Line.java

Line.java

contents ::

  Line.java
  LinesAndPoints.java
  text

/*         James Little wednesday 7th March 2001
         Lines and points
*/
package jlittle_ex1;
import basicIO.*;
import java.text.*;

public class Line {

         // datafields, type long for big calculations.
         private long [] xPoint;
         private long [] yPoint;
         private long [] hypotenuse;
         // s is the number of segments in the line.
         private int s;

         // line constructor accepts segments, line number and x, y arrays
         public Line(int segs, int a, long [] x, long [] y) {
                  // segs is the number of segments in this line.. can be anything
                  s=segs;
                  // allocate array to array
                  xPoint = x;
                  yPoint = y;
                  // might as well print the line number here :)
                  Out.println("Line "+a);

         }


         // method think works out the distance of all segments and lines... also prints them
         public void think() {

                  // local variables
                  double distance=0;                           // length of one segment
                  double totalHyp=0;                           // takes value of shortest distance
                  double totalDist=0;                           // adds segment lengths
                  DecimalFormat df = new DecimalFormat("0.0");                  // for deciaml formatting

                  // this loop calculates the segment length and prints it out
                  // also calculates the total distance of the segments
                  for(int i=0; i<s; i++){
                           distance=(Math.sqrt((xPoint[i+1]-xPoint[i])*(xPoint[i+1]-xPoint[i])+(yPoint[i+1]-yPoint[i])*(yPoint[i+1]-yPoint[i])));
                           Out.println("\tSegment "+(i+1)+" distance "+df.format(distance)+" units");
                           totalDist+=distance;
                  }

                  // prints the total of the line
                  Out.println("\tTotal distance is: " + df.format(totalDist) + " units");

                  // long x and y accept the value of any difference between point 1 and point infinity, and square it
                  long x=(xPoint[xPoint.length-1]-xPoint[0])*(xPoint[xPoint.length-1]-xPoint[0]);
                  long y=(yPoint[yPoint.length-1]-yPoint[0])*(yPoint[yPoint.length-1]-yPoint[0]);

                  // total hyp accepts the hypotenuse
                  totalHyp=Math.sqrt(x+y);

                  // if the total hypotenuse is only one unit, then i will print a singular version.
                  if(totalHyp==1.0){
                           Out.println("\tStart-End shortest distance is: " + df.format(totalHyp) + " unit");
                  }else Out.println("\tStart-End shortest distance is: " + df.format(totalHyp) + " units");
         }



}

James Little