#include "ct_emu.h" // includes all ct emulator files

// int KeyDown() returns (immediately) the ASCII code of the key held
//   down at the moment of the function was called, or NO_KEY_PRESSED  
//   if no key was down at the moment of the call. 
//
//  These are the key codes, defined in ct_windows.h . You
//  should always use the uppercase symbolic names, the actual
//  integer values are just for your information.
//        const  int  NO_KEY_PRESSED = 0;
//        const  int  SHIFT_KEY   =  16;
//        const  int  CTRL_KEY    =  17;
//        const  int  SPACE_BAR   =  32;
//        const  int  RIGHT_ARROW =  39;
//        const  int  UP_ARROW    =  38;
//        const  int  LEFT_ARROW  =  37;
//        const  int  DOWN_ARROW  =  40;       
//
//  NOTE: The keys in the following example work only when the 
//        graphics window is active. Initially, the console window
//        is the active one, not the graphics window. 
//        You need to click the mouse inside the graphics window
//        to make it active, so that the keys work (the graphics 
//        window will then be the one receiving the Windows events 
//        generated by pressing the keys).  

//  DEMO 1: 
//        The mote's direction of movement is determined by the arrow keys,
//        the speed remains the same, SPACE interrups the loop. When at a
//        screen edge, the mote wraps around to the opposite edge.         


int main(){

    BigSquarePair();

    int x = 200, y = 200, r = 3;
    int vx = 0, vy = 0; 

    cout << "Direct the mote with arrow keys,\n";
    cout << "Hit SPACE to finish\n\n";

    int keycode = NO_KEY_PRESSED;  // will store the ASCII code of the key pressed

    while( keycode != SPACE_BAR ){
        keycode = KeyDown();       // obtain the code of the key being pressed now           
        switch( keycode ){  
        case LEFT_ARROW:
            vx = -2;
            break;
        case RIGHT_ARROW:
            vx = 2;
            break;
        case UP_ARROW:
            vy = -2;
            break;
        case DOWN_ARROW:
            vy = 2;
            break;
        default:             // this case includes NO_KEY_PRESSED, so movements stops
            vx = vy = 0;     //   as soon as an arrow key is released.
            break;
        }
        SetForeColor( 255, 255, 255 );  // erase mote
        PaintCircle( x, y, r );

        x += vx;                  // update position
        y += vy;

        if( x < 0 )               // wrap around the screen if going  
            x = 400;              // out of the borders
        else if( x > 400 )
            x = 0;

        if( y < 0 ) 
            y = 400;
        else if( y > 400 )
            y = 0;

        SetForeColor( 0, 0, 255 );     // draw mote
        PaintCircle( x, y, r );
        Delay( 50 );
    }

    PressReturn();

    return 0;
}