Develop Reference

Trying to calculate the value of a transform

I'm trying to make a function to calculate the value that I need to make the svg moving from a Point A to a Point B with an angle.
On this image, I have a flower
I would like to do that :
I'm trying to make a function to calculate the translateX, translateY and the degree of the rotation but that doesn't work and I don't know how to fix it, here's my code :
var texte = document.getElementsByClassName("texte");
//Here, the coordinates where I want each petal to arrive, I will try to make something to calculate it depending on the screen...
var arriveex = 1082.4940185546875;
var arriveey = 8.80517578125;
var arriveeright = 1402.2513427734375;
var arriveewidth = 319.75732421875;
var arriveeheight = 256.9661865234375;
//The function to calculate the distance between the starting point and the finishing point
function getDistanceX(x1, x2){
let x = x2 - x1;
return Math.sqrt(x*x);}
function getDistanceY(y1, y2) {
let y = y2 - y1;
return Math.sqrt(y*y);
}
//Here the loop for seeking the coordonate of each petal and add the animate function when I click on it
for (var i = 0 ; i < petale.length; i++) {
petale[i].addEventListener('click', function(){
var positions =this.getBoundingClientRect();
var xpetale = positions['x'];
var ypetale = positions['y'];
var bottompetale = positions['bottom'];
var rightpetale = positions['right'];
var distanceX = getDistanceX(xpetale,arriveex);
var distanceY = getDistanceY(ypetale, arriveey);
//Here, the function to calculate the angle with the Al Kashi formula
var adjx1 = Math.abs(arriveex-rightpetale);
var adjy1 = Math.abs(bottompetale-arriveey);
var adjx2 = Math.abs(xpetale-arriveex);
var adjy2 = Math.abs(arriveey-ypetale);
var adjx3 = Math.abs(xpetale-rightpetale);
var adjy3 = Math.abs(bottompetale-ypetale);
var side1 = Math.sqrt(adjx1*adjx1+adjy1*adjy1);
var side2 = Math.sqrt(adjx2*adjx2+adjy2*adjy2);
var side3 = Math.sqrt(adjx3*adjx3+adjy3*adjy3);
var angle = Math.acos(((side2*side2)+(side1*side1)-(side3*side3))/(2*side2*side1));
var deg = (angle*180/Math.PI);
this.animate([
// {transform : 'rotate(75deg) translateY(-1200px) translateX(150px) scale(1.3)'},
{transform :`rotate(${deg}deg)`+`translateX(${distanceX}px)` + `translateY(-${distanceY}px)`},
],
{
duration : 3000,
}
)
})
}
The animation doesn't work properly even if I move the rotation (because the order has an importance in CSS ! :p) so I don't know how to make it work for each petal.
I would like that each petal goes in the right place when I click on it so I need a function that can calculate the angle of the rotation and the translation that I need. I hope that it's clear, my english is maybe a little bad...
I can't put my svg because the code is too long even in answer.
Thank you !

