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POHow to make line animation smoother?
 

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  1. POHow to make line animation smoother?
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    <p>I am making a simple animation in Java and I am trying to make it as smooth as possible.</p> <p>I use only *.Double inner classes of each Shape object and I set antialiasing in the Graphics2D objects on. It all works as long as I use only the fill() method but if I also use draw() method to draw lines around the same Shape the animation of these lines is choppy - pixel by pixel.</p> <p>Each of my rectangles on the canvas has this method to paint itself. It is moved every 20ms and the whole canvas is repainted using Timer and TimerListener.</p> <pre><code>import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class AnimationTest { public static void main(String[] args) { JFrame frm = new JFrame("Test"); frm.setBounds(200, 200, 400, 400); frm.setResizable(false); frm.setLocationRelativeTo(null); AnimationCanvas a = new AnimationCanvas(); frm.add(a); frm.setVisible(true); a.startAnimation(); } } class AnimationCanvas extends JPanel { SimpleSquare[] squares = new SimpleSquare[2]; AnimationCanvas() { squares[0] = new SimpleSquare(50, 80, true); squares[1] = new SimpleSquare(160, 80, false); } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); for (SimpleSquare c : squares) { c.paintSquare(g); } } Timer t; public void startAnimation() { t = new Timer(30, new Animator()); t.start(); } private class Animator implements ActionListener { @Override public void actionPerformed(ActionEvent e) { squares[0].y += 0.10; squares[1].y += 0.10; repaint(); } } } class SimpleSquare { double x; double y; Color color = Color.black; boolean fill; SimpleSquare(double x, double y, boolean fill) { this.x = x; this.y = y; this.fill = fill; } void paintSquare(Graphics g) { ((Graphics2D) g).setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); Shape s = new Rectangle.Double(x, y, 100, 100); g.setColor(color); ((Graphics2D) g).setStroke(new BasicStroke(2)); if (fill) { ((Graphics2D) g).fill(s); } else { ((Graphics2D) g).draw(s); } } } </code></pre> <p>Is there any way to fix this problem? I looked around for quite a while.</p>
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