AnimeJS Progressive Fill of an SVG path - javascript

I have an SVG with different paths, and I want to animate the "fill" of these paths so it looks like it's being "hand drawn".
So far i Feel like I'm pretty close using the "strokeDashoffset" of anime.js, but I don't want the "borders" to be animated, I want the inside
Here's what I have :
JS :
var cssSelector = anime({
targets: '#cssSelector .lines path',
strokeDashoffset: [anime.setDashoffset, 0],
easing: 'easeInOutSine',
duration: 1500,
delay: function(el, i) { return i * 250 },
direction: 'alternate',
loop: false
});
SVG/html
<div id="cssSelector">
<svg
width="100%"
height="auto"
viewBox="0 0 122.84119 21.053778">
<g
transform="translate(-44.718109,-94.290359)">
<g
fill="#FFF" fill-rule="evenodd" stroke="currentColor" stroke-width="0.1" class="lines" stroke-linecap="round"
id="text12">
<path
d="m 44.718109,95.475692 h 1.439333 v 19.755558 h -1.439333 z"
style=""
id="path14" />
<path
d="m 59.899459,114.29991 q -0.536222,0.508 -1.354666,0.79023 -0.790222,0.254 -1.665111,0.254 -1.919111,0 -2.963334,-1.04423 -1.044222,-1.07244 -1.044222,-2.96333 v -9.62378 h -2.709333 v -1.21355 h 2.709333 v -3.217336 h 1.411111 v 3.217336 h 4.684889 v 1.21355 h -4.684889 v 9.48267 q 0,1.43933 0.677334,2.20133 0.705555,0.73378 2.060222,0.73378 1.382889,0 2.286,-0.81844 z"
style=""
id="path16" />
<path
d="m 97.978291,95.475692 -6.688667,19.755558 h -1.524 L 83.641402,97.507692 77.488958,115.23125 h -1.524 L 69.24807,95.475692 h 1.523999 l 6.011334,17.779998 6.180666,-17.779998 h 1.382889 l 6.152444,17.808218 6.067778,-17.808218 z"
style=""
id="path18" />
<path
d="m 106.30297,115.34414 q -2.08845,0 -3.78178,-0.95956 -1.66511,-0.95956 -2.624668,-2.65289 -0.959556,-1.72155 -0.959556,-3.86644 0,-2.14489 0.959556,-3.83822 0.959558,-1.72156 2.624668,-2.68112 1.69333,-0.95955 3.78178,-0.95955 2.08844,0 3.75355,0.95955 1.69333,0.95956 2.65289,2.68112 0.95956,1.69333 0.95956,3.83822 0,2.14489 -0.95956,3.86644 -0.95956,1.69333 -2.65289,2.65289 -1.66511,0.95956 -3.75355,0.95956 z m 0,-1.27 q 1.69333,0 3.01977,-0.79023 1.35467,-0.79022 2.11667,-2.20133 0.79022,-1.41111 0.79022,-3.21733 0,-1.80622 -0.79022,-3.21734 -0.762,-1.41111 -2.11667,-2.20133 -1.32644,-0.79022 -3.01977,-0.79022 -1.69334,0 -3.048,0.79022 -1.32645,0.79022 -2.11667,2.20133 -0.762,1.41112 -0.762,3.21734 0,1.80622 0.762,3.21733 0.79022,1.41111 2.11667,2.20133 1.35466,0.79023 3.048,0.79023 z"
