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用CSS在div背景中畫對(duì)角線

我有一個(gè)預(yù)覽框的div:

.preview-content {
  background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAYAAACp8Z5+AAAAGklEQVQIW2NkYGD4D8SMQAwGcAY2AbBKDBUAVuYCBQPd34sAAAAASUVORK5CYII=) repeat;
  width: 100%;
  min-height: 300px;
  max-height: 300px;
  line-height: 300px;
  text-align: center;
  vertical-align: middle;
  font-size: 2em;
}

<div class="preview-content">PREVIEW</div>

自動(dòng)縮放到元素尺寸的解決方案是使用CSS3線性漸變和calc()連接，如下所示。(這個(gè)回答最初描述了Chrome在v30+版本時(shí)的一些問題，但看起來這些問題已經(jīng)得到了解決，在v90+版本中，它像預(yù)期的那樣工作)。

.crossed {
     background: 
         linear-gradient(to top left,
             rgba(0,0,0,0) 0%,
             rgba(0,0,0,0) calc(50% - 0.8px),
             rgba(0,0,0,1) 50%,
             rgba(0,0,0,0) calc(50% + 0.8px),
             rgba(0,0,0,0) 100%),
         linear-gradient(to top right,
             rgba(0,0,0,0) 0%,
             rgba(0,0,0,0) calc(50% - 0.8px),
             rgba(0,0,0,1) 50%,
             rgba(0,0,0,0) calc(50% + 0.8px),
             rgba(0,0,0,0) 100%);
}

<textarea class="crossed"></textarea>

你可以這樣做:

.background {
  background-color: #BCBCBC;
  width: 100px;
  height: 50px;
  padding: 0;
  margin: 0
}

.line1 {
  width: 112px;
  height: 47px;
  border-bottom: 1px solid red;
  -webkit-transform: translateY(-20px) translateX(5px) rotate(27deg);
  position: absolute;
  /* top: -20px; */
}

.line2 {
  width: 112px;
  height: 47px;
  border-bottom: 1px solid green;
  -webkit-transform: translateY(20px) translateX(5px) rotate(-26deg);
  position: absolute;
  top: -33px;
  left: -13px;
}

<div class="background">
  <div class="line1"></div>
  <div class="line2"></div>
</div>

你可以用SVG來畫線。

.diag {
    background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' preserveAspectRatio='none' viewBox='0 0 100 100'><path d='M1 0 L0 1 L99 100 L100 99' fill='black' /><path d='M0 99 L99 0 L100 1 L1 100' fill='black' /></svg>");
    background-repeat:no-repeat;
    background-position:center center;
    background-size: 100% 100%, auto;
}

<div class="diag" style="width: 300px; height: 100px;"></div>

這個(gè)3年前的問題的所有其他答案都需要CSS3(或SVG)。然而，除了蹩腳的舊CSS2之外，也可以什么都不用做:

.crossed {
    position: relative;
    width: 300px;
    height: 300px;
}

.crossed:before {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 1px;
    bottom: 1px;
    border-width: 149px;
    border-style: solid;
    border-color: black white;
}

.crossed:after {
    content: '';
    position: absolute;
    left: 1px;
    right: 1px;
    top: 0;
    bottom: 0;
    border-width: 149px;
    border-style: solid;
    border-color: white transparent;
}

<div class='crossed'></div>

intrepidis在這一頁上的回答使用CSS中的背景SVG的優(yōu)點(diǎn)是可以很好地縮放到任何大小或縱橫比，盡管SVG使用& lt路徑& gt它的填充比例不太好。

我剛剛更新了SVG代碼以使用& ltline & gt而不是& lt路徑& gt并添加了非縮放筆畫矢量效果，以防止筆畫隨容器縮放:

<svg xmlns='http://www.w3.org/2000/svg' version='1.1' preserveAspectRatio='none' viewBox='0 0 100 100'>
  <line x1='0' y1='0' x2='100' y2='100' stroke='black' vector-effect='non-scaling-stroke'/>
  <line x1='0' y1='100' x2='100' y2='0' stroke='black' vector-effect='non-scaling-stroke'/>
</svg>

