我想在PixiOverlay上绘制svg标记。PixiOverlay.js (一个使用Pixi.js的绘图叠加)。我自己也是Pixi的新手，我想我已经把一些东西放在一起了，可以画出一个菱形，请看第一个代码片段（如果它不正确，或者需要改进，请告诉我）。
在pixiOverlay的github页面上有一个关于 漂亮的演示 渲染地图上的大量多边形。我已经将这个演示简化到最低限度（见下面第二个代码片段）。在这段代码中，有一个 drawPoly 函数，顾名思义，它是用来绘制多边形的。
我想用另一个函数来代替它，它只是在某个预定义的点上画出菱形的svg标记（可以是多边形坐标中的第一个点，或者只是一个随机的点）。
请问如何才能做到这一点？
在现实生活中，我有不少这样的标记，都是一些几何形状，如三角形、星形、正方形、圆形等，总共会有几千个这样的标记（比如100K甚至更多，当然这取决于缩放级别。在zoom=0时可能会接近一百万)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<script src='https://d157l7jdn8e5sf.cloudfront.net/dev/pixi.js'></script>
<!--<script src="https://cdn.rawgit.com/manubb/Leaflet.PixiOverlay/master/docs/js/example.min.js">--></script>
<script id="rendered-js">
var renderer;
renderer = PIXI.autoDetectRenderer();
document.body.appendChild(renderer.view);
var graphics = new PIXI.Graphics();
graphics.lineStyle(5, 0x00FF00, 1);
graphics.moveTo(0, 75);
graphics.lineTo(50, 0);
graphics.lineTo(100, 75);
graphics.lineTo(50, 150);
graphics.lineTo(0, 75);
graphics.cacheAsBitmap = true;
renderer.render(graphics);
</script>
</body>
</html><!DOCTYPE html>
<html style="height: 100%; margin: 0;">
<head>
<title>Leaflet.PixiOverlay example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<!--jquery -->
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<!--d3 -->
<script src='https://d3js.org/d3.v4.min.js'></script>
<!-- leaflet v 1.0.3 -->
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css"/>
<script src="https://unpkg.com/[email protected]/dist/leaflet-src.js"></script>
<!-- I think this Pixi.js and PixiOverlay.js in one file?? -->
<script src="https://cdn.rawgit.com/manubb/Leaflet.PixiOverlay/master/docs/js/example.min.js"></script>
</head>
<body style="height: 100%; margin: 0; overflow: hidden;">
<div id="mymap" style="height: 100%; width: 100%;" >
</div>
<script>
var countries =
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {"name": "UK"},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[-4.965, 58.58], [-5.97, 57.58], [-6.459, 56.31], [-5.05, 54.72],[-3.47, 54.36], [-4.08, 53.27],[-5.22, 51.78],[-3.38, 51.37],[-5.58, 50.12], [1.31, 51.09],[0.61, 51.42], [1.66, 52.69],[0.04, 52.88], [0.39, 53.40],[-2.32, 55.97], [-1.80, 57.53],[-3.95, 57.58], [-3.03, 58.60], [-4.96, 58.58],
]
]
}
},
{
"type": "Feature",
"properties": {"name": "France"},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[2.54, 51.09],[-4.65, 48.37],[-1.23, 46.01],[-1.49, 43.61],[3.03, 42.45],[3.64, 43.45],[7.69, 43.77], [5.97, 46.37],[8.04, 48.98],[2.54, 51.09],
]
]
}
}
]
};
function drawPoly(color, alpha, project, container) {
return function (poly) {
var shape = new PIXI.Polygon(poly[0].map(function (point) {
var proj = project([point[1], point[0]]);
return new PIXI.Point(proj.x, proj.y);
}));
container.beginFill(color, alpha);
container.drawShape(shape);
};
}
function renderChart() {
var map = L.map('mymap').setView(new L.LatLng(50, 1.0), 5);
L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
minZoom: 0,
maxZoom: 9
}).addTo(map);
map.zoomControl.setPosition('bottomright');
var firstDraw = true;
var pixiContainer = new PIXI.Graphics();
var doubleBuffering = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
var pixiOverlay = L.pixiOverlay(function (utils) {
var container = utils.getContainer();
var renderer = utils.getRenderer();
var project = utils.latLngToLayerPoint;
var bounds;
if (firstDraw) {
countries.features.forEach(function (feature, index) {
var color = 0xFF0000,
alpha = 0.8;
if (feature.geometry === null) return;
if (feature.geometry.type === 'Polygon') {
bounds = L.bounds(feature.geometry.coordinates[0]);
drawPoly(color, alpha, project, container)(feature.geometry.coordinates);
