EasyGL Tutorial - User Input

#include <iostream.h>
#include "easygl.h"

int cx=100, int cy=100, int r=10; //Global values for our circle

//-----------------------------------------------------------
void Keyboard();          //Function we will make to handel input
//------------------------------------------------------------

//------------------------------------------------------------
void EasyRender()
{
   clearGraph();

   //Setup a nice looking background
   color(0.0, 0.2, 0.5, 0.8);
   square(50, 50, 550, 550);
   square(300, 300, 800, 800, 0.0, 0.5, 1.0, 0.6);

   color(0.05, 0.1, 0.8, 0.8);
   circle(cx, cy, r);

   Keyboard();       //Call Keyboard to check and act on input
  update();
}
//------------------------------------------------------------

//------------------------------------------------------------
void Keyboard()
{
   //Check to see if the key is down, and if so move the circle
   if(GetAsyncKeyState('W')) cy-=3;       //Move up

   if(GetAsyncKeyState('S')) cy+=3;       //Move down

   if(GetAsyncKeyState('A')) cx-=3;       //Move left

   if(GetAsyncKeyState('D')) cx+=3;       //Move right
}
//------------------------------------------------------------

//------------------------------------------------------------
int main()
{
   initEasyGL();
   return 1;
}
//------------------------------------------------------------

/* Note: Keys that do not have a ASCII value are a numeric representation

ex/ the arrow keys are often used in gaming instead of W,S,A, and D
To check these Keys you simply use the following

VK_UP = up arrow
VK_DOWN
VK_RIGHT
VK_LEFT

ex: GetAsyncKeyState(VK_UP);
other definitions can be found in the MSDN help file
*/