下面是從原始答案(HTML可調(diào)整大小)放入CSS的內(nèi)容:

.diag {
  background: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' version='1.1' preserveAspectRatio='none' viewBox='0 0 100 100'><line x1='0' y1='0' x2='100' y2='100' stroke='black' vector-effect='non-scaling-stroke'/><line x1='0' y1='100' x2='100' y2='0' stroke='black' vector-effect='non-scaling-stroke'/></svg>");
  background-repeat: no-repeat;
  background-position: center center;
  background-size: 100% 100%, auto;
}

<div class="diag" style="width: 200px; height: 150px; border: 1px solid; resize: both; overflow: auto"></div>

請(qǐng)檢查以下內(nèi)容。

<canvas id="myCanvas" width="200" height="100"></canvas>
<div id="mydiv"></div>

JS:

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.strokeStyle="red";
ctx.moveTo(0,100);
ctx.lineTo(200,0);
ctx.stroke();
ctx.moveTo(0,0);
ctx.lineTo(200,100);
ctx.stroke();

CSS:

html, body { 
  margin: 0;
  padding: 0;
}

#myCanvas {
  padding: 0;
  margin: 0;
  width: 200px;
  height: 100px;
}

#mydiv {
  position: absolute;
  left: 0px;
  right: 0;
  height: 102px;
  width: 202px;
  background: rgba(255,255,255,0);
  padding: 0;
  margin: 0;
}

jsfiddle

enter image description here

.crossed {
    width: 200px;
    height: 200px;
    border:solid 1px;
    background-color: rgb(210, 137, 226);
    background-image: repeating-linear-gradient(
      45deg,
      transparent,
      transparent 15px,
      #ccc 10px,
      #ccc 20px
        ),
      repeating-linear-gradient(
        135deg,
        transparent,
        transparent 15px,
        #ccc 10px,
        #ccc 20px
      );
}

<div class='crossed'>Hello world</div>

適用于任何屏幕的svg動(dòng)態(tài)解決方案如下:

<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" stroke-width="1" stroke="#000">
  <line x1="0" y1="0" x2="100%" y2="100%"/>
  <line x1="100%" y1="0" x2="0" y2="100%"/>
</svg>

如果你想把它放在背景中，使用position: absolute，頂部和左側(cè)為0。

您可以使用CSS3轉(zhuǎn)換屬性:

div
{
transform:rotate(Xdeg);
-ms-transform:rotate(Xdeg); /* IE 9 */
-webkit-transform:rotate(Xdeg); /* Safari and Chrome */
}

Xdeg =您的價(jià)值

例如...

您可以創(chuàng)建更多div并使用z-index屬性。所以，用線做一個(gè)div，然后旋轉(zhuǎn)它。

如果你想讓十字部分透明，最簡(jiǎn)單的方法就是讓線性漸變顏色半透明。但是，由于相交離子處的阿爾法混合，產(chǎn)生了不同顏色的鉆石，所以效果并不好。對(duì)此的解決方案是保留純色，但改為在漸變?nèi)萜髦刑砑油该鞫?

.cross {
  position: relative;
}
.cross::after {
  pointer-events: none;
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 0; right: 0;
}

.cross1::after {
  background:
    linear-gradient(to top left, transparent 45%, rgba(255,0,0,0.35) 46%, rgba(255,0,0,0.35) 54%, transparent 55%),
    linear-gradient(to top right, transparent 45%, rgba(255,0,0,0.35) 46%, rgba(255,0,0,0.35) 54%, transparent 55%);
}

.cross2::after {
  background:
    linear-gradient(to top left, transparent 45%, rgb(255,0,0) 46%, rgb(255,0,0) 54%, transparent 55%),
    linear-gradient(to top right, transparent 45%, rgb(255,0,0) 46%, rgb(255,0,0) 54%, transparent 55%);
  opacity: 0.35;
}

div { width: 180px; text-align: justify; display: inline-block; margin: 20px; }

<div class="cross cross1">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam et dui imperdiet, dapibus augue quis, molestie libero. Cras nisi leo, sollicitudin nec eros vel, finibus laoreet nulla. Ut sit amet leo dui. Praesent rutrum rhoncus mauris ac ornare. Donec in accumsan turpis, pharetra eleifend lorem. Ut vitae aliquet mi, id cursus purus.</div>

