Plotar gráfico

private void drawCos(Graphics2D g2D) {

		g2D.drawString("Sine Wave", 250, 10); // Draw some text
		g2D.drawString(" 100", 15, 95); // Draw some text
		g2D.drawString(" 0", 15, 205); // Draw some text
		g2D.drawString("-100", 15, 305); // Draw some text

		g2D.drawLine(40, 200, 460, 200);

		int old_x = 50;
		int old_y = 50;
		int new_x = 50;
		int new_y = 300;

		for (int i = 1; i <= 100; i++) {

			old_x = new_x;
			old_y = new_y;

			new_x += 4;

			new_y = (int) (((Math.cos(((2 * Math.PI) / 100.0) * i)) * -100) + 200.0);

			System.out.println("From: " + old_x + ", " + old_y + " To: "
					+ new_x + ", " + new_y);

			g2D.drawLine(old_x, old_y, new_x, new_y );
		}

	}

	private void drawSin(Graphics2D g2D) {

		g2D.drawString("Sine Wave", 250, 10); // Draw some text
		g2D.drawString(" 100", 15, 95); // Draw some text
		g2D.drawString(" 0", 15, 205); // Draw some text
		g2D.drawString("-100", 15, 305); // Draw some text

		g2D.drawLine(40, 200, 460, 200);

		int old_x = 50;
		int old_y = 200;
		int new_x = 50;
		int new_y = 200;

		for (int i = 1; i <= 100; i++) {

			old_x = new_x;
			old_y = new_y;

			new_x += 4;

			new_y = (int) (((Math.sin(((2 * Math.PI) / 100.0) * i)) * -100) + 200.0);

			System.out.println("From: " + old_x + ", " + old_y + " To: "
					+ new_x + ", " + new_y);

			g2D.drawLine(old_x, old_y, new_x, new_y);
		}
	}
	
	private void drawTan(Graphics2D g2D){
	
		g2D.drawString("Sine Wave", 250, 10); // Draw some text
		g2D.drawString(" 100", 15, 95); // Draw some text
		g2D.drawString(" 0", 15, 205); // Draw some text
		g2D.drawString("-100", 15, 305); // Draw some text

		g2D.drawLine(40, 200, 460, 200);
		g2D.drawLine(50, 50, 50, 350);

		int old_x = 50;
		int old_y = 200;
		int new_x = 50;
		int new_y = 200;

		for (int i = 1; i <= 100; i++) {

			old_x = new_x;
			old_y = new_y;

			new_x += 4;

			new_y = (int) (((Math.tan(((2 * Math.PI) / 100.0) * i)) * -10) + 200.0);

			System.out.println("From: " + old_x + ", " + old_y + " To: "
					+ new_x + ", " + new_y);

			g2D.drawLine(old_x, old_y, new_x, new_y);
		}
	
	}