Antialias function plotting test

AATest.java

package com.tungd;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.Line2D;
import java.awt.geom.QuadCurve2D;
import javax.swing.JFrame;
import javax.swing.JPanel;

/**
 *
 * @author tung
 */
public class Grapher {

	/**
	 * @param args the command line arguments
	 */
	public static void main(String[] args) {
		JFrame mainFrame = new JFrame("ax^2 + bx + c");

		mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		GraphCanvas canvas = new GraphCanvas();
		mainFrame.add(canvas);
		mainFrame.setSize(600, 400);
		mainFrame.setVisible(true);
	}
}

class GraphCanvas extends JPanel {

	public static double A = 0.02;
	public static double B = 0;
	public static double C = 0;

	@Override
	public void paintComponent(Graphics g) {
		super.paintComponent(g);

		this.setBackground(Color.WHITE);

		int w = getWidth();
		int h = getHeight();

		// Kind of addicted to HTML5 canvas.getContext()
		Graphics2D ctx = (Graphics2D) g;

		// Getting to the standard coordinates
		ctx.translate(w / 2, h / 2);
		ctx.rotate(Math.PI);

		// AA: F Why This Not On By Default
		ctx.addRenderingHints(new RenderingHints(RenderingHints.KEY_ANTIALIASING,
				RenderingHints.VALUE_ANTIALIAS_ON));

		// Draw our graph using line segments
		ctx.setColor(Color.RED);
		ctx.setStroke(new BasicStroke(2f));

		int pX = -w / 2;
		double pY = y(pX);
		for (int x = -w / 2; x < w / 2; x += 1) {
			ctx.draw(new Line2D.Double(pX, pY, x, y(x)));
			pX = x;
			pY = y(x);
		}

		// Draw our graph using QuadraticCurve
		ctx.setColor(Color.BLUE);
		ctx.draw(new QuadCurve2D.Double((double) w / 4, (double) h / 2,
				(double) 0, (double) -h/2,
				(double) -w/4, (double) h/2));
	}

	public double y(int x) {
		return A * x * x + B * x + C;
	}
}