This webpage was built entirely using only HTML5, basically CSS3 and JavaScript. With this project, I wanted to show using a real and interesting example, how we can combine the power of CSS3 3D transforms, with some of the new features and API's that HTML5 provides.
DEMO
HTML & JavaScript Code:
DEMO
HTML & JavaScript Code:
<!DOCTYPE HTML>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Fascinating - HTML5 CANVAS 3D CUBES demo</title>
<style>
html {
overflow: hidden;
}
body {
position: absolute;
margin: 0px;
padding: 0px;
background: #000;
width: 100%;
height: 100%;
}
#screen {
position: absolute;
width: 100%;
height: 100%;
background: #000;
overflow: hidden;
font-family: Segoe UI, Verdana, Arial, Sans-Serif;
color: #fff;
font-size: 13px;
}
#screen canvas {
position: absolute;
width: 100%;
height: 100%;
background: #000;
}
#info {
position: absolute;
text-align: left;
top: 19%;
left: 2%;
width: 180px;
height: 340px;
color: #666;
font-size: 1em;
}
#info .background {
position: absolute;
width: 100%;
height: 100%;
background: #000;
opacity: 0.3;
}
#info .content {
position: absolute;
padding: 3px;
width: 100%;
height: 100%;
}
#info .w {
color: #fff;
}
#info hr {
width: 90%;
border: none;
background-color: #666;
height: 1px;
}
#info h1 {
color: #fff;
text-align: center;
}
.button {
font-family: Arial, Helvetica, sans-serif;
font-size: 10px;
color: #ffffff;
padding: 10px 20px;
background: -moz-linear-gradient( top, #333333 0%, #000000);
background: -webkit-gradient( linear, left top, left bottom, from(#333333), to(#000000));
-moz-border-radius: 1px;
-webkit-border-radius: 1px;
border-radius: 1px;
border: 1px solid #000000;
-moz-box-shadow: 0px 1px 1px rgba(000,000,000,0.5), inset 0px 0px 1px rgba(255,255,255,1);
-webkit-box-shadow: 0px 1px 1px rgba(000,000,000,0.5), inset 0px 0px 1px rgba(255,255,255,1);
box-shadow: 0px 1px 1px rgba(000,000,000,0.5), inset 0px 0px 1px rgba(255,255,255,1);
text-shadow: 0px -1px 0px rgba(000,000,000,0.7), 0px 1px 0px rgba(255,255,255,0.3);
}
</style>
</head>
<body>
<h1 align="center" style="color:#fff;">Fascinating - HTML5 CANVAS 3D CUBES demo</h1>
<div id="screen">
<canvas id="canvas">HTML5 CANVAS</canvas>
<div id="info">
<div class="background"></div>
<div class="content">
<h1>3D Cubes</h1>
<table>
<tr>
<td class="w">drag</td>
<td>→ rotate X,Y axis</td>
</tr>
<tr>
<td class="w">wheel</td>
<td>→ rotate Z axis</td>
</tr>
<tr>
<td class="w">click</td>
<td>→ create cube</td>
</tr>
</table>
<hr>
<input type="checkbox" id="white">
<label for="white"> white background</label>
<br>
<input type="checkbox" id="alpha">
<label for="alpha"> transparency</label>
<br>
<input type="checkbox" id="autor">
<label for="autor"> auto rotation</label>
<br>
<input type="checkbox" id="destroy">
<label for="destroy"> destroy cubes</label>
<br>
<hr>
- <span id="fps" class="w">00</span> FPS<br>
- <span id="npoly" class="w">00</span> Faces<br>
<p align="center">
<input type="button" value="RESET" id="reset" class="button">
</input>
<input type="button" value="STOP" id="stopgo" class="button">
</input>
</p>
</div>
</div>
</div>
<script>
// =============================================================
// ===== CANVAS 3D experiment =====
// ===== simple 3D cubes HTML5 engine ====
// http://phpdevlovers.blogspot.in
// =============================================================
"use strict";
(function () {
// ======== private vars ========
var scr, canvas, cubes, faces, nx, ny, nw, nh, xm = 0, ym = 0, cx = 50, cy = 50, cz = 0, cxb = 0, cyb = 0;
var white, alpha, fps = 0, ncube, npoly, faceOver, drag, moved, startX = 0, startY = 0;
var cosY, sinY, cosX, sinX, cosZ, sinZ, minZ, angleY = 0, angleX = 0, angleZ = 0;
var bkgColor1 = "rgba(0,0,0,0.1)";
