18
是否在javascript中實現了Gideon Sundback谷歌塗鴉？Gideon Sundback拉鍊塗鴉[谷歌，4月24日]完全javascript？
我試圖通過螢火蟲追蹤，但不能真正「獲得」其實施細節？
關於如何實現它的任何想法？
A
回答
21
是的，它是JavaScript。使用<canvas>元素。
下面是代碼：
(function() {
var c = !0,
d = !1;
try {
window.google || (window.google = {});
google.doodle || (google.doodle = {});
var f = google.doodle,
h, j, k, l, m, n, o = 0,
p = 23,
q, r, s, u, v, w, x, y = 142,
z = 356,
A = 311,
B = 0,
C = 0,
D = 30,
E = 15,
F = d,
G, H = d,
I = d,
J = {
back: {
src: "/logos/2012/sundback12-hp-s.png",
height: 31,
width: 24,
x: 0,
y: 0
},
s: {
src: "/logos/2012/sundback12-hp-l.jpg",
height: 120,
width: 186,
x: 0,
y: 0
},
F: {
src: "/logos/2012/sundback12-hp-l.jpg",
height: 120,
width: 186,
x: 186,
y: 0
},
i: {
src: "/logos/2012/sundback12-hp-s.png",
height: 60,
width: 28,
x: 24,
y: 0
},
top: {
src: "/logos/2012/sundback12-hp-s.png",
height: 23,
width: 8,
x: 52,
y: 0
},
G: {
src: "/logos/2012/sundback12-hp-s.png",
height: 7,
width: 15,
x: 60,
y: 0
},
B: {
src: "/logos/2012/sundback12-hp-s.png",
height: 7,
width: 15,
x: 75,
y: 0
}
},
K = function() {
google.psy && google.nav && google.nav.go ? google.nav.go("https://stackoverflow.com/search?q=Gideon+Sundback&ct=sundback12-hp&oi=ddle") : window.location.href = "https://stackoverflow.com/search?q=Gideon+Sundback&ct=sundback12-hp&oi=ddle"
},
L = function (a, b, g, i, e) {
a.beginPath();
a.moveTo(b, g);
a.lineTo(i, e);
a.stroke()
},
M = function (a, b, g) {
var i = document.createElement("canvas"),
e = i.getContext("2d"),
t = j.createLinearGradient(0, 0, 0, g);
t.addColorStop(0, "#f5f5f5");
t.addColorStop(1, "#f1f1f1");
e.fillStyle = t;
e.fillRect(1, 1, b - 2, g - 2);
e.lineWidth = 1;
e.strokeStyle = "#d0d0d0";
L(e, 1, 0, b - 1, 0);
L(e, b, 1, b, g - 1);
L(e, b - 1, g, 1, g);
L(e, 0, g - 1, 0, 1);
e.fillStyle = "#444";
e.textAlign = "center";
e.font = "bold 11px Arial,sans-serif";
e.fillText(a, b/2, g * 2/3);
return i
},
N = function (a, b) {
var g = document.createElement("canvas"),
i = g.getContext("2d");
i.fillStyle = "#fff";
i.fillRect(0, 0, b, 29);
i.lineWidth = 1;
i.strokeStyle = "#c0c0c0";
L(i, 0, 0, b, 0);
i.strokeStyle = "#d9d9d9";
L(i, 0, 29, b, 29);
var e = a ? 0 : b;
L(i, e, 0, e, 29);
return g
},
O = "move,-ie-grabbing,-moz-grabbing,-o-grabbing,-webkit-grabbing,grabbing".split(","),
aa = "move,-ie-grab,-moz-grab,-o-grab,-webkit-grab,grab".split(","),
P = function (a, b) {
if (a) for (var g in b) a.style.cursor = b[g]
},
ba = function (a) {
if (!H && !Q()) {
F = H = c;
google.listen(window, "mouseup", R);
google.listen(window, "mousemove", S);
h.style.zIndex = "2000";
P(h, O);
k && P(k, O);
l.q.blur();
google.psy && K();
T();
S(a)
}
},
R = function() {
if (!I && H) {
I = c;
F = d;
h.style.cursor = "auto";
if (k) k.style.cursor = "auto";
ca()
}
},
S = function (a) {
if (F) {
a ? a.stopPropagation && a.stopPropagation() : window.event.cancelBubble = c;
a.preventDefault ? a.preventDefault() : a.returnValue = d;
a = a || window.event;
G = !a ? [0, 0] : [(a.clientX || a.targetTouches && a.targetTouches[0] && a.targetTouches[0].clientX || 0) + (document.body.scrollLeft || document.documentElement.scrollLeft || 0), (a.clientY || a.targetTouches && a.targetTouches[0] && a.targetTouches[0].clientY || 0) + (document.body.scrollTop || document.documentElement.scrollTop || 0)];
a = B;
