我正在尝试实现 Google balls HTML5 canvas logo在我的网站上(最终我会将“Google”一词更改为我的名字)。但是，我已经有一个菜单，我无法让 Logo 显示在菜单上方。
当我评论我的 CSS3 的最后一个 block 时(如下所示)， Logo 出现在顶部，但菜单消失了。
这是我现在得到的(没有评论我的 CSS3 中的最后一个 block ):
请注意，在 Google 球和菜单上方都有 60 像素的菜单边距。理想情况下，我想将菜单边距增加到 150 像素左右，然后在菜单上方居中添加“myName”球。
这是 HTML5 代码:
GoogleBalls.html:
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="css/style.css">
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<script type="text/javascript" src="js/main.js"></script>
<title>myHomepage</title>
</head>
<body>
<canvas id= "c" width="400" height="400"></canvas>
<ul id="menu">
<li><a href="#">Home</a></li>
<li><a href="#">Blog</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Contact</a></li>
</ul>
</body>
</html>
我的 CSS3 代码:
样式.css:
/* This is for the menu */
#menu, #menu ul {
margin: 0;
padding: 0;
list-style: none;
}
#menu {
width: 960px;
margin: 60px auto;
border: 1px solid #222;
background-color: #111;
background: -webkit-gradient(linear, center top, center bottom, from(#444), to(#111));
border-radius: 6px;
box-shadow: 0 1px 1px #777;
}
#menu:before,
#menu:after {
content: "";
display: table;
}
#menu:after {
clear: both;
}
#menu li {
float: left;
border-right: 1px solid #222;
box-shadow: 1px 0 0 #444;
position: relative;
}
#menu a {
float: left;
padding: 12px 30px;
color: #999;
text-transform: uppercase;
font: bold 12px Arial, Helvetica;
text-decoration: none;
text-shadow: 0 1px 0 #000;
}
/* This is for Google balls */
/* If I comment the following, I will see Google balls at
* the top of the page (which is what I want), but the menu disappears!*/
#c {
position: absolute;
}
我的 javascript 代码:
主要.js:
$(function() {
var canvas = $("#c");
var canvasHeight;
var canvasWidth;
var ctx;
var dt = 0.1;
var pointCollection;
function init() {
updateCanvasDimensions();
var g = [new Point(202, 78, 0.0, 9, "#ed9d33"), new Point(348, 83, 0.0, 9, "#d44d61"),
new Point(256, 69, 0.0, 9, "#4f7af2"), new Point(214, 59, 0.0, 9, "#ef9a1e"), new Point(265, 36, 0.0, 9, "#4976f3"),
new Point(300, 78, 0.0, 9, "#269230"), new Point(294, 59, 0.0, 9, "#1f9e2c"), new Point(45, 88, 0.0, 9, "#1c48dd"),
new Point(268, 52, 0.0, 9, "#2a56ea"), new Point(73, 83, 0.0, 9, "#3355d8"), new Point(294, 6, 0.0, 9, "#36b641"),
new Point(235, 62, 0.0, 9, "#2e5def"), new Point(353, 42, 0.0, 8, "#d53747"), new Point(336, 52, 0.0, 8, "#eb676f"),
new Point(208, 41, 0.0, 8, "#f9b125"), new Point(321, 70, 0.0, 8, "#de3646"), new Point(8, 60, 0.0, 8, "#2a59f0"),
new Point(180, 81, 0.0, 8, "#eb9c31"), new Point(146, 65, 0.0, 8, "#c41731"), new Point(145, 49, 0.0, 8, "#d82038"),
new Point(246, 34, 0.0, 8, "#5f8af8"), new Point(169, 69, 0.0, 8, "#efa11e"), new Point(273, 99, 0.0, 8, "#2e55e2"),
new Point(248, 120, 0.0, 8, "#4167e4"), new Point(294, 41, 0.0, 8, "#0b991a"), new Point(267, 114, 0.0, 8, "#4869e3"),
new Point(78, 67, 0.0, 8, "#3059e3"), new Point(294, 23, 0.0, 8, "#10a11d"), new Point(117, 83, 0.0, 8, "#cf4055"),