var bkgColor2 = "rgba(32,32,32,1)";
var autorotate = false, destroy = false, running = true;
// ---- fov ----
var fl = 250;
var zoom = 0;
// ======== canvas constructor ========
var Canvas = function (id) {
this.container = document.getElementById(id);
this.ctx = this.container.getContext("2d");
this.resize = function (w, h) {
this.container.width = w;
this.container.height = h;
}
};
// ======== vertex constructor ========
var Point = function (parent, xyz, project) {
this.project = project;
this.xo = xyz[0];
this.yo = xyz[1];
this.zo = xyz[2];
this.cube = parent;
};
Point.prototype.projection = function () {
// ---- 3D rotation ----
var x = cosY * (sinZ * this.yo + cosZ * this.xo) - sinY * this.zo;
var y = sinX * (cosY * this.zo + sinY * (sinZ * this.yo + cosZ * this.xo)) + cosX * (cosZ * this.yo - sinZ * this.xo);
var z = cosX * (cosY * this.zo + sinY * (sinZ * this.yo + cosZ * this.xo)) - sinX * (cosZ * this.yo - sinZ * this.xo);
this.x = x;
this.y = y;
this.z = z;
if (this.project) {
// ---- point visible ----
if (z < minZ) minZ = z;
this.visible = (zoom + z > 0);
// ---- 3D to 2D projection ----
this.X = (nw * 0.5) + x * (fl / (z + zoom));
this.Y = (nh * 0.5) + y * (fl / (z + zoom));
}
};
// ======= polygon constructor ========
var Face = function (cube, index, normalVector) {
// ---- parent cube ----
this.cube = cube;
// ---- coordinates ----
this.p0 = cube.points[index[0]];
this.p1 = cube.points[index[1]];
this.p2 = cube.points[index[2]];
this.p3 = cube.points[index[3]];
// ---- normal vector ----
this.normal = new Point(this, normalVector, false)
// ---- # faces ----
npoly++;
document.getElementById('npoly').innerHTML = npoly;
};
Face.prototype.pointerInside = function () {
// ---- Is Point Inside Triangle? ----
var fAB = function (p1, p2, p3) { return (ym - p1.Y) * (p2.X - p1.X) - (xm - p1.X) * (p2.Y - p1.Y); };
var fCA = function (p1, p2, p3) { return (ym - p3.Y) * (p1.X - p3.X) - (xm - p3.X) * (p1.Y - p3.Y); };
var fBC = function (p1, p2, p3) { return (ym - p2.Y) * (p3.X - p2.X) - (xm - p2.X) * (p3.Y - p2.Y); };
if (
fAB(this.p0, this.p1, this.p3) * fBC(this.p0, this.p1, this.p3) > 0 &&
fBC(this.p0, this.p1, this.p3) * fCA(this.p0, this.p1, this.p3) > 0
) return true;
if (
fAB(this.p1, this.p2, this.p3) * fBC(this.p1, this.p2, this.p3) > 0 &&
fBC(this.p1, this.p2, this.p3) * fCA(this.p1, this.p2, this.p3) > 0
) return true;
// ----
return false;
};
Face.prototype.faceVisible = function () {
// ---- points visible ----
if (this.p0.visible && this.p1.visible && this.p2.visible && this.p3.visible) {
// ---- back face culling ----
if ((this.p1.Y - this.p0.Y) / (this.p1.X - this.p0.X) < (this.p2.Y - this.p0.Y) / (this.p2.X - this.p0.X) ^ this.p0.X < this.p1.X == this.p0.X > this.p2.X) {
// ---- face visible ----
this.visible = true;
return true;
}
}
// ---- face hidden ----
this.visible = false;
this.distance = -99999;
return false;
};
Face.prototype.distanceToCamera = function () {
// ---- distance to camera ----
var dx = (this.p0.x + this.p1.x + this.p2.x + this.p3.x ) * 0.25;
var dy = (this.p0.y + this.p1.y + this.p2.y + this.p3.y ) * 0.25;
var dz = (zoom + fl) + (this.p0.z + this.p1.z + this.p2.z + this.p3.z ) * 0.25;
this.distance = Math.sqrt(dx * dx + dy * dy + dz * dz);
};
Face.prototype.draw = function () {
// ---- shape face ----
canvas.ctx.beginPath();
canvas.ctx.moveTo(this.p0.X, this.p0.Y);
canvas.ctx.lineTo(this.p1.X, this.p1.Y);
canvas.ctx.lineTo(this.p2.X, this.p2.Y);
canvas.ctx.lineTo(this.p3.X, this.p3.Y);
canvas.ctx.closePath();
// ---- light ----
if (this == faceOver) {
var r = 256;
var g = 0;
var b = 0;
} else {
// ---- flat (lambert) shading ----
this.normal.projection();
var light = (
white ?
