利用我在SVG地图上拥有的随机标记，我想将它们准确地放置在SVG地图（即实际位置地图）中。
const SVG_NS = 'http://www.w3.org/2000/svg';
// the number of random points on the map
let circlesLength = 30;
// the bounding box of the path
let bb = thePath.getBBox();
//set the svg viewBox attribute
svg.setAttributeNS(null,"viewBox",`${bb.x} ${bb.y} ${bb.width} ${bb.height}`)
// svg client rect
let cr = svg.getBoundingClientRect();
let n = 0;//a counter
for(let i = 0; i < 100; i++){
// get a random point on the svg canvas
let x = randomIntFromInterval(cr.x,(cr.x+cr.width));
let y = randomIntFromInterval(cr.y,(cr.y+cr.height));
//elementFromPoint returns the topmost Element at the specified coordinates (relative to the viewport).
let elmt = document.elementFromPoint(x, y);
// if the point is in path
if(elmt.className.baseVal == "path"){
//get the coordinates of the point on the svg
let svgPoint = getPoint(x,y);
//draw a circle with the center on the svg point
drawCircle({cx:svgPoint.x,cy:svgPoint.y,r:.01}, svg)
//incerase the counter
n++
};
// if you have already 6 points break the loop
if(n == circlesLength){break;}
}
// a function to get a random integer from an interval
function randomIntFromInterval(mn, mx) {
return ~~(Math.random() * (mx - mn + 1) + mn);
}
// a function to get the svg coordinates of a point on the svg canvas
function getPoint(x,y){
var p = svg.createSVGPoint();
p.x = x;
p.y = y;
var ctm = svg.getScreenCTM().inverse();
var p = p.matrixTransform(ctm);
return p;
}
// a function to draw a circle
function drawCircle(o, parent) {
var circle = document.createElementNS(SVG_NS, 'circle');
for (var name in o) {
if (o.hasOwnProperty(name)) {
circle.setAttributeNS(null, name, o[name]);
}
}
parent.appendChild(circle);
return circle;
}svg{border:1px solid;overflow:visible;}
path{stroke:black;vector-effect:non-scaling-stroke;fill:gold;}
circle{fill:red;}<svg height=200 width=200 fill="none" viewBox='.6 1.1 1 1'>
<defs>
<symbol id="marker" viewBox="1.4 1.7 16 16">
<g transform="translate(0.0625 0.0475)">
<circle r="2" cx="8" cy="8" stroke="black" stroke-width="0.001" fill="red"/>
</g>
</symbol>
</defs>
<use id="theUse" xlink:href="#marker" width=".15" height=".15" x="1.05" y="1.55" />
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</svg>
答案 0 :(得分：2)
如果您需要精确放置点，这意味着您知道点在地图上的位置，并且需要将这些点保存在点数组中，例如：
let circlesArray = [
{cx:1.11,cy:1.64,r:.01},
{cx:1.23,cy:1.53,r:.01},
{cx:1.03,cy:1.77,r:.01},
{cx:1.18,cy:1.57,r:.01},
{cx:0.99,cy:1.77,r:.01},
{cx:1.25,cy:1.67,r:.01},
]
一旦有了点数组，就可以在地图上每绘制一个点。
const SVG_NS = 'http://www.w3.org/2000/svg';
// the number of random points on the map
let circlesArray = [
{cx:1.11,cy:1.64,r:.01},
{cx:1.23,cy:1.53,r:.01},
{cx:1.03,cy:1.77,r:.01},
{cx:1.18,cy:1.57,r:.01},
{cx:0.99,cy:1.77,r:.01},
{cx:1.25,cy:1.67,r:.01},
]
circlesArray.forEach(c=>{
drawCircle(c, svg)
})
// a function to draw a circle
function drawCircle(o, parent) {
var circle = document.createElementNS(SVG_NS, 'circle');
for (var name in o) {
if (o.hasOwnProperty(name)) {
circle.setAttributeNS(null, name, o[name]);
}
}
parent.appendChild(circle);
return circle;
}svg{border:1px solid;overflow:visible;}
path{stroke:black;vector-effect:non-scaling-stroke;fill:gold;}
circle{fill:red;}<svg id="svg" height=200 width=200 fill="none" viewBox='.6 1.1 1 1'>
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