Created
November 8, 2018 10:41
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Get coordinates along an SVG path
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<div class="container"> | |
<div id="obj"></div> | |
<svg version="1.1" x="0px" y="0px" width="440.5px" height="147.2px" viewBox="0 0 440.5 147.2" enable-background="new 0 0 440.5 147.2" | |
xml:space="preserve"> | |
<path id="path" fill="none" stroke="#000000" stroke-width="2.8243" stroke-miterlimit="10" d="M1.3,78c0,0,74-172.3,198,0s240-38.3,240-38.3" | |
/> | |
</svg> | |
<br><br> | |
<input type="range" name="slider" id="slider" min="0" max="100" width="500"> | |
<input type="text" name="slider_val" size="3" id="slider_val"> | |
<br><br> | |
<button id="toggle_animation_btn">Toggle Animation</button> | |
</div> |
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// The two important methods here are | |
// path.getTotalLength and path.getPointAtLength | |
// For more info see: | |
// https://developer.mozilla.org/en-US/docs/Web/API/SVGPathElement | |
var path = document.getElementById('path') | |
var obj = document.getElementById('obj'); | |
// Length of path | |
var pathLength = Math.floor( path.getTotalLength() ); | |
// Move obj element along path based on percentage of total length | |
function moveObj(prcnt) | |
{ | |
prcnt = (prcnt*pathLength) / 100; | |
// Get x and y values at a certain point in the line | |
pt = path.getPointAtLength(prcnt); | |
pt.x = Math.round(pt.x); | |
pt.y = Math.round(pt.y); | |
obj.style.webkitTransform = 'translate3d('+pt.x+'px,'+pt.y+'px, 0)'; | |
} | |
// Initialize | |
moveObj(0); | |
// Slider functionality | |
var sliderEl = document.getElementById('slider'); | |
var sliderValEl = document.getElementById('slider_val'); | |
sliderEl.addEventListener('mousemove', function() { | |
sliderValEl.value = this.value; | |
moveObj(sliderValEl.value); | |
}); | |
// Animation functionality | |
// Use request animation frame for better performance | |
// if you're doing a lot of animation | |
var toggleAnimationBtn = document.getElementById('toggle_animation_btn') | |
var animationTimer = false; | |
function animationHandler(prcnt) { | |
moveObj(prcnt); | |
sliderEl.value = prcnt; | |
sliderValEl.value = prcnt; | |
if(prcnt < 100) | |
{ | |
animationTimer = setTimeout(function() { | |
animationHandler(prcnt+1); | |
},50) | |
} | |
else | |
{ | |
animationTimer = setTimeout(function() { | |
animationHandler(0); | |
}, 50); | |
} | |
} | |
toggleAnimationBtn.addEventListener('mouseup', function() { | |
if(animationTimer) { | |
clearTimeout(animationTimer); | |
animationTimer = false; | |
} | |
else | |
{ | |
animationTimer = animationHandler(0); | |
} | |
}); |
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body { | |
margin: 5em; | |
} | |
#obj { | |
background: blue; | |
width: 20px; | |
height: 20px; | |
border-radius: 10px; | |
position: absolute; | |
/* Align center */ | |
top:-10px; | |
left: -10px; | |
opacity: 0.5; | |
} | |
.container { | |
width: 438px; | |
margin: 0 auto; | |
position: relative; | |
} | |
input[type="range"] { | |
width: 400px; | |
} |
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