I rather recommend to rebuild your petal group (flower) using transforms.
This way you can simplify the calculation of animated translate and rotate values significantly.
Example svg: rotated petals
let petals = document.querySelectorAll('.gPetal');
petals.forEach((petal)=>{
petal.addEventListener('click', (e)=>{
e.currentTarget.style.transform = 'rotate(0)'
})
})
svg {
width: 30em;
}
text {
font-family: "Segoe UI";
fill: #fff;
font-size: 6px;
user-select: none;
transform: translate(75%, 33%);
dominant-baseline: central;
text-anchor: middle;
}
.gPetal {
transition: 0.5s;
transform-box: fill-box;
transform-origin: center;
cursor:pointer
}
.gPetal[data-rotate="60"] {
transform: rotate(60deg);
}
.gPetal[data-rotate="120"] {
transform: rotate(120deg);
}
.gPetal[data-rotate="180"] {
transform: rotate(180deg);
}
.gPetal[data-rotate="240"] {
transform: rotate(240deg);
}
.gPetal[data-rotate="300"] {
transform: rotate(300deg);
}
<p>Click on a petal to reset rotation</p>
<svg x="0" y="0" width="400" viewBox="0 0 100 100" overflow="visible">
<defs>
<linearGradient id="gradient" gradientTransform="rotate(90)">
<stop offset="0%" stop-color="purple" />
<stop offset="90%" stop-color="red" />
</linearGradient>
</defs>
<symbol id="petal" viewBox="0 0 100 100">
<rect x="0" y="0" width="100%" height="100%" fill="none" stroke="green" stroke-width="0.5" />
<path fill="url(#gradient)" id="circle" d="M50 50 a25 25 0 1 1 50 0 z" />
</symbol>
<g class="gPetal gPetal6" data-rotate="300">
<use href="#petal" />
<text dy="5%" data-style="font-size:10px">Label 6</text>
</g>
<g class="gPetal gPetal5" data-rotate="240">
<use href="#petal" />
<text dy="5%" data-style="font-size:10px">Label 5</text>
</g>
<g class="gPetal gPetal4" data-rotate="180">
<use href="#petal" />
<text dy="5%">Label 4</text>
</g>
<g class="gPetal gPetal3" data-rotate="120">
<use href="#petal" />
<text dy="5%">Label 3</text>
</g>
<g class="gPetal gPetal2" data-rotate="60">
<use href="#petal" />
<text dy="5%">Label 2</text>
</g>
<g class="gPetal gPetal1" data-rotate="0">
<use href="#petal" />
<text dy="5%" data-style="font-size:10px">Label 1</text>
</g>
</svg>
Each petal is positioned in a square bounding box based on a reused <symbol> definition (for the petal's shape and fill).
They are rotated by an angle incremented by 60 degrees for each element.
This way we don't need additional translate transformations.
Admittedly some extra work, but it can also help to improve your apps performance by decreasing the svg's filesize.
Example: Highlighting/selecting petal
When a petal is selected, the rotation is reset to 0 degrees.
Besides you can add some x/y offsets to shift the element to the right.
The data-attribute data-rotate stores the initial rotation and helps to rewind the animation, when a petal gets clicked twice (so becomes deselected).
let svg = document.querySelector("svg");
let petals = svg.querySelectorAll(".gPetal");
petals.forEach((petal) => {
petal.addEventListener("click", (e) => {
let current = e.currentTarget;
let thisStyle = current.style.transform;
let baseRotation = current.getAttribute("data-rotate");
let ani = current.animate(
[
{ transform: "rotate(" + baseRotation + "deg)" },
{ transform: "rotate(0)", color: "#f00", offset: 0.5 },
{ transform: "rotate(0) translate(75%) scale(1.3)" }
],
{
duration: 500,
fill: "both"
}
);
//start animation + reset prevously animated
resetPetals(current, petals);
if (!current.classList.contains("active")) {
petal.classList.add("active");
ani.play();
}
//rewind animation
else {
petal.classList.remove("active");
ani.playbackRate = -1;
ani.play();
}
});
});
function resetPetals(current, petals) {
petals.forEach((petal, p) => {
let allAnimations = petal.getAnimations();
allAnimations.forEach((ani) => {
ani.playbackRate = 1;
ani.finish();
ani.cancel();
});
if (petal !== current) {
petal.classList.remove("active");
}
});
}
svg {
width: 30em;
border: 1px solid red;
}
text {
font-family: "Segoe UI";
fill: #fff;
font-size: 6px;
user-select: none;
transform: translate(75%, 33%);
dominant-baseline: central;
text-anchor: middle;
}
.gPetal {
transition: 0.5s;
transform-box: fill-box;
transform-origin: center;
cursor: pointer
}
.gPetal[data-rotate="60"] {
transform: rotate(60deg);
}
.gPetal[data-rotate="120"] {
transform: rotate(120deg);
}
.gPetal[data-rotate="180"] {
transform: rotate(180deg);
}
.gPetal[data-rotate="240"] {
transform: rotate(240deg);
}
.gPetal[data-rotate="300"] {
transform: rotate(300deg);
}
.active {
fill: red;
}
<svg viewBox="0 0 800 400">
<defs>
<linearGradient id="gradient" gradientTransform="rotate(90)">
<stop offset="0%" stop-color="purple" />
<stop offset="90%" stop-color="red" />
</linearGradient>
</defs>
<symbol id="petal" viewBox="0 0 100 100">
<rect x="0" y="0" width="100%" height="100%" fill="none" />
<path fill="url(#gradient)" id="circle" d="M50 50 a25 25 0 1 1 50 0 z" />
</symbol>
<svg x="0" y="0" width="400" viewBox="0 0 100 100" overflow="visible">
<g class="gPetal gPetal6" data-rotate="300">
<use href="#petal" />
<text dy="5%" data-style="font-size:10px">Label 6</text>
</g>
<g class="gPetal gPetal5" data-rotate="240">
<use href="#petal" />
<text dy="5%" data-style="font-size:10px">Label 5</text>
</g>
<g class="gPetal gPetal4" data-rotate="180">
<use href="#petal" />
<text dy="5%">Label 4</text>
</g>
<g class="gPetal gPetal3" data-rotate="120">
<use href="#petal" />
<text dy="5%">Label 3</text>
</g>
<g class="gPetal gPetal2" data-rotate="60">
<use href="#petal" />
<text dy="5%">Label 2</text>
</g>
<g class="gPetal gPetal1" data-rotate="0">
<use href="#petal" />
<text dy="5%" data-style="font-size:10px">Label 1</text>
</g>
</svg>
</svg>