this.normal.y + this.normal.z * 0.5 :
this.normal.z
) * 256;
var r = g = b = light;
}
// ---- fill ----
canvas.ctx.fillStyle = "rgba(" +
Math.round(r) + "," +
Math.round(g) + "," +
Math.round(b) + "," + this.cube.alpha + ")";
canvas.ctx.fill();
};
// ======== Cube constructor ========
var Cube = function(parent, nx, ny, nz, x, y, z, w) {
if (parent) {
// ---- translate parent points ----
this.w = parent.w;
this.points = [];
var i = 0, p;
while (p = parent.points[i++]) {
this.points.push(
new Point(
parent,
[p.xo + nx, p.yo + ny, p.zo + nz],
true
)
);
}
} else {
// ---- create points ----
this.w = w;
this.points = [];
var p = [
[x-w, y-w, z-w],
[x+w, y-w, z-w],
[x+w, y+w, z-w],
[x-w, y+w, z-w],
[x-w, y-w, z+w],
[x+w, y-w, z+w],
[x+w, y+w, z+w],
[x-w, y+w, z+w]
];
for (var i in p) this.points.push(
new Point(this, p[i], true)
);
}
// ---- faces coordinates ----
var f = [
[0,1,2,3],
[0,4,5,1],
[3,2,6,7],
[0,3,7,4],
[1,5,6,2],
[5,4,7,6]
];
// ---- faces normals ----
var nv = [
[0,0,1],
[0,1,0],
[0,-1,0],
[1,0,0],
[-1,0,0],
[0,0,-1]
];
// ---- cube transparency ----
this.alpha = alpha ? 0.5 : 1;
// ---- push faces ----
for (var i in f) {
faces.push(
new Face(this, f[i], nv[i])
);
}
ncube++;
};
////////////////////////////////////////////////////////////////////////////
var resize = function () {
// ---- screen resize ----
nw = scr.offsetWidth;
nh = scr.offsetHeight;
var o = scr;
for (nx = 0, ny = 0; o != null; o = o.offsetParent) {
nx += o.offsetLeft;
ny += o.offsetTop;
}
canvas.resize(nw, nh);
};
var reset = function () {
// ---- create first cube ----
cubes = [];
faces = [];
ncube = 0;
npoly = 0;
cubes.push(
new Cube(false,0,0,0,0,0,0,50)
);
};
var detectFaceOver = function () {
// ---- detect pointer over face ----
var j = 0, f;
faceOver = false;
while ( f = faces[j++] ) {
if (f.visible) {
if ( f.pointerInside() ) {
faceOver = f;
}
} else break;
}
};
var click = function () {
// ---- click cube ----
detectFaceOver();
if (faceOver) {
if (destroy) {
if (ncube > 1) {
var c = faceOver.cube;
faceOver.clicked = false;
// ---- destroy faces ----
var i = 0, f;
while ( f = faces[i++] ) {
if (f.cube == c) {
faces.splice(--i, 1);
npoly--;
}
}
document.getElementById('npoly').innerHTML = npoly;
// ---- destroy cube ----
var i = 0, o;
while ( o = cubes[i++] ) {
if (o == c) {
cubes.splice(--i, 1);
ncube--;
break;
}
}
}
} else {
if (!faceOver.clicked) {
// ---- create new cube ----
faceOver.clicked = true;
var w = -2.25 * faceOver.cube.w;
cubes.push(
new Cube(
faceOver.cube,
w * faceOver.normal.xo,
w * faceOver.normal.yo,
w * faceOver.normal.zo
)
);
detectFaceOver();
}
}
}
};
////////////////////////////////////////////////////////////////////////////
var init = function () {
// ---- init script ----
scr = document.getElementById("screen");
canvas = new Canvas("canvas");
// ======== unified touch/mouse events handler ========
scr.ontouchstart = scr.onmousedown = function (e) {
if (!running) return true;
// ---- touchstart ----
if (e.target !== canvas.container) return;
e.preventDefault(); // prevents scrolling
if (scr.setCapture) scr.setCapture();
moved = false;
drag = true;
startX = (e.clientX !== undefined ? e.clientX : e.touches[0].clientX) - nx;
startY = (e.clientY !== undefined ? e.clientY : e.touches[0].clientY) - ny;
};
scr.ontouchmove = scr.onmousemove = function(e) {
if (!running) return true;
// ---- touchmove ----
e.preventDefault();
xm = (e.clientX !== undefined ? e.clientX : e.touches[0].clientX) - nx;
ym = (e.clientY !== undefined ? e.clientY : e.touches[0].clientY) - ny;
detectFaceOver();
if (drag) {
cx = cxb + (xm - startX);
cy = cyb - (ym - startY);
}