style=""
id="path20" />
<path
d="m 119.37382,103.71658 q 0.67733,-1.60867 2.11667,-2.45533 1.43933,-0.87489 3.49955,-0.87489 v 1.38289 l -0.33866,-0.0282 q -2.45534,0 -3.83823,1.55222 -1.38288,1.524 -1.38288,4.26155 v 7.67645 h -1.41112 v -14.732 h 1.35467 z"
style=""
id="path22" />
<path
d="m 134.12743,107.35725 -3.83822,3.49955 v 4.37445 h -1.41112 V 94.290359 h 1.41112 v 14.816661 l 9.42622,-8.60777 h 1.80622 l -6.35,5.95489 6.97089,8.77711 h -1.74978 z"
style=""
id="path24" />
<path
d="m 148.75404,115.34414 q -1.778,0 -3.38667,-0.53623 -1.60866,-0.53622 -2.51177,-1.35466 l 0.64911,-1.12889 q 0.90311,0.762 2.31422,1.27 1.43933,0.508 2.99155,0.508 2.22956,0 3.27378,-0.73378 1.07245,-0.73378 1.07245,-2.032 0,-0.93133 -0.59267,-1.46756 -0.56444,-0.53622 -1.41111,-0.79022 -0.84667,-0.254 -2.34245,-0.53622 -1.74977,-0.31044 -2.82222,-0.67733 -1.07244,-0.36689 -1.83444,-1.18534 -0.762,-0.81844 -0.762,-2.25777 0,-1.74978 1.43933,-2.87867 1.46756,-1.15711 4.14867,-1.15711 1.41111,0 2.794,0.39511 1.38289,0.39511 2.25778,1.04422 l -0.64912,1.12889 q -0.90311,-0.64911 -2.06022,-0.98778 -1.15711,-0.33866 -2.37066,-0.33866 -2.06023,0 -3.10445,0.762 -1.04422,0.762 -1.04422,2.00377 0,0.98778 0.59267,1.55223 0.59266,0.53622 1.43933,0.81844 0.87489,0.254 2.42711,0.56444 1.72156,0.31045 2.76578,0.67734 1.07244,0.33866 1.80622,1.12889 0.73378,0.79022 0.73378,2.17311 0,1.83444 -1.524,2.93511 -1.524,1.10067 -4.28978,1.10067 z"
style=""
id="path26" />
<path
d="m 165.55552,95.475692 h 1.63689 l -0.28222,14.082888 h -1.07245 z m 0.81845,19.868448 q -0.47978,0 -0.81845,-0.33867 -0.33866,-0.33867 -0.33866,-0.81845 0,-0.47977 0.33866,-0.81844 0.33867,-0.33867 0.81845,-0.33867 0.508,0 0.84666,0.33867 0.33867,0.33867 0.33867,0.81844 0,0.47978 -0.33867,0.81845 -0.33866,0.33867 -0.84666,0.33867 z"
style=""
id="path28" />
</g>
</g>
</svg>
</div>
And here's the result (after the animation)
My first idea was to draw the stroke inside of the element with a big "stroke-width", but appearently there's nothing to do so.
Thanks for your help and sorry for bad english :)