Divide semi circle with stroke-dasharray and on active color fill

I'm working on an SVG gauge meter here I want to divide the semi-circle into parts when the range slider move on active stroke fill with gradient color. And want to add one more black color running track when the meter needle moves. I had tried using stroke-dasharray but after adding this all colors are coming at a time meter is not working properly.
I want to divide the semi-circle into parts when the range slider move on active stroke fill with gradient color
And I want to add one more black color running track when the meter needle moves.
My code here
/* set radius for all circles */
var r = 400;
var circles = document.querySelectorAll('.circle');
var total_circles = circles.length;
for (var i = 0; i < total_circles; i++) {
circles[i].setAttribute('r', r);
}
/* set meter's wrapper dimension */
var meter_dimension = (r * 2) + 100;
var wrapper = document.querySelector('#wrapper');
wrapper.style.width = meter_dimension + 'px';
wrapper.style.height = meter_dimension + 'px';
/* add strokes to circles */
var cf = 2 * Math.PI * r;
var semi_cf = cf / 2;
var semi_cf_1by3 = semi_cf / 3;
var semi_cf_2by3 = semi_cf_1by3 * 2;
document.querySelector('#outline_curves').setAttribute('stroke-dasharray', semi_cf + ',' + cf);
document.querySelector('#high').setAttribute('stroke-dasharray', semi_cf + ',' + cf);
document.querySelector('#avg').setAttribute('stroke-dasharray', semi_cf_2by3 + ',' + cf);
document.querySelector('#low').setAttribute('stroke-dasharray', semi_cf_1by3 + ',' + cf);
document.querySelector('#outline_ends').setAttribute('stroke-dasharray', 2 + ',' + (semi_cf - 2));
document.querySelector('#mask').setAttribute('stroke-dasharray', semi_cf + ',' + cf);
/*bind range slider event*/
var slider = document.querySelector('#slider');
var lbl = document.querySelector("#lbl");
var mask = document.querySelector('#mask');
var meter_needle = document.querySelector('#meter_needle');
function range_change_event() {
var percent = slider.value
var meter_value = semi_cf - ((percent * semi_cf) / 100);
mask.setAttribute('stroke-dasharray', meter_value + ',' + cf);
meter_needle.style.transform = 'rotate(' + (450 - ((percent * 180) / 100)) + 'deg)';
lbl.textContent = percent + '%';
}
slider.addEventListener('input', range_change_event);
#wrapper {
position: relative;
margin: auto;
}
#meter {
width: 100%;
height: 100%;
transform: rotate(180deg);
}
.circle {
fill: none;
}
.outline,
#mask {
stroke: #F1F1F1;
stroke-width: 65;
}
.range {
stroke-width: 60;
}
#slider,
#lbl {
position: absolute;
}
#slider {
position: absolute;
transform: rotate(180deg);
cursor: pointer;
left: 0;
margin: auto;
right: 0;
top: 58%;
width: 94%;
}
#lbl {
background-color: #4B4C51;
border-radius: 2px;
color: white;
font-family: 'courier new';
font-size: 15pt;
font-weight: bold;
padding: 4px 4px 2px 4px;
right: -48px;
top: 57%;
}
#meter_needle {
height: 40%;
left: 0;
margin: auto;
position: absolute;
right: 0;
top: 10%;
transform-origin: bottom center;
/*orientation fix*/
transform: rotate(450deg);
width: 5px;
background-color: red;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<body>
<div id="wrapper">
<svg id="meter">
<circle id="outline_curves" class="circle outline" cx="50%" cy="50%">
</circle>
<circle id="high" class="circle range" cx="50%" cy="50%" stroke="#FDE47F">
</circle>
<circle id="avg" class="circle range" cx="50%" cy="50%" stroke="#7CCCE5">
</circle>
<circle id="low" class="circle range" cx="50%" cy="50%" stroke="#E04644">
</circle>
<circle id="mask" class="circle" cx="50%" cy="50%" >
</circle>
<circle id="outline_ends" class="circle outline" cx="50%" cy="50%">
</circle>
</svg>
<svg version="1.1" id="meter_needle" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="16.721px" height="93.834px" viewBox="0 0 16.721 93.834" enable-background="new 0 0 16.721 93.834" xml:space="preserve">
<path fill="#464646" d="M13.886,84.243L2.83,83.875c0,0,3.648-70.77,3.956-74.981C7.104,4.562,7.832,0,8.528,0
c0.695,0,1.752,4.268,2.053,8.894C10.883,13.521,13.886,84.243,13.886,84.243z"/>
<path fill="#464646" d="M16.721,85.475c0,4.615-3.743,8.359-8.36,8.359S0,90.09,0,85.475c0-4.62,3.743-8.363,8.36-8.363
S16.721,80.855,16.721,85.475z"/>
<circle fill="#EEEEEE" cx="8.426" cy="85.471" r="2.691"/>
</svg>
<input id="slider" type="range" min="25" max="100" step="25" value="0" />
<label id="lbl" id="value" for="">0%</label>
</div>
<script src="script.js"></script>
</body>
Can anyone suggest to me how to achieve this output. Any help will be appreciate.
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="65px" height="51.333px" viewBox="0 0 65 51.333" enable-background="new 0 0 65 51.333" xml:space="preserve">
<g>
<defs>
<rect id="SVGID_1_" x="-157.417" y="-176.417" width="648" height="864"/>
</defs>
<clipPath id="SVGID_2_">
