82 lines
2.1 KiB
JavaScript
82 lines
2.1 KiB
JavaScript
import Map from '../src/ol/Map.js';
|
|
import View from '../src/ol/View.js';
|
|
import MultiPoint from '../src/ol/geom/MultiPoint.js';
|
|
import Point from '../src/ol/geom/Point.js';
|
|
import TileLayer from '../src/ol/layer/Tile.js';
|
|
import OSM from '../src/ol/source/OSM.js';
|
|
import _ol_style_Circle_ from '../src/ol/style/Circle.js';
|
|
import _ol_style_Fill_ from '../src/ol/style/Fill.js';
|
|
import _ol_style_Stroke_ from '../src/ol/style/Stroke.js';
|
|
import _ol_style_Style_ from '../src/ol/style/Style.js';
|
|
|
|
|
|
var map = new Map({
|
|
layers: [
|
|
new TileLayer({
|
|
source: new OSM()
|
|
})
|
|
],
|
|
target: 'map',
|
|
view: new View({
|
|
center: [0, 0],
|
|
zoom: 2
|
|
})
|
|
});
|
|
|
|
var imageStyle = new _ol_style_Style_({
|
|
image: new _ol_style_Circle_({
|
|
radius: 5,
|
|
snapToPixel: false,
|
|
fill: new _ol_style_Fill_({color: 'yellow'}),
|
|
stroke: new _ol_style_Stroke_({color: 'red', width: 1})
|
|
})
|
|
});
|
|
|
|
var headInnerImageStyle = new _ol_style_Style_({
|
|
image: new _ol_style_Circle_({
|
|
radius: 2,
|
|
snapToPixel: false,
|
|
fill: new _ol_style_Fill_({color: 'blue'})
|
|
})
|
|
});
|
|
|
|
var headOuterImageStyle = new _ol_style_Style_({
|
|
image: new _ol_style_Circle_({
|
|
radius: 5,
|
|
snapToPixel: false,
|
|
fill: new _ol_style_Fill_({color: 'black'})
|
|
})
|
|
});
|
|
|
|
var n = 200;
|
|
var omegaTheta = 30000; // Rotation period in ms
|
|
var R = 7e6;
|
|
var r = 2e6;
|
|
var p = 2e6;
|
|
map.on('postcompose', function(event) {
|
|
var vectorContext = event.vectorContext;
|
|
var frameState = event.frameState;
|
|
var theta = 2 * Math.PI * frameState.time / omegaTheta;
|
|
var coordinates = [];
|
|
var i;
|
|
for (i = 0; i < n; ++i) {
|
|
var t = theta + 2 * Math.PI * i / n;
|
|
var x = (R + r) * Math.cos(t) + p * Math.cos((R + r) * t / r);
|
|
var y = (R + r) * Math.sin(t) + p * Math.sin((R + r) * t / r);
|
|
coordinates.push([x, y]);
|
|
}
|
|
vectorContext.setStyle(imageStyle);
|
|
vectorContext.drawGeometry(new MultiPoint(coordinates));
|
|
|
|
var headPoint = new Point(coordinates[coordinates.length - 1]);
|
|
|
|
vectorContext.setStyle(headOuterImageStyle);
|
|
vectorContext.drawGeometry(headPoint);
|
|
|
|
vectorContext.setStyle(headInnerImageStyle);
|
|
vectorContext.drawGeometry(headPoint);
|
|
|
|
map.render();
|
|
});
|
|
map.render();
|