import java.awt.Color; import java.awt.Graphics; import javax.swing.BoundedRangeModel; /** * * @author zhouer */ public class Cycloid extends javax.swing.JApplet { final int minR = 0, maxR = 100; final int minr = -50, maxr = 50; final int mind = -50, maxd = 50; final int resolution = 3000; int R = 30; int r = 10; int d = 10; double scale = 2; /** Initializes the applet Curve */ // @Override public void init() { try { java.awt.EventQueue.invokeAndWait(new Runnable() { public void run() { initComponents(); } }); } catch (Exception ex) { ex.printStackTrace(); } } // @Override public void paint( Graphics g ) { super.paint(g); draw(); } public Color gradient( double g, Color start, Color end ) { int r1, g1, b1; int r2, g2, b2; int mr, mg, mb; r1 = start.getRed(); g1 = start.getGreen(); b1 = start.getBlue(); r2 = end.getRed(); g2 = end.getGreen(); b2 = end.getBlue(); mr = (int) (r1 + g * (r2 - r1)); mg = (int) (g1 + g * (g2 - g1)); mb = (int) (b1 + g * (b2 - b1)); return new Color(mr, mg, mb); } public int lcm( int x, int y) { x = Math.abs(x); y = Math.abs(y); return x * y / gcd(x, y); } public int gcd( int x, int y ) { x = Math.abs(x); y = Math.abs(y); while( (x != 0) && (y != 0) ) { if( x >= y ) { x %= y; } else { y %= x; } } return x + y; } public void draw() { int i, x1, y1, x2, y2; double angle, t; double[] theta = new double[resolution]; double[] x = new double[resolution]; double[] y = new double[resolution]; // angle = lcm( R, r ) / r * 2 * Math.PI; angle = R / gcd( R, r ) * 2 * Math.PI; for(i = 0; i < theta.length; i++) { theta[i] = angle * i / theta.length; t = -1 * r * theta[i] / R; x[i] = (R - r) * Math.cos( t ) + d * Math.cos( t + theta[i] ); y[i] = (R - r) * Math.sin( t ) + d * Math.sin( t + theta[i] ); } Graphics g = PlotPanel.getGraphics(); g.clearRect( 0, 0, PlotPanel.getWidth(), PlotPanel.getHeight() ); g.translate( PlotPanel.getWidth() / 2, PlotPanel.getHeight() / 2); for(i = 0; i < theta.length - 1; i++) { x1 = (int)(scale * x[i]); y1 = (int)(scale * y[i]); x2 = (int)(scale * x[i + 1]); y2 = (int)(scale * y[i + 1]); g.setColor( gradient(1. * i / theta.length, Color.ORANGE, Color.CYAN) ); g.drawLine( x1, y1, x2, y2 ); } } /** This method is called from within the init() method to * initialize the form. * WARNING: Do NOT modify this code. The content of this method is * always regenerated by the Form Editor. */ // //GEN-BEGIN:initComponents private void initComponents() { PlotPanel = new javax.swing.JPanel(); ControlPanel = new javax.swing.JPanel(); jSlider1 = new javax.swing.JSlider(); jSlider2 = new javax.swing.JSlider(); jSlider3 = new javax.swing.JSlider(); jSlider4 = new javax.swing.JSlider(); jTextField1 = new javax.swing.JTextField(); jTextField2 = new javax.swing.JTextField(); jTextField3 = new javax.swing.JTextField(); jLabel1 = new javax.swing.JLabel(); jLabel2 = new javax.swing.JLabel(); jLabel3 = new javax.swing.JLabel(); jLabel4 = new javax.swing.JLabel(); RandomButton = new javax.swing.JButton(); javax.swing.GroupLayout PlotPanelLayout = new javax.swing.GroupLayout(PlotPanel); PlotPanel.setLayout(PlotPanelLayout); PlotPanelLayout.setHorizontalGroup( PlotPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 483, Short.MAX_VALUE) ); PlotPanelLayout.setVerticalGroup( PlotPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGap(0, 167, Short.MAX_VALUE) ); getContentPane().add(PlotPanel, java.awt.BorderLayout.CENTER); jSlider1.setMaximum( maxR ); jSlider1.setMinimum( minR ); jSlider1.setValue(R); jSlider1.addChangeListener(new javax.swing.event.ChangeListener() { public void stateChanged(javax.swing.event.ChangeEvent evt) { sliderChange(evt); } }); jSlider2.setMaximum( maxr ); jSlider2.setMinimum( minr ); jSlider2.setValue(r); jSlider2.addChangeListener(new javax.swing.event.ChangeListener() { public void stateChanged(javax.swing.event.ChangeEvent evt) { sliderChange(evt); } }); jSlider3.setMaximum( maxd ); jSlider3.setMinimum( mind ); jSlider3.setValue(d); jSlider3.addChangeListener(new javax.swing.event.ChangeListener() { public void stateChanged(javax.swing.event.ChangeEvent evt) { sliderChange(evt); } }); jSlider4.setValue(20); jSlider4.addChangeListener(new javax.swing.event.ChangeListener() { public void stateChanged(javax.swing.event.ChangeEvent evt) { sliderChange(evt); } }); jTextField1.setColumns(3); jTextField1.setText(Integer.toString(R)); jTextField2.setColumns(3); jTextField2.setText(Integer.toString(r)); jTextField3.setColumns(3); jTextField3.setText(Integer.toString(d)); jLabel1.setText("Fixed circle"); jLabel2.setText("Moving circle"); jLabel3.setText("Offset"); jLabel4.setText("Scale"); RandomButton.setText("Random"); RandomButton.