package net.minecraft.gizmos;

import net.minecraft.world.phys.Vec3;

public record CircleGizmo(Vec3 pos, float radius, GizmoStyle style) implements Gizmo {
	private static final int CIRCLE_VERTICES = 20;
	private static final float SEGMENT_SIZE_RADIANS = (float) (Math.PI / 10);

	@Override
	public void emit(final GizmoPrimitives primitives, final float alphaMultiplier) {
		if (this.style.hasStroke() || this.style.hasFill()) {
			Vec3[] points = new Vec3[21];

			for (int i = 0; i < 20; i++) {
				float theta = i * (float) (Math.PI / 10);
				Vec3 point = this.pos.add((float)(this.radius * Math.cos(theta)), 0.0, (float)(this.radius * Math.sin(theta)));
				points[i] = point;
			}

			points[20] = points[0];
			if (this.style.hasFill()) {
				int color = this.style.multipliedFill(alphaMultiplier);
				primitives.addTriangleFan(points, color);
			}

			if (this.style.hasStroke()) {
				int color = this.style.multipliedStroke(alphaMultiplier);

				for (int i = 0; i < 20; i++) {
					primitives.addLine(points[i], points[i + 1], color, this.style.strokeWidth());
				}
			}
		}
	}
}