Add a PointEngine to retrieve points.

src/main/java/net/themusicinnoise/vaccalc/CalendarPanel.java

@@ -10,12 +10,14 @@ import java.util.HashSet;
 import java.util.Set;
 
 public class CalendarPanel extends JPanel {
+    private PointEngine pointEngine;
     private YearMonth currentMonth;
     private final int cellHeight = 60;
     private final int cellWidth = 80;
     private final Set<LocalDate> selectedDates = new HashSet<>();
 
-    public CalendarPanel() {
+    public CalendarPanel(PointEngine pointEngine) {
+        this.pointEngine = pointEngine;
         this.currentMonth = YearMonth.now();
         setPreferredSize(new Dimension(7 * cellWidth, 8 * cellHeight));
         setBackground(Color.WHITE);
@@ -77,7 +79,13 @@ public class CalendarPanel extends JPanel {
     }
 
     public double getTotalPoints() {
-        return selectedDates.size() * 1.0;
+        double totalPoints = 0.0;
+
+        for (LocalDate date : selectedDates) {
+            totalPoints += pointEngine.getPointsOfDay(date);
+        }
+
+        return totalPoints;
     }
 
     private LocalDate getDateAtPoint(int x, int y) {
@@ -168,7 +176,7 @@ public class CalendarPanel extends JPanel {
             int textY = y + (cellHeight - fm.getHeight()) / 2 + fm.getAscent() - 8;
             g.drawString(dayStr, textX, textY);
 
-            String pointsStr = "(1.0)";
+            String pointsStr = "(" + pointEngine.getPointsOfDay(cellDate) + ")";
             Font smallFont = new Font("Arial", Font.PLAIN, 10);
             FontMetrics smallFm = g.getFontMetrics(smallFont);
             g.setFont(smallFont);

src/main/java/net/themusicinnoise/vaccalc/PointEngine.java

@@ -0,0 +1,17 @@
+package net.themusicinnoise.vaccalc;
+
+import java.time.LocalDate;
+
+public class PointEngine {
+    private double defaultPoints;
+
+    public PointEngine() {
+        defaultPoints = 1.0;
+    }
+
+    public void setDefaultPoints(float defaultPoints) { this.defaultPoints = defaultPoints; }
+
+    public double getPointsOfDay(LocalDate date) {
+        return defaultPoints;
+    }
+}

src/main/java/net/themusicinnoise/vaccalc/VacCalc.java

@@ -9,6 +9,7 @@ public class VacCalc extends JFrame {
     private CalendarPanel calendarPanel;
     private JLabel monthLabel;
     private JLabel pointsLabel;
+    private PointEngine pointEngine;
 
     public VacCalc() {
         setTitle("VacCalc");
@@ -29,7 +30,8 @@ public class VacCalc extends JFrame {
         menuBar.add(appMenu);
         setJMenuBar(menuBar);
 
-        calendarPanel = new CalendarPanel();
+        pointEngine = new PointEngine();
+        calendarPanel = new CalendarPanel(pointEngine);
 
         JPanel headerPanel = createHeaderPanel();
         JPanel footerPanel = createFooterPanel();