ccore/src/Box.c

#include "core/Box.h"

#include <stdio.h>

CoreBox* coreSetBox(CoreBox* box, const CoreVector3* 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];
        }
    }
    return box;
}

CoreBox* coreOffsetBox(CoreBox* box, const CoreVector3* offset) {
    coreAddSetV3(&box->min, offset);
    coreAddSetV3(&box->max, offset);
    return box;
}

bool coreCollidesWithBox(const CoreBox* box, const CoreBox* other) {
    return box->max.data[0] > other->min.data[0] &&
           box->min.data[0] < other->max.data[0] &&
           box->max.data[1] > other->min.data[1] &&
           box->min.data[1] < other->max.data[1] &&
           box->max.data[2] > other->min.data[2] &&
           box->min.data[2] < other->max.data[2];
}

CoreBox* coreExpandBox(CoreBox* box, const CoreVector3* offset) {
    for(size_t i = 0; i < 3; i++) {
        if(offset->data[i] > 0.0f) {
            box->max.data[i] += offset->data[i];
        } else {
            box->min.data[i] += offset->data[i];
        }
    }
    return box;
}

CoreBox* coreGrowBox(CoreBox* box, const CoreVector3* growth) {
    CoreVector3 half = {0};
    coreMulV3F(&half, growth, 0.5f);
    CoreVector3 nMin = {0};
    coreSubV3(&nMin, &box->min, &half);
    CoreVector3 nMax = {0};
    coreAddV3(&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;
    return box;
}

size_t coreToStringBox(const CoreBox* box, char* buffer, size_t n) {
    int w = snprintf(buffer, n, "Box([%.3f, %.3f, %.3f], [%.3f, %.3f, %.3f])",
                     (double)box->min.data[0], (double)box->min.data[1],
                     (double)box->min.data[2], (double)box->min.data[3],
                     (double)box->min.data[4], (double)box->min.data[5]);
    return w < 0 ? 0 : (size_t)w;
}