if (Math.abs(xm - startX) > 10 || Math.abs(ym - startY) > 10) {
// ---- if pointer moves then cancel the tap/click ----
moved = true;
}
};
scr.ontouchend = scr.onmouseup = function(e) {
if (!running) return true;
// ---- touchend ----
e.preventDefault();
if (scr.releaseCapture) scr.releaseCapture();
drag = false;
cxb = cx;
cyb = cy;
if (!moved) {
// ---- click/tap ----
xm = startX;
ym = startY;
click();
}
};
scr.ontouchcancel = function(e) {
if (!running) return true;
// ---- reset ----
if (scr.releaseCapture) scr.releaseCapture();
moved = false;
drag = false;
cxb = cx;
cyb = cy;
startX = 0;
startY = 0;
};
// ---- Z axis rotation (mouse wheel) ----
scr.addEventListener('DOMMouseScroll', function(e) {
if (!running) return true;
cz += e.detail * 12;
return false;
}, false);
scr.onmousewheel = function () {
if (!running) return true;
cz += event.wheelDelta / 5;
return false;
}
// ---- multi-touch gestures ----
document.addEventListener('gesturechange', function(e) {
if (!running) return true;
e.preventDefault();
// ---- Z axis rotation ----
cz = event.rotation;
}, false);
// ---- screen size ----
resize();
window.addEventListener('resize', resize, false);
// ---- fps count ----
setInterval(function () {
document.getElementById('fps').innerHTML = fps * 2;
fps = 0;
}, 500); // update every 1/2 seconds
// ---- some UI options ----
document.getElementById("white").onchange = function () {
white = this.checked;
if (white) {
bkgColor1 = "rgba(256,256,256,0.1)";
bkgColor2 = "rgba(192,192,192,1)";
} else {
bkgColor1 = "rgba(0,0,0,0.1)";
bkgColor2 = "rgba(32,32,32,1)";
}
}
document.getElementById("alpha").onchange = function () {
alpha = this.checked;
}
document.getElementById("autor").onchange = function () {
autorotate = this.checked;
}
document.getElementById("destroy").onchange = function () {
destroy = this.checked;
}
document.getElementById("stopgo").onclick = function () {
running = !running;
document.getElementById("stopgo").value = running ? "STOP" : "GO!";
if (running) run();
}
document.getElementById("reset").onclick = function () {
reset();
}
// ---- engine start ----
reset();
run();
}
////////////////////////////////////////////////////////////////////////////
// ======== main loop ========
var run = function () {
// ---- screen background ----
canvas.ctx.fillStyle = bkgColor1;
canvas.ctx.fillRect(0, Math.floor(nh * 0.15), nw, Math.ceil(nh * 0.7));
canvas.ctx.fillStyle = bkgColor2;
canvas.ctx.fillRect(0, 0, nw, Math.ceil(nh * 0.15));
canvas.ctx.fillStyle = bkgColor2;
canvas.ctx.fillRect(0, Math.floor(nh * 0.85), nw, Math.ceil(nh * 0.15));
// ---- easing rotations ----
angleX += ((cy - angleX) * 0.05);
angleY += ((cx - angleY) * 0.05);
angleZ += ((cz - angleZ) * 0.05);
if (autorotate) cz += 1;
// ---- pre-calculating trigo ----
cosY = Math.cos(angleY * 0.01);
sinY = Math.sin(angleY * 0.01);
cosX = Math.cos(angleX * 0.01);
sinX = Math.sin(angleX * 0.01);
cosZ = Math.cos(angleZ * 0.01);
sinZ = Math.sin(angleZ * 0.01);
// ---- points projection ----
minZ = 0;
var i = 0, c;
while ( c = cubes[i++] ) {
var j = 0, p;
while ( p = c.points[j++] ) {
p.projection();
}
}
// ---- adapt zoom ----
var d = -minZ + 100 - zoom;
zoom += (d * ((d > 0) ? 0.05 : 0.01));
// ---- faces light ----
var j = 0, f;
while ( f = faces[j++] ) {
if ( f.faceVisible() ) {
f.distanceToCamera();
}
}
// ---- faces depth sorting ----
faces.sort(function (p0, p1) {
return p1.distance - p0.distance;
});
// ---- painting faces ----
j = 0;
while ( f = faces[j++] ) {
if (f.visible) {
f.draw();
} else break;
}
// ---- animation loop ----
fps++;
if (running) setTimeout(run, 16);
}
return {
