# Java Program to Show the Duality Transformation of Line and Point

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This is a java program to show the duality transformation of line and point. The transformation corresponds from line to point and point to line.

Here is the source code of the Java Program to Show the Duality Transformation of Line and Point. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

1. ` `
2. `package com.sanfoundry.computationalgeometry;`
3. ` `
4. `import java.util.Scanner;`
5. ` `
6. `public class DualityTransformationofPointandLine`
7. `{`
8. `    public static void performLineTransformation(double a, double b)`
9. `    {`
10. `        System.out.println("X: " + (b / a) + ", Y: " + (b * -1));`
11. `    }`
12. ` `
13. `    public static void performPointTransformation(double x, double y)`
14. `    {`
15. `        System.out.println("y=" + (-1 * y / x) + "x +" + (-1 * y));`
16. `    }`
17. ` `
18. `    public static void main(String[] args)`
19. `    {`
20. `        System.out`
21. `                .println("Perform what transformation.\n1. Line Transformation\n2. Point Transformation");`
22. `        Scanner sc = new Scanner(System.in);`
23. `        int option = sc.nextInt();`
24. `        switch (option)`
25. `        {`
26. `            case 1:`
27. `                System.out.println("Enter the coefficients of line <y=ax-b>");`
28. `                double a = sc.nextDouble();`
29. `                double b = sc.nextDouble();`
30. `                performLineTransformation(a, b);`
31. `                break;`
32. `            case 2:`
33. `                System.out.println("Enter the coordinate of point <x, y>");`
34. `                double x = sc.nextDouble();`
35. `                double y = sc.nextDouble();`
36. `                performPointTransformation(x, y);`
37. `                break;`
38. `            default:`
39. `                break;`
40. `        }`
41. `        sc.close();`
42. `    }`
43. `}`

Output:

```\$ javac DualityTransformationofPointandLine.java
\$ java DualityTransformationofPointandLine

Perform what transformation.
1. Line Transformation
2. Point Transformation
1
Enter the coefficients of line <y=ax-b>
1 2
X: 2.0, Y: -2.0

Perform what transformation.
1. Line Transformation
2. Point Transformation
2
Enter the coordinate of point <x, y>
2 -2
y=1.0x +2.0```

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