7강 실습 답

lec7_practice.cs

using System;
					
public class Program
{
	class Vector2
	{
		public float X;
		public float Y;
		
		public Vector2(float X, float Y)
		{
			this.X = X;
			this.Y = Y;
		}
	}
	
	class Line
	{
		public float A;
		public float B;
		
		public Line(float A, float B)
		{
			this.A = A;
			this.B = B;
		}
		
		public bool IsBelowPoint(Vector2 p)
		{
			return p.Y > A * p.X + B;
		}
		
		public bool IntersectsWith(Line line)
		{
			return A != line.A;
		}
		
		public Vector2 FindIntersection(Line line)
		{
			float x = -(line.B - B) / (line.A - A);
			return new Vector2(x, A*x + B);
		}
	}
	public static void Main()
	{
		Line lineA = new Line(1, 2);
		Line lineB = new Line(2, -1);
		
		Vector2 pointA = new Vector2(0, 0);
		Console.WriteLine($"lineA is below (0, 0): {lineA.IsBelowPoint(pointA)}");
		
		Vector2 pointB = new Vector2(1, 3);
		Console.WriteLine($"lineB is below (1, 3): {lineB.IsBelowPoint(pointB)}");
		
		if (lineA.IntersectsWith(lineB))
		{
			Console.WriteLine("lineA intersects with lineB");
			Vector2 p = lineA.FindIntersection(lineB);
			Console.Write($"Intersection: ({p.X}, {p.Y})");
		}
		else
		{
			Console.WriteLine("lineA doesn't intersect with lineB");
		}
	}
}