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Polyspiral: Difference between revisions
→{{header|Java}}: added Java
(created Polyspiral draft task) |
(→{{header|Java}}: added Java) |
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If animation is not practical in your programming environment, you may show 3 frames from different stages of the animation instead.
=={{header|Java}}==
{{works with|Java|8}}
<lang java>import java.awt.*;
import java.awt.event.ActionEvent;
import javax.swing.*;
public class PolySpiral extends JPanel {
double inc = 0;
public PolySpiral() {
setPreferredSize(new Dimension(640, 640));
setBackground(Color.white);
new Timer(40, (ActionEvent e) -> {
inc = (inc + 0.05) % 360;
repaint();
}).start();
}
void drawSpiral(Graphics2D g, int len, double angleIncrement) {
double x1 = getWidth() / 2;
double y1 = getHeight() / 2;
double angle = angleIncrement;
for (int i = 0; i < 150; i++) {
g.setColor(Color.getHSBColor(i / 150f, 1.0f, 1.0f));
double x2 = x1 + Math.cos(angle) * len;
double y2 = y1 - Math.sin(angle) * len;
g.drawLine((int) x1, (int) y1, (int) x2, (int) y2);
x1 = x2;
y1 = y2;
len += 3;
angle = (angle + angleIncrement) % (Math.PI * 2);
}
}
@Override
public void paintComponent(Graphics gg) {
super.paintComponent(gg);
Graphics2D g = (Graphics2D) gg;
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
drawSpiral(g, 5, Math.toRadians(inc));
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setTitle("PolySpiral");
f.setResizable(true);
f.add(new PolySpiral(), BorderLayout.CENTER);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
});
}
}</lang>
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