<div class="cross cross2">Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nullam et dui imperdiet, dapibus augue quis, molestie libero. Cras nisi leo, sollicitudin nec eros vel, finibus laoreet nulla. Ut sit amet leo dui. Praesent rutrum rhoncus mauris ac ornare. Donec in accumsan turpis, pharetra eleifend lorem. Ut vitae aliquet mi, id cursus purus.</div>

下面是我如何使用css clip-path屬性以及相對(duì)和絕對(duì)定位來創(chuàng)建一個(gè)更漂亮的十字。

.cross {
  width:150px;
  height: 150px;
  border: 2px solid #555;
  border-radius: 5px;
  position: relative;
  background: #efefef;
}

.cross .diag1{
  position: absolute;
  width:100%; height:100%;
  clip-path: polygon(90% 0, 100% 0%, 10% 100%, 0% 100%);
  background: #311B92;
}

.cross .diag2{
  position: absolute;
  width:100%; height:100%;
  clip-path: polygon(0 0, 10% 0, 100% 100%, 90% 100%);
  background: #1B5E20;
}

<div class="cross">
  <div class="diag1"></div>
  <div class="diag2"></div>
</div>

我需要在任何div中畫任意的對(duì)角線。我對(duì)張貼的其他答案的問題是，他們沒有一個(gè)允許從點(diǎn)A到點(diǎn)B畫一條任意的線，而不自己做三角法來計(jì)算角度。用javascript & amp你可以做到這一點(diǎn)。希望對(duì)你有幫助，只要指定一對(duì)點(diǎn)，你就成功了。

const objToStyleString = (obj) => {
  const reducer = (acc, curr) => acc += curr + ": " + obj[curr] + ";"; 
  return Object.keys(obj).reduce(reducer, "")
};

const lineStyle = (xy1, xy2, borderStyle) => {
  const p1 = {x: xy1[0], y: xy1[1]};
  const p2 = {x: xy2[0], y: xy2[1]};
  
  const a = p2.x - p1.x;
  const xOffset = p1.x;
  const b = p2.y - p1.y;
  const yOffset = p1.y;
  
  const c = Math.sqrt(a*a + b*b);
  
  const ang = Math.acos(a/c);
  
  const tX1 = `translateX(${-c/2 + xOffset}px) `;
  const tY1 = `translateY(${yOffset}px) `;
  const rot = `rotate(${ang}rad) `;
  const tX2 = `translateX(${c/2}px) `;
  const tY2 = `translateY(${0}px) `;
  
  return {
    "width": Math.floor(c) + "px",
    "height": "0px",
    "border-top": borderStyle,
    "-webkit-transform": tX1+tY1+rot+tX2+tY2,
    "position": "relative",
    "top": "0px",
    "left": "0px",
    "box-sizing": "border-box",
  };
};

function drawLine(parent, p1, p2, borderStyle) {
  const style = lineStyle(p1, p2, borderStyle);
  const line = document.createElement("div");
  line.style = objToStyleString(style);
  parent.appendChild(line);
}

drawLine(container, [100,5], [25,195], "1px dashed purple");
drawLine(container, [100,100], [190,190], "1px solid blue");
drawLine(container, [25,150], [175,150], "2px solid red");
drawLine(container, [25,10], [175,20], "5px dotted green");

#container {
  background-color: #BCBCBC;
  width: 200px;
  height: 200px;
  padding: 0; 
  margin: 0;
}

<div id="container">
</div>

.borders {
    width: 200px;
    height: 100px;
    background-color: black;
    border-width: 40px;
    border-style: solid;
    border-color: red blue green yellow;
}

<div class='borders'></div>

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