Add spline painting to exercise.

README.md

@@ -84,4 +84,17 @@ In this exercise we need to implement this new method in the following classes:
     view/graphics/PaintableBezierCurve.java
 
 ### Expected behavior:
-Bezier Curve can be painted as before.
+Bezier Curve can be painted as before.
\ No newline at end of file
+
+## Exercise 7
+This exercise is based on the tenth lecture about the spline interpolation method.
+In this exercise we need to implement this new interpolation method in the following classes:
+
+    model/Spline.java
+
+Additionally, the following class was added to the project:
+
+    view/graphics/PaintableSpline.java
+    
+### Expected behavior:
+Spline interpolation can be painted.
\ No newline at end of file

src/main/java/irmb/flowsim/view/graphics/PaintableSpline.java

@@ -23,9 +23,33 @@ public class PaintableSpline extends PaintableShape {
     
     @Override
     public void paint(Painter painter) {
-        //TODO
-    }
+        List<Point> pointList = spline.getPointList();
+        int numOfPoints = 100;
+        painter.setColor(Color.BLACK);
+        // Spline zeichnen
+        if (pointList.size() > 2) {
+            for (int i = 0; i < numOfPoints - 1; i++) {
 
+                double t1 = (i) / (double) (numOfPoints - 1);
+                double t2 = (i + 1.0) / (double) (numOfPoints - 1);
+
+                Point p1 = spline.getPointOnSpline(t1);
+                Point p2 = spline.getPointOnSpline(t2);
+
+                // draw line
+                painter.paintLine(p1, p2);
+            }
+        }
+
+        // Kontrollpunkte zeichnen
+        for (int i = 0; i < pointList.size(); i++) {
+            Point p = pointList.get(i);
+            int k = 4;
+            Point p_view = trafo.transformToPointOnScreen(p);
+            painter.paintLine(p_view.getX() - k, p_view.getY() - k, p_view.getX() + k, p_view.getY() + k);
+            painter.paintLine(p_view.getX() + k, p_view.getY() - k, p_view.getX() - k, p_view.getY() + k);
+        }
+    }