ccore/src/Box.c

#include "core/Box.h"

#include "core/Generic.h"
#include "core/ToString.h"

void setBox(Box* box, const Vector3* size) {
    for(size_t i = 0; i < 3; i++) {
        if(size->data[i] < 0.0f) {
            box->min.data[i] = size->data[i];
            box->max.data[i] = 0.0f;
        } else {
            box->min.data[i] = 0.0f;
            box->max.data[i] = size->data[i];
        }
    }
}

void offsetBox(Box* box, const Vector3* offset) {
    addSet(&box->min, offset);
    addSet(&box->max, offset);
}

bool collidesWithBox(const Box* box, const Box* other) {
    return box->max.x > other->min.x && box->min.x < other->max.x &&
           box->max.y > other->min.y && box->min.y < other->max.y &&
           box->max.z > other->min.z && box->min.z < other->max.z;
}

void expandBox(Box* box, const Vector3* offset) {
    for(size_t i = 0; i < 3; i++) {
        box->v[offset->data[i] > 0.0f].data[i] += offset->data[i];
    }
}

void growBox(Box* box, const Vector3* growth) {
    Vector3 half;
    mul(&half, growth, 0.5f);
    Vector3 nMin;
    sub(&nMin, &box->min, &half);
    Vector3 nMax;
    add(&nMax, &box->max, &half);
    for(size_t i = 0; i < 3; i++) {
        if(nMin.data[i] > nMax.data[i]) {
            nMin.data[i] = (box->min.data[i] + box->max.data[i]) * 0.5f;
            nMax.data[i] = nMin.data[i];
        }
    }
    box->min = nMin;
    box->max = nMax;
}

size_t toStringBox(const Box* box, char* buffer, size_t n) {
    return toString(
        buffer, n, "Box([%.3f, %.3f, %.3f], [%.3f, %.3f, %.3f])",
        (double)box->min.x, (double)box->min.y, (double)box->min.z,
        (double)box->max.x, (double)box->max.y, (double)box->max.z);
}