three-stdlib/lines/LineSegmentsGeometry.js

stand-alone library of threejs examples

import { InstancedBufferGeometry, Float32BufferAttribute, InstancedInterleavedBuffer, InterleavedBufferAttribute, WireframeGeometry, Box3, Sphere, Vector3 } from "three";
const _box = /* @__PURE__ */ new Box3();
const _vector = /* @__PURE__ */ new Vector3();
class LineSegmentsGeometry extends InstancedBufferGeometry {
  constructor() {
    super();
    this.isLineSegmentsGeometry = true;
    this.type = "LineSegmentsGeometry";
    const positions = [-1, 2, 0, 1, 2, 0, -1, 1, 0, 1, 1, 0, -1, 0, 0, 1, 0, 0, -1, -1, 0, 1, -1, 0];
    const uvs = [-1, 2, 1, 2, -1, 1, 1, 1, -1, -1, 1, -1, -1, -2, 1, -2];
    const index = [0, 2, 1, 2, 3, 1, 2, 4, 3, 4, 5, 3, 4, 6, 5, 6, 7, 5];
    this.setIndex(index);
    this.setAttribute("position", new Float32BufferAttribute(positions, 3));
    this.setAttribute("uv", new Float32BufferAttribute(uvs, 2));
  }
  applyMatrix4(matrix) {
    const start = this.attributes.instanceStart;
    const end = this.attributes.instanceEnd;
    if (start !== void 0) {
      start.applyMatrix4(matrix);
      end.applyMatrix4(matrix);
      start.needsUpdate = true;
    }
    if (this.boundingBox !== null) {
      this.computeBoundingBox();
    }
    if (this.boundingSphere !== null) {
      this.computeBoundingSphere();
    }
    return this;
  }
  setPositions(array) {
    let lineSegments;
    if (array instanceof Float32Array) {
      lineSegments = array;
    } else if (Array.isArray(array)) {
      lineSegments = new Float32Array(array);
    }
    const instanceBuffer = new InstancedInterleavedBuffer(lineSegments, 6, 1);
    this.setAttribute("instanceStart", new InterleavedBufferAttribute(instanceBuffer, 3, 0));
    this.setAttribute("instanceEnd", new InterleavedBufferAttribute(instanceBuffer, 3, 3));
    this.computeBoundingBox();
    this.computeBoundingSphere();
    return this;
  }
  setColors(array, itemSize = 3) {
    let colors;
    if (array instanceof Float32Array) {
      colors = array;
    } else if (Array.isArray(array)) {
      colors = new Float32Array(array);
    }
    const instanceColorBuffer = new InstancedInterleavedBuffer(colors, itemSize * 2, 1);
    this.setAttribute("instanceColorStart", new InterleavedBufferAttribute(instanceColorBuffer, itemSize, 0));
    this.setAttribute("instanceColorEnd", new InterleavedBufferAttribute(instanceColorBuffer, itemSize, itemSize));
    return this;
  }
  fromWireframeGeometry(geometry) {
    this.setPositions(geometry.attributes.position.array);
    return this;
  }
  fromEdgesGeometry(geometry) {
    this.setPositions(geometry.attributes.position.array);
    return this;
  }
  fromMesh(mesh) {
    this.fromWireframeGeometry(new WireframeGeometry(mesh.geometry));
    return this;
  }
  fromLineSegments(lineSegments) {
    const geometry = lineSegments.geometry;
    this.setPositions(geometry.attributes.position.array);
    return this;
  }
  computeBoundingBox() {
    if (this.boundingBox === null) {
      this.boundingBox = new Box3();
    }
    const start = this.attributes.instanceStart;
    const end = this.attributes.instanceEnd;
    if (start !== void 0 && end !== void 0) {
      this.boundingBox.setFromBufferAttribute(start);
      _box.setFromBufferAttribute(end);
      this.boundingBox.union(_box);
    }
  }
  computeBoundingSphere() {
    if (this.boundingSphere === null) {
      this.boundingSphere = new Sphere();
    }
    if (this.boundingBox === null) {
      this.computeBoundingBox();
    }
    const start = this.attributes.instanceStart;
    const end = this.attributes.instanceEnd;
    if (start !== void 0 && end !== void 0) {
      const center = this.boundingSphere.center;
      this.boundingBox.getCenter(center);
      let maxRadiusSq = 0;
      for (let i = 0, il = start.count; i < il; i++) {
        _vector.fromBufferAttribute(start, i);
        maxRadiusSq = Math.max(maxRadiusSq, center.distanceToSquared(_vector));
        _vector.fromBufferAttribute(end, i);
        maxRadiusSq = Math.max(maxRadiusSq, center.distanceToSquared(_vector));
      }
      this.boundingSphere.radius = Math.sqrt(maxRadiusSq);
      if (isNaN(this.boundingSphere.radius)) {
        console.error(
          "THREE.LineSegmentsGeometry.computeBoundingSphere(): Computed radius is NaN. The instanced position data is likely to have NaN values.",
          this
        );
      }
    }
  }
  toJSON() {
  }
  applyMatrix(matrix) {
    console.warn("THREE.LineSegmentsGeometry: applyMatrix() has been renamed to applyMatrix4().");
    return this.applyMatrix4(matrix);
  }
}
export {
  LineSegmentsGeometry
};
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