How use a switch case for two variables?

Question

Consider the code :

private String mode;        // current played mode

private void func(int row , int column)
{
    // rotation mode 
    if ((row == 0 && column == 0) || (row == 2 && column == 0) || (row == 0 && column == 2) || (row == 2 && column == 2)) 
    {
        mode = ROTATE_MODE;
    }

    // scaling more 
    else if ((row == 0 && column == 1) || (row == 1 && column == 0) || (row == 2 && column == 1) || (row == 1 && column == 2)) 
    {
        mode = SCALE_MODE;
    }

    // translate mode
    else if ((row == 1 && column == 1)) 
    {
        mode = TRANSLATE_MODE;
    }
}

How can I use a Switch-case for row and column?

Have you already checked http://stackoverflow.com/questions/15991167/switch-case-for-two-int-variables? It may be useful to you. — Lucia Pasarin, Apr 27 '13 at 14:24

score 6 · Accepted Answer · answered Apr 27 '13 at 14:23

6

Depending on the range of the values you can use a formula

switch(row * 10 + column) {
   case 0, 20, 2, 22:

       break;
   case 1, 10, 21, 12:

       break;
   case 11:

       break;
 }

answered Apr 27 '13 at 14:23

Peter Lawrey

525,659
79
751
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score 3 · Answer 2 · answered Apr 27 '13 at 14:29

3

You could combine them into one variable. For example, if the maximum number of columns is 100 (0-99):

int position = row * 100 + column;
switch (position) {
  case 0: // row 0, col 0
  case 200: // row 2, col 0
  case 2: // row 0, col 2
  case 202: // row 2, col 2
    this.m_mode = ROTATE_MODE;
    break;
  ...
}

answered Apr 27 '13 at 14:29

Alvin Thompson

5,388
3
26
39

2

In all fairness, @Peter left his answer first. He should get the "accepted answer" points. – Alvin Thompson Apr 27 '13 at 14:49

How use a switch case for two variables?

2 Answers2