<use xlink:href="#SVGID_1_" overflow="visible"/>
</clipPath>
<g clip-path="url(#SVGID_2_)">
<defs>
<rect id="SVGID_3_" x="-157.417" y="-176.417" width="648" height="864"/>
</defs>
<clipPath id="SVGID_4_">
<use xlink:href="#SVGID_3_" overflow="visible"/>
</clipPath>
</g>
<g clip-path="url(#SVGID_2_)">
<defs>
<rect id="SVGID_5_" x="-157.417" y="-176.417" width="648" height="864"/>
</defs>
<clipPath id="SVGID_6_">
<use xlink:href="#SVGID_5_" overflow="visible"/>
</clipPath>
</g>
<g clip-path="url(#SVGID_2_)">
<defs>
<rect id="SVGID_7_" x="-157.417" y="-176.417" width="648" height="864"/>
</defs>
<clipPath id="SVGID_8_">
<use xlink:href="#SVGID_7_" overflow="visible"/>
</clipPath>
<path clip-path="url(#SVGID_8_)" fill="#FFFFFF" d="M19.527,44.274c-1.653,5.015-7.059,7.738-12.071,6.085
c-5.015-1.654-7.739-7.058-6.087-12.071c1.652-5.015,7.058-7.739,12.072-6.084C18.456,33.855,21.179,39.26,19.527,44.274"/>
<path clip-path="url(#SVGID_8_)" fill="#58595B" d="M19.514,44.289c-1.652,5.013-7.056,7.736-12.066,6.083
c-5.014-1.653-7.736-7.056-6.084-12.067c1.652-5.013,7.055-7.736,12.068-6.083C18.443,33.875,21.166,39.277,19.514,44.289"/>
<path clip-path="url(#SVGID_8_)" fill="#FFFFFF" d="M17.318,43.564c-1.253,3.801-5.35,5.865-9.15,4.612
c-3.797-1.253-5.863-5.35-4.609-9.148c1.254-3.8,5.349-5.865,9.148-4.612C16.506,35.67,18.57,39.766,17.318,43.564"/>
<path clip-path="url(#SVGID_8_)" fill="#58595B" d="M19.266,34.944c2.242,3.113,2.33,7.115,0.57,10.255l45.249-43.24L9.721,31.148
C13.256,30.475,17.023,31.828,19.266,34.944"/>
<defs>
<filter id="Adobe_OpacityMaskFilter" filterUnits="userSpaceOnUse" x="6.52" y="-11.184" width="62.369" height="60.661">
<feFlood style="flood-color:white;flood-opacity:1" result="back"/>
<feBlend in="SourceGraphic" in2="back" mode="normal"/>
</filter>
</defs>
<mask maskUnits="userSpaceOnUse" x="6.52" y="-11.184" width="62.369" height="60.661" id="SVGID_9_">
<g filter="url(#Adobe_OpacityMaskFilter)">
<g enable-background="new ">
<g enable-background="new ">
<g>
<defs>
<path id="SVGID_10_" d="M17.516,29.352c2.243,0.335,3.028,2.134,3.028,2.134L57.891,6.807L17.516,29.352z"/>
</defs>
<clipPath id="SVGID_11_" clip-path="url(#SVGID_8_)">
<use xlink:href="#SVGID_10_" overflow="visible"/>
</clipPath>
<defs>
<filter id="Adobe_OpacityMaskFilter_1_" filterUnits="userSpaceOnUse" x="6.52" y="-11.184" width="62.369" height="60.661">
<feFlood style="flood-color:white;flood-opacity:1" result="back"/>
<feBlend in="SourceGraphic" in2="back" mode="normal"/>
</filter>
</defs>
<mask maskUnits="userSpaceOnUse" x="6.52" y="-11.184" width="62.369" height="60.661" id="SVGID_9_">
<g filter="url(#Adobe_OpacityMaskFilter_1_)">
<g enable-background="new ">
</g>
</g>
</mask>
<linearGradient id="SVGID_12_" gradientUnits="userSpaceOnUse" x1="-236.1787" y1="699.8169" x2="-235.1792" y2="699.8169" gradientTransform="matrix(36.5072 -22.3825 22.3825 36.5072 -7021.3823 -30804.627)">
<stop offset="0" style="stop-color:#FFFFFF"/>
<stop offset="0.0466" style="stop-color:#D5D7D8"/>
<stop offset="0.0983" style="stop-color:#B1B3B6"/>
<stop offset="0.1557" style="stop-color:#929497"/>
<stop offset="0.2174" style="stop-color:#797A7D"/>
<stop offset="0.2847" style="stop-color:#626366"/>
<stop offset="0.3595" style="stop-color:#4E4E50"/>
<stop offset="0.445" style="stop-color:#3B3B3C"/>
<stop offset="0.5476" style="stop-color:#202021"/>
<stop offset="0.6848" style="stop-color:#080809"/>
<stop offset="1" style="stop-color:#000000"/>
</linearGradient>
<polygon clip-path="url(#SVGID_11_)" mask="url(#SVGID_9_)" fill="url(#SVGID_12_)" points="28.547,49.477 68.889,24.744
46.861,-11.184 6.52,13.549 "/>
</g>
</g>
</g>
</g>
</mask>
<g opacity="0.8" clip-path="url(#SVGID_8_)">
<g>
<defs>
<rect id="SVGID_13_" x="6.52" y="-11.184" width="62.369" height="60.661"/>
</defs>
<clipPath id="SVGID_14_">
<use xlink:href="#SVGID_13_" overflow="visible"/>
</clipPath>
<g clip-path="url(#SVGID_14_)">
<defs>
<path id="SVGID_15_" d="M17.516,29.352c2.243,0.335,3.028,2.134,3.028,2.134L57.891,6.807L17.516,29.352z"/>
</defs>
<clipPath id="SVGID_16_">
<use xlink:href="#SVGID_15_" overflow="visible"/>
</clipPath>
<linearGradient id="SVGID_17_" gradientUnits="userSpaceOnUse" x1="-236.1787" y1="699.8169" x2="-235.1792" y2="699.8169" gradientTransform="matrix(36.5072 -22.3825 22.3825 36.5072 -7021.3823 -30804.627)">
<stop offset="0" style="stop-color:#FFFFFF"/>
<stop offset="0.1467" style="stop-color:#FFFFFF"/>
<stop offset="1" style="stop-color:#FFFFFF"/>
</linearGradient>
<polygon clip-path="url(#SVGID_16_)" fill="url(#SVGID_17_)" points="28.547,49.477 68.889,24.744 46.861,-11.184 6.52,13.549
"/>
</g>
</g>
</g>
<path clip-path="url(#SVGID_8_)" fill="#58595B" d="M12.709,42.044c-0.412,1.254-1.765,1.936-3.02,1.523
c-1.253-0.414-1.934-1.765-1.52-3.019c0.412-1.253,1.764-1.936,3.017-1.521C12.44,39.441,13.121,40.792,12.709,42.044"/>
</g>
</g>
</svg>