}
});
}
firstDraw = false;
renderer.render(container);
}, pixiContainer, {
doubleBuffering: doubleBuffering,
destroyInteractionManager: true
});
pixiOverlay.addTo(map);
};
renderChart()
</script>
</body>
</html>就像drawPoly()一样，为drawMarker()做另一个函数，把你的标记代码放在里面，然后传递容器(就像你给的例子一样)。
我已经用了你的例子。
<!DOCTYPE html>
<html style="height: 100%; margin: 0;">
<head>
<title>Leaflet.PixiOverlay example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<!--jquery -->
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<!--d3 -->
<script src='https://d3js.org/d3.v4.min.js'></script>
<!-- leaflet v 1.0.3 -->
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css"/>
<script src="https://unpkg.com/[email protected]/dist/leaflet-src.js"></script>
<!-- I think this Pixi.js and PixiOverlay.js in one file?? -->
<script src="https://cdn.rawgit.com/manubb/Leaflet.PixiOverlay/master/docs/js/example.min.js"></script>
</head>
<body style="height: 100%; margin: 0; overflow: hidden;">
<div id="mymap" style="height: 100%; width: 100%;" >
</div>
<script>
var countries =
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {"name": "UK"},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[-4.965, 58.58], [-5.97, 57.58], [-6.459, 56.31], [-5.05, 54.72],[-3.47, 54.36], [-4.08, 53.27],[-5.22, 51.78],[-3.38, 51.37],[-5.58, 50.12], [1.31, 51.09],[0.61, 51.42], [1.66, 52.69],[0.04, 52.88], [0.39, 53.40],[-2.32, 55.97], [-1.80, 57.53],[-3.95, 57.58], [-3.03, 58.60], [-4.96, 58.58],
]
]
}
},
{
"type": "Feature",
"properties": {"name": "France"},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[2.54, 51.09],[-4.65, 48.37],[-1.23, 46.01],[-1.49, 43.61],[3.03, 42.45],[3.64, 43.45],[7.69, 43.77], [5.97, 46.37],[8.04, 48.98],[2.54, 51.09],
]
]
}
}
]
};
function drawMarker(container, coords)
{
var graphics = new PIXI.Graphics();
graphics.lineStyle(10, 0xFFF0000, 1);
graphics.moveTo(0, 75);
graphics.lineTo(50, 0);
graphics.lineTo(100, 75);
graphics.lineTo(50, 150);
graphics.lineTo(0, 75);
graphics.cacheAsBitmap = true;
//graphics.width = 1000;
posX = 3000; //just a temp value
posY = 2000; // just a temp value
graphics.x = posX;
graphics.y = posY;
console.log(graphics.y);
container.addChild(graphics);
}
function drawPoly(color, alpha, project, container) {
return function (poly) {
var shape = new PIXI.Polygon(poly[0].map(function (point) {
var proj = project([point[1], point[0]]);
return new PIXI.Point(proj.x, proj.y);
}));
container.beginFill(color, alpha);
container.drawShape(shape);
};
}
function renderChart() {
var map = L.map('mymap').setView(new L.LatLng(50, 1.0), 5);
L.tileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
minZoom: 0,
maxZoom: 9
}).addTo(map);
map.zoomControl.setPosition('bottomright');
var firstDraw = true;
var pixiContainer = new PIXI.Graphics();
var doubleBuffering = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
var pixiOverlay = L.pixiOverlay(function (utils) {
var container = utils.getContainer();
var renderer = utils.getRenderer();
var project = utils.latLngToLayerPoint;
var bounds;
if (firstDraw) {
countries.features.forEach(function (feature, index) {
var color = 0xFF0000,
alpha = 0.8;
if (feature.geometry === null) return;
if (feature.geometry.type === 'Polygon') {
bounds = L.bounds(feature.geometry.coordinates[0]);
// drawPoly(color, alpha, project, container)(feature.geometry.coordinates);
drawMarker(container, feature.geometry.coordinates);
}
});
}
firstDraw = false;
renderer.render(container);
}, pixiContainer, {
doubleBuffering: doubleBuffering,
destroyInteractionManager: true
});
pixiOverlay.addTo(map);
};
renderChart()
</script>
</body>
</html>