Created class Vector2D.

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src/main/java/edu/ntnu/stud/model/Vector2D.java

+package edu.ntnu.stud.model;
+
+/**
+ * Class representing a 2D vector.
+ */
+public class Vector2D {
+
+  /**
+   * The x0 component of the vector.
+   */
+  private double x0;
+
+  /**
+   * The x1 component of the vector.
+   */
+  private double x1;
+
+  /**
+   * Create a new 2D vector.
+   *
+   * @param x0 The x0 component of the vector.
+   * @param x1 The x1 component of the vector.
+   */
+  public Vector2D(double x0, double x1) {
+    this.x0 = x0;
+    this.x1 = x1;
+  }
+
+  /**
+   * Get the x0 component of the vector.
+   *
+   * @return The x0 component of the vector.
+   */
+  public double getX0() {
+    return x0;
+  }
+
+  /**
+   * Get the x1 component of the vector.
+   *
+   * @return The x1 component of the vector.
+   */
+  public double getX1() {
+    return x1;
+  }
+
+  /**
+   * Add another vector to this vector.
+   *
+   * @param other The other vector to add.
+   * @return A new vector that is the sum of this vector and the other vector.
+   */
+  public Vector2D add(Vector2D other) {
+    return new Vector2D(x0 + other.x0, x1 + other.x1);
+  }
+
+  /**
+   * Subtract another vector from this vector.
+   *
+   * @param other The other vector to subtract.
+   * @return A new vector that is the difference between this vector and the other vector.
+   */
+  public Vector2D subtract(Vector2D other) {
+    return new Vector2D(x0 - other.x0, x1 - other.x1);
+  }
+
+}