Here's a working SVG example, with a little bit of javascript.
It's not clear from your question what exactly you want the coloured divisions
to look like. For now I've just made them solid red. But you can make them look however you'd like by changing the fill of the <rect id="meter-colours" .../>.
let METER_DIVISIONS = 10;
let METER_DIVISIONS_GAP = 4;
// Initialise meter
let meterDivisionsElem = document.getElementById("meter-divisions");
// Calculate size of each meter division
let totalLen = meterDivisionsElem.getAttribute("r") * Math.PI;
let numGaps = METER_DIVISIONS - 1;
let divLen = (totalLen - METER_DIVISIONS_GAP * numGaps) / METER_DIVISIONS;
// Set meter divisions dash pattern
let pat = divLen + ' ' + METER_DIVISIONS_GAP + ' ';
meterDivisionsElem.setAttribute("stroke-dasharray", pat.repeat(numGaps) + ' ' + divLen + ' ' + totalLen);
// The slider form element
let sliderElem = document.getElementById("slider");
// The slider label element
let sliderLabelElem = document.getElementById("lbl");
// The needle element
let needleElem = document.getElementById("needle");
// The black bar element
let blackBarElem = document.getElementById("black-bar");
let blackBarLen = blackBarElem.getAttribute("r") * Math.PI;
// The meter colours element
let meterColoursElem = document.getElementById("meter-colours");
function setMeterTo(value)
{
// Update slider label
sliderLabelElem.textContent = value + '%';
// Update needle position
let rotation = value * 180 / 100;
needleElem.setAttribute("transform", "rotate(" + rotation + ")");
// Update black bar length
let barLen = value * blackBarLen / 100;
blackBarElem.setAttribute("stroke-dasharray", barLen + ' ' + (2 * blackBarLen));
// Update coloured division section of the meter
meterColoursElem.setAttribute("transform", "rotate(" + rotation + ")");
}
// Add an input change handler to the slider
sliderElem.addEventListener("input", function(evt) {
setMeterTo(evt.target.value);
});
// Initialise meter to start value
setMeterTo(25);
#wrapper {
width: 600px;
}
#slider {
width: 100%;
}
#needle {
stroke-linecap: round;
}
<div id="wrapper">
<svg id="meter" viewBox="0 0 200 110">
<defs>
<circle id="meter-divisions" r="90" stroke-width="20" stroke-dasharray="282.7"/>
<mask id="meter-divisions-mask">
<use xlink:href="#meter-divisions" stroke="white"/>
</mask>
</defs>
<g transform="translate(100,100) scale(1,-1)" fill="none">
<!-- The grey meter divisions -->
<use xlink:href="#meter-divisions" stroke="lightgrey"/>
<!-- The inner semicircular black bar -->
<circle id="black-bar" r="74" stroke="black" stroke-width="4" stroke-dasharray="232.5"/>
<!-- the needle -->
<line id="needle" x2="70" y2="0" stroke="black" stroke-width="2" stroke-dasharray="282.7"/>
<!-- The coloured form of the ,meter divisions that gets rotated into view with the needle.
It is initially off screen but gets revealed as it rotates. It is masked by using
a shape matching the gray divisions -->
<g mask="url(#meter-divisions-mask">
<rect id="meter-colours" x="-100" y="-100" width="200" height="100" fill="red"/>
</g>
</g>
</svg>
<input id="slider" type="range" min="25" max="100" step="25" value="25" />
<label id="lbl" id="value" for="">0%</label>
</div>
Update re new needle image
First let's simplify your needle image:
<svg width="650px" viewBox="0 0 65 51.333">
<g>
<path fill="#58595B" fill-rule="evenodd" d="M19.514,44.289c-1.652,5.013-7.056,7.736-12.066,6.083c-5.014-1.653-7.736-7.056-6.084-12.067c1.652-5.013,7.055-7.736,12.068-6.083C18.443,33.875,21.166,39.277,19.514,44.289 M17.318,43.564c-1.253,3.801-5.35,5.865-9.15,4.612c-3.797-1.253-5.863-5.35-4.609-9.148c1.254-3.8,5.349-5.865,9.148-4.612C16.506,35.67,18.57,39.766,17.318,43.564 M12.709,42.044c-0.412,1.254-1.765,1.936-3.02,1.523c-1.253-0.414-1.934-1.765-1.52-3.019c0.412-1.253,1.764-1.936,3.017-1.521C12.44,39.441,13.121,40.792,12.709,42.044"/>
<path fill="#58595B" d="M19.266,34.944c2.242,3.113,2.33,7.115,0.57,10.255l45.249-43.24L9.721,31.148C13.256,30.475,17.023,31.828,19.266,34.944"/>
<path fill="#FFFFFF" fill-opacity="0.8" d="M17.516,29.352c2.243,0.335,3.028,2.134,3.028,2.134L57.891,6.807L17.516,29.352z"/>
</g>
</svg>
To use this in your meter, we'll need to locate an accurate centre of rotation (the dot in the circle), and re-orient it so that it has zero angle. We may also need to adjust its scale to fit the meter.
By analysis and experimentation, the centre of rotation is at (10.44, 41.3) and the rotation needed to zero out the rotation is 35.8 deg.
Since the meter is centred at (0,0) we need to start by shifting and rotating the new needle by those amounts.
<svg width="650px" viewBox="0 0 65 51.333">
<g transform="rotate(35.8) translate(-10.44, -41.3)">
<path fill="#58595B" fill-rule="evenodd" d="M19.514,44.289c-1.652,5.013-7.056,7.736-12.066,6.083c-5.014-1.653-7.736-7.056-6.084-12.067c1.652-5.013,7.055-7.736,12.068-6.083C18.443,33.875,21.166,39.277,19.514,44.289 M17.318,43.564c-1.253,3.801-5.35,5.865-9.15,4.612c-3.797-1.253-5.863-5.35-4.609-9.148c1.254-3.8,5.349-5.865,9.148-4.612C16.506,35.67,18.57,39.766,17.318,43.564 M12.709,42.044c-0.412,1.254-1.765,1.936-3.02,1.523c-1.253-0.414-1.934-1.765-1.52-3.019c0.412-1.253,1.764-1.936,3.017-1.521C12.44,39.441,13.121,40.792,12.709,42.044"/>
<path fill="#58595B" d="M19.266,34.944c2.242,3.113,2.33,7.115,0.57,10.255l45.249-43.24L9.721,31.148C13.256,30.475,17.023,31.828,19.266,34.944"/>
<path fill="#FFFFFF" fill-opacity="0.8" d="M17.516,29.352c2.243,0.335,3.028,2.134,3.028,2.134L57.891,6.807L17.516,29.352z"/>
</g>
</svg>
The needle is now horizontal, and positioned at (0,0).
We can now integrate it into the previous solution:
let METER_DIVISIONS = 10;
let METER_DIVISIONS_GAP = 4;
// Initialise meter
let meterDivisionsElem = document.getElementById("meter-divisions");
// Calculate size of each meter division
let totalLen = meterDivisionsElem.getAttribute("r") * Math.PI;
let numGaps = METER_DIVISIONS - 1;
let divLen = (totalLen - METER_DIVISIONS_GAP * numGaps) / METER_DIVISIONS;
// Set meter divisions dash pattern
let pat = divLen + ' ' + METER_DIVISIONS_GAP + ' ';
meterDivisionsElem.setAttribute("stroke-dasharray", pat.repeat(numGaps) + ' ' + divLen + ' ' + totalLen);
// The slider form element
let sliderElem = document.getElementById("slider");
// The slider label element
let sliderLabelElem = document.getElementById("lbl");
// The needle element
let needleElem = document.getElementById("needle");
// The black bar element
let blackBarElem = document.getElementById("black-bar");
let blackBarLen = blackBarElem.getAttribute("r") * Math.PI;
// The meter colours element
let meterColoursElem = document.getElementById("meter-colours");
function setMeterTo(value)
{
// Update slider label
sliderLabelElem.textContent = value + '%';
// Update needle position
let rotation = value * 180 / 100;
needleElem.setAttribute("transform", "rotate(" + (-rotation) + ")");
// Update black bar length
let barLen = value * blackBarLen / 100;
blackBarElem.setAttribute("stroke-dasharray", barLen + ' ' + (2 * blackBarLen));
// Update coloured division section of the meter
meterColoursElem.setAttribute("transform", "rotate(" + rotation + ")");
}
// Add an input change handler to the slider
sliderElem.addEventListener("input", function(evt) {
setMeterTo(evt.target.value);
});
// Initialise meter to start value
setMeterTo(25);
#wrapper {
width: 600px;
}
#slider {
width: 100%;
}
#needle {
stroke-linecap: round;
}
<div id="wrapper">
<svg id="meter" viewBox="0 0 200 110">
<defs>
<circle id="meter-divisions" r="90" stroke-width="20" stroke-dasharray="282.7"/>
<mask id="meter-divisions-mask">
<use xlink:href="#meter-divisions" stroke="white"/>
</mask>
</defs>
<g transform="translate(100,100)">
<g transform="scale(1,-1)" fill="none">
<!-- The grey meter divisions -->
<use xlink:href="#meter-divisions" stroke="lightgrey"/>
<!-- The inner semicircular black bar -->
<circle id="black-bar" r="74" stroke="black" stroke-width="4" stroke-dasharray="232.5"/>
<!-- The coloured form of the ,meter divisions that gets rotated into view with the needle.
It is initially off screen but gets revealed as it rotates. It is masked by using
a shape matching the gray divisions -->
<g mask="url(#meter-divisions-mask">
<rect id="meter-colours" x="-100" y="-100" width="200" height="100" fill="red"/>
</g>
</g>
<!-- the needle -->
<g id="needle">
<g transform="rotate(35.8) translate(-10.44, -41.3)">
<path fill="#58595B" fill-rule="evenodd" d="M19.514,44.289c-1.652,5.013-7.056,7.736-12.066,6.083c-5.014-1.653-7.736-7.056-6.084-12.067c1.652-5.013,7.055-7.736,12.068-6.083C18.443,33.875,21.166,39.277,19.514,44.289 M17.318,43.564c-1.253,3.801-5.35,5.865-9.15,4.612c-3.797-1.253-5.863-5.35-4.609-9.148c1.254-3.8,5.349-5.865,9.148-4.612C16.506,35.67,18.57,39.766,17.318,43.564 M12.709,42.044c-0.412,1.254-1.765,1.936-3.02,1.523c-1.253-0.414-1.934-1.765-1.52-3.019c0.412-1.253,1.764-1.936,3.017-1.521C12.44,39.441,13.121,40.792,12.709,42.044"/>
<path fill="#58595B" d="M19.266,34.944c2.242,3.113,2.33,7.115,0.57,10.255l45.249-43.24L9.721,31.148C13.256,30.475,17.023,31.828,19.266,34.944"/>
<path fill="#FFFFFF" fill-opacity="0.8" d="M17.516,29.352c2.243,0.335,3.028,2.134,3.028,2.134L57.891,6.807L17.516,29.352z"/>
</g>
</g>
</g>
</svg>
<input id="slider" type="range" min="25" max="100" step="25" value="25" />
<label id="lbl" id="value" for="">0%</label>
</div>

