#include "Grid.h"

#include <cmath>

#include <raylib.h>

#include <kurator/engine/Camera.h>


namespace kurator
{


constexpr Color GRID {0x11, 0x11, 0x11, 0xff};
constexpr Color CENTER {0x31, 0x31, 0x31, 0xff};


void
Grid::draw(const engine::Camera& camera) const
{
	constexpr double step = 1000.0;
	auto start = camera.top_left();
	start.x = std::round(start.x / step) * step;
	start.y = std::round(start.y / step) * step;
	const auto end = camera.bottom_right();
	auto point = start;
	while (point.x < end.x || point.y < end.y) {
		const auto projected = camera.to_screen(point);
		DrawLine(projected.x, 0, projected.x, GetScreenHeight(), GRID);
		DrawLine(0, projected.y, GetScreenWidth(), projected.y, GRID);
		point.x += step;
		point.y += step;
	}
	const auto center = camera.to_screen({0.0, 0.0});
	DrawLine(center.x, 0, center.x, GetScreenHeight(), CENTER);
	DrawLine(0, center.y, GetScreenWidth(), center.y, CENTER);
}


}  // namespace kurator