register 2 simultaneous keypress'

I have written a program in opengl using c++ and i want to be able to fly along my scene by using the keyboard so far i have managed to do this using various functions however i would like to be able to push two buttons at once so i can move in two seperate directions at the same time. Currently i use a switch statement that listens for key strokes any ideas on how i can make it listen for two?

Code:

---

void keyboard(unsigned char key, int x, int y)
{
  char c='#';
 
  switch(key)
    {
                case('w'):
                        moveFlat(1);
                        break;
                case('s'):
                        moveFlat(-1);
                        break;
                case('q'):
                        moveUp(1);
                        break;
    }
  glutPostRedisplay();
}

---

This is the code i use to listen for key strokes. Many Thanks

Well obviously a switch won't work since it cannot account for two keys at the same time.

Code:

---

...
if (KeyDown(VK_W))
{
    Player->Walk(FORWARD);
}

if (KeyDown(VK_S))
{
    Player->Walk(BACKWARD);
}
...

---

Ive found that:

Code:

---

if (KeyDown(VK_W)&&KeyDown(VK_D)
{
    movement=NE;
}

---

works just fine for me

You might also try something like:

Code:

---

int x_inc = 0, y_inc = 0;
if (KEY_LEFT) x_inc -= 1;
if (KEY_RIGHT) x_inc += 1;
if (KEY_UP) y_inc -= 1;
if (KEY_DOWN) y_inc += 1;
move(position, x_inc, y_inc);

---

I think breaking movement down into the x and y component is a bit more flexible that having separate functions for horizontal and vertical (and possibly diagonal) movement or having to deal with otherwise rather unhelpful enumerations of directions.

I get.....

Code:

---

C:\Users\J\Desktop\openGL\OpenGame1\Main.cpp(452) : error C2065: 'KeyDown' : undeclared identifier
C:\Users\J\Desktop\openGL\OpenGame1\Main.cpp(452) : error C2065: 'VK_W' : undeclared identifier
C:\Users\J\Desktop\openGL\OpenGame1\Main.cpp(457) : error C2065: 'VK_A' : undeclared identifier

---

am i missing an include or do i have to define them somewhere?

Well those examples were just for reference, it depends on what platform your programming for:

GLUT, WIN32 API, SDL, wxWidgets etc...

You can look up the keyboard commands for whatever platform your using, or wrapper...

However unfortunately I'm not much of a help in that area

The examples I gave were simply that - examples. VK_W and VK_S are defined in Windows as virtual key codes for W and S. DirectInput uses these but remaps the constants to a different name.

The example was to show that a series of if statements will handle multiple key presses - provided your keyboard code correctly sets and tracks the state of the keyboard.