My approach here is a pure CSS one ,i didn't use SVG and implementing JS code in this case is lot easier.
Output
var black = document.getElementsByClassName('black')[0];
var gradient = document.getElementsByClassName('gradient')[0]
var tick = document.getElementsByClassName('tick')[0];
var m = document.getElementById('m');
m.addEventListener('input', function() {
black.style.transform = gradient.style.transform = tick.style.transform = "translate(-50%,-50%)rotateZ(-" + (180 / 100) * m.value + "deg)"
});
* {
margin: 0px;
padding: 0px;
font-family: "arial";
}
.gauge_main,
.white,
.black,
.tick,
.gradient,
.chamber,
.meter {
position: absolute;
top: 50%;
left: 50%;
height: 280px;
width: 280px;
transform: translate(-50%, -50%);
transition: 0.4s;
}
.meter {
background-color: white;
height: 281px;
width: 281px;
border-radius: 50%;
clip-path: polygon(0 50%, 100% 50%, 100% 100%, 0 100%);
z-index: 1000;
}
.tick,
.chamber {
width: 160px;
height: 5px;
background: linear-gradient(to right, white 50%, black 50%);
z-index: 110;
transform-origin: 50%;
}
.tick {
z-index: 1001;
}
.chamber {
left: 50%;
background: white;
width: 280px;
height: 5px;
transform-origin: 50%;
transform: translate(-50%, -50%)rotateZ(calc(var(--i)*-20deg));
z-index: 20;
}
.white,
.black,
.gradient {
position: absolute;
background-color: black;
border-radius: 50%;
}
.white {
height: 180px;
width: 180px;
background-color: white;
z-index: 30;
}
.gradient {
height: 280px;
width: 280px;
background: linear-gradient(0deg, rgba(29, 216, 255, 1) 0%, rgba(4, 106, 255, 1) 50%, rgba(208, 212, 255, 1) 50%);
}
.black {
height: 200px;
width: 200px;
background: linear-gradient(to top, black 50%, rgba(208, 212, 255, 1) 50%);
box-shadow: 0px 0px 0px 5px white;
z-index: 25;
}
#keyframes load {
from {
transform: translate(-50%, -50%)rotateZ(0deg);
}
to {
transform: translate(-50%, -50%)rotateZ(-180deg);
}
}
input {
position: absolute;
top: 50%;
left: 50%;
width: 280px;
transform: translate(-50%, 50%);
}
<div class="gauge_main">
<div class="gradient"></div>
<div class="white"></div>
<div class="black"></div>
<div class="tick"></div>
<div style="--i:1" class="chamber"></div>
<div style="--i:2" class="chamber"></div>
<div style="--i:3" class="chamber"></div>
<div style="--i:4" class="chamber"></div>
<div style="--i:5" class="chamber"></div>
<div style="--i:6" class="chamber"></div>
<div style="--i:7" class="chamber"></div>
<div style="--i:8" class="chamber"></div>
<div style="--i:9" class="chamber"></div>
<div class="meter"></div>
</div>
<input type="range" id="m" name="meter" min="0" max="100" value="0">