////////////////////////////////////////////////////////////////////////////
// ---- onload event ----
load : function () {
window.addEventListener('load', function () {
init();
}, false);
}
}
})().load();
</script>
</body>
</html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Fascinating - HTML5 CANVAS 3D CUBES demo</title>
<style>
html {
overflow: hidden;
}
body {
position: absolute;
margin: 0px;
padding: 0px;
background: #000;
width: 100%;
height: 100%;
}
#screen {
position: absolute;
width: 100%;
height: 100%;
background: #000;
overflow: hidden;
font-family: Segoe UI, Verdana, Arial, Sans-Serif;
color: #fff;
font-size: 13px;
}
#screen canvas {
position: absolute;
width: 100%;
height: 100%;
background: #000;
}
#info {
position: absolute;
text-align: left;
top: 19%;
left: 2%;
width: 180px;
height: 340px;
color: #666;
font-size: 1em;
}
#info .background {
position: absolute;
width: 100%;
height: 100%;
background: #000;
opacity: 0.3;
}
#info .content {
position: absolute;
padding: 3px;
width: 100%;
height: 100%;
}
#info .w {
color: #fff;
}
#info hr {
width: 90%;
border: none;
background-color: #666;
height: 1px;
}
#info h1 {
color: #fff;
text-align: center;
}
.button {
font-family: Arial, Helvetica, sans-serif;
font-size: 10px;
color: #ffffff;
padding: 10px 20px;
background: -moz-linear-gradient( top, #333333 0%, #000000);
background: -webkit-gradient( linear, left top, left bottom, from(#333333), to(#000000));
-moz-border-radius: 1px;
-webkit-border-radius: 1px;
border-radius: 1px;
border: 1px solid #000000;
-moz-box-shadow: 0px 1px 1px rgba(000,000,000,0.5), inset 0px 0px 1px rgba(255,255,255,1);
-webkit-box-shadow: 0px 1px 1px rgba(000,000,000,0.5), inset 0px 0px 1px rgba(255,255,255,1);
box-shadow: 0px 1px 1px rgba(000,000,000,0.5), inset 0px 0px 1px rgba(255,255,255,1);
text-shadow: 0px -1px 0px rgba(000,000,000,0.7), 0px 1px 0px rgba(255,255,255,0.3);
}
</style>
</head>
<body>
<h1 align="center" style="color:#fff;">Fascinating - HTML5 CANVAS 3D CUBES demo</h1>
<div id="screen">
<canvas id="canvas">HTML5 CANVAS</canvas>
<div id="info">
<div class="background"></div>
<div class="content">
<h1>3D Cubes</h1>
<table>
<tr>
<td class="w">drag</td>
<td>→ rotate X,Y axis</td>
</tr>
<tr>
<td class="w">wheel</td>
<td>→ rotate Z axis</td>
</tr>
<tr>
<td class="w">click</td>
<td>→ create cube</td>
</tr>
</table>
<hr>
<input type="checkbox" id="white">
<label for="white"> white background</label>
<br>
<input type="checkbox" id="alpha">
<label for="alpha"> transparency</label>
<br>
<input type="checkbox" id="autor">
<label for="autor"> auto rotation</label>
<br>
<input type="checkbox" id="destroy">
<label for="destroy"> destroy cubes</label>
<br>
<hr>
- <span id="fps" class="w">00</span> FPS<br>
- <span id="npoly" class="w">00</span> Faces<br>
<p align="center">
<input type="button" value="RESET" id="reset" class="button">
</input>
<input type="button" value="STOP" id="stopgo" class="button">
</input>
</p>
</div>
</div>
</div>
<script>
// =============================================================
// ===== CANVAS 3D experiment =====
// ===== simple 3D cubes HTML5 engine ====
// http://phpdevlovers.blogspot.in
// =============================================================
"use strict";
(function () {
// ======== private vars ========
var scr, canvas, cubes, faces, nx, ny, nw, nh, xm = 0, ym = 0, cx = 50, cy = 50, cz = 0, cxb = 0, cyb = 0;
var white, alpha, fps = 0, ncube, npoly, faceOver, drag, moved, startX = 0, startY = 0;
var cosY, sinY, cosX, sinX, cosZ, sinZ, minZ, angleY = 0, angleX = 0, angleZ = 0;
var bkgColor1 = "rgba(0,0,0,0.1)";
var bkgColor2 = "rgba(32,32,32,1)";
