b23_zuma/assets/script/collision/Shape.ts

/** @format */

import {obbIntersect, sphereAABBDistance, sphereOBBDistance} from './AILib'
import {cBody} from './Body'

const Vec3 = cc.Vec3

export enum ShapeType {
    Box = 1,
    Sphere = 2,
    Capsule = 4, //AI TODO
}

export abstract class cShape {
    radius = 0
    height = 0
    type = ShapeType.Box
    size = {x: 0, y: 0, z: 0}
    // scale = { x: 1, y: 1, z: 1 };
    center = {x: 0, y: 0, z: 0}
    // halfSize = { x: 0, y: 0, z: 0 };
    aabb: Array<number> = [0, 0, 0, 0, 0, 0]

    constructor(center: cc.Vec3, type: ShapeType) {
        this.type = type
        //this.isDirty = true;
        this.center.x = center.x
        this.center.y = center.y
        this.center.z = center.z
    }

    updateAABB(scale: cc.Vec3, world: cc.Mat3, isIdentity: boolean = true) {
        const size = this.size
        const center = this.center
        const sx = scale.x,
            sy = scale.y,
            sz = scale.z
        const cx = center.x,
            cy = center.y,
            cz = center.z
        let x = size.x * 0.5,
            y = size.y * 0.5,
            z = size.z * 0.5

        const aabb = this.aabb
        if (!isIdentity) {
            const m = world.m
            const uX = m[0] * sx,
                uY = m[1] * sx,
                uZ = m[2] * sx
            const vX = m[3] * sy,
                vY = m[4] * sy,
                vZ = m[5] * sy
            const wX = m[6] * sz,
                wY = m[7] * sz,
                wZ = m[8] * sz

            const cX = uX * cx + vX * cy + wX * cz
            const cY = uY * cx + vY * cy + wY * cz
            const cZ = uZ * cx + vZ * cy + wZ * cz

            const absU = Math.abs(uX) * x + Math.abs(vX) * y + Math.abs(wX) * z
            const absV = Math.abs(uY) * x + Math.abs(vY) * y + Math.abs(wY) * z
            const absW = Math.abs(uZ) * x + Math.abs(vZ) * y + Math.abs(wZ) * z

            ;(aabb[0] = cX - absU), (aabb[1] = cY - absV), (aabb[2] = cZ - absW)
            ;(aabb[3] = cX + absU), (aabb[4] = cY + absV), (aabb[5] = cZ + absW)
        } else {
            x = Math.abs(x * sx)
            y = Math.abs(y * sy)
            z = Math.abs(z * sz)

            aabb[0] = cx * sx - x
            aabb[1] = cy * sy - y
            aabb[2] = cz * sz - z

            aabb[3] = cx * sx + x
            aabb[4] = cy * sy + y
            aabb[5] = cz * sz + z
        }

        return aabb
    }
}

export class cBox extends cShape {
    constructor(center: cc.Vec3, size: cc.Vec3) {
        super(center, ShapeType.Box)

        this.size.x = size.x
        this.size.y = size.y
        this.size.z = size.z
    }
}

export class cSphere extends cShape {
    constructor(center: cc.Vec3, radius: number) {
        super(center, ShapeType.Sphere)
        this.radius = radius

        this.size.x = radius * 2
        this.size.y = radius * 2
        this.size.z = radius * 2
    }
}

//默认y轴竖向
export class cCapsule extends cShape {
    constructor(center: cc.Vec3, radius: number, height: number) {
        super(center, ShapeType.Capsule)
        this.radius = radius
        this.height = height

        this.size.x = radius * 2
        this.size.y = height * 2
        this.size.z = radius * 2
    }
}

const center = new cc.Vec3()

export const ShapeSupport: Array<(a: cBody, b: cBody) => boolean> = []

ShapeSupport[ShapeType.Box | ShapeType.Box] = function (a: cBody, b: cBody) {
    //a,b 没有旋转,已进行AABB处理 , 直接返回 true
    if (a.isIdentity && b.isIdentity) return true

    return obbIntersect(a.getCenter(), a.getHalfSize(), a.getRotMat3(), b.getCenter(), b.getHalfSize(), b.getRotMat3())
}

ShapeSupport[ShapeType.Box | ShapeType.Sphere] = function (a: cBody, b: cBody) {
    //a没有旋转当AABB处理
    if (a.isIdentity) {
        // 转换到 aabb 坐标系下
        Vec3.subtract(center, b.getCenter(), a.getCenter())
        return sphereAABBDistance(center, b.getRaidus(), a.getHalfSize())
    }

    return sphereOBBDistance(b.getCenter(), b.getRaidus(), a.getCenter(), a.getRotation(), a.getHalfSize())
}

ShapeSupport[ShapeType.Sphere | ShapeType.Sphere] = function (a: cBody, b: cBody) {
    let ca = a.getCenter()
    let cb = b.getCenter()
    Vec3.subtract(center, ca, cb)
    let lengthSqr = center.lengthSqr()
    let radii = a.getRaidus() + b.getRaidus()

    return lengthSqr <= radii * radii
}

ShapeSupport[ShapeType.Box | ShapeType.Capsule] = function (a: cBody, b: cBody) {
    //AI TODO
    return true
}

ShapeSupport[ShapeType.Sphere | ShapeType.Capsule] = function (a: cBody, b: cBody) {
    //AI TODO
    return true
}

ShapeSupport[ShapeType.Capsule | ShapeType.Capsule] = function (a: cBody, b: cBody) {
    //AI TODO
    return true
}