I'm trying to create a clickable map. The idea is that clicking on a region starts a zoom animation pointed to that specific area.
So far i managed to calcuate the center of each SVG rectangle that contain a region with getBBox(). This is visualized as a purple circle
Now I'm having trouble understanding how to scale on specific coordinates, which based on my idea are the same calculated in the previous step.
The code below basically updates the transform-origin style property of the<g id="italy" > group element every time a different <path> is clicked.
Question is how to scale an SVG and center on specific coordinates? Or How to scale a SVG and center only a path with specific ID?
.c {
fill: rebeccapurple;
transition: 1s;
fill-opacity: 0.7;
stroke: #000000;
stroke-width: 0.4px;
transform: scale(0.7);
}
.c-zoom{
transform: scale(2);
}
.d:hover {
fill-opacity: 1;
}
.map-container{
position: relative;
}<html>
<head>
<title>test</title>
<link rel="stylesheet" href="test2.css">
</head>
<body>
<div id="map">
<svg
xmlns:mapsvg="http://mapsvg.com"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns="http://www.w3.org/2000/svg"
mapsvg:geoViewBox="6.624486 47.092916 18.521301 35.490303"
width="430"
height="515"
id="svg">
<g id="italy" >
<circle id="circle" cx="121" cy="495" r="5"></circle>
<path
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title="Emilia-Romagna"
id="IT-45" />
<path
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title="Liguria"
id="IT-42" />
<path
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title="Lombardia"
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d="m 303.90021,157.45051 -1.35,0.77 0.94,-1.05 -0.9,-0.37 1.6,-0.18 -0.29,0.83 z m -1.64,-2.1 1.19,0.9 -2.37,0.53 0.62,-1.75 0.56,0.32 z m -0.37,-124.080005 2.84,1.95 5.54,-0.56 2.07,0.74 0.89,1.09 0,0 -0.19,1.8 0.97,1.66 -0.7,2.27 0.88,1.16 -2.55,0.06 -3.46,2.18 -0.12,0.94 1.23,0.8 0.4,1.74 -1.82,-0.78 -1.04,0.79 -1.85,-0.79 -1.57,1.25 -0.41,-0.43 -1.48,2.04 -0.28,1.75 -2,1.76 0.32,1.39 -0.6,-0.27 0.18,0.6 -1.83,0.93 -0.33,2.02 -1.91,-0.27 -1.04,0.84 0.04,1.99 -1.8,1.89 2.12,2.85 2.08,-0.01 0.26,1.58 1.84,-0.1 0.3,2.13 2.42,1.95 -0.45,3.58 -2.9,1.96 -1.77,2.81 0.92,0.8 0.71,2.6 0.02,3.47 1.43,0.04 1.05,1.51 1.48,0.01 1.26,4.53 1.39,1.26 -0.21,1.2 2,1.05 0.68,-1.6 1.24,0.66 0.12,0.9 1.12,0.52 0.05,1.62 3.88,-3.59 0.67,0.68 1.98,-2.1 1.13,0.84 -0.43,1 0.63,0.73 0.55,-1.04 2.17,-1.08 0.64,0.07 -0.4,1.1 1.25,1.14 1.52,-0.94 0.49,1.09 1.55,-0.5 -0.45,-1.41 0.59,-0.24 0.58,1.58 -0.04,0.31 0.4,0.37 -0.17,0.82 0.82,0.35 -1.09,0.64 2.03,1.93 -0.49,0.26 0.65,1.300005 -0.35,1.17 0.97,-0.71 0.57,2.67 0.79,0.2 -0.37,0.8 1.01,0.81 -0.17,1.32 0.98,-0.12 -0.12,0.61 1.07,0.6 0,0 -0.56,0.77 -4.92,0.34 0.09,-0.75 -0.91,-0.35 -0.48,1.36 -3,0.39 -0.95,1.29 -6.26,3.91 -15.92,7.41 -1.53,1.97 -1.67,-0.84 -1.92,2.58 -1.44,2.81 -0.1,1.08 0.83,0.39 -1.08,0.4 -1.56,6.49 1.36,0.42 -1.08,1.07 0.57,2.52 