (steer < 0)
sprite = SPRITES.PLAYER_LEFT;//(updown > 0) ? SPRITES.PLAYER_UPHILL_LEFT : SPRITES.PLAYER_LEFT;
else if (steer > 0)
sprite = SPRITES.PLAYER_RIGHT;//(updown > 0) ? SPRITES.PLAYER_UPHILL_RIGHT : SPRITES.PLAYER_RIGHT;
else
sprite = SPRITES.PLAYER_STRAIGHT;//(updown > 0) ? SPRITES.PLAYER_UPHILL_STRAIGHT : SPRITES.PLAYER_STRAIGHT;
Render_sprite(ctx, width, height, resolution, roadWidth, sprites, sprite, scale, destX, destY + bounce, -0.5, -1);
}
//---------------------------------------------------------------------------
function Render_fog(ctx, x, y, width, height, fog) {
if (fog < 1) {
ctx.globalAlpha = (1-fog)
ctx.fillStyle = COLORS.FOG;
ctx.fillRect(x, y, width, height);
ctx.globalAlpha = 1;
}
}
function Render_rumbleWidth(projectedRoadWidth, lanes) { return projectedRoadWidth/Math.max(6, 2*lanes); }
function Render_laneMarkerWidth(projectedRoadWidth, lanes) { return projectedRoadWidth/Math.max(32, 8*lanes); }
var BACKGROUND = {
HILLS: { x: 5, y: 5, w: 1280, h: 480 },
SKY: { x: 5, y: 495, w: 1280, h: 480 },
TREES: { x: 5, y: 985, w: 1280, h: 480 }
};
function setColorsSprites (style, carColor) {
SPRITES={
PLAYER_LEFT: {x: 800, y: 42 * carColor, w: 80, h: 41},
PLAYER_STRAIGHT: {x: 880, y: 42 * carColor, w: 80, h: 41},
PLAYER_RIGHT: {x: 960, y: 42 * carColor, w: 80, h: 41},
C1: {x: 880, y: 0, w: 80, h: 41},
C2: {x: 880, y: 42, w: 80, h: 41},
C3: {x: 880, y: 84, w: 80, h: 41},
C4: {x: 880, y: 126, w: 80, h: 41},
B1: {x: 5, y: 0, w: 350, h: 285},
B2: {x: 400, y: 0, w: 350, h: 285},
P1: {x: 30, y: 310, w: 385, h: 400},
P2: {x: 470, y: 310, w: 360, h: 400},
P3: {x: 900, y: 300, w: 390, h: 420},
P4: {x: 40, y: 820, w: 430, h: 460},
P5: {x: 500, y: 810, w: 260, h: 240},
X: {x: 1400, y: 5, w: 30, h: 700}
};
SPRITES.CARS=[SPRITES.C1,SPRITES.C2,SPRITES.C3,SPRITES.C4];
SPRITES.SCALE = 0.3 * (1/SPRITES.PLAYER_STRAIGHT.w);
switch(style) {
case 0: //forest
COLORS = {
SKY: '#72D7EE',
TREE: '#005108',
FOG: '#005108',
HILL: {t: '#be5', m: '#22a822', b: '#1a1'},
LIGHT: { r: '#6B6B6B', g: '#1a1', R: '#555', l: '#ccc' }, //r: road, g: grass, R: rumble, l: lane
DARK: { r: '#696969', g: '#090', R: '#bbb' },
START: { r: '#ccc', g: '#5f5', R: '#ccc' },
FINISH: { r: '#333', g: '#050', R: '#333' }
};
SPRITES.OBJECTS=[SPRITES.B1,SPRITES.B2,SPRITES.P1,SPRITES.P2,SPRITES.P2,SPRITES.X];
break;
case 1: //desert
COLORS = {
SKY: '#77f',
TREE: '#880',
FOG: '#884',
HILL: {t: '#ff5', m: '#ee3', b: '#dd0'},
LIGHT: { r: '#6B6B6B', g: '#dd0', R: '#f00', l: '#ccc' },
DARK: { r: '#696969', g: '#bb0', R: '#bbb' },
START: { r: '#ccc', g: '#ff3', R: '#ccc' },
FINISH: { r: '#333', g: '#880', R: '#333' }
};
SPRITES.OBJECTS=[SPRITES.B1,SPRITES.B2,SPRITES.P4,SPRITES.P4,SPRITES.P5,SPRITES.X];
break;
case 2: //snow
COLORS = {
SKY: '#8af',
TREE: '#888',
FOG: '#aaa',
HILL: {t: '#fff', m: '#ddd', b: '#aaa'},
LIGHT: { r: '#bbb', g: '#eef', R: '#f00', l: '#ccc' },
