// Performs a binary search to satisfy the Wolfe conditions
// returns alpha where next x =should be x0 + alpha*d
// guarantees convergence as long as search direction is bounded away from being orthogonal with
// gradient
// x0 is starting point, d is search direction, alpha is starting step size, maxit is max
// iterations
// c1 and c2 are the constants of the Wolfe conditions (0.1 and 0.9 can work)
// uses an approximate directional gradient since a true gradient is not defined for the optical
// flow error function
public double stepSize(double[] x0, double[] d, double alpha, int maxit, double c1, double c2) {
// get error and gradient at starting point
double fx0 = error(x0);
double gx0 = dotGradient(x0, d);
// bound the solution
double alphaL = 0;
double alphaR = 100;
for (int iter = 1; iter <= maxit; iter++) {
double[] xp = Utility.add(x0, Utility.scale(d, alpha)); // get the point at this alpha
double erroralpha = error(xp); // get the error at that point
if (erroralpha >= fx0 + alpha * c1 * gx0) { // if error is not sufficiently reduced
alphaR = alpha; // move halfway between current alpha and lower alpha
alpha = (alphaL + alphaR) / 2.0;
} else { // if error is sufficiently decreased
double slopealpha = dotGradient(xp, d); // then get slope along search direction
if (slopealpha <= c2 * Math.abs(gx0)) { // if slope sufficiently closer to 0
return alpha; // then this is an acceptable point
} else if (slopealpha
>= c2 * gx0) { // if slope is too steep and positive then go to the left
alphaR = alpha; // move halfway between current alpha and lower alpha
alpha = (alphaL + alphaR) / 2;
} else { // if slope is too steep and negative then go to the right of this alpha
alphaL = alpha; // move halfway between current alpha and upper alpha
alpha = (alphaL + alphaR) / 2;
}
}
}
// if ran out of iterations then return the best thing we got
return alpha;
}
// returns the gradient of the function at x dotted with d
// used with line-search which never requires the full gradient
public double dotGradient(double x[], double d[]) {
double p1[] = Utility.subtract(x, Utility.scaleTo(d, gradientepsilon));
double p2[] = Utility.add(x, Utility.scaleTo(d, gradientepsilon));
double f1 = error(p1);
double f2 = error(p2);
return (f2 - f1) / (gradientepsilon * 2);
}
/*
* Constructor
*
* Create the dialog but don't display it (gets displayed when user selects "Settings..." menu item)
*
*/
public CTsettings(JFrame parentI) {
super(parentI, "CTtext Settings", true);
parent = parentI;
setFont(new Font("Dialog", Font.PLAIN, 12));
GridBagLayout gbl = new GridBagLayout();
JPanel guiPanel = new JPanel(gbl);
GridBagConstraints gbc = new GridBagConstraints();
gbc.anchor = GridBagConstraints.WEST;
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
gbc.weighty = 0;
// Create GUI components
outputDirTF = new JTextField(25);
chanNameTF = new JTextField(10);
bUseFTPCheckB = new JCheckBox("Use FTP");
bUseFTPCheckB.addItemListener(this);
ftpHostLabel = new JLabel("Host", SwingConstants.LEFT);
ftpHostTF = new JTextField(20);
ftpUserLabel = new JLabel("Username", SwingConstants.LEFT);
ftpUserTF = new JTextField(15);
ftpPasswordLabel = new JLabel("Password", SwingConstants.LEFT);
ftpPasswordTF = new JPasswordField(15);
autoFlushRB = new JRadioButton("Automatic flush at interval");
autoFlushRB.addItemListener(this);
manualFlushRB = new JRadioButton("Manual flush on button click");
flushButtonGroup = new ButtonGroup();
flushButtonGroup.add(autoFlushRB);
flushButtonGroup.add(manualFlushRB);
flushIntervalLabel = new JLabel("Flush interval", SwingConstants.LEFT);
flushIntervalComboB = new JComboBox<String>(flushIntervalStrings);
flushIntervalComboB.setPrototypeDisplayValue("XXXXXXXXXXXXXXXXXXX");
flushIntervalComboB.setEditable(false);
okButton = new JButton("OK");
okButton.addActionListener(this);
cancelButton = new JButton("Cancel");
cancelButton.addActionListener(this);
// Add components to the guiPanel
int row = 0;
// ROW 1
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
gbc.weighty = 0;
JLabel tempLabel = new JLabel("Output folder", SwingConstants.LEFT);
gbc.insets = new Insets(15, 15, 0, 10);
