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Submissions/CS1073 As5/Archive/Source Code/Question 2/LineSegment.java

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+/**
+ This class represents a 2D line segment using 2 points.
+ @author Natalie Webber
+ @author Scott Bateman
+ @author Isaac Shoebottom (3429069)
+*/
+public class LineSegment {
+
+  private CartesianPoint pointA;
+  private CartesianPoint pointB;
+  
+
+  public LineSegment (double x1, double y1, double x2, double y2) {
+    pointA = new CartesianPoint (x1, y1);
+    pointB = new CartesianPoint (x2, y2);
+  }
+  
+  public LineSegment (CartesianPoint p1, CartesianPoint p2) {
+    pointA = p1;
+    pointB = p2;
+  }
+
+  public double getLength () {
+    return pointA.distance(pointB);
+  }
+
+    /**
+     * This method checks the cross product and dot products of the line and the given point to check if the point p is on the segment
+     * @param p The point that is being tested to be on the segment
+     * @return Value of if the returned point is on the segment
+     */
+  public Boolean containsPoint (CartesianPoint p) {
+      double crossProduct;
+      crossProduct = ((p.getY() - pointA.getY()) * (pointB.getX() - pointA.getX())) - ((p.getX() - pointA.getX()) * (pointB.getY() - pointA.getY()));
+      if (Math.abs(crossProduct) > Math.ulp(1.0)) {
+        return false;
+      }
+      double dotProduct;
+      dotProduct = ((p.getX() - pointA.getX()) * (pointB.getX() - pointA.getX())) + ((p.getY() - pointA.getY()) * (pointB.getY() - pointA.getY()));
+      if (dotProduct < 0 ) {
+        return false;
+      }
+      double squaredLength;
+      squaredLength = ((pointB.getX() - pointA.getX()) * (pointB.getX() - pointA.getX())) + ((pointB.getY() - pointA.getY()) * (pointB.getY() - pointA.getY()));
+      if (dotProduct > squaredLength) {
+        return false;
+      }
+      return true;
+  }
+
+    /**
+     * Method to check if the line is vertical (only on one point in the x axis)
+     * @return The value of is the line is vertical or not
+     */
+  public boolean isVertical() {
+    if (pointA.getX() == pointB.getX()) {
+      return false;
+    }
+    else {
+      return true;
+    }
+  }
+}

Submissions/CS1073 As5/Archive/Source Code/Question 2/TestLine.java

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+/**
+ * @author Isaac Shoebottom (3429069)
+ */
+public class TestLine {
+
+    public static void main(String[] args) {
+
+        LineSegment segment1 = new LineSegment(1.0, 1.0, 5.0, 5.0);
+        CartesianPoint point1s1 = new CartesianPoint(3.0, 3.0);
+        CartesianPoint point2s1 = new CartesianPoint(2.0, 3.0);
+
+
+        LineSegment segment2 = new LineSegment(2.0, 2.0, 2.0, 6.0);
+        CartesianPoint point1s2 = new CartesianPoint(2.0, 4.0);
+        CartesianPoint point2s2 = new CartesianPoint(1.0, 5.0);
+
+        if (segment1.isVertical()) {
+            System.out.println("Segment 1 is vertical");
+        }
+        else {
+            System.out.println("Segment 1 is not vertical");
+        }
+
+        if (segment1.containsPoint(point1s1)){
+            System.out.println("Point 1 is on the line segment");
+        }
+        else {
+            System.out.println("Point 1 is not on the line segment");
+        }
+
+        if (segment1.containsPoint(point2s1)){
+            System.out.println("Point 2 is on the line segment");
+        }
+        else {
+            System.out.println("Point 2 is not on the line segment");
+        }
+
+        if (segment2.isVertical()) {
+            System.out.println("Segment 2 is vertical");
+        }
+        else {
+            System.out.println("Segment 2 is not vertical");
+        }
+
+        if (segment2.containsPoint(point1s2)){
+            System.out.println("Point 1 is on the line segment");
+        }
+        else {
+            System.out.println("Point 1 is not on the line segment");
+        }
+
+        if (segment2.containsPoint(point2s2)){
+            System.out.println("Point 2 is on the line segment");
+        }
+        else {
+            System.out.println("Point 2 is not on the line segment");
+        }
+    }
+}