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#include "DarkGDK.h"

void DarkGDK()
{
	//set window title
	dbSetWindowTitle("Array of Colors");

    // Color constants
    const DWORD RED     = dbRGB(255, 0, 0);
    const DWORD GREEN   = dbRGB(0, 255, 0);
    const DWORD BLUE    = dbRGB(0, 0, 255);
    const DWORD MAGENTA = dbRGB(255, 0, 255);

    // Constant for time delay (half a second)
    const int DELAY = 500;

    // Constant for the array size
    const int SIZE = 4;

    // Array of colors
    DWORD colors[SIZE] = { RED, GREEN, BLUE, MAGENTA };

    // Variable to use as an array index
    int index;

    // Seed the random number generator.
    dbRandomize( dbTimer() );

    // Repeatedly clear the screen with random colors.
    while ( LoopGDK() )
    {
        // Get a random number
        index = dbRND( SIZE - 1 );
		
        // Clear the screen to a random color.
        dbCLS( colors[index] );
		
        // Wait.
        dbWait(DELAY);
    }
}

// initialize both indexes to impossible array index
int LastIndex = -1;
int index = -1;

    // Repeatedly clear the screen with random colors.
    while ( LoopGDK() )
    {
        // Get a random number until we get a different one
        while (index == LastIndex) index = dbRND( SIZE - 1 );
        LastIndex = index;
		
        // Clear the screen to a random color.
        dbCLS( colors[index] );
		
        // Wait.
        dbWait(DELAY);
    }
}