Fill SVG by dragging pointer

I want to fill color in number shown in image by dragging the green circle onto white path(it should fill with solid color from behind as dragged). I have used SVG and path also drawn in it. The draggable circle is also part of same SVG.
I am open if this can be done without SVG in any way.
Tried making it on canvas but gave that up because i could not drag there on given path.
My code below
var data = Snap.path.toCubic(document.getElementById("path2").getAttribute('d'))
dataLength = data.length,
svgPoints = [],
pointsString = data.toString();
for (var i = 0; i < dataLength; i++) {
var seg = data[i];
if (seg[0] === "M") {
var point = {};
point.x = seg[1];
point.y = seg[2];
svgPoints.push(point);
} else {
for (var j = 1; j < 6; j += 2) {
var point = {};
point.x = seg[j];
point.y = seg[j + 1];
svgPoints.push(point);
}
}
}
TweenMax.set('.knob', { x: svgPoints[0].x, y: svgPoints[0].y })
var circle = document.querySelector(".knob");
var path2 = document.querySelector("#path2");
var insidePath = false;
var lastPoint = {
x: 0,
y: 0
};
var draggable = new Draggable(circle, {
liveSnap: {
points: svgPoints
},
});
body {
background-color: #222;
background-color: rgb(145, 140, 140);
text-align: center;
overflow: hidden;
}
svg {
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
#DiacoDesignLink,
#pens {
color: #fff;
}
<div id="container">
<svg id="Layer_1" x="0px" y="0px" width="159.129px" height="220px" viewBox="0 0 159.129 220"
enable-background="new 0 0 159.129 220" xml:space="preserve">
<g>
<g>
<g>
<g>
<path id="path1" fill-opacity="0.1" fill="#492015" stroke="#492015" stroke-width="2" d="M53.336,203.653c-1.298,0-3.084-0.039-5.461-0.119c-2.436-0.092-4.921-0.256-7.395-0.49
c-2.684-0.266-5.221-0.662-7.548-1.18c-2.998-0.666-5.336-1.623-7.147-2.926l-0.36-0.279c-1.794-1.531-3.288-3.475-4.511-5.83
c-1.01-1.92-1.9-4.066-2.642-6.373c-0.721-2.264-1.263-4.492-1.613-6.627c-0.367-2.186-0.554-4.188-0.554-5.945
c0-2.816,0.369-5.453,1.099-7.838c0.847-2.793,2.447-5.379,4.756-7.684c1.762-1.918,3.827-4.025,5.917-6.033
c2.04-1.969,3.972-3.863,5.738-5.629c2.023-2.174,4.901-5.242,8.487-9.061c3.534-3.768,7.361-8.021,11.374-12.639
c4.066-4.686,8.16-9.631,12.166-14.693c4.017-5.078,7.734-10.098,11.048-14.923c3.221-4.68,5.838-9.098,7.779-13.133
c1.644-3.399,2.512-6.299,2.512-8.391c0-1.375-0.297-2.325-0.962-3.083c-0.221-0.251-0.635-0.722-2.141-0.722
c-1.746,0-3.323,0.636-4.961,2.002c-2.642,2.201-5.342,4.639-8.025,7.248c-2.993,2.908-6.243,5.651-9.661,8.153
c-4.309,3.15-9.24,4.747-14.658,4.747c-6.606,0-11.969-2.07-15.938-6.153c-3.917-4.03-5.903-9.309-5.903-15.689
c0-7.845,1.773-15.239,5.271-21.979c3.415-6.558,7.982-12.276,13.577-16.998c5.478-4.625,11.74-8.323,18.614-10.99
c6.923-2.688,14.141-4.051,21.452-4.051c7.213,0,14.054,0.86,20.332,2.555c6.559,1.773,12.347,4.586,17.204,8.36
c4.975,3.873,8.934,8.849,11.769,14.79c2.816,5.913,4.244,13.005,4.244,21.083c0,6.229-1.081,12.806-3.213,19.55
c-2.046,6.456-4.772,13.028-8.104,19.534c-3.281,6.397-7.097,12.851-11.34,19.187c-4.183,6.23-8.548,12.273-12.975,17.967
c-4.371,5.615-8.796,10.916-13.156,15.758c2.113-0.24,4.252-0.48,6.417-0.719c8.575-0.955,16.974-1.439,24.959-1.439
c5.866,0,11.098,1.627,15.549,4.834c3.51,2.535,7.691,7.381,7.691,16.078c0,6.324-2.168,11.586-6.443,15.639
c-3.863,3.66-8.569,6.025-13.99,7.029c-4.546,1.066-10.146,2.094-16.107,2.953c-5.981,0.865-12.153,1.623-18.343,2.25
c-6.219,0.625-12.399,1.102-18.374,1.422C63.655,203.493,58.127,203.653,53.336,203.653z" />
</g>
</g>
</g>
</g>
<path id="path2" fill="none" stroke="#FFFFFF" stroke-linecap="round" stroke-miterlimit="10" d="M40.059,71.082
c0,0,13.449-34.797,52.919-31.959c13.451,0.967,33.333,16,11.667,52.667c0,0-26.563,43.722-48,64.999
c-4.263,4.23-20.334,22.002,1,24.002c0,0,31.666,3,72.333-11.668" />
<circle class="knob" r="25" fill="#88CE02" stroke-width="4" stroke="#fff" />
</svg>
</div>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.3/TweenMax.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.3/utils/Draggable.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/snap.svg/0.3.0/snap.svg-min.js"></script>
<script type="text/javascript" src="./sketch.js"></script>