B = Math.max(0, G[1] - o - 30 - J.i.height);
if (f.z > 0) {
f.z--;
var b = B - a;
Math.abs(b) > 50 && (B = a + b * 0.25)
}
U()
}
},
T = function() {
var a = document.getElementById("mgmhppd");
o = a ? a.offsetHeight : 0;
a = o + 30;
h.style.top = a + "px";
var b = document.getElementById("ftby");
if (b && b.parentNode) p = b.parentNode.offsetHeight;
h.height = x = document.body.clientHeight - (o + (H ? 0 : 30 + p));
var b = 833,
g = document.getElementById("gbqf");
g && (b = Math.max(b, g.offsetWidth));
h.width = v = Math.max(b, document.body.clientWidth);
w = v/2;
G || (G = [0, 0]);
G[0] = w;
if (k) {
b = k.style;
b.top = h.style.top;
b.left = w - 236 + "px";
if (l) b.height = google.style.getPageOffsetTop(l) - a + "px"
}
da();
U()
},
V = function (a) {
a.addColorStop(0, "rgba(255,255,255,0)");
a.addColorStop(0.01, "#eee");
a.addColorStop(0.55, "#fff");
a.addColorStop(0.58, "#b1b1b1");
a.addColorStop(0.68, "#dedede");
a.addColorStop(0.98, "#dedede");
a.addColorStop(0.99, "rgba(255,255,255,0)")
},
da = function() {
q = w - C + 1;
r = w + C;
s = q - 42;
u = r + 42
},
U = function() {
if (j) {
j.clearRect(0, 0, v, x);
var a = s - B,
b = u + B;
j.fillStyle = "#fff";
f.g || j.fillRect(0, 0, v, x);
j.beginPath();
j.moveTo(0, 0);
j.lineTo(a, 0);
j.arc(a, B, B + 21, -Math.PI/2, 0, d);
j.lineTo(s, x);
j.lineTo(0, x);
j.lineTo(0, 0);
j.fill();
j.beginPath();
j.moveTo(v, 0);
j.lineTo(b, 0);
j.arc(b, B, B + 21, -Math.PI/2, Math.PI, c);
j.lineTo(u, x);
j.lineTo(v, x);
j.lineTo(v, 0);
j.fill();
W(J.s, -42, y, c);
W(J.F, -42, y, d);
if (H) {
W(J.v, 0, A, c);
W(J.w, 0, A, d)
}
if (H) {
var g = !l || l.q.dir != "rtl";
W(J.search, -57, z, g);
W(J.C, -57, z, !g)
}
g = j.createRadialGradient(a, B, B, a, B, B + 42);
V(g);
j.fillStyle = g;
j.fillRect(a, 0, B + 42, B);
a = j.createRadialGradient(b, B, B, b, B, B + 42);
V(a);
j.fillStyle = a;
j.fillRect(r, 0, B + 42, B);
a = j.createLinearGradient(s, 0, q, 0);
V(a);
j.fillStyle = a;
j.fillRect(s, B, 42, x - B);
a = j.createLinearGradient(u, 0, r, 0);
V(a);
j.fillStyle = a;
j.fillRect(r, B, 42, x - B);
a = J.B.height + 5;
for (b = 0; b < x; b = b + a) {
W(J.G, 3, b + a/2, c);
W(J.B, 3, b, d)
}
a = A - 50;
a = Math.min(1, (a - (B - 50))/a);
if (H && a > 0) {
j.save();
j.globalAlpha = a;
W(J.v, 0, A, c);
W(J.w, 0, A, d);
j.restore()
}
X(J.back, r - J.back.width/2, B);
j.save();
a = 0;
G && (a = Math.atan((w - G[0])/J.i.height));
j.translate(r + a * 6, B + 12 + Math.abs(a) * 6);
j.rotate(a);
X(J.i, 0 - J.i.width/2, 0);
j.restore();
X(J.top, r - J.top.width/2, B + 5)
}
},
X = function (a, b, g) {
b > h.width || g > h.height || j.drawImage(a.a, a.x, a.y, a.width, a.height, b, g, a.width, a.height)
},
W = function (a, b, g, i) {
var e = i ? q : r;
if (g > B) {
e = i ? e + b - a.width : e - b;
X(a, e, g)
} else {
var t = 0;
B != 0 && (t = (B - g)/B);
b = B + 42 + b;
if (i) {
b = b - a.width;
e = e - 42 - B + Math.cos(t) * b
} else e = e + 42 + B - Math.cos(t) * b;
j.save();
j.translate(e, B - Math.sin(t) * b);
j.rotate(Math.PI * 2 + (i ? -t : t));
X(a, 0, 0);
j.restore()
}
},
ea = function() {
google.psy || Y()
},
Z = function (a) {
var b = document.getElementById("hplogo-i");
if (b) b.style.display = a ? "" : "none"
},
Y = function (a) {
window.clearTimeout(f.A);
if (n && m) n.style.position = m.style.position = "";