DARK: { r: '#aaa', g: '#dde', R: '#bbb' },
START: { r: '#ccc', g: '#fff', R: '#ccc' },
FINISH: { r: '#555', g: '#555', R: '#555' }
};
SPRITES.OBJECTS=[SPRITES.B1,SPRITES.B2,SPRITES.P1,SPRITES.P1,SPRITES.P3,SPRITES.X];
}
}
var dataUri = 'data:image/svg+xml;base64,', svgPre = '<?xml version="1.0" encoding="UTF-8"?><svg xmlns="http://www.w3.org/2000/svg" width="';
function getCarImg (c, turn) {
var svg = turn ? '150" height="102"><g style="stroke:#000;stroke-width:0.5px"><path d="m 13,80 8,0 0,0 0,15 L 21,94 c 0,0 -5,0 -8,-1 -1,-4 1,-13 0,-13 z" style="fill:#222"/><path d="m 16,52 c -2,4 -6,22 -5,28 0,3 2,5 5,4 -1,-2 1,-4 1,-6 -2,-3 -3,-8 2,-10 -1,-4 0,-14 2,-20 -4,1 -3,1 -5,4 z" style="fill:#eee;stroke:none"/><path d="m 20,74 c 0,0 -2,-16 0,-25 1,-2 2,0 3,-2 19,-16 27,-31 36,-33 13,-4 65,-1 65,-1 6,2 24,29 21,31 3,8 -4,20 -7,29 -12,5 -78,8 -118,1 z" style="fill:#ddd;stroke:none"/><path d="m 147,61 c -2,-3 -6,-6 -4,-8 1,-13 0,-17 -2,-19 9,-3 6,23 6,27 z" style="fill:#eee;stroke:none"/><path d="m 132,43 c -1,-2 -9,-17 -9,-23 0,-2 1,-1 3,-5 3,2 6,5 13,16 0,4 -5,9 -7,12 z" style="fill:#222"/><path d="m 148,81 -10,0 0,0 -2,17 c -1,0 8,0 12,-1 1,-4 -1,-16 0,-16 z" style="fill:#222"/><path d="m 149,51 c 0,0 1,22 0,29 -1,2 -7,4 -10,3 1,-2 1,-3 1,-4 2,-4 5,-10 -1,-11 1,-4 1,-11 2,-17 3,-2 8,-1 8,0 z" style="fill:#eee;stroke:none"/><path d="m 15,73 c -1,8 -1,15 3,22 0,0 2,1 3,2 1,0 1,1 2,1 -4,1 65,7 111,2 2,0 3,-4 3,-4 4,-5 3,-12 5,-20 1,-1 -1,-2 0,-3 -43,3 -83,4 -127,0 z" style="fill:#aaa;stroke:none"/><path d="m 120,50 -96,-1 -6,9 c 0,8 1,16 1,16 1,0 3,0 4,0 l 0,0 c 11,0 74,1 103,1 5,-1 7,0 9,-1 1,-2 1,-6 1,-7 -1,-3 0,-6 -1,-10 z" style="fill:#ccc;stroke:none"/><path d="m 19,69 c -8,1 -4,7 3,8 4,1 101,5 114,2 5,-1 10,-7 4,-11 -2,-1 1,6 -10,7 -35,0 -72,0 -102,-2 -4,0 -10,0 -9,-4 z" style="fill:#ddd;stroke:none"/><path d="m 20,94 c 37,2 76,4 112,3 l 1,-6 c -39,2 -75,1 -115,-3 z" style="fill:#222"/><path d="m 19,58 c 0,2 13,0 18,2 3,1 6,8 3,9 -2,1 -12,3 -19,0 -4,-2 -2,-6 -2,-11 z" style="fill:#800"/><path d="m 135,60 c 0,2 -18,0 -23,2 -3,0 -7,8 -4,9 2,1 16,2 23,0 6,-3 4,-6 4,-11 z" style="fill:#800"/><rect x="57" y="57" width="46" height="9" transform="matrix(1,0.012,-0.012,1,0,0)" style="fill:#fff;fill-opacity:0.7"/><path d="m 34,41 c 3,-4 10,-12 19,-21 17,-2 58,-2 67,0 2,7 2,14 4,22 z" style="fill:#222"/><path d="m 125,17 13,18" style="fill:#aaa;stroke:#999"/><path d="m 24,49 10,-8" style="fill:none"/><path d="m 120,51 4,-9" style="fill:none"/><path d="m 141,38 -1,2 2,0 z" style="fill:#333"/><path d="m 138,36 c 2,3 4,10 3,15" style="fill:none"/></g></svg>' : '151" height="103"><g style="stroke-width:0.5px;stroke:#000"><path d="m 6,80 10,0 0,0 0,18 c 0,0 0,0 0,0 0,0 -6,1 -9,0 -1,-4 0,-18 -1,-18 z" style="fill:#222"/><path d="m 8,51 c -2,4 -4,23 -4,29 2,3 4,6 7,4 -1,-1 1,-5 0,-6 -1,-3 -3,-8 4,-10 -1,-4 0,-14 1,-20 -4,2 -5,0 -8,3 z" style="fill:#eee;stroke:none"/><path