Rounding the corners of a rectilinear polygon generated by a selection of calendar made with JList

• download example.jar
• download src.zip
• repository

Code

public static Path2D convertRoundedPath(List<Point2D> list, double arc) {
  double kappa = 4d * (Math.sqrt(2d) - 1d) / 3d; // = 0.55228...;
  double akv = arc - arc * kappa;
  int sz = list.size();
  Point2D pt0 = list.get(0);
  Path2D path = new Path2D.Double();
  path.moveTo(pt0.getX() + arc, pt0.getY());
  for (int i = 0; i < sz; i++) {
    Point2D prv = list.get((i - 1 + sz) % sz);
    Point2D cur = list.get(i);
    Point2D nxt = list.get((i + 1) % sz);
    double dx0 = Math.signum(cur.getX() - prv.getX());
    double dy0 = Math.signum(cur.getY() - prv.getY());
    double dx1 = Math.signum(nxt.getX() - cur.getX());
    double dy1 = Math.signum(nxt.getY() - cur.getY());
    path.curveTo(
        cur.getX() - dx0 * akv, cur.getY() - dy0 * akv,
        cur.getX() + dx1 * akv, cur.getY() + dy1 * akv,
        cur.getX() + dx1 * arc, cur.getY() + dy1 * arc);
    path.lineTo(nxt.getX() - dx1 * arc, nxt.getY() - dy1 * arc);
  }
  path.closePath();
  return path;
}

References

• Rounding the corners of a rectilinear polygon generated by a selection of calendar made with JList(Japanese)

Create Week Calendar in JList and display contribution activity heatmap

• download example.jar
• download src.zip
• repository

Code

JList<Contribution> weekList = new JList<Contribution>() {
  @Override public void updateUI() {
    setCellRenderer(null);
    super.updateUI();
    setLayoutOrientation(JList.VERTICAL_WRAP);
    setVisibleRowCount(DayOfWeek.values().length); // ensure 7 rows in the list
    setFixedCellWidth(size.width);
    setFixedCellHeight(size.height);
    setCellRenderer(new ContributionListRenderer());
    getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
    setBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));
  }
};
// ...
private class ContributionListRenderer implements ListCellRenderer<Contribution> {
  private final Icon emptyIcon = new ColorIcon(Color.WHITE);
  private final ListCellRenderer<? super Contribution> renderer
    = new DefaultListCellRenderer();
  @Override public Component getListCellRendererComponent(
      JList<? extends Contribution> list, Contribution value, int index,
      boolean isSelected, boolean cellHasFocus) {
    JLabel l = (JLabel) renderer.getListCellRendererComponent(
        list, null, index, isSelected, cellHasFocus);
    if (value.date.isAfter(currentLocalDate)) {
      l.setIcon(emptyIcon);
      l.setToolTipText(null);
    } else {
      l.setIcon(activityIcons.get(value.activity));
      String actTxt = value.activity == 0 ? "No" : Objects.toString(value.activity);
      l.setToolTipText(actTxt + " contribution on " + value.date.toString());
    }
    return l;
  }
}

References

• Create Week Calendar in JList and display contribution activity heatmap(Japanese)

Create a range selectable calendar with JList

• download example.jar
• download src.zip
• repository

Code

public final LocalDate realLocalDate = LocalDate.now();
public LocalDate currentLocalDate;
public final Dimension size = new Dimension(40, 26);

// ...
JLabel yearMonthLabel = new JLabel("", SwingConstants.CENTER);
JList<LocalDate> monthList = new JList<LocalDate>(new CalendarViewListModel(realLocalDate)) {
  @Override public void updateUI() {
    setCellRenderer(null);
    super.updateUI();
    setLayoutOrientation(JList.HORIZONTAL_WRAP);
    setVisibleRowCount(CalendarViewListModel.ROW_COUNT); // ensure 6 rows in the list
    setFixedCellWidth(size.width);
    setFixedCellHeight(size.height);
    setCellRenderer(new CalendarListRenderer<>());
    getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
  }
};

// ...
class CalendarViewListModel extends AbstractListModel<LocalDate> {
  public static final int ROW_COUNT = 6;
  private final LocalDate startDate;
  private final WeekFields weekFields = WeekFields.of(Locale.getDefault());
  protected CalendarViewListModel(LocalDate date) {
    super();
    LocalDate firstDayOfMonth = YearMonth.from(date).atDay(1);
    int dowv = firstDayOfMonth.get(weekFields.dayOfWeek()) - 1;
    startDate = firstDayOfMonth.minusDays(dowv);
  }

  @Override public int getSize() {
    return DayOfWeek.values().length * ROW_COUNT;
  }

  @Override public LocalDate getElementAt(int index) {
    return startDate.plusDays(index);
  }
}

References

• Create a range selectable calendar with JList(Japanese)
• Java Swing Tips: Apply LocalDate considering Locale to JTable and display calendar

Apply LocalDate considering Locale to JTable and display calendar

• download example.jar
• download src.zip
• repository

java -Duser.language=en -Duser.country=US -jar example.jar

java -Duser.language=fr -Duser.country=FR -jar example.jar

java -Duser.language=ar -Duser.country=AE -jar example.jar

Code

class CalendarViewTableModel extends DefaultTableModel {
  private final LocalDate startDate;
  private final WeekFields weekFields = WeekFields.of(Locale.getDefault());

  public CalendarViewTableModel(LocalDate date) {
    super();
    LocalDate firstDayOfMonth = YearMonth.from(date).atDay(1);
    int dowv = firstDayOfMonth.get(weekFields.dayOfWeek()) - 1;
    startDate = firstDayOfMonth.minusDays(dowv);
  }

  @Override public Class<?> getColumnClass(int column) {
    return LocalDate.class;
  }

  @Override public String getColumnName(int column) {
    return weekFields.getFirstDayOfWeek().plus(column)
      .getDisplayName(TextStyle.SHORT_STANDALONE, Locale.getDefault());
  }

  @Override public int getRowCount() {
    return 6;
  }

  @Override public int getColumnCount() {
    return 7;
  }

  @Override public Object getValueAt(int row, int column) {
    return startDate.plusDays(row * getColumnCount() + column);
  }

  @Override public boolean isCellEditable(int row, int column) {
    return false;
  }
}

References

• Apply LocalDate considering Locale to JTable and display calendar(Japanese)
• Local Date Combo « Java Tips Weblog