new Point(137, 80, 0.0, 8, "#cd4359"), new Point(14, 71, 0.0, 8, "#2855ea"),
new Point(331, 80, 0.0, 8, "#ca273c"), new Point(25, 82, 0.0, 8, "#2650e1"), new Point(233, 46, 0.0, 8, "#4a7bf9"),
new Point(73, 13, 0.0, 8, "#3d65e7"), new Point(327, 35, 0.0, 6, "#f47875"), new Point(319, 46, 0.0, 6, "#f36764"),
new Point(256, 81, 0.0, 6, "#1d4eeb"), new Point(244, 88, 0.0, 6, "#698bf1"), new Point(194, 32, 0.0, 6, "#fac652"),
new Point(97, 56, 0.0, 6, "#ee5257"), new Point(105, 75, 0.0, 6, "#cf2a3f"), new Point(42, 4, 0.0, 6, "#5681f5"),
new Point(10, 27, 0.0, 6, "#4577f6"), new Point(166, 55, 0.0, 6, "#f7b326"), new Point(266, 88, 0.0, 6, "#2b58e8"),
new Point(178, 34, 0.0, 6, "#facb5e"), new Point(100, 65, 0.0, 6, "#e02e3d"), new Point(343, 32, 0.0, 6, "#f16d6f"),
new Point(59, 5, 0.0, 6, "#507bf2"), new Point(27, 9, 0.0, 6, "#5683f7"), new Point(233, 116, 0.0, 6, "#3158e2"),
new Point(123, 32, 0.0, 6, "#f0696c"), new Point(6, 38, 0.0, 6, "#3769f6"), new Point(63, 62, 0.0, 6, "#6084ef"),
new Point(6, 49, 0.0, 6, "#2a5cf4"), new Point(108, 36, 0.0, 6, "#f4716e"), new Point(169, 43, 0.0, 6, "#f8c247"),
new Point(137, 37, 0.0, 6, "#e74653"), new Point(318, 58, 0.0, 6, "#ec4147"), new Point(226, 100, 0.0, 5, "#4876f1"),
new Point(101, 46, 0.0, 5, "#ef5c5c"), new Point(226, 108, 0.0, 5, "#2552ea"), new Point(17, 17, 0.0, 5, "#4779f7"),
new Point(232, 93, 0.0, 5, "#4b78f1")];
gLength = g.length;
// I commented this so that Google balls appear at the top of the page
//
//for (var i = 0; i < gLength; i++) {
// g[i].curPos.x = (canvasWidth/2 - 180) + g[i].curPos.x;
// g[i].curPos.y = (canvasHeight/2 - 65) + g[i].curPos.y;
// g[i].originalPos.x = (canvasWidth/2 - 180) + g[i].originalPos.x;
// g[i].originalPos.y = (canvasHeight/2 - 65) + g[i].originalPos.y;
//};
pointCollection = new PointCollection();
pointCollection.points = g;
initEventListeners();
timeout();
};
function initEventListeners() {
$(window).bind('resize', updateCanvasDimensions).bind('mousemove', onMove);
canvas.get(0).ontouchmove = function(e) {
e.preventDefault();
onTouchMove(e);
};
canvas.get(0).ontouchstart = function(e) {
e.preventDefault();
};
};
function updateCanvasDimensions() {
canvas.attr({height: $(window).height(), width: $(window).width()});
canvasWidth = canvas.width();
canvasHeight = canvas.height();
draw();
};
function onMove(e) {
if (pointCollection)
pointCollection.mousePos.set(e.pageX, e.pageY);
};
function onTouchMove(e) {
if (pointCollection)
pointCollection.mousePos.set(e.targetTouches[0].pageX, e.targetTouches[0].pageY);
};
function timeout() {
draw();
update();
setTimeout(function() { timeout() }, 30);
};
function draw() {
var tmpCanvas = canvas.get(0);
if (tmpCanvas.getContext == null) {
return;
};
ctx = tmpCanvas.getContext('2d');
ctx.clearRect(0, 0, canvasWidth, canvasHeight);
if (pointCollection)