d="m 15,75 c 0,0 -3,-17 1,-27 15,-13 18,-25 27,-33 12,-4 51,-4 65,-1 10,8 18,31 26,33 2,9 4,17 1,27 -13,5 -79,8 -120,1 z" style="fill:#ddd;stroke:none"/><path d="m 144,80 -9,2 0,0 0,17 c 0,0 0,0 0,0 -1,-1 5,0 9,0 2,-5 0,-19 0,-19 z" style="fill:#222"/><path d="m 142,51 c 2,4 4,23 4,28 -2,3 -4,5 -7,4 1,-1 0,-5 1,-7 2,-2 2,-6 -5,-8 1,-4 0,-14 -1,-21 4,1 5,1 8,4 z" style="fill:#eee;stroke:none"/><path d="m 10,72 c 0,10 1,18 5,26 0,0 4,4 4,2 -3,2 65,6 112,0 3,0 5,-2 5,-2 4,-7 4,-16 4,-24 -42,2 -85,4 -130,-2 z" style="fill:#aaa;stroke:none"/><path d="m 124,50 -98,0 -12,8 c 0,8 1,16 1,16 1,0 3,0 4,1 0,0 0,0 0,0 11,0 75,0 103,0 6,-1 10,-1 12,-3 2,-5 2,-10 1,-16 l -11,-6 z" style="fill:#ccc;stroke:none"/><path d="m 15,68 c -8,2 -7,12 3,12 2,0 101,2 114,-1 6,0 14,-7 4,-11 -2,-1 0,6 -10,6 -35,1 -71,2 -102,1 -4,-1 -9,-1 -9,-7 z" style="fill:#ddd;stroke:none"/><path d="m 18,96 c 37,3 80,2 116,0 l 1,-5 c -40,3 -79,4 -120,0 z" style="fill:#222"/><path d="m 15,59 c -1,3 17,1 23,3 4,0 6,8 4,9 -3,1 -16,3 -24,0 -6,-3 -4,-7 -3,-12 z" style="fill:#800"/><path d="m 135,59 c 1,3 -17,1 -23,3 -4,0 -6,8 -4,9 3,0 16,1 24,0 6,-3 4,-7 3,-12 z" style="fill:#800"/><rect x="51" y="62" width="46" height="9" style="fill:#fff;fill-opacity:0.7;"/><path d="m 30,41 c 1,-5 2,-9 12,-21 20,-1 42,-1 68,0 4,7 9,13 10,21 z" style="fill:#222"/><path d="m 27,50 3,-9"/><path d="m 124,50 -4,-9"/></g></svg>';
c = [
['#e00', '#d00', '#c00', '#a00'],
['#00e', '#00d', '#00c', '#00a'],
['#ee0', '#dd0', '#cc0', '#aa0'],
['#0e0', '#0d0', '#0c0', '#0a0']
][c];
svg = svgPre + svg.replace(/#eee/g, c[0]).replace(/#ddd/g, c[1]).replace(/#ccc/g, c[2]).replace(/#aaa/g, c[3]);
return dataUri + btoa(svg);
}
function getTree () {
var svg = svgPre + '430" height="333"><g fill="#050"><text font-family="sans-serif" x="0" y="117" font-size="117">🌲🌳🎄</text><text font-family="sans-serif" x="0" y="300" font-size="133">🌴</text><text font-family="sans-serif" x="167" y="233" font-size="67">🌵</text></g></svg>';
return dataUri + btoa(svg);
}
function makeBackground () {
var c = document.createElement('canvas');
var bezierCurveTo = 'bezierCurveTo';
c.width = 1290;
c.height = 1470;
var canvas = c.getContext('2d');
var grad1 = canvas.createLinearGradient(0, 0, 0, 485),
grad2 = canvas.createLinearGradient(5, 495, 5, 975);
grad1.addColorStop(0.15, COLORS.HILL.t);
grad1.addColorStop(0.5, COLORS.HILL.m);
grad1.addColorStop(1, COLORS.HILL.b);
canvas.fillStyle = grad1;
canvas.beginPath();
canvas.moveTo(5, 485);
canvas.lineTo(1285, 485);
canvas.lineTo(1285, 120);
canvas[bezierCurveTo](1100, 180, 1100, 80, 1000, 90);
canvas[bezierCurveTo](900, 100, 900, 130, 800, 140);
canvas[bezierCurveTo](700, 150, 700, 85, 650, 85);
canvas[bezierCurveTo](600, 85, 600, 90, 580, 100);
canvas[bezierCurveTo](560, 110, 460, 30, 390, 40);
canvas[bezierCurveTo](320, 50, 310, 120, 250, 130);
canvas[bezierCurveTo](190, 140, 190, 60, 5, 120);