Utility.add(guiPanel, tempLabel, gbl, gbc, 0, row, 1, 1);
gbc.insets = new Insets(15, 0, 0, 15);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 100;
gbc.weighty = 0;
Utility.add(guiPanel, outputDirTF, gbl, gbc, 1, row, 1, 1);
row++;
// ROW 2
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
gbc.weighty = 0;
tempLabel = new JLabel("Channel name", SwingConstants.LEFT);
gbc.insets = new Insets(10, 15, 0, 10);
Utility.add(guiPanel, tempLabel, gbl, gbc, 0, row, 1, 1);
gbc.insets = new Insets(10, 0, 0, 15);
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
gbc.weighty = 0;
Utility.add(guiPanel, chanNameTF, gbl, gbc, 1, row, 1, 1);
row++;
// ROW 3
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
gbc.weighty = 0;
gbc.insets = new Insets(10, 15, 0, 15);
Utility.add(guiPanel, bUseFTPCheckB, gbl, gbc, 0, row, 2, 1);
row++;
// ROW 4: A panel containing the FTP parameters (host, username, password)
GridBagLayout panel_gbl = new GridBagLayout();
JPanel ftpPanel = new JPanel(panel_gbl);
GridBagConstraints panel_gbc = new GridBagConstraints();
panel_gbc.anchor = GridBagConstraints.WEST;
panel_gbc.fill = GridBagConstraints.NONE;
panel_gbc.weightx = 0;
panel_gbc.weighty = 0;
int panel_row = 0;
// Panel row 1: host
panel_gbc.insets = new Insets(0, 0, 0, 10);
Utility.add(ftpPanel, ftpHostLabel, panel_gbl, panel_gbc, 0, panel_row, 1, 1);
panel_gbc.insets = new Insets(0, 0, 0, 0);
Utility.add(ftpPanel, ftpHostTF, panel_gbl, panel_gbc, 1, panel_row, 1, 1);
panel_row++;
// Panel row 2: username
panel_gbc.insets = new Insets(2, 0, 0, 10);
Utility.add(ftpPanel, ftpUserLabel, panel_gbl, panel_gbc, 0, panel_row, 1, 1);
panel_gbc.insets = new Insets(2, 0, 0, 0);
Utility.add(ftpPanel, ftpUserTF, panel_gbl, panel_gbc, 1, panel_row, 1, 1);
panel_row++;
// Panel row 3: password
panel_gbc.insets = new Insets(2, 0, 0, 10);
Utility.add(ftpPanel, ftpPasswordLabel, panel_gbl, panel_gbc, 0, panel_row, 1, 1);
panel_gbc.insets = new Insets(2, 0, 0, 0);
Utility.add(ftpPanel, ftpPasswordTF, panel_gbl, panel_gbc, 1, panel_row, 1, 1);
// Add the panel to guiPanel
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
gbc.weighty = 0;
gbc.insets = new Insets(2, 50, 0, 15);
Utility.add(guiPanel, ftpPanel, gbl, gbc, 0, row, 2, 1);
row++;
// ROW 5
JPanel rbPanel = new JPanel(new FlowLayout(FlowLayout.LEADING, 5, 0));
rbPanel.add(autoFlushRB);
rbPanel.add(manualFlushRB);
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
gbc.weighty = 0;
gbc.insets = new Insets(10, 5, 0, 15);
Utility.add(guiPanel, rbPanel, gbl, gbc, 0, row, 2, 1);
row++;
// ROW 6
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
gbc.weighty = 0;
gbc.insets = new Insets(10, 15, 0, 10);
Utility.add(guiPanel, flushIntervalLabel, gbl, gbc, 0, row, 1, 1);
gbc.insets = new Insets(10, 0, 0, 15);
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0;
gbc.weighty = 0;
Utility.add(guiPanel, flushIntervalComboB, gbl, gbc, 1, row, 1, 1);
row++;
// ROW 7
// Put the command buttons in a JPanel so they are all the same size
JPanel buttonPanel = new JPanel(new GridLayout(1, 2, 15, 0));
buttonPanel.add(okButton);
buttonPanel.add(cancelButton);
// Don't have the buttons resize if the dialog is resized
gbc.weightx = 0;
gbc.weighty = 0;
gbc.ipadx = 20;
gbc.insets = new Insets(15, 25, 15, 25);
gbc.anchor = GridBagConstraints.CENTER;
Utility.add(guiPanel, buttonPanel, gbl, gbc, 0, row, 2, 1);
// Add guiPanel to the content pane of the parent JFrame
gbl = new GridBagLayout();
getContentPane().setLayout(gbl);
gbc = new GridBagConstraints();
gbc.anchor = GridBagConstraints.CENTER;
gbc.fill = GridBagConstraints.BOTH;
gbc.weightx = 100;
gbc.weighty = 100;
gbc.insets = new Insets(0, 0, 0, 0);
Utility.add(getContentPane(), guiPanel, gbl, gbc, 0, 0, 1, 1);
pack();
// Handle the close operation in the windowClosing() method of the
// registered WindowListener object. This will get around
// JFrame's default behavior of automatically hiding the window when
// the user clicks on the '[x]' button.
setDefaultCloseOperation(javax.swing.WindowConstants.DO_NOTHING_ON_CLOSE);
addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
cancelAction();
}
});
}
