mul-agent-virtual-simulation-system/train-web/demo/lmm/objects/ObjectUtils.ts

import { Scene } from '../core/Scene'
import { Matrix3 } from '../math/Matrix3'
import { Vector2 } from '../math/Vector2'
import { Object2D } from './Object2D'

/* 基于矩阵创建路径 */
function crtPathByMatrix(
  ctx: CanvasRenderingContext2D,
  vertices: number[],
  matrix: Matrix3,
  closePath = false
) {
  const p0 = new Vector2(vertices[0], vertices[1]).applyMatrix3(matrix)
  ctx.moveTo(p0.x, p0.y)
  // console.log(p0)

  for (let i = 2, len = vertices.length; i < len; i += 2) {
    const pn = new Vector2(vertices[i], vertices[i + 1]).applyMatrix3(matrix)
    ctx.lineTo(pn.x, pn.y)
  }
  closePath && ctx.closePath()
}

/* 创建路径 */
function crtPath(
  ctx: CanvasRenderingContext2D,
  vertices: number[],
  closePath = false
) {
  const p0 = new Vector2(vertices[0], vertices[1])
  ctx.moveTo(p0.x, p0.y)
  for (let i = 2, len = vertices.length; i < len; i += 2) {
    const pn = new Vector2(vertices[i], vertices[i + 1])
    ctx.lineTo(pn.x, pn.y)
  }
  closePath && ctx.closePath()
}

/* 加载图像的Promise对象 */
function ImagePromise(image: HTMLImageElement) {
  return new Promise<HTMLImageElement>((resolve) => {
    image.onload = () => {
      resolve(image)
    }
  })
}

/* 图像的批量加载 */
function ImagePromises(images: HTMLImageElement[]) {
  return images.map((image) => ImagePromise(image))
}

/* 选择图案 */
function SelectObj(scene: Scene) {
  return function (objGroup: Object2D[], mp: Vector2): Object2D | null {
    for (let obj of [...objGroup].reverse()) {
      if (scene.isPointInObj(obj, mp, obj.pvmMatrix)) {
        return obj
      }
    }
    return null
  }
}

export { crtPath, crtPathByMatrix, ImagePromise, ImagePromises, SelectObj }