Apparently there is no way to do it with pure CSS. ended up following this tutorial and it worked Great
https://medium.com/#anatacreative/handwriting-animation-with-svg-638931410cfa

Related

Dynamically color svg elements on canvas

I am trying to draw this chess piece to a Canvas element, and I want to give it a custom fill color.
I tried the following to add the svg to DOM and it worked.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
</body>
<script>
window.onload = function(){
const color = "#02B09F"
const svg_string = `<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45"><g style="fill:none; fill-opacity:1; fill-rule:evenodd; stroke:${color}; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;"><path d="M 22.5,11.63 L 22.5,6" style="fill:none; stroke:${color}; stroke-linejoin:miter;" id="path6570"/><path d="M 22.5,25 C 22.5,25 27,17.5 25.5,14.5 C 25.5,14.5 24.5,12 22.5,12 C 20.5,12 19.5,14.5 19.5,14.5 C 18,17.5 22.5,25 22.5,25" style="fill:${color};fill-opacity:1; stroke-linecap:butt; stroke-linejoin:miter;"/><path d="M 12.5,37 C 18,40.5 27,40.5 32.5,37 L 32.5,30 C 32.5,30 41.5,25.5 38.5,19.5 C 34.5,13 25,16 22.5,23.5 L 22.5,27 L 22.5,23.5 C 20,16 10.5,13 6.5,19.5 C 3.5,25.5 12.5,30 12.5,30 L 12.5,37" style="fill:${color}; stroke:${color};"/><path d="M 20,8 L 25,8" style="fill:none; stroke:${color}; stroke-linejoin:miter;"/><path d="M 32,29.5 C 32,29.5 40.5,25.5 38.03,19.85 C 34.15,14 25,18 22.5,24.5 L 22.5,26.6 L 22.5,24.5 C 20,18 10.85,14 6.97,19.85 C 4.5,25.5 13,29.5 13,29.5" style="fill:none; stroke:#ffffff;"/><path d="M 12.5,30 C 18,27 27,27 32.5,30 M 12.5,33.5 C 18,30.5 27,30.5 32.5,33.5 M 12.5,37 C 18,34 27,34 32.5,37" style="fill:none; stroke:#ffffff;"/></g></svg>`
const parser = new DOMParser();
const doc = parser.parseFromString(svg_string, "image/svg+xml");
document.querySelector('body').appendChild(doc.firstChild)
}
</script>
</html>
but using drawImage with doc.firstChild didn't work, it gave me the following error:
CanvasRenderingContext2D.drawImage: Argument 1 could not be converted to any of: HTMLImageElement, SVGImageElement, HTMLCanvasElement, HTMLVideoElement, ImageBitmap.
the code:
const color = "#02B09F"
const svg_string = `<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45"><g style="fill:none; fill-opacity:1; fill-rule:evenodd; stroke:${color}; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;"><path d="M 22.5,11.63 L 22.5,6" style="fill:none; stroke:${color}; stroke-linejoin:miter;" id="path6570"/><path d="M 22.5,25 C 22.5,25 27,17.5 25.5,14.5 C 25.5,14.5 24.5,12 22.5,12 C 20.5,12 19.5,14.5 19.5,14.5 C 18,17.5 22.5,25 22.5,25" style="fill:${color};fill-opacity:1; stroke-linecap:butt; stroke-linejoin:miter;"/><path d="M 12.5,37 C 18,40.5 27,40.5 32.5,37 L 32.5,30 C 32.5,30 41.5,25.5 38.5,19.5 C 34.5,13 25,16 22.5,23.5 L 22.5,27 L 22.5,23.5 C 20,16 10.5,13 6.5,19.5 C 3.5,25.5 12.5,30 12.5,30 L 12.5,37" style="fill:${color}; stroke:${color};"/><path d="M 20,8 L 25,8" style="fill:none; stroke:${color}; stroke-linejoin:miter;"/><path d="M 32,29.5 C 32,29.5 40.5,25.5 38.03,19.85 C 34.15,14 25,18 22.5,24.5 L 22.5,26.6 L 22.5,24.5 C 20,18 10.85,14 6.97,19.85 C 4.5,25.5 13,29.5 13,29.5" style="fill:none; stroke:#ffffff;"/><path d="M 12.5,30 C 18,27 27,27 32.5,30 M 12.5,33.5 C 18,30.5 27,30.5 32.5,33.5 M 12.5,37 C 18,34 27,34 32.5,37" style="fill:none; stroke:#ffffff;"/></g></svg>`
const parser = new DOMParser();
const doc = parser.parseFromString(svg_string, "image/svg+xml");
let canvas = document.querySelector('canvas');
canvas.width = 100;
canvas.height = 100;
let cx = canvas.getContext('2d');
cx.drawImage(doc.firstChild, 0, 0)
any idea how to fix it, or if you know a better way to color SVGs using javascript

