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I'm trying to get the orange marker to follow the course of this RC car race track using an SVG element and the AnimeJS library.

enter image description here

But no matter what I try, I get really strange and undesirable results.

Sometimes I can see the marker following the path but the path it's on is offset from the course and not in the same scale, and some things I try I cannot see the marker at all but I can see the scrollbars on my page altering, which indicates that the marker is there and is moving.

I can also look at the browser's inspect tool and can see that the element's styles are changing rapidly - translateX, translateY and rotate.

The code, as I've left it here, shows the marker is moving. If you look carefully in the JSFiddle demo, and wait 9.49seconds for each lap to complete, you can see a flash of an orange ball for a nano-second but the ball isn't to scale and I have no idea what path it's following.

What am I doing wrong? How can this be achieved? I'm open to using other libraries or tools if it helps.

JSFiddle

HTML

<section id="race-event-overview">
    [...]
    <div class="race-track-map">
        <svg class="race-track" viewBox="0 0 560 350" xmlns="http://www.w3.org/2000/svg" fill-rule="evenodd" clip-rule="evenodd"
            stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="1.5">
            <path class="track"
                d="M648.018 1019s-26.755-194 194-194H2618.98c220.76 0 194 194 194 194v527h-.24s10.84 139-112.49 139-112.49-139-112.49-139h-.24v-286s11.83-148-109.52-148H1413s-81-1.45-81 111c0 0-11.07 108 127 108h807s102-6.22 102 107-116 108-116 108h-247s-204.73 67.41-226.18 61.85c-86.34-22.36-182.03-60.17-220.82-61.85h-347s-103 6.77-103-100v-115s5.06-108-118-108c-123.058 0-113 108-113 108v134s10.542 109-121 109-109-118-109-118v-437"
                fill="none" stroke="#2f3b42" stroke-width="88.44"
                transform="matrix(-.20047 .08679 -.08673 -.2006 718.369 267.998)" />
            <circle class="ball" cx="2903.86" cy="664.618" r="31.382" fill="#ff5000" transform="matrix(-.16499 .12905 -.12897 -.1651 775.915 26.115)" />
            <path
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                fill="#707070" fill-rule="nonzero" />
            <path d="M3181 719l29-13" fill="none" stroke="#fff" stroke-width="8.02"
                transform="matrix(.4417 0 0 .44199 -911.014 -195.384)" />
            </svg>
    </div>
</section>

SCSS:

#race-event-overview {
    position: relative;
    height: 500px;
    background: #242D33;

    .race-track-map {
        position: absolute;
        top: 75px;
        right: 0;

        svg {
            height: 350px;
            width: 560px;
        }
    }
}

JS:

var path = anime.path('.race-track .track');

anime({
    targets: '.race-track .ball',
    translateX: path('x'),
    translateY: path('y'),
    rotate: path('angle'),
    easing: 'linear',
    duration: 9490, // fastest lap on course
    loop: true
});
Martin James
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1 Answers1

0

I guess I am too late to be useful for you but:

tl;dr

The whole problem is that transform origin is kind of broken in SVGs and anime.js is a simple tool. To fix this you have to place the animating object (the circle) to cx="0" cy="0" and remove any transforms on the path.

More info

Really helpful article on SVG transform is here on CSS Tricks. The important think from there is: transform of all elements inside svg element has transform origin in upper left corner of the svg element.

If you inspect the transforms that anime.js creates on the animated element you will see exactly the values from the path's d attribute. Those values are number of pixels from origin (again upper left corner of the svg element) however when there is transform applied to the element it will not match. Try Removing transforms in SVG files

WerWet
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  • 14