surface Namespace Reference

Classes
struct	Point
struct	SurfaceDeleter
class	SurfaceWindow

Functions
std::array< Point, 10 >	create_star_points (float center_x, float center_y, float outer_radius, float inner_radius)
bool	point_in_star (float x, float y, const std::array< Point, 10 > &points)

Variables
constexpr float	PI = 3.14159265358979323846f

Function Documentation

create_star_points()

std::array< Point, 10 > surface::create_star_points	(	float	center_x,
		float	center_y,
		float	outer_radius,
		float	inner_radius )

Definition at line 21 of file surface.cpp.

                                                                                                                   {
        std::array<Point, 10> points{};
        constexpr float start_angle = -PI * 0.5f;
        constexpr float step = PI / 5.0f;
 
        for (std::size_t i = 0; i < points.size(); ++i) {
            const float radius = (i % 2U == 0U) ? outer_radius : inner_radius;
            const float angle = start_angle + static_cast<float>(i) * step;
            points[i] = {
                .x = center_x + std::cos(angle) * radius,
                .y = center_y + std::sin(angle) * radius,
            };
        }
        return points;
    }

point_in_star()

bool surface::point_in_star	(	float	x,
		float	y,
		const std::array< Point, 10 > &	points )

Definition at line 37 of file surface.cpp.

                                                                            {
        bool inside = false;
        for (std::size_t i = 0, j = points.size() - 1U; i < points.size(); j = i++) {
            const Point &a = points[i];
            const Point &b = points[j];
            if (((a.y > y) != (b.y > y)) && (x < (b.x - a.x) * (y - a.y) / (b.y - a.y) + a.x)) {
                inside = !inside;
            }
        }
        return inside;
    }

Variable Documentation

PI

float surface::PI = 3.14159265358979323846f

constexpr

Definition at line 19 of file surface.cpp.