canvas.closePath();
canvas.fill();
grad2.addColorStop(0, COLORS.SKY);
grad2.addColorStop(0.4, '#fff');
canvas.fillStyle = grad2;
canvas.beginPath();
canvas.moveTo(5, 495);
canvas.lineTo(5, 975);
canvas.lineTo(1285, 975);
canvas.lineTo(1285, 495);
canvas.closePath();
canvas.fill();
canvas.fillStyle = '#fff';
canvas.beginPath();
canvas.arc(180, 535, 10, 0, 2 * Math.PI);
canvas.arc(200, 530, 20, 0, 2 * Math.PI);
canvas.arc(210, 520, 15, 0, 2 * Math.PI);
canvas.arc(220, 530, 15, 0, 2 * Math.PI);
canvas.closePath();
canvas.fill();
canvas.beginPath();
canvas.arc(380, 545, 10, 0, 2 * Math.PI);
canvas.arc(400, 540, 20, 0, 2 * Math.PI);
canvas.arc(410, 530, 10, 0, 2 * Math.PI);
canvas.arc(420, 540, 15, 0, 2 * Math.PI);
canvas.arc(430, 540, 10, 0, 2 * Math.PI);
canvas.closePath();
canvas.fill();
canvas.beginPath();
canvas.arc(680, 545, 10, 0, 2 * Math.PI);
canvas.arc(695, 540, 20, 0, 2 * Math.PI);
canvas.arc(710, 535, 15, 0, 2 * Math.PI);
canvas.arc(720, 540, 15, 0, 2 * Math.PI);
canvas.closePath();
canvas.fill();
canvas.beginPath();
canvas.arc(980, 555, 10, 0, 2 * Math.PI);
canvas.arc(1000, 550, 20, 0, 2 * Math.PI);
canvas.arc(1010, 555, 15, 0, 2 * Math.PI);
canvas.closePath();
canvas.fill();
canvas.fillStyle = COLORS.TREE;
canvas.beginPath();
canvas.moveTo(5, 1175);
canvas.lineTo(5, 1465);
canvas.lineTo(1285, 1465);
canvas.lineTo(1285, 1175);
var y = 1175;
for (var x = 1285; x > 5; x--) {
y += round(Math.random() * 2 - 1 - (y - 1175) / x);
canvas.lineTo(x, y);
}
canvas.closePath();
canvas.fill();
return c;
}
function makeSprites (cars) {
var c = document.createElement('canvas');
c.width = 1492;
c.height = 1487;
var canvas = c.getContext('2d');
var grad = canvas.createLinearGradient(0, 5, 0, 255);
grad.addColorStop(0, '#ff0');
grad.addColorStop(1, '#c80');
canvas.strokeStyle = '#000';
canvas.lineWidth = 6;
canvas.fillStyle = grad;
canvas.rect(5, 5, 350, 250);
canvas.fill();
canvas.moveTo(5, 255)
canvas.lineTo(5, 285);
canvas.moveTo(355, 255)
canvas.lineTo(355, 285);
canvas.rect(400, 5, 350, 250);
canvas.fill();
canvas.moveTo(400, 255)
canvas.lineTo(400, 285);
canvas.moveTo(750, 255)
canvas.lineTo(750, 285);
canvas.stroke();
canvas.font = '100px sans-serif';
canvas.fillStyle = '#c00';
canvas.fillText('Fire!', 75, 155);
canvas.fillText('Fox!', 475, 155);
/*canvas.font = '350px sans-serif';
canvas.fillStyle = '#050';
canvas.fillText('🌲🌳🎄', 0, 650);
canvas.font = '400px sans-serif';
canvas.fillText('🌴', 0, 1200);
canvas.font = '200px sans-serif';
canvas.fillText('🌵', 500, 1000);*/
canvas.fillStyle = '#ccc';
canvas.beginPath();
canvas.rect(1400, 5, 30, 700);
canvas.fill();
var c2 = document.createElement('canvas');
c2.width = 430;
c2.height = 333;
//drawing emojis directly on a canvas doesn't work at all
//drawing them via SVG in a big size makes them monochrome
//so draw them from SVG to canvas first and scale up then