just make a function and replace the colors. test code here
function renderChess(white = '#FFFFFF', black = '#000000'){
return '<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="45" height="45"> <g style="fill:none; fill-opacity:1; fill-rule:evenodd; stroke:' + black + '; stroke-width:1.5; stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4; stroke-dasharray:none; stroke-opacity:1;"> <path d="M 22.5,11.63 L 22.5,6" style="fill:none; stroke:' + black + '; stroke-linejoin:miter;" id="path6570"/> <path d="M 22.5,25 C 22.5,25 27,17.5 25.5,14.5 C 25.5,14.5 24.5,12 22.5,12 C 20.5,12 19.5,14.5 19.5,14.5 C 18,17.5 22.5,25 22.5,25" style="fill:' + black + ';fill-opacity:1; stroke-linecap:butt; stroke-linejoin:miter;"/> <path d="M 12.5,37 C 18,40.5 27,40.5 32.5,37 L 32.5,30 C 32.5,30 41.5,25.5 38.5,19.5 C 34.5,13 25,16 22.5,23.5 L 22.5,27 L 22.5,23.5 C 20,16 10.5,13 6.5,19.5 C 3.5,25.5 12.5,30 12.5,30 L 12.5,37" style="fill:' + black + '; stroke:' + black + ';"/> <path d="M 20,8 L 25,8" style="fill:none; stroke:' + black + '; stroke-linejoin:miter;"/> <path d="M 32,29.5 C 32,29.5 40.5,25.5 38.03,19.85 C 34.15,14 25,18 22.5,24.5 L 22.5,26.6 L 22.5,24.5 C 20,18 10.85,14 6.97,19.85 C 4.5,25.5 13,29.5 13,29.5" style="fill:none; stroke:' + white + ';"/> <path d="M 12.5,30 C 18,27 27,27 32.5,30 M 12.5,33.5 C 18,30.5 27,30.5 32.5,33.5 M 12.5,37 C 18,34 27,34 32.5,37" style="fill:none; stroke:' + white + ';"/> </g> </svg>';
}
window.onload = function(){
const color = "#02B09F"
const svg_string = renderChess(color, 'black');
const parser = new DOMParser();
const doc = parser.parseFromString(svg_string, "image/svg+xml");
document.querySelector('body').appendChild(doc.firstChild)
}

Rounded corners in SVG path semi circle

I have a path which is a semi-circle. How do I make the corners rounded? I do not want to use stroke-linecap: round as I need it to be rounded only on these corners:
<svg>
<g>
<!--background -->
<path fill="none" stroke-dasharray="" stroke-width="16" stroke="#607985" d="M30 100 A 40 40 0 0 1 170 100"></path>
<!-- strokes -->
<path id="meter-back" fill="none" stroke-width="15" stroke="white" d="M30 100 A 40 40 0 0 1 170 100"></path>
<!--progress -->
<path id="meter-fill" fill="none" stroke-dashoffset="219.942" stroke-dasharray="109.971, 109.971" stroke="rgba(96,121,133,0.7)" stroke-width="15" d="M30 100 A 40 40 0 0 1 170 100" stroke="#607985"></path>
</g>
</svg>

Here is a fixed solution. dividerPos can be in range from 0 to 1:
const getPath = (outerRadius, innerRadius, cornerRadius, dividerPos) => {
const angle = Math.PI * (1 - dividerPos);
const outerPointX = outerRadius * Math.cos(angle);
const outerPointY = outerRadius * -Math.sin(angle);
const innerPointX = innerRadius * Math.cos(angle);
const innerPointY = innerRadius * -Math.sin(angle);
const left = `M ${-outerRadius},0
A ${outerRadius},${outerRadius} 0 0 1
${outerPointX},${outerPointY}
L ${innerPointX},${innerPointY}
A ${innerRadius},${innerRadius} 0 0 0 ${-innerRadius},0
Q ${-innerRadius},${cornerRadius}
${-innerRadius-cornerRadius},${cornerRadius}
H ${-outerRadius+cornerRadius}
Q ${-outerRadius},${cornerRadius}
${-outerRadius},0
Z`;
const right = `M ${outerPointX},${outerPointY}
A ${outerRadius},${outerRadius} 0 0 1
${outerRadius},0
Q ${outerRadius},${cornerRadius}
${outerRadius-cornerRadius},${cornerRadius}
H ${innerRadius+cornerRadius}
Q ${innerRadius},${cornerRadius}
${innerRadius},0
A ${innerRadius},${innerRadius} 0 0 0
${innerPointX},${innerPointY}
Z`;
return {left, right};
};
const {left, right} = getPath(120, 90, 15, 0.5);
d3.select('.left').attr('d', left);
d3.select('.right').attr('d', right);
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<svg width='300' height='200'>
<g transform='translate(150,150)'>
<path stroke='grey' fill='grey' class='left'/>
<path stroke='grey' fill='none' class='right'/>
</g>
</svg>