if (h && (!a || !google.psy && google.browser.product.FIREFOX)) h.style.display = "none";
if (k) k.style.display = "none";
Z(c);
google.unlisten(window, "resize", T);
google.unlisten(window, "mouseup", R);
google.unlisten(window, "mousemove", S)
},
fa = function() {
if (google.msg) {
f.o && google.msg.unlisten(40, f.o);
f.o = function() {
H || Y();
f.g = c;
google.msg.unlisten(40, f.o);
f.p ? Y() : U();
return c
};
google.msg.listen(40, f.o);
f.k && google.msg.unlisten(64, f.k);
f.k = function() {
T();
google.msg.unlisten(64, f.k);
return c
};
google.msg.listen(64, f.k);
f.n && google.msg.unlisten(67, f.n);
f.n = function() {
H || Y();
google.msg.unlisten(67, f.n);
return c
};
google.msg.listen(67, f.n)
}
},
Q = function() {
var a = window.location.href;
return a.indexOf("#") > -1 && /[^a-z]q=/.test(a) ? c : d
},
$ = function() {
if (!f.D && google.dstr && google.rein) {
f.D = c;
google.dstr.push(ea);
google.rein.push($)
}
f.cpDestroy = Y;
f.cpInit = $;
a: {
for (var a = document.forms, b = ["f", "gs", "tsf", "gbqf"], g = 0, i; i = b[g++];) if (i = a[i]) {
l = i;
break a
}
l = null
}
m = l.btnK;
n = l.btnI;
if (!(a = !l)) if (!(a = !l.q)) if (!(a = l.q.value.length > 0)) if (!(a = Q())) {
h = document.getElementById("hplogo-z");
if (!h) {
h = document.createElement("canvas");
document.body.appendChild(h)
}
if (h.getContext) {
j = h.getContext("2d");
Z(d);
h.id = "hplogo-z";
a = h.style;
a.left = "0";
a.position = "absolute";
a.display = "";
a.visibility = "";
a.zIndex = "-1";
if (k = document.getElementById("hplogo-c")) {
k.onmouseover = U;
k.onmousedown = ba;
k.ontouchstart = ba;
k.style.display = "";
P(k, aa)
}
a = c
} else a = d;
a = !a
}
if (a) Z(c);
else {
window.clearTimeout(f.A);
C = B = 0;
E = 15;
D = 30;
I = H = d;
f.g = d;
f.p = d;
f.z = 5;
f.g = d;
fa();
for (var e in J) {
a = J[e];
if (a.src) {
a.a = new Image;
a.a.onload = U;
a.a.src = a.src
}
}
if (l && n && m) {
J.search = {
a: M(m.innerText || m.textContent || m.value, m.offsetWidth, m.offsetHeight),
height: m.offsetHeight,
width: m.offsetWidth,
x: 0,
y: 0
};
J.C = {
a: M(n.innerText || n.textContent || n.value, n.offsetWidth, n.offsetHeight),
height: n.offsetHeight,
width: n.offsetWidth,
x: 0,
y: 0
};
e = Math.floor(google.style.getWidth(l.q)/2);
J.v = {
a: N(c, e),
height: 29,
width: e,
x: 0,
y: 0
};
J.w = {
a: N(d, e),
height: 29,
width: e,
x: 0,
y: 0
}
}
google.listen(window, "resize", T);
T();
y = Math.max(0, google.style.getPageOffsetTop(l) - o - 15 - J.s.height - 30);
z = google.style.getPageOffsetTop(m) - o - 30;
A = google.style.getPageOffsetTop(l) - o - 30;
if (l && n && m) {
b = google.style.getWidth(n) - google.style.getWidth(m);
a = e = 42;
b > 0 ? e = e + b : a = a - b;
b = l.q.dir != "rtl";
n.style.position = m.style.position = "relative";
n.style[b ? "left" : "right"] = e + "px";
m.style[b ? "right" : "left"] = a + "px"
}
U()
}
},
ca = function() {
B = B + D;
D = D + 2;
G[0] = G[0] + (w - G[0]) * 0.3;
if (B > x) {
C = C + E;
E = E + 5;
da()
}
U();
if (C < w) f.A = window.setTimeout(ca, 30);
else {
G[0] = w;
f.p = c;
if (google.psy && f.g) Y();
else {
Y(c);
K()
}
}
};
google.x ? google.x({
id: "DOODLE"
}, $) : $()
} catch (ga) {
google.ml(ga, d, {
cause: "DOODLE"
})
};
})();
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