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { RandomButtonActionPerformed(evt); } }); javax.swing.GroupLayout ControlPanelLayout = new javax.swing.GroupLayout(ControlPanel); ControlPanel.setLayout(ControlPanelLayout); ControlPanelLayout.setHorizontalGroup( ControlPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(ControlPanelLayout.createSequentialGroup() .addContainerGap() .addGroup(ControlPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(ControlPanelLayout.createSequentialGroup() .addGroup(ControlPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jLabel1) .addComponent(jLabel2) .addComponent(jLabel3) .addComponent(jLabel4)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(ControlPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jSlider4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addGroup(ControlPanelLayout.createSequentialGroup() .addComponent(jSlider3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(ControlPanelLayout.createSequentialGroup() .addGroup(ControlPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jSlider2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jSlider1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addGroup(ControlPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))))) .addComponent(RandomButton)) .addContainerGap(143, Short.MAX_VALUE)) ); ControlPanelLayout.setVerticalGroup( ControlPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(ControlPanelLayout.createSequentialGroup() .addContainerGap() .addGroup(ControlPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jLabel1) .addComponent(jSlider1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(ControlPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jLabel2) .addComponent(jSlider2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(ControlPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(ControlPanelLayout.createSequentialGroup() .addGroup(ControlPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jLabel3) .addComponent(jSlider3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(ControlPanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jLabel4) .addComponent(jSlider4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(RandomButton)) .addComponent(jTextField3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addContainerGap(22, Short.MAX_VALUE)) ); getContentPane().add(ControlPanel, java.awt.BorderLayout.SOUTH); }// //GEN-END:initComponents private void sliderChange(javax.swing.event.ChangeEvent evt) {//GEN-FIRST:event_sliderChange BoundedRangeModel m1 = jSlider1.getModel(); BoundedRangeModel m2 = jSlider2.getModel(); BoundedRangeModel m3 = jSlider3.getModel(); BoundedRangeModel m4 = jSlider4.getModel(); scale = m4.getValue() / 10.; R = m1.getValue(); r = m2.getValue(); d = m3.getValue(); jTextField1.setText( Integer.toString(R) ); jTextField2.setText( Integer.toString(r) ); jTextField3.setText( Integer.toString(d) ); draw(); }//GEN-LAST:event_sliderChange private void RandomButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_RandomButtonActionPerformed BoundedRangeModel m1 = jSlider1.getModel(); BoundedRangeModel m2 = jSlider2.getModel(); BoundedRangeModel m3 = jSlider3.getModel(); BoundedRangeModel m4 = jSlider4.getModel(); m4.setValue( 20 ); m1.setValue( (int)(minR + Math.random() * (maxR - minR)) ); m2.setValue( (int)(minr + Math.random() * (maxr - minr)) ); m3.setValue( (int)(mind + Math.random() * (maxd - mind)) ); }//GEN-LAST:event_RandomButtonActionPerformed // Variables declaration - do not modify//GEN-BEGIN:variables private javax.swing.JPanel ControlPanel; private javax.swing.JPanel PlotPanel; private javax.swing.JButton RandomButton; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JLabel jLabel3; private javax.swing.JLabel jLabel4; private javax.swing.JSlider jSlider1; private javax.swing.JSlider jSlider2; private javax.swing.JSlider jSlider3; private javax.swing.JSlider jSlider4; private javax.swing.JTextField jTextField1; private javax.swing.JTextField jTextField2; private javax.swing.JTextField jTextField3; // End of variables declaration//GEN-END:variables }