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FastCollinearPoints.java
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FastCollinearPoints.java
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import edu.princeton.cs.algs4.In;
import edu.princeton.cs.algs4.StdDraw;
import edu.princeton.cs.algs4.StdOut;
public class FastCollinearPoints {
Point[] points;
int nSeg;
/**
* finds all line segments containing 4 or more points
*
* @param points
*/
public FastCollinearPoints(Point[] points) {
this.points=points;
nSeg=0;
}
/**
* Find the number of line segments
*
* @return
*/
public int numberOfSegments() {
return nSeg;
}
/**
* the line segments
*
* @return
*/
public LineSegment[] segments() {
return null;
}
public static void main(String[] args) {
// read the n points from a file
In in = new In(args[0]);
int n = in.readInt();
Point[] points = new Point[n];
for (int i = 0; i < n; i++) {
int x = in.readInt();
int y = in.readInt();
points[i] = new Point(x, y);
}
// draw the points
StdDraw.enableDoubleBuffering();
StdDraw.setXscale(0, 32768);
StdDraw.setYscale(0, 32768);
for (Point p : points) {
p.draw();
}
StdDraw.show();
// print and draw the line segments
FastCollinearPoints collinear = new FastCollinearPoints(points);
for (LineSegment segment : collinear.segments()) {
StdOut.println(segment);
segment.draw();
}
StdDraw.show();
}
}