#include "heightmap.h"

grbl::heightmap grbl::heightmap::from_params(float from_x, float from_y, float to_x, float to_y, float resolution) {
    heightmap result{};

    result.from_x = from_x;
    result.from_y = from_y;
    result.to_x = to_x;
    result.to_y = to_y;
    result.resolution = resolution;

    result.x_segments = static_cast<size_t>(ceilf((to_x - from_x) / resolution));
    result.y_segments = static_cast<size_t>(ceilf((to_y - from_y) / resolution));

    float y_pos = from_y;
    for (int y = 0; y < (result.y_segments + 1); y++) {
        float x_pos = from_x;
        for (int x = 0; x < (result.x_segments + 1); x++) {
            // add a bit of random wobble to make it visible [-10, +10]
//            float z = ((rand() / (float) RAND_MAX) - 0.5f) * 2.0f * 1.0f;
            float z = 0.0f;
            result.vertices.emplace_back(x_pos, y_pos, z);
            x_pos += resolution;
        }
        y_pos += resolution;
    }

    return result;
}