c2.getContext('2d')[drawImage](cars[8], 0, 0); //plants
canvas[drawImage](c2, 0, 300, 1290, 999);
//sizes are wrong, but doesn't matter
canvas[drawImage](cars[0], 880,0, 80,41);
canvas[drawImage](cars[1], 960,0, 80,41);
canvas[drawImage](cars[2], 880,42, 80,41);
canvas[drawImage](cars[3], 960,42, 80,41);
canvas[drawImage](cars[4], 880,84, 80,41);
canvas[drawImage](cars[5], 960,84, 80,41);
canvas[drawImage](cars[6], 880,126, 80,41);
canvas[drawImage](cars[7], 960,126, 80,41);
canvas.scale(-1, 1);
canvas[drawImage](cars[1], -880,0, 80,41);
canvas[drawImage](cars[3], -880,42, 80,41);
canvas[drawImage](cars[5], -880,84, 80,41);
canvas[drawImage](cars[7], -880,126, 80,41);
return c;
};
function loadImages (names, callback) { // load multiple images and callback when ALL images have loaded
var result = [];
var count = names.length;
var onload = function() {
if (--count == 0)
callback(result);
};
for(var n = 0 ; n < names.length ; n++) {
var name = names[n];
result[n] = document.createElement('img');
result[n].onload = onload;
result[n].src = name;
}
}
var details = 2; //1 for slow devices, up to 20 for fast
var fps = 60; // how many 'update' frames per second
var step = 1/fps; // how long is each frame (in seconds)
var width = 320;//480; // logical canvas width
var height = 240;//360; // 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 canvas = $('c'); // 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 = 10 * details; // total number of cars on the road
var lapCount = 0;
var currentTime = 0;
var totalLaps = 1;
var keyLeft = false;
var keyRight = false;
var keyFaster = false;
var keySlower = false;
function resize () {
var docEl = document.documentElement, w = docEl.clientWidth, h = docEl.clientHeight, scale, style;
if (w / h > width / height) {
scale = h / height;
} else {
scale = w / width;
}
style = canvas.style;
style.transform = 'scale(' + scale + ')';
style.top = ((scale - 1) * height / 2) + 'px';
style.left = ((scale - 1) * width / 2 + (w - width * scale) / 2) + 'px';
style.display = 'block';
}
//=========================================================================
// 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.s.length ; n++) {
sprite = playerSegment.s[n];
spriteW = sprite.source.w * SPRITES.SCALE;
if (Util_overlap(playerX, playerW, sprite.o + spriteW/2 * (sprite.o > 0 ? 1 : -1), spriteW)) {
if (speed > maxSpeed/4) vibrate();
speed = maxSpeed/5;
position = Util_increase(playerSegment.p1.w.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.o, carW, 0.8)) {
speed = car.speed * (car.speed/speed);
position = Util_increase(car.z, -playerZ, trackLength);
vibrate();
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
playSound(speed/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);
currentTime += dt;
if (position > playerZ && startPosition < playerZ) {
lapCount++;
if (lapCount > totalLaps) {
lapCount = totalLaps;