var autorotate = false, destroy = false, running = true;
// ---- fov ----
var fl = 250;
var zoom = 0;
// ======== canvas constructor ========
var Canvas = function (id) {
this.container = document.getElementById(id);
this.ctx = this.container.getContext("2d");
this.resize = function (w, h) {
this.container.width = w;
this.container.height = h;
}
};
// ======== vertex constructor ========
var Point = function (parent, xyz, project) {
this.project = project;
this.xo = xyz[0];
this.yo = xyz[1];
this.zo = xyz[2];
this.cube = parent;
};
Point.prototype.projection = function () {
// ---- 3D rotation ----
var x = cosY * (sinZ * this.yo + cosZ * this.xo) - sinY * this.zo;
var y = sinX * (cosY * this.zo + sinY * (sinZ * this.yo + cosZ * this.xo)) + cosX * (cosZ * this.yo - sinZ * this.xo);
var z = cosX * (cosY * this.zo + sinY * (sinZ * this.yo + cosZ * this.xo)) - sinX * (cosZ * this.yo - sinZ * this.xo);
this.x = x;
this.y = y;
this.z = z;
if (this.project) {
// ---- point visible ----
if (z < minZ) minZ = z;
this.visible = (zoom + z > 0);
// ---- 3D to 2D projection ----
this.X = (nw * 0.5) + x * (fl / (z + zoom));
this.Y = (nh * 0.5) + y * (fl / (z + zoom));
}
};
// ======= polygon constructor ========
var Face = function (cube, index, normalVector) {
// ---- parent cube ----
this.cube = cube;
// ---- coordinates ----
this.p0 = cube.points[index[0]];
this.p1 = cube.points[index[1]];
this.p2 = cube.points[index[2]];
this.p3 = cube.points[index[3]];
// ---- normal vector ----
this.normal = new Point(this, normalVector, false)
// ---- # faces ----
npoly++;
document.getElementById('npoly').innerHTML = npoly;
};
Face.prototype.pointerInside = function () {
// ---- Is Point Inside Triangle? ----
var fAB = function (p1, p2, p3) { return (ym - p1.Y) * (p2.X - p1.X) - (xm - p1.X) * (p2.Y - p1.Y); };
var fCA = function (p1, p2, p3) { return (ym - p3.Y) * (p1.X - p3.X) - (xm - p3.X) * (p1.Y - p3.Y); };
var fBC = function (p1, p2, p3) { return (ym - p2.Y) * (p3.X - p2.X) - (xm - p2.X) * (p3.Y - p2.Y); };
if (
fAB(this.p0, this.p1, this.p3) * fBC(this.p0, this.p1, this.p3) > 0 &&
fBC(this.p0, this.p1, this.p3) * fCA(this.p0, this.p1, this.p3) > 0
) return true;
if (
fAB(this.p1, this.p2, this.p3) * fBC(this.p1, this.p2, this.p3) > 0 &&
fBC(this.p1, this.p2, this.p3) * fCA(this.p1, this.p2, this.p3) > 0
) return true;
// ----
return false;
};
Face.prototype.faceVisible = function () {
// ---- points visible ----
if (this.p0.visible && this.p1.visible && this.p2.visible && this.p3.visible) {
// ---- back face culling ----
if ((this.p1.Y - this.p0.Y) / (this.p1.X - this.p0.X) < (this.p2.Y - this.p0.Y) / (this.p2.X - this.p0.X) ^ this.p0.X < this.p1.X == this.p0.X > this.p2.X) {
// ---- face visible ----
this.visible = true;
return true;
}
}
// ---- face hidden ----
this.visible = false;
this.distance = -99999;
return false;
};
Face.prototype.distanceToCamera = function () {
// ---- distance to camera ----
var dx = (this.p0.x + this.p1.x + this.p2.x + this.p3.x ) * 0.25;
var dy = (this.p0.y + this.p1.y + this.p2.y + this.p3.y ) * 0.25;
var dz = (zoom + fl) + (this.p0.z + this.p1.z + this.p2.z + this.p3.z ) * 0.25;
this.distance = Math.sqrt(dx * dx + dy * dy + dz * dz);
};
Face.prototype.draw = function () {
// ---- shape face ----
canvas.ctx.beginPath();
canvas.ctx.moveTo(this.p0.X, this.p0.Y);
canvas.ctx.lineTo(this.p1.X, this.p1.Y);
canvas.ctx.lineTo(this.p2.X, this.p2.Y);
canvas.ctx.lineTo(this.p3.X, this.p3.Y);
canvas.ctx.closePath();
// ---- light ----
if (this == faceOver) {
var r = 256;
var g = 0;
var b = 0;
} else {
// ---- flat (lambert) shading ----
this.normal.projection();
var light = (
white ?
