4jcraft/Minecraft.World/Util/BoundingBox.cpp

#include "../Platform/stdafx.h"
#include "BoundingBox.h"
#include "Direction.h"
#include "JavaMath.h"

BoundingBox::BoundingBox() {
    // 4J added initialisers
    x0 = 0;
    y0 = 0;
    z0 = 0;
    x1 = 0;
    y1 = 0;
    z1 = 0;
}

BoundingBox* BoundingBox::getUnknownBox() {
    return new BoundingBox(INT_MAX, INT_MAX, INT_MAX, INT_MIN, INT_MIN,
                           INT_MIN);
}

BoundingBox* BoundingBox::orientBox(int footX, int footY, int footZ, int offX,
                                    int offY, int offZ, int width, int height,
                                    int depth, int orientation) {
    switch (orientation) {
        default:
            return new BoundingBox(footX + offX, footY + offY, footZ + offZ,
                                   footX + width - 1 + offX,
                                   footY + height - 1 + offY,
                                   footZ + depth - 1 + offZ);
        case Direction::NORTH:
            // foot is at x0, y0, z1
            return new BoundingBox(footX + offX, footY + offY,
                                   footZ - depth + 1 + offZ,
                                   footX + width - 1 + offX,
                                   footY + height - 1 + offY, footZ + offZ);
        case Direction::SOUTH:
            // foot is at x0, y0, z0
            return new BoundingBox(footX + offX, footY + offY, footZ + offZ,
                                   footX + width - 1 + offX,
                                   footY + height - 1 + offY,
                                   footZ + depth - 1 + offZ);
        case Direction::WEST:
            // foot is at x1, y0, z0, but width and depth are flipped
            return new BoundingBox(footX - depth + 1 + offZ, footY + offY,
                                   footZ + offX, footX + offZ,
                                   footY + height - 1 + offY,
                                   footZ + width - 1 + offX);
        case Direction::EAST:
            // foot is at x0, y0, z0, but width and depth are flipped
            return new BoundingBox(footX + offZ, footY + offY, footZ + offX,
                                   footX + depth - 1 + offZ,
                                   footY + height - 1 + offY,
                                   footZ + width - 1 + offX);
    }
}

BoundingBox::BoundingBox(BoundingBox* other) {
    this->x0 = other->x0;
    this->y0 = other->y0;
    this->z0 = other->z0;
    this->x1 = other->x1;
    this->y1 = other->y1;
    this->z1 = other->z1;
}

BoundingBox::BoundingBox(int x0, int y0, int z0, int x1, int y1, int z1) {
    this->x0 = x0;
    this->y0 = y0;
    this->z0 = z0;
    this->x1 = x1;
    this->y1 = y1;
    this->z1 = z1;
}

BoundingBox::BoundingBox(int x0, int z0, int x1, int z1) {
    this->x0 = x0;
    this->z0 = z0;
    this->x1 = x1;
    this->z1 = z1;

    // the bounding box for this constructor is limited to world size,
    // excluding bedrock level
    this->y0 = 1;
    this->y1 = 512;
}

bool BoundingBox::intersects(BoundingBox* other) {
    return !(this->x1 < other->x0 || this->x0 > other->x1 ||
             this->z1 < other->z0 || this->z0 > other->z1 ||
             this->y1 < other->y0 || this->y0 > other->y1);
}

bool BoundingBox::intersects(int x0, int y0, int z0, int x1, int y1, int z1) {
    return !(this->x1 < x0 || this->x0 > x1 || this->z1 < z0 || this->z0 > z1 ||
             this->y1 < y0 || this->y0 > y1);
}

bool BoundingBox::intersects(int x0, int z0, int x1, int z1) {
    return !(this->x1 < x0 || this->x0 > x1 || this->z1 < z0 || this->z0 > z1);
}

void BoundingBox::expand(BoundingBox* other) {
    this->x0 = Math::_min(this->x0, other->x0);
    this->y0 = Math::_min(this->y0, other->y0);
    this->z0 = Math::_min(this->z0, other->z0);
    this->x1 = Math::_max(this->x1, other->x1);
    this->y1 = Math::_max(this->y1, other->y1);
    this->z1 = Math::_max(this->z1, other->z1);
}

BoundingBox* BoundingBox::getIntersection(BoundingBox* other) {
    if (!intersects(other)) {
        return NULL;
    }
    BoundingBox* result = new BoundingBox();
    result->x0 = Math::_max(this->x0, other->x0);
    result->y0 = Math::_max(this->y0, other->y0);
    result->z0 = Math::_max(this->z0, other->z0);
    result->x1 = Math::_min(this->x1, other->x1);
    result->y1 = Math::_min(this->y1, other->y1);
    result->z1 = Math::_min(this->z1, other->z1);

    return result;
}

void BoundingBox::move(int dx, int dy, int dz) {
    x0 += dx;
    y0 += dy;
    z0 += dz;
    x1 += dx;
    y1 += dy;
    z1 += dz;
}

bool BoundingBox::isInside(int x, int y, int z) {
    return (x >= x0 && x <= x1 && z >= z0 && z <= z1 && y >= y0 && y <= y1);
}

int BoundingBox::getXSpan() { return x1 - x0 + 1; }

int BoundingBox::getYSpan() { return y1 - y0 + 1; }

int BoundingBox::getZSpan() { return z1 - z0 + 1; }

int BoundingBox::getXCenter() { return x0 + (x1 - x0 + 1) / 2; }

int BoundingBox::getYCenter() { return y0 + (y1 - y0 + 1) / 2; }

int BoundingBox::getZCenter() { return z0 + (z1 - z0 + 1) / 2; }

std::wstring BoundingBox::toString() {
    return L"(" + _toString<int>(x0) + L", " + _toString<int>(y0) + L", " +
           _toString<int>(z0) + L"; " + _toString<int>(x1) + L", " +
           _toString<int>(y1) + L", " + _toString<int>(z1) + L")";
}