1.28,1.45 -0.29,5.3 1.44,1.22 1.58,3.1 -0.51,-0.34 -0.8,0.95 0.91,0.56 0.86,-0.63 -0.24,1.11 0.51,0.14 0.55,-0.31 -0.44,-1.76 0.49,0.03 4.3,5.37 -0.66,4.47 -1.07,0.98 0.04,2.85 -1.6,-0.55 0.34,-2.86 -1.02,-0.44 -0.92,0.38 -0.75,1.72 0.87,1.09 -0.38,2.07 0.78,0.66 0.65,-0.45 0.06,0.72 -1.32,-0.13 -0.11,1.44 -2.41,-1.92 0,0 -0.6,-2.18 -1.99,-0.51 -0.64,-0.95 -0.33,-2.89 0.63,-1.24 -0.83,-1.08 -1.08,0.01 -1.46,1.29 -2.15,-0.17 -0.81,-1.05 -1.48,0.97 -2.29,-3.08 -6.7,-1.07 -2.2,0.78 -6.27,-0.08 -2.92,1.36 -0.74,2.22 -3.19,0.9 -2.01,1.9 -1.24,0.12 -0.71,-0.24 -0.43,-1.62 -2.1,-1.41 -5.7,0.38 -0.16,-1.49 0,0 -0.23,-1.03 -7.98,-4.28 0,-2.46 -1.42,0.85 -3.13,-1.16 0.59,-1.62 -0.41,-1.01 1.27,-1.02 -3,-1.12 -0.93,1.68 -1.36,-0.73 -0.24,1.27 -1.2,-0.22 -2.32,-1.95 0.96,-1.88 -0.87,-0.55 -1.61,0.32 0.38,-1.71 -0.79,-1.22 -2.87,-1.3 0.1,-1.3 -1.82,-0.48 -0.11,-0.68 -2.64,-0.59 -1.12,-2.35 -1.96,-1.92 -2.41,2.01 -0.51,-0.99 -1.49,-0.38 0.68,-1.91 -0.99,-1.49 1.3,-0.97 -0.96,-0.75 0.96,-2.57 -2.46,-1.13 -0.7,0.81 -0.83,-0.18 0.41,-1.98 -1.13,-11.75 11.09,-16.500005 0,0 2.68,1.66 -1.28,1.1 0.77,1.52 -2.18,4.030005 2.18,0.01 2.05,1.02 -0.65,1.13 1.49,0.93 1.49,-1.69 0.49,1.05 1.85,-2.66 0.44,1.17 1.64,-0.88 1.93,1.84 1.6,0.21 2.5,-3.37 -0.13,-3.600005 1.55,0.15 -0.6,-2.37 2.35,-2.83 0.87,-4.9 2.42,0.18 -0.02,-1.36 0.07,0.78 2.48,1.34 -0.35,-0.98 0.68,-1.54 1.29,-0.16 -0.37,-2.84 3.62,0.23 2.74,-2.26 2.15,-0.29 1.89,0.6 0.54,2.81 4.21,0.3 0.91,-1.87 -1.14,-2.02 0.73,-0.8 -0.73,-0.68 2.06,-0.6 -0.93,-1.54 0.01,-2.02 2.74,-0.87 0.67,0.77 0.74,-0.77 2.24,0.24 4.18,-1.46 1.71,-3.95 1.1,0.44 0.6,-1.6 -2.42,-2.22 0.79,-1.97 -1.21,-0.58 -0.64,0.41 -0.44,-1.94 -2.16,0.5 -0.79,-0.7 0.68,-1.89 -0.58,-1.41 -2.92,-2.43 2.36,-1.44 0.81,0.74 0.27,-3.66 2.3,-2.71 -0.59,-1.39 -3.08,-0.42 0.12,-1.65 4.87,-2.46 1.57,0.33 1.17,-1.18 1.16,-0.07 0.58,0.77 2.47,-3.92 -0.17,-1.48 1.52,-2.69 -0.31,-2.33 3.94,3.08 0.83,-0.29 1.55,0.98 0.11,2.26 3.34,-2.65 1.21,0.76 2.98,-0.94 0.75,0.89 1.26,-0.06 0.51,-0.46 -0.38,-1.32 0.87,0.2 1.67,-1.88 2.47,-0.92 0,0 1.41,-0.09 z"
title="Veneto"
id="IT-34" />
</g>
</svg>
</div>
<button id="btn" >Debug button</button>
<script>
window.addEventListener("load",function(){
let ita = document.getElementById("italy");
let btn = document.getElementById("btn");
let regions = document.getElementsByClassName("d")
btn.addEventListener("click",(e)=>{
ita.classList.toggle("c-zoom")
})
for(r of regions){
r.addEventListener("click",(e)=>{
let childPos = e.target.getBBox();
const x = childPos.x childPos.width/2
const y = childPos.y childPos.height/2
const fin = x "px " y "px"
console.log(fin)
document.getElementById("circle").setAttribute("cx", x);
document.getElementById("circle").setAttribute("cy", y);
ita.style['transform-origin'] = fin;
ita.classList.toggle("c-zoom")
})
}
},false)
</script>
</body>
</html>CodePudding user response：