this.normal.y + this.normal.z * 0.5 :
this.normal.z
) * 256;
var r = g = b = light;
}
// ---- fill ----
canvas.ctx.fillStyle = "rgba(" +
Math.round(r) + "," +
Math.round(g) + "," +
Math.round(b) + "," + this.cube.alpha + ")";
canvas.ctx.fill();
};
// ======== Cube constructor ========
var Cube = function(parent, nx, ny, nz, x, y, z, w) {
if (parent) {
// ---- translate parent points ----
this.w = parent.w;
this.points = [];
var i = 0, p;
while (p = parent.points[i++]) {
this.points.push(
new Point(
parent,
[p.xo + nx, p.yo + ny, p.zo + nz],
true
)
);
}
} else {
// ---- create points ----
this.w = w;
this.points = [];
var p = [
[x-w, y-w, z-w],
[x+w, y-w, z-w],
[x+w, y+w, z-w],
[x-w, y+w, z-w],
[x-w, y-w, z+w],
[x+w, y-w, z+w],
[x+w, y+w, z+w],
[x-w, y+w, z+w]
];
for (var i in p) this.points.push(
new Point(this, p[i], true)
);
}
// ---- faces coordinates ----
var f = [
[0,1,2,3],
[0,4,5,1],
[3,2,6,7],
[0,3,7,4],
[1,5,6,2],
[5,4,7,6]
];
// ---- faces normals ----
var nv = [
[0,0,1],
[0,1,0],
[0,-1,0],
[1,0,0],
[-1,0,0],
[0,0,-1]
];
// ---- cube transparency ----
this.alpha = alpha ? 0.5 : 1;
// ---- push faces ----
for (var i in f) {
faces.push(
new Face(this, f[i], nv[i])
);
}
ncube++;
};
////////////////////////////////////////////////////////////////////////////
var resize = function () {
// ---- screen resize ----
nw = scr.offsetWidth;
nh = scr.offsetHeight;
var o = scr;
for (nx = 0, ny = 0; o != null; o = o.offsetParent) {
nx += o.offsetLeft;
ny += o.offsetTop;
}
canvas.resize(nw, nh);
};
var reset = function () {
// ---- create first cube ----
cubes = [];
faces = [];
ncube = 0;
npoly = 0;
cubes.push(
new Cube(false,0,0,0,0,0,0,50)
);
};
var detectFaceOver = function () {
// ---- detect pointer over face ----
var j = 0, f;
faceOver = false;
while ( f = faces[j++] ) {
if (f.visible) {
if ( f.pointerInside() ) {
faceOver = f;
}
} else break;
}
};
var click = function () {
// ---- click cube ----
detectFaceOver();
if (faceOver) {
if (destroy) {
if (ncube > 1) {
var c = faceOver.cube;
faceOver.clicked = false;
// ---- destroy faces ----
var i = 0, f;
while ( f = faces[i++] ) {
if (f.cube == c) {
faces.splice(--i, 1);
npoly--;
}
}
document.getElementById('npoly').innerHTML = npoly;
// ---- destroy cube ----
var i = 0, o;
while ( o = cubes[i++] ) {
if (o == c) {
cubes.splice(--i, 1);
ncube--;
break;
}
}
}
} else {
if (!faceOver.clicked) {
// ---- create new cube ----
faceOver.clicked = true;
var w = -2.25 * faceOver.cube.w;
cubes.push(
new Cube(
faceOver.cube,
w * faceOver.normal.xo,
w * faceOver.normal.yo,
w * faceOver.normal.zo
)
);
detectFaceOver();
}
}
}
};
////////////////////////////////////////////////////////////////////////////
var init = function () {
// ---- init script ----
scr = document.getElementById("screen");
canvas = new Canvas("canvas");
// ======== unified touch/mouse events handler ========
scr.ontouchstart = scr.onmousedown = function (e) {
if (!running) return true;
// ---- touchstart ----
if (e.target !== canvas.container) return;
e.preventDefault(); // prevents scrolling
if (scr.setCapture) scr.setCapture();
moved = false;
drag = true;
startX = (e.clientX !== undefined ? e.clientX : e.touches[0].clientX) - nx;
startY = (e.clientY !== undefined ? e.clientY : e.touches[0].clientY) - ny;
};
scr.ontouchmove = scr.onmousemove = function(e) {
if (!running) return true;
// ---- touchmove ----
e.preventDefault();
xm = (e.clientX !== undefined ? e.clientX : e.touches[0].clientX) - nx;
ym = (e.clientY !== undefined ? e.clientY : e.touches[0].clientY) - ny;
detectFaceOver();
if (drag) {
cx = cxb + (xm - startX);
cy = cyb - (ym - startY);
}
if (Math.abs(xm - startX) > 10 || Math.abs(ym - startY) > 10) {
// ---- if pointer moves then cancel the tap/click ----
