traingle.java

用于简单的图形的程序

import java.util.Scanner;

public class traingle extends graph {
	traingle() {
		System.out
				.println("Please input offset about x & y:(notice: 以前两点构成的直线需存在斜率且不为0)");
		Scanner in1 = new Scanner(System.in);
		Scanner in2 = new Scanner(System.in);
		Scanner in3 = new Scanner(System.in);
		Scanner in4 = new Scanner(System.in);
		Scanner in5 = new Scanner(System.in);
		Scanner in6 = new Scanner(System.in);
		double x, y, x1, y1, x2, y2;
		x = in1.nextDouble();
		y = in2.nextDouble();
		x1 = in3.nextDouble();
		y1 = in4.nextDouble();
		x2 = in5.nextDouble();
		y2 = in6.nextDouble();
		System.out.println("construct completed");
		System.out.println("This traingle info is:");
		this.x0 = (x + x1 + x2) / 3;
		this.y0 = (y + y1 + y2) / 3;
		System.out.print("Area is: ");
		mularea s = new mularea();
		double l, h;
		l = 0.5 * Math.hypot(x - x1, y - y1);
		double a = (y - y1) / (x - x1);
		double b = (x * y1 - x1 * y) / (x - x1);
		h = Math.abs(a * x2 + b - y2) / Math.hypot(a, b);

		System.out.println(s.area(l, h));
		System.out.print("Girth is: ");
		mulgirth c = new mulgirth();
		System.out.println(c.girth(x, y, x1, y1, x2, y2));

	}
}