Use getPath routine to compute the desired path
(The 0,0 point in the center of the semi-circle):
const getPath = (outerRadius, innerRadius, cornerRadius) => {
return `M ${-outerRadius},0
A ${outerRadius},${outerRadius} 1 1 1 ${outerRadius},0
Q ${outerRadius},${cornerRadius}
${outerRadius-cornerRadius},${cornerRadius}
H ${innerRadius+cornerRadius}
Q ${innerRadius},${cornerRadius}
${innerRadius},0
A ${innerRadius},${innerRadius} 0 0 0
${-innerRadius},0
Q ${-innerRadius},${cornerRadius}
${-innerRadius-cornerRadius},${cornerRadius}
H ${-outerRadius+cornerRadius}
Q ${-outerRadius},${cornerRadius}
${-outerRadius},0
Z`;
};
d3.select('path').attr('d', getPath(120, 90, 12));
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.7.0/d3.min.js"></script>
<svg width='300' height='200'>
<g transform='translate(150,150)'>
<path stroke='red' fill='none'/>
<circle fill='red' r='5' cx='0' cy='0'/>
</g>
</svg>

How to render n slices inside svg circle?

I am developing a reactJS app.
I need to render an svg circle and when I click it it spawns n equal slices inside.
I created the slices, here is the code
renderSlices = () => {
let slices = [];
const numberOfSlice = 12; //number of slices
for (let i = 0; i < numberOfSlice; i++) {
slices.push({ percent: 1 / numberOfSlice, color: 'gray' });
}
let cumulativePercent = 0;
let arr = [];
arr = slices.map(slice => {
const [startX, startY] = this.getCoordinatesForPercent(cumulativePercent.toString());
cumulativePercent += slice.percent;
const [endX, endY] = this.getCoordinatesForPercent(cumulativePercent.toString());
const largeArcFlag = slice.percent > 0.5 ? 1 : 0;
const pathData = [
`M ${startX} ${startY}`, // Move
`A 1 1 0 ${largeArcFlag} 1 ${endX} ${endY}`, // Arc
'L 0 0', // Line
].join(' ');
return <path d={pathData} fill={slice.color} key={pathData} />;
});
return arr;
}
getCoordinatesForPercent(percent: string) {
const x = Math.cos(2 * Math.PI * parseFloat(percent));
const y = Math.sin(2 * Math.PI * parseFloat(percent));
return [x, y];
}
Render method:
<div className="container">
<svg
height="306"
width="306"
viewBox="-1 -1 2 2"
>
{/* <circle cx="150" cy="150" r="148" stroke="black"
strokeWidth="2" fill={"transparent"}/> */}
{this.renderSlices()}
</svg>
</div>
The problem is when I remove the comment from the circle tag and I remove the viewBox, only the circle show up, and when I comment the circle tag and put the viewBox, only the slices show up.
I would like to have the circle with a visible stroke and inside it the slices.
Any help please ?
EDIT:
<svg height="306" width="306" viewBox="0 0 306 306">
<path d="M 1 0 A 1 1 0 0 1 0.8660254037844387 0.49999999999999994 L 0 0" stroke-width="2" stroke="black" fill="gray"></path>
<path d="M 0.8660254037844387 0.49999999999999994 A 1 1 0 0 1 0.5000000000000001 0.8660254037844386 L 0 0" stroke-width="2" stroke="black" fill="gray"></path>
<path d="M 0.5000000000000001 0.8660254037844386 A 1 1 0 0 1 6.123233995736766e-17 1 L 0 0" stroke-width="2" stroke="black" fill="gray"></path>
<path d="M 6.123233995736766e-17 1 A 1 1 0 0 1 -0.4999999999999998 0.8660254037844387 L 0 0" stroke-width="2" stroke="black" fill="gray"></path>
<path d="M -0.4999999999999998 0.8660254037844387 A 1 1 0 0 1 -0.8660254037844385 0.5000000000000003 L 0 0" stroke-width="2" stroke="black" fill="gray"></path>
<path d="M -0.8660254037844385 0.5000000000000003 A 1 1 0 0 1 -1 5.66553889764798e-16 L 0 0" stroke-width="2" stroke="black" fill="gray"></path>
<path d="M -1 5.66553889764798e-16 A 1 1 0 0 1 -0.866025403784439 -0.4999999999999994 L 0 0" stroke-width="2" stroke="black" fill="gray"></path>
<path d="M -0.866025403784439 -0.4999999999999994 A 1 1 0 0 1 -0.5000000000000004 -0.8660254037844385 L 0 0" stroke-width="2" stroke="black" fill="gray"></path>
<path d="M -0.5000000000000004 -0.8660254037844385 A 1 1 0 0 1 -1.8369701987210297e-16 -1 L 0 0" stroke-width="2" stroke="black" fill="gray"></path>
<path d="M -1.8369701987210297e-16 -1 A 1 1 0 0 1 0.5000000000000001 -0.8660254037844386 L 0 0" stroke-width="2" stroke="black" fill="gray"></path>
<path d="M 0.5000000000000001 -0.8660254037844386 A 1 1 0 0 1 0.8660254037844388 -0.49999999999999967 L 0 0" stroke-width="2" stroke="black" fill="gray"></path>
<path d="M 0.8660254037844388 -0.49999999999999967 A 1 1 0 0 1 1 -2.4492935982947064e-16 L 0 0" stroke-width="2" stroke="black" fill="gray"></path>
</svg>

