[Java] 실습 DrawShapeExam

package object.Extends;

import javax.swing.JFrame;
import java.awt.Graphics;

//--------------------------------------------------------------------------
// public class DrawShapeExam
//--------------------------------------------------------------------------
public class DrawShapeExam extends JFrame{

	public static void main(String[] args) {
		DrawShapeExam win = new DrawShapeExam("도형 그리기");
		win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

	}
	
	public void paint(Graphics g) {
		Point[] p = {
			new Point(100, 100),
			new Point(140, 50),
			new Point(200, 100)
		};
		Triangle t =  new Triangle(p);
		Circle c = new Circle(new Point(150, 150), 50);
		
		// 원을 그린다.
		g.drawOval(c.center.x, c.center.y, c.r, c.r);
		
		// 직선 3개로 삼각형을 그린다.
		g.drawLine(t.p[0].x, t.p[0].y, t.p[1].x, t.p[1].y);
		g.drawLine(t.p[1].x, t.p[1].y, t.p[2].x, t.p[2].y);
		g.drawLine(t.p[2].x, t.p[2].y, t.p[0].x, t.p[0].y);
	}
	
	DrawShapeExam(String title) {
		super(title);
		setLocation(300, 200);
		setSize(500, 400);
		setVisible(true);
	}

} // End - public class DrawShapeExam
//--------------------------------------------------------------------------
// 좌표 클래스
//--------------------------------------------------------------------------
class Point {
	int x;
	int y;
	Point(int x, int y) { // 매개변수 있는 생성자
		this.x = x;
		this.y = y;
	}
	Point() { // 기본 생성자
		this(0, 0);
	}
} // End - class Point
//--------------------------------------------------------------------------
// 원 클래스
//--------------------------------------------------------------------------
class Circle {
	Point center; // 원의 원점좌표
	int r; // 반지름
	
	Circle() {
		this(new Point(0, 0), 100);
	}
	Circle(Point center, int r) {
		this.center = center;
		this.r = r;
	}
} // End - class Circle
//--------------------------------------------------------------------------
// 삼각형 클래스
//--------------------------------------------------------------------------
class Triangle {
	Point[] p = new Point[3];
	
	Triangle(Point[] p) {
		this.p = p;
	}
	Triangle(Point p1, Point p2, Point p3) {
		p[0] = p1;
		p[1] = p2;
		p[2] = p3;
	}
} // End - class Triangle