pointCollection.draw();
};
function update() {
if (pointCollection)
pointCollection.update();
};
function Vector(x, y, z) {
this.x = x;
this.y = y;
this.z = z;
this.addX = function(x) {
this.x += x;
};
this.addY = function(y) {
this.y += y;
};
this.addZ = function(z) {
this.z += z;
};
this.set = function(x, y, z) {
this.x = x;
this.y = y;
this.z = z;
};
};
function PointCollection() {
this.mousePos = new Vector(0, 0);
this.points = new Array();
this.newPoint = function(x, y, z) {
var point = new Point(x, y, z);
this.points.push(point);
return point;
};
this.update = function() {
var pointsLength = this.points.length;
for (var i = 0; i < pointsLength; i++) {
var point = this.points[i];
if (point == null)
continue;
var dx = this.mousePos.x - point.curPos.x;
var dy = this.mousePos.y - point.curPos.y;
var dd = (dx * dx) + (dy * dy);
var d = Math.sqrt(dd);
if (d < 150) {
point.targetPos.x = (this.mousePos.x < point.curPos.x) ? point.curPos.x - dx : point.curPos.x - dx;
point.targetPos.y = (this.mousePos.y < point.curPos.y) ? point.curPos.y - dy : point.curPos.y - dy;
} else {
point.targetPos.x = point.originalPos.x;
point.targetPos.y = point.originalPos.y;
};
point.update();
};
};
this.draw = function() {
var pointsLength = this.points.length;
for (var i = 0; i < pointsLength; i++) {
var point = this.points[i];
if (point == null)
continue;
point.draw();
};
};
};
function Point(x, y, z, size, colour) {
this.colour = colour;
this.curPos = new Vector(x, y, z);
this.friction = 0.8;
this.originalPos = new Vector(x, y, z);
this.radius = size;
this.size = size;
this.springStrength = 0.1;
this.targetPos = new Vector(x, y, z);
this.velocity = new Vector(0.0, 0.0, 0.0);
this.update = function() {
var dx = this.targetPos.x - this.curPos.x;
var ax = dx * this.springStrength;
this.velocity.x += ax;
this.velocity.x *= this.friction;
this.curPos.x += this.velocity.x;
var dy = this.targetPos.y - this.curPos.y;
var ay = dy * this.springStrength;
this.velocity.y += ay;
this.velocity.y *= this.friction;
this.curPos.y += this.velocity.y;
var dox = this.originalPos.x - this.curPos.x;
var doy = this.originalPos.y - this.curPos.y;
var dd = (dox * dox) + (doy * doy);
var d = Math.sqrt(dd);
this.targetPos.z = d/100 + 1;
var dz = this.targetPos.z - this.curPos.z;
var az = dz * this.springStrength;
this.velocity.z += az;
this.velocity.z *= this.friction;
this.curPos.z += this.velocity.z;
this.radius = this.size*this.curPos.z;
if (this.radius < 1) this.radius = 1;
};
this.draw = function() {
ctx.fillStyle = this.colour;
ctx.beginPath();
ctx.arc(this.curPos.x, this.curPos.y, this.radius, 0, Math.PI*2, true);
ctx.fill();
};
};
init();
});
最佳答案
如果没有看到一些工作代码(比如在 jsfiddle 上)，这有点棘手，但我猜你需要 float 菜单和 Logo ( Canvas )元素，确保在菜单元素上调用 clear:left 来强制它更上一层楼。
编辑:您希望 Logo 居中；使用可以使用 margin: 0 auto;
关于javascript - 无法将 Canvas 定位在页面顶部，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11256609/