return true;
}
}
}
//-------------------------------------------------------------------------
function updateCars(dt, playerSegment, playerW) {
var n, car, oldSegment, newSegment, index;
for(n = 0 ; n < cars.length ; n++) {
car = cars[n];
oldSegment = findSegment(car.z);
car.o = car.o + 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.n - playerSegment.n) > drawDistance)
return 0;
for(i = 1 ; i < lookahead ; i++) {
segment = segments[(carSegment.n+i)%segments.length];
if ((segment === playerSegment) && (car.speed > speed) && (Util_overlap(playerX, playerW, car.o, carW, 1.2))) {
if (playerX > 0.5)
dir = -1;
else if (playerX < -0.5)
dir = 1;
else
dir = (car.o > 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.o, carW, otherCar.o, otherCarW, 1.2)) {
if (otherCar.o > 0.5)
dir = -1;
else if (otherCar.o < -0.5)
dir = 1;
else
dir = (car.o > otherCar.o) ? 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.o < -0.9)
return 0.1;
else if (car.o > 0.9)
return -0.1;
else
return 0;
}
//-------------------------------------------------------------------------
function formatTime(dt) {
var minutes = floor(dt/60);
var seconds = floor(dt - (minutes * 60));
var tenths = floor(10 * (dt - floor(dt)));
if (minutes < 10) {
minutes = ' ' + minutes;
}
return minutes + ":" + (seconds < 10 ? "0" : "") + 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.w.y, playerSegment.p2.w.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.n + n) % segments.length];
segment.looped = segment.n < baseSegment.n;
segment.f = 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.c.z <= cameraDepth) || // behind us
(segment.p2.s.y >= segment.p1.s.y) || // back face cull
(segment.p2.s.y >= maxy)) // clip by (already rendered) hill
continue;
Render_segment(ctx, width, lanes,
segment.p1.s.x,
segment.p1.s.y,
segment.p1.s.w,
segment.p2.s.x,
segment.p2.s.y,
segment.p2.s.w,
segment.f,
segment.c);
maxy = segment.p1.s.y;
}
for(n = (drawDistance-1) ; n > 0 ; n--) {
segment = segments[(baseSegment.n + n) % segments.length];
for(i = 0 ; i < segment.cars.length ; i++) {
car = segment.cars[i];
sprite = car.sprite;
spriteScale = Util_interpolate(segment.p1.s.s, segment.p2.s.s, car.percent);
spriteX = Util_interpolate(segment.p1.s.x, segment.p2.s.x, car.percent) + (spriteScale * car.o * roadWidth * width/2);
spriteY = Util_interpolate(segment.p1.s.y, segment.p2.s.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.s.length ; i++) {
sprite = segment.s[i];
spriteScale = segment.p1.s.s;
spriteX = segment.p1.s.x + (spriteScale * sprite.o * roadWidth * width/2);
spriteY = segment.p1.s.y;
Render_sprite(ctx, width, height, resolution, roadWidth, sprites, sprite.source, spriteScale, spriteX, spriteY, (sprite.o < 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.c.y, playerSegment.p2.c.y, playerPercent) * height/2),
speed * (keyLeft ? -1 : keyRight ? 1 : 0),