How to make a random color function acting on svg groups call the same color for all elements in group

I have a function that creates a random color. I use this function in another function to call the color onclick of an svg groups. The problem is that all elements in the group get a random color, whilst it should be one random color for all elements in the group.
I have tried tweaking the function that calls the color. And I don't manage to tweak the random function properly.
function call1(){
const children = document.getElementById('btn1').children;
for(let i = 0; i < children.length; i++ ){
children[i].setAttribute('fill',getRandomColor());
}
}
function getRandomColor() {
var letters = '0123456789ABCDEF';
var color = '#';
for (var i = 0; i < 6; i++) {
color += letters[Math.floor(Math.random() * 16)];
}
return color;
}
function setRandomColor() {
$("#colorpad").css("background-color", getRandomColor());
}
#svg-object{
height: 100vh;
width: 100%;
background-size: cover;
background-position: center center;
border: 15px antiquewhite;
position: absolute;
}
<?xml version="1.0" encoding="utf-8"?>
<!-- Generator: Adobe Illustrator 16.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0) -->
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg id="svg-object" version="1.1" xmlns="http://www.w3.org/2000/svg"
xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
width="800px" height="754px" viewBox="0 0 800 754" enable-
background="new 0 0 800 754" xml:space="preserve">
<g id="btn1" onclick="call1()">
<polygon fill="#FF0013" points="366.699,131 410,56 453.301,131 "/>
<polygon fill="#07FF00" points="323.699,656 367,581 410.301,656
"/>
<polygon fill="#0000FF" points="409.699,656 453,581 496.301,656
"/>
<polygon points="366.699,581 410,656 453.301,581 "/>
</g>
</svg>
I expect all the elements in the group to change to one random color.``

Instead of calling the getRandomColor() inside the loop, call it outside and set in a variable.
function call1() {
const children = document.getElementById('btn1').children;
let color = getRandomColor();
for (let i = 0; i < children.length; i++) {
children[i].setAttribute('fill', color);
}
}
function getRandomColor() {
var letters = '0123456789ABCDEF';
var color = '#';
for (var i = 0; i < 6; i++) {
color += letters[Math.floor(Math.random() * 16)];
}
return color;
}
function setRandomColor() {
$("#colorpad").css("background-color", getRandomColor());
}
#svg-object {
height: 100vh;
width: 100%;
background-size: cover;
background-position: center center;
border: 15px antiquewhite;
position: absolute;
}
<?xml version="1.0" encoding="utf-8"?>
<!-- Generator: Adobe Illustrator 16.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0) -->
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg id="svg-object" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="800px" height="754px" viewBox="0 0 800 754" enable- background="new 0 0 800 754" xml:space="preserve">
<g id="btn1" onclick="call1()">
<polygon fill="#FF0013" points="366.699,131 410,56 453.301,131"/>
<polygon fill="#07FF00" points="323.699,656 367,581 410.301,656"/>
<polygon fill="#0000FF" points="409.699,656 453,581 496.301,656"/>
<polygon points="366.699,581 410,656 453.301,581"/>
</g>
</svg>

function call1() {
console.log('call1');
const children = document.getElementById('btn1').children;
var randomColor = getRandomColor();
for (let i = 0; i < children.length; i++) {
children[i].setAttribute('fill', randomColor);
}
}
Your getRandomColor function is working well.
But, for all elements, we need call getRandomColor once.

equivalent in JS of the resize css applied to an SVG element

I recently discover the CSS resize:
`
div {
resize: both;
overflow: auto;
}
`
There is also a polyFill, but none of them won't work for a SVG element :/
Is it possible at least ?

Starting from your code and #ChrisG's comment, you might do the following.
When one clicks on svg, wrap this svg into a resizable div and set the svg width and height attributes to '100%' so the svg would get the wrapper's size.
Then, when one resizes the div, the svg would be resized as well.
When one clicks out of the div, set the svg width and height attributes explicitly and remove the div.
See the snippet below:
window.addEventListener('DOMContentLoaded', () => {
document.addEventListener('click', (e) => {
var r = document.getElementById('r');
if (r && r != e.target) {
var svg = r.querySelector('svg');
svg.setAttribute('width', r.offsetWidth + 'px');
svg.setAttribute('height', r.offsetHeight + 'px');
r.replaceWith(svg);
}
var svg = e.target;
while (!!svg && svg.nodeName != 'svg')
svg = svg.parentElement;
if (!svg) return;
var r = document.createElement('div');
r.id = 'r';
r.style.width = svg.width.baseVal.valueAsString;
r.style.height = svg.height.baseVal.valueAsString;
svg.setAttribute('width', '100%');
svg.setAttribute('height', '100%');
svg.parentElement.insertBefore(r, svg);
r.appendChild(svg.parentElement.removeChild(svg));
});
});
svg {
background: #cef
}
#r {
display: inline-block;
box-sizing: border-box;
border: solid 1px;
resize: both;
overflow: hidden;
}
<svg width="100px" height="100px" viewBox="0 0 100 100">
<circle stroke="navy" stroke-width="5" fill="pink" cx="50" cy="50" r="40"/>
</svg>
<svg width="100px" height="100px" viewBox="0 0 100 100">
<circle stroke="green" stroke-width="5" fill="gold" cx="50" cy="50" r="40"/>
</svg>