getCoordinatesForPercent(percent: string, radius: number, circle: {x: number, y: number}) {
const x = radius * Math.cos(2 * Math.PI * parseFloat(percent)) + circle.x;
const y = radius * Math.sin(2 * Math.PI * parseFloat(percent)) + circle.y;
return [x, y];
}
Multiply with radius and add the circle coordinates
and change A 1 1 0 ${largeArcFlag} to A ${radius} ${radius} 0 ${largeArcFlag} and 'L 0 0' to 'L ${circle.x} ${circle.y}'

Can you use GSAP in a wix HTML iframe element?

I have got aa animation working using HTML and javascript with GSAP, however when i implement this code as HTML content in wix for my website it fails to work?
Is it possible to use GSAP within the wix environment and if so how do I import the GSAP module?
Thanks in advance for any help!
Edit: This is the code i have trued within the HTML element:
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Page Title</title>
<link rel="stylesheet" href="./style_test.css" />
</head>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.6.0/gsap.min.js"defer></script>
<script type="text/js" defer>
let tween = gsap.from('.r', { duration: 3, y: '10%', x:'300%' })
tween.repeat(0);
</script>
<div class="container" style=
"width:100%; height: auto;
border:10px dashed black;">
<svg
id="svg5344"
version="1.1"
id="svg"
width="100%" height="auto"
viewBox="58 0 180 200"
>
<path
style="fill:none;stroke:#808080;stroke-width:0.02401723px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
d="M 85.427742,87.94295 Z"
id="path7543" />
<g
stroke="#f1dd38" stroke-width="0.3" fill="#f1dd38" fill-rule="nonzero"
class="axpro">
<path
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Why <marker> doesn't orientate as the <path>

