@Test
public void shouldReturnTheCorrectSize() {
assertEquals(0, cut.size());
cut.insert(new Point2D(.0, .0));
assertEquals(1, cut.size());
cut.insert(new Point2D(.1, .1));
assertEquals(2, cut.size());
}
@Test
public void shouldGiveTheCorrectNearestPoint() {
cut.insert(new Point2D(.0, .0));
cut.insert(new Point2D(.0, .1));
cut.insert(new Point2D(.0, .2));
cut.insert(new Point2D(.0, .3));
cut.insert(new Point2D(.0, .4));
Point2D nearest = cut.nearest(new Point2D(.2, .2));
assertEquals(new Point2D(.0, .2), nearest);
}
@Test
public void shouldGiveTheCorrectRange() {
cut.insert(new Point2D(.0, .0));
cut.insert(new Point2D(.1, .1));
cut.insert(new Point2D(.2, .2));
cut.insert(new Point2D(.3, .3));
cut.insert(new Point2D(.4, .4));
cut.insert(new Point2D(.5, .5));
List<Point2D> range = (List<Point2D>) cut.range(new RectHV(.1, .1, .4, .4));
assertEquals(4, range.size());
assertTrue(range.contains(new Point2D(.1, .1)));
assertTrue(range.contains(new Point2D(.2, .2)));
assertTrue(range.contains(new Point2D(.3, .3)));
assertTrue(range.contains(new Point2D(.4, .4)));
}
@Test
public void shouldCorrectlyDiscoverIfElementIsInSET() {
cut.insert(new Point2D(.1, .1));
assertFalse(cut.contains(new Point2D(.0, .0)));
assertTrue(cut.contains(new Point2D(.1, .1)));
}
/** @param args */
public static void main(String[] args) {
KdTree tree = new KdTree();
Point2D p1 = new Point2D(0.5, 0.5);
Point2D p2 = new Point2D(0.25, 0.5);
Point2D p3 = new Point2D(0.75, 0.5);
tree.insert(p1);
tree.insert(p2);
tree.insert(p3);
Point2D qp = new Point2D(0.5, 0.49);
Point2D np = tree.nearest(qp);
StdOut.println(np.x() + ", " + np.y());
}
@Test(expected = NullPointerException.class)
public void shouldThrowNullPointerExceptionWhenInsertingNull() {
cut.insert(null);
}
@Test
public void shouldReturnFalseIfSetIsNotEmpty() {
cut.insert(new Point2D(.0, .0));
assertFalse(cut.isEmpty());
}
public static void main(String[] args) {
String filename = args[0];
In in = new In(filename);
StdDraw.show(0);
// initialize the data structures with N points from standard input
PointSET brute = new PointSET();
KdTree kdtree = new KdTree();
while (!in.isEmpty()) {
double x = in.readDouble();
double y = in.readDouble();
Point2D p = new Point2D(x, y);
kdtree.insert(p);
brute.insert(p);
}
double x0 = 0.0, y0 = 0.0; // initial endpoint of rectangle
double x1 = 0.0, y1 = 0.0; // current location of mouse
boolean isDragging = false; // is the user dragging a rectangle
// draw the points
StdDraw.clear();
StdDraw.setPenColor(StdDraw.BLACK);
StdDraw.setPenRadius(.01);
brute.draw();
while (true) {
StdDraw.show(40);
// user starts to drag a rectangle
if (StdDraw.mousePressed() && !isDragging) {
x0 = StdDraw.mouseX();
y0 = StdDraw.mouseY();
isDragging = true;
continue;
}
// user is dragging a rectangle
else if (StdDraw.mousePressed() && isDragging) {
x1 = StdDraw.mouseX();
y1 = StdDraw.mouseY();
continue;
}
// mouse no longer pressed
else if (!StdDraw.mousePressed() && isDragging) {
isDragging = false;
}
RectHV rect =
new RectHV(Math.min(x0, x1), Math.min(y0, y1), Math.max(x0, x1), Math.max(y0, y1));
// draw the points
StdDraw.clear();
StdDraw.setPenColor(StdDraw.BLACK);
StdDraw.setPenRadius(.01);
brute.draw();
// draw the rectangle
StdDraw.setPenColor(StdDraw.BLACK);
StdDraw.setPenRadius();
rect.draw();
// draw the range search results for brute-force data structure in
// red
StdDraw.setPenRadius(.03);
StdDraw.setPenColor(StdDraw.RED);
for (Point2D p : brute.range(rect)) p.draw();
// draw the range search results for kd-tree in blue
StdDraw.setPenRadius(.02);
StdDraw.setPenColor(StdDraw.BLUE);
for (Point2D p : kdtree.range(rect)) p.draw();
StdDraw.show(40);
}
}