moved = true;
}
};
scr.ontouchend = scr.onmouseup = function(e) {
if (!running) return true;
// ---- touchend ----
e.preventDefault();
if (scr.releaseCapture) scr.releaseCapture();
drag = false;
cxb = cx;
cyb = cy;
if (!moved) {
// ---- click/tap ----
xm = startX;
ym = startY;
click();
}
};
scr.ontouchcancel = function(e) {
if (!running) return true;
// ---- reset ----
if (scr.releaseCapture) scr.releaseCapture();
moved = false;
drag = false;
cxb = cx;
cyb = cy;
startX = 0;
startY = 0;
};
// ---- Z axis rotation (mouse wheel) ----
scr.addEventListener('DOMMouseScroll', function(e) {
if (!running) return true;
cz += e.detail * 12;
return false;
}, false);
scr.onmousewheel = function () {
if (!running) return true;
cz += event.wheelDelta / 5;
return false;
}
// ---- multi-touch gestures ----
document.addEventListener('gesturechange', function(e) {
if (!running) return true;
e.preventDefault();
// ---- Z axis rotation ----
cz = event.rotation;
}, false);
// ---- screen size ----
resize();
window.addEventListener('resize', resize, false);
// ---- fps count ----
setInterval(function () {
document.getElementById('fps').innerHTML = fps * 2;
fps = 0;
}, 500); // update every 1/2 seconds
// ---- some UI options ----
document.getElementById("white").onchange = function () {
white = this.checked;
if (white) {
bkgColor1 = "rgba(256,256,256,0.1)";
bkgColor2 = "rgba(192,192,192,1)";
} else {
bkgColor1 = "rgba(0,0,0,0.1)";
bkgColor2 = "rgba(32,32,32,1)";
}
}
document.getElementById("alpha").onchange = function () {
alpha = this.checked;
}
document.getElementById("autor").onchange = function () {
autorotate = this.checked;
}
document.getElementById("destroy").onchange = function () {
destroy = this.checked;
}
document.getElementById("stopgo").onclick = function () {
running = !running;
document.getElementById("stopgo").value = running ? "STOP" : "GO!";
if (running) run();
}
document.getElementById("reset").onclick = function () {
reset();
}
// ---- engine start ----
reset();
run();
}
////////////////////////////////////////////////////////////////////////////
// ======== main loop ========
var run = function () {
// ---- screen background ----
canvas.ctx.fillStyle = bkgColor1;
canvas.ctx.fillRect(0, Math.floor(nh * 0.15), nw, Math.ceil(nh * 0.7));
canvas.ctx.fillStyle = bkgColor2;
canvas.ctx.fillRect(0, 0, nw, Math.ceil(nh * 0.15));
canvas.ctx.fillStyle = bkgColor2;
canvas.ctx.fillRect(0, Math.floor(nh * 0.85), nw, Math.ceil(nh * 0.15));
// ---- easing rotations ----
angleX += ((cy - angleX) * 0.05);
angleY += ((cx - angleY) * 0.05);
angleZ += ((cz - angleZ) * 0.05);
if (autorotate) cz += 1;
// ---- pre-calculating trigo ----
cosY = Math.cos(angleY * 0.01);
sinY = Math.sin(angleY * 0.01);
cosX = Math.cos(angleX * 0.01);
sinX = Math.sin(angleX * 0.01);
cosZ = Math.cos(angleZ * 0.01);
sinZ = Math.sin(angleZ * 0.01);
// ---- points projection ----
minZ = 0;
var i = 0, c;
while ( c = cubes[i++] ) {
var j = 0, p;
while ( p = c.points[j++] ) {
p.projection();
}
}
// ---- adapt zoom ----
var d = -minZ + 100 - zoom;
zoom += (d * ((d > 0) ? 0.05 : 0.01));
// ---- faces light ----
var j = 0, f;
while ( f = faces[j++] ) {
if ( f.faceVisible() ) {
f.distanceToCamera();
}
}
// ---- faces depth sorting ----
faces.sort(function (p0, p1) {
return p1.distance - p0.distance;
});
// ---- painting faces ----
j = 0;
while ( f = faces[j++] ) {
if (f.visible) {
f.draw();
} else break;
}
// ---- animation loop ----
fps++;
if (running) setTimeout(run, 16);
}
return {
////////////////////////////////////////////////////////////////////////////
// ---- onload event ----
load : function () {
window.addEventListener('load', function () {
init();
}, false);
}
}
})().load();
</script>
</body>
</html>
