## Related questions with answers

Question

(Geometry: point position) Programming Exercise 3.32 shows how to test whether a point is on the left side of a directed line, on the right, or on the same line. Write the methods with the following headers:

```
/** Return true if point (x2, y2) is on the left side of the
* directed line from (x0, y0) to (x1, y1) */
public static boolean leftOfTheLine(double x0, double y0,
double x1, double y1, double x2, double y2)
/** Return true if point (x2, y2) is on the same
* line from (x0, y0) to (x1, y1) */
public static boolean onTheSameLine(double x0, double y0,
double x1, double y1, double x2, double y2)
/** Return true if point (x2, y2) is on the
* line segment from (x0, y0) to (x1, y1) */
public static boolean onTheLineSegment(double x0, double y0,
double x1, double y1, double x2, double y2)
```

Write a program that prompts the user to enter the three points for p0 , p1 , and p2 and displays whether p2 is on the left side of the line from p0 to p1 , right side, the same line, or on the line segment. Here are some sample runs:

```
Enter three points for p0, p1, and p2: 1 1 2 2 1.5 1.5
(1.5, 1.5) is on the line segment from (1.0, 1.0) to (2.0, 2.0)
Enter three points for p0, p1, and p2: 1 1 2 2 3 3
(3.0, 3.0) is on the same line from (1.0, 1.0) to (2.0, 2.0)
Enter three points for p0, p1, and p2: 1 1 2 2 1 1.5
(1.0, 1.5) is on the left side of the line
from (1.0, 1.0) to (2.0, 2.0)
Enter three points for p0, p1, and p2: 1 1 2 2 1 –1
(1.0, −1.0) is on the right side of the line
from (1.0, 1.0) to (2.0, 2.0)
```

Solution

VerifiedAnswered 6 months ago

Answered 6 months ago

Step 1

1 of 4```
import java.util.Scanner;
public class Main
{
public static void main(String[] args)
{
Scanner input = new Scanner(System.in);
System.out.print("Enter three points for p0, p1, and p2: ");
double x0 = input.nextDouble();
double y0 = input.nextDouble();
double x1 = input.nextDouble();
double y1 = input.nextDouble();
double x2 = input.nextDouble();
double y2 = input.nextDouble();
System.out.print("(" + x2 + ", " + y2 + ") is on the");
if (onTheLineSegment(x0, y0, x1, y1, x2, y2))
System.out.print(" line segment ");
else if (leftOfTheLine(x0, y0, x1, y1, x2, y2))
System.out.print(" left side of the line ");
else if (onTheSameLine(x0, y0, x1, y1, x2, y2))
System.out.print(" same line ");
else
System.out.print(" right side of the line");
System.out.print(" from " + "(" + x0 + ", " + y0 +
") to (" + x1 + ", " + y1 + ")");
}
public static boolean leftOfTheLine(double x0, double y0,
double x1, double y1, double x2, double y2)
{
return pointPosition(x0, y0, x1, y1, x2, y2) > 0;
}
public static boolean onTheSameLine(double x0, double y0,
double x1, double y1, double x2, double y2)
{
return pointPosition(x0, y0, x1, y1, x2, y2) == 0;
}
```

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