I'm trying to create a curved arrow with svg. I'm using d3.line() to generate the path.
let points = [
[400,100],
[450,200],
[350,200],
[385,275]
]
let path = d3.line().curve(d3.curveCardinal)(points)
console.log(path)
// -> M400,100C400,100,458.3333333333333,183.33333333333334,450,200C441.6666666666667,216.66666666666666,360.8333333333333,187.5,350,200C339.1666666666667,212.5,385,275,385,275
But when I try to use this result in a svg:
<svg width="1200" height="1200" viewBox="0 0 1200 1200" xmlns="http://www.w3.org/2000/svg" version="1.1">
<defs>
<marker id="Triangle" viewBox="0 0 10 10" refX="1" refY="5" markerWidth="6" markerHeight="6" orient="auto">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
<path d="M400,100C400,100,458.3333333333333,183.33333333333334,450,200C441.6666666666667,216.66666666666666,360.8333333333333,187.5,350,200C339.1666666666667,212.5,385,275,385,275"
stroke-width="2" stroke="lightblue" fill="none" style="marker-end: url(#Triangle);"></path>
</svg>
And here is the SVG result
.
I can't figure out why the marker doesn't orientate. Is there a better library to generate path to resolve this?

That's the expected behaviour. The issue is that in a cardinal spline...
Two additional points are required on either end of the curve.
And those points seem to interfere with the marker orientation (which is indeed the case, see LeBeau's answer).
You can easily see this if you change the curve. For instance, using curveBasis:
let points = [
[400,100],
[450,200],
[350,200],
[385,275]
]
let path = d3.line().curve(d3.curveBasis)(points)
d3.select("#myPath").attr("d", path);
<script src="https://d3js.org/d3.v5.min.js"></script>
<svg width="1200" height="1200" viewBox="0 0 1200 1200" xmlns="http://www.w3.org/2000/svg" version="1.1">
<defs>
<marker id="Triangle" viewBox="0 0 10 10" refX="1" refY="5" markerWidth="6" markerHeight="6" orient="auto">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
<path id="myPath" stroke-width="2" stroke="lightblue" fill="none" style="marker-end: url(#Triangle);"></path>
</svg>
In your case, a solution (arguably a hack) may be adding a final line to the path, just 1px away from the final point:
path = path + "L387,277";
Here is the demo:
let points = [
[400,100],
[450,200],
[350,200],
[385,275]
]
let path = d3.line().curve(d3.curveCardinal)(points)
path = path + "L387,277";
d3.select("#myPath").attr("d", path);
<script src="https://d3js.org/d3.v5.min.js"></script>
<svg width="1200" height="1200" viewBox="0 0 1200 1200" xmlns="http://www.w3.org/2000/svg" version="1.1">
<defs>
<marker id="Triangle" viewBox="0 0 10 10" refX="1" refY="5" markerWidth="6" markerHeight="6" orient="auto">
<path d="M 0 0 L 10 5 L 0 10 z" />
</marker>
</defs>
<path id="myPath" stroke-width="2" stroke="lightblue" fill="none" style="marker-end: url(#Triangle);"></path>
</svg>

This is because the last control point and the end-point of your path have the same coordinates: (385,275).
SVG uses the control point vector to work out what the curve direction is at that point. If your control point vector is from (385,275) to (385,275), then it can't determine the angle. So it defaults to an angle of 0 degrees.

First, the ref attributes are sort of correct but can be better I think, make the refX 0 since you using the full viewBox.
I think the marker's orientation is correct and updated. But based on the ending of the path, the interpolation of the orientation might look incorrect. So you can verify this behavior by cutting your pathstring from the last C... curve and will see that the orientation is correct.
I further tested it to see if it is correct, at least for line segments, here is a fiddle and i didn't even use d3:
https://jsfiddle.net/ibowankenobi/L8x19rco/2/
var path = document.querySelector("path[stroke]");
var arr = Array.apply(null,Array(path.getTotalLength()/4 << 0)).map(function(d,i){
var p = this.getPointAtLength(i*4);
return [p.x,p.y];
},path);
var length = arr.length;
animate();
function animate(index){
if(index >= length){
return;
}
var index = index || 0;
path.setAttribute("d","M"+arr.slice(1,Math.min(++index+1,length)).join("L"));
window.requestAnimationFrame(function(){animate(index);});
}

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