我正在尝试创建一个动画,其中每个元素都会根据父 div 的背景更改其颜色。我正在使用pts.js制作动画。它在画布上绘制所有内容。
这是我的设置:fiddle。
添加mix-blend-mode: difference;
到画布后,尽管画布 (#pt) 的背景设置为透明,但整个渐变背景都会消失。我希望动画线条像静态文本一样动态改变它们的颜色。我怎样才能实现它?纯CSS甚至可以吗?
您可以将渐变放在画布顶部(使用::before
伪元素),然后mix-blend-mode
将起作用:
$(document).ready(() => {
Pts.namespace(window);
const run = Pts.quickStart("#pt", "transparent");
let pts = new Group();
space.add({
start: () => {
pts = Create.distributeRandom(space.bound, 50);
},
animate: (time, ftime) => {
const perpend = new Group(
new Pt(0, 0),
new Pt(0, window.innerWidth)
).op(Line.perpendicularFromPt);
pts.rotate2D(0.0055, space.center);
pts.forEach((p, i) => {
const lp = perpend(p);
form.stroke(`rgba(255,255,255,255`, 1.01).line([p, lp]);
form.fillOnly(`#000000`).point(p, 1);
});
},
});
space.bindMouse().bindTouch().play();
});
html {
-moz-osx-font-smoothing: grayscale;
-webkit-font-smoothing: antialiased;
text-rendering: optimizeLegibility;
text-size-adjust: 100%;
}
#staticBg {
height: 100vh;
width: 100vw;
top: 0;
left: 0;
position: fixed;
}
#staticBg::before {
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
background: linear-gradient(90deg, rgba(0, 0, 0, 1) 20%, rgba(255, 255, 255, 1) 60%);
content: '';
mix-blend-mode: difference;
z-index: 1;
}
#pt {
height: 100vh;
width: 100vw;
top: 0;
left: 0;
position: fixed;
}
.text {
color: white;
font-size: 50px;
text-align: center;
width: 100vw;
mix-blend-mode: difference;
z-index: 1;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/pts/0.8.8/pts.min.js"></script>
<div id="staticBg">
<canvas id="pt"></canvas>
<div class="text">TEST STRING</div>
</div>