playerSegment.p2.w.y - playerSegment.p1.w.y);
}
}
ctx.font = '12px monospace';
ctx.fillStyle = '#000';
ctx.fillText((' ' + 5 * round(speed/500) + ' mph').slice(-7), 10, 15);
ctx.fillText(formatTime(currentTime), width / 2 - 30, 15);
ctx.fillText('Lap ' + lapCount + ' of ' + totalLaps, width - 80, 15);
}
function findSegment(z) {
return segments[floor(z/segmentLength) % segments.length];
}
//=========================================================================
// BUILD ROAD GEOMETRY
//=========================================================================
function lastY() { return (segments.length == 0) ? 0 : segments[segments.length-1].p2.w.y; }
function addSegment(curve, y) {
var n = segments.length;
segments.push({
n: n,
p1: { w: { y: lastY(), z: n *segmentLength }, c: {}, s: {} }, //world, camera, screen
p2: { w: { y: y, z: (n+1)*segmentLength }, c: {}, s: {} },
curve: curve,
s: [],
cars: [],
c: floor(n/rumbleLength)%2 ? COLORS.DARK : COLORS.LIGHT
});
}
function addSprite(n, sprite, offset) {
segments[n].s.push({ source: sprite, o: 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, ROAD_LENGTH_SHORT= 25, ROAD_LENGTH_MEDIUM= 50, ROAD_LENGTH_LONG= 100,
ROAD_HILL_NONE= 0, ROAD_HILL_LOW= 20, ROAD_HILL_MEDIUM= 40, ROAD_HILL_HIGH= 60,
ROAD_CURVE_NONE= 0, ROAD_CURVE_EASY= 2, ROAD_CURVE_MEDIUM= 4, ROAD_CURVE_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 makeRoad1 () {
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();
totalLaps = 2;
}
function makeRoad2 () {
addStraight(ROAD_LENGTH_LONG);
addBumps();
addStraight(ROAD_LENGTH_LONG);
addCurve(0,-ROAD_CURVE_MEDIUM);
addCurve(0,-ROAD_CURVE_MEDIUM);
addHill();
addCurve(0,-ROAD_CURVE_MEDIUM);
addCurve(0,-ROAD_CURVE_MEDIUM);
addStraight(ROAD_LENGTH_LONG);
addBumps();
addStraight(ROAD_LENGTH_LONG);
addCurve(0,-ROAD_CURVE_MEDIUM);
addCurve(0,-ROAD_CURVE_MEDIUM);
addDownhillToEnd();
totalLaps = 4;
}
function resetRoad(r) {
segments = [];
if (r === 0) {
makeRoad1();
}else if (r===1){
makeRoad2();
}else {
makeRoad1();
totalLaps = 1;
}
resetSprites();
resetCars();
segments[findSegment(playerZ).n + 2].c = COLORS.START;
segments[findSegment(playerZ).n + 3].c = COLORS.START;
for(var n = 0 ; n < rumbleLength ; n++)
segments[segments.length-1-n].c = COLORS.FINISH;
trackLength = segments.length * segmentLength;
}
function resetSprites() {
var i;
for (i = 0; i < segments.length; i += round(segments.length/(20 * details))) {
addSprite((i + segments.length + Util_randomInt(-5, 5)) % segments.length, Util_randomChoice(SPRITES.OBJECTS), Util_randomChoice([1,-1]) * (1 + Math.random() * 2));
}
}
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 = floor(Math.random() * segments.length) * segmentLength;
sprite = Util_randomChoice(SPRITES.CARS);
speed = maxSpeed/4 + Math.random() * maxSpeed/2;
car = { o: offset, z: z, sprite: sprite, speed: speed };
segment = findSegment(car.z);
segment.cars.push(car);