生成随机元素位置并防止 JavaScript 中的重叠
我在页面上有一个持有人 div,我想在其中随机位置加载小图像作为拼贴画,每个图像都有 10 像素的填充。
如何确保图像永远不会相互重叠或保持 div 重叠? 有我可以使用的插件或功能吗?
到目前为止我的代码:
<script src="jquery-1.3.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#my_canvas img").each(
function(intIndex) {
var l = Math.floor(Math.random() * $("#my_canvas").width());
var t = Math.floor(Math.random() * $("#my_canvas").height());
$(this).css("left", l);
$(this).css("top", t);
$(this).bind(
"click",
function() {
alert("l=" + l + " t=" + t);
}
);
}
);
});
<style type="text/css">
#my_canvas
{
background: #eee;
border: black 1px solid;
width: 800px;
height: 400px;
}
#my_canvas img
{
padding: 10px;
position:absolute;
}
</style>
<div id="my_canvas">
<img src="images/1.jpg" />
<img src="images/9.jpg" />
<img src="images/2.jpg" />
<img src="images/3.jpg" />
<img src="images/4.jpg" />
<img src="images/5.jpg" />
<img src="images/6.jpg" />
<img src="images/7.jpg" />
<img src="images/8.jpg" />
</div>
I have a holder div on the page where I want to load small images in on random position as a collage with 10px padding on each.
How can I make sure that images never overlap each other or holder div?
Is there a plugin or function that I could use?
My code so far:
<script src="jquery-1.3.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function(){
$("#my_canvas img").each(
function(intIndex) {
var l = Math.floor(Math.random() * $("#my_canvas").width());
var t = Math.floor(Math.random() * $("#my_canvas").height());
$(this).css("left", l);
$(this).css("top", t);
$(this).bind(
"click",
function() {
alert("l=" + l + " t=" + t);
}
);
}
);
});
<style type="text/css">
#my_canvas
{
background: #eee;
border: black 1px solid;
width: 800px;
height: 400px;
}
#my_canvas img
{
padding: 10px;
position:absolute;
}
</style>
<div id="my_canvas">
<img src="images/1.jpg" />
<img src="images/9.jpg" />
<img src="images/2.jpg" />
<img src="images/3.jpg" />
<img src="images/4.jpg" />
<img src="images/5.jpg" />
<img src="images/6.jpg" />
<img src="images/7.jpg" />
<img src="images/8.jpg" />
</div>
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将选取的坐标存储在数组中,以便您可以将放置的每个新图像的坐标与前一个图像的坐标进行比较。
如果您选取的坐标与之前的图像重叠,请选取新坐标。限制尝试次数,这样如果尝试 1000 次仍无法放置图像,则可以从第一个图像开始。
Store the picked coordinates in an array, so that you can compare the coordinates of each new image you place against the previous.
If the coordinates that you picked overlaps a previous image, pick new coordinates. Limit the number of tries so that if you can't place an image with say 1000 tries, you start over with the first image.
抱歉挖出一篇旧帖子,但我最近遇到了类似的问题,我花了一些时间才找到完美的解决方案 - 我现在想分享。有多种方法可以实现这一目标。
1) 困难的方法
如果您想自己实现它,您可能会获得最适合您需求的结果。它确实需要一些时间和大量的测试,但实际上您自己实现这样的功能并不困难。您可以使用随机函数
Math.floor(Math.random() * Max) + Min
计算父元素中的随机位置。定位第一个元素后,您需要将元素的坐标存储在数组中。现在,在显示下一个元素之前,您可以使用数组检查是否存在重叠 - 如果是,您可以计算一个新位置。这可能不是最有效的方法,但对于数量不多的元素来说它会很好地工作。但我非常确定,如果您实现了这一点,那么优化您的算法以使其更加高效也不会太困难。2) 解决方法
实现此目的的第二种方法比第一种方法更容易,但也没有第一种方法灵活。因此,您需要使用一些预定义的布局 - 某种网格。因此,假设您有一个包含 100 个网格块的容器,即 100 个元素来放入您的元素。您现在可以计算 1 到 100 之间的随机数,并将您的元素附加到网格容器中。防止重叠很容易,但这种方法可能并不总是适合您的需求。
3)最简单的方法
如果搜索了很长一段时间,但没有一个插件符合我的需求。所以我自己创建了一个,我发布了并且可以免费使用。您可以在 manuelmaurer.at/randposplugin.php 下找到它。它非常灵活,所以我认为这将是您实现目标的最简单方法。
Sorry for digging out an old post, but I recently came across a similar problem and it took me some time to find the perfect solution - that I now wanted to share. There are tree ways to achieve this.
1) The hard way
If you'd like to implement it on your own, you will probably achieve the result best fitting your needs. It does require some time and lots of testing but actually it's not that difficult to implement such a feature on your own. You can use the Random-Functions
Math.floor(Math.random() * Max) + Min
to calculate a random position in the parent element. After positioning the first element, you need to store the coordinates of the element, in an array for instance. Now before you show the next element you can use the array to check if there are overlaps - if so, you can just calculate a new position. Isn't the most efficient way to do this probably but it'll work quite well for not so big amounts of elements. But I'm pretty sure that if you implemented this, it's also not too difficult to optimize your algorithm in order to make this more efficient.2) The workaround way
The second way to achieve this is ways easier then the first way but also not as flexible. Therefore you'd need to use some predefined layout - some kind of a grid. So lets assume that you have a container with 100 grid-blocks, so 100 elements to put your elements in. You could now just calculate a random number between 1 and 100 and append your element to the grid-container. It's quite easy to prevent overlapping but this way of doing it might not always fit your needs.
3) The easiest way
If searched quite a while but there was not a single plugin which fit my needs. So I created one on my own, which I published and which can be used for free. You can find it under manuelmaurer.at/randposplugin.php. It's pretty flexible so I think this one would be the easiest way for you to achieve your goals.
估计没有插件吧我将像 Sander 建议的那样通过制作预定义的 div 网格并仅将随机图像加载到这些 div 来实现此目的。它比计算图像尺寸/位置更容易、更快,并且完成几乎相同的工作。不是随机的,但视觉上看起来不错:)
I guess there is no plugin. I will implement this like Sander suggested by making predefined div grid and just loading random images to those divs. It's easier and faster than calculating image dimenssions/positions and does pretty much the same job. Not random but visually looks good :)