【GIS】Cesium-特殊形状

var viewer = new Cesium.Viewer("cesiumContainer");

function computeCircle(radius) {
  var positions = [];
  for (var i = 0; i < 360; i++) {
    var radians = Cesium.Math.toRadians(i);
    positions.push(
      new Cesium.Cartesian2(
        radius * Math.cos(radians),
        radius * Math.sin(radians)
      )
    );
  }
  return positions;
}

function computeStar(arms, rOuter, rInner) {
  var angle = Math.PI / arms;
  var length = 2 * arms;
  var positions = new Array(length);
  for (var i = 0; i < length; i++) {
    var r = i % 2 === 0 ? rOuter : rInner;
    positions[i] = new Cesium.Cartesian2(
      Math.cos(i * angle) * r,
      Math.sin(i * angle) * r
    );
  }
  return positions;
}

var redTube = viewer.entities.add({
  name: "Red tube with rounded corners",
  polylineVolume: {
    positions: Cesium.Cartesian3.fromDegreesArray([
      -85.0,
      32.0,
      -85.0,
      36.0,
      -89.0,
      36.0,
    ]),
    shape: computeCircle(60000.0),
    material: Cesium.Color.RED,
  },
});

var greenBox = viewer.entities.add({
  name: "Green box with beveled corners and outline",
  polylineVolume: {
    positions: Cesium.Cartesian3.fromDegreesArrayHeights([
      -90.0,
      32.0,
      0.0,
      -90.0,
      36.0,
      100000.0,
      -94.0,
      36.0,
      0.0,
    ]),
    shape: [
      new Cesium.Cartesian2(-50000, -50000),
      new Cesium.Cartesian2(50000, -50000),
      new Cesium.Cartesian2(50000, 50000),
      new Cesium.Cartesian2(-50000, 50000),
    ],
    cornerType: Cesium.CornerType.BEVELED,
    material: Cesium.Color.GREEN.withAlpha(0.5),
    outline: true,
    outlineColor: Cesium.Color.BLACK,
  },
});

var blueStar = viewer.entities.add({
  name: "Blue star with mitered corners and outline",
  polylineVolume: {
    positions: Cesium.Cartesian3.fromDegreesArrayHeights([
      -95.0,
      32.0,
      0.0,
      -95.0,
      36.0,
      100000.0,
      -99.0,
      36.0,
      200000.0,
    ]),
    shape: computeStar(7, 70000, 50000),
    cornerType: Cesium.CornerType.MITERED,
    material: Cesium.Color.BLUE,
  },
});

viewer.zoomTo(viewer.entities);