Unless I'm misunderstanding the problem, the issue most likely comes from animating the g element inside the svg's viewbox.
So do the transform-origin and class toggle on the entire svg instead. You might need to add some CSS transition if you go this route for a smooth animation, something like transition: all ease-in-out .2s; on #svg and .c-zoom
CodePudding user response：
IMO you have three main issues here.
The "sway" during zooming is caused by the fact that you are moving the
transform-originat the same time you are zooming. You can fix that by ensuring that only the transform is affected by thetransitionsetting.transition: transform 1s;Secondly, because the element already has
scale(0.7), when you replace it withscale(2)the map jumps. You can fix that by moving the initial scale to a parent container. But for my example below, I've just removed that initial zoom.Finally, I presume you really want to zoom the region into the middle of the screen. The problem with the current method is that you are zooming around the new transform origin. So the cntre of the region stays where it is. You can fix this by adjusting the calculated transform-origin so that the region moves towards the centre of the screen when zooming.
window.addEventListener("load",function(){
let ita = document.getElementById("italy");
let btn = document.getElementById("btn");
let regions = document.getElementsByClassName("d");
let centreX = 215;
let centreY = 257.5;
btn.addEventListener("click",(e)=>{
ita.classList.toggle("c-zoom")
})
for(r of regions){
r.addEventListener("click",(e)=>{
let childPos = e.target.getBBox();
const x = childPos.x childPos.width/2
const y = childPos.y childPos.height/2
// Calculate an origin offset that means that when scaled by "zoom",
// the point x,y ends up at the centre of the SVG.
const zoom = 2;
const dx = (x - centreX) / (zoom - 1);
const dy = (y - centreY) / (zoom - 1);
const fin = (x dx) "px " (y dy) "px"
//console.log(fin)
document.getElementById("circle").setAttribute("cx", x);
document.getElementById("circle").setAttribute("cy", y);
ita.style['transform-origin'] = fin;
ita.classList.toggle("c-zoom")
})
}
},false).c {
fill: rebeccapurple;
transition: transform 1s;
fill-opacity: 0.7;
stroke: #000000;
stroke-width: 0.4px;
}
.c-zoom{
transform: scale(2);
}
.d:hover {
fill-opacity: 1;
}
.map-container{
position: relative;
}
svg {
border: solid 1px black;
}<div id="map">
<svg
xmlns:mapsvg="http://mapsvg.com"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns="http://www.w3.org/2000/svg"
mapsvg:geoViewBox="6.624486 47.092916 18.521301 35.490303"
width="430"
height="515"
id="svg">
<g id="italy" >
<circle id="circle" cx="121" cy="495" r="5"></circle>
<path
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title="Emilia-Romagna"
id="IT-45" />
<path
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title="Liguria"
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<button id="btn" >Debug button</button>