[Tutorial] D3D Crosshairs

#define PI 3.14159265//Defining what PI is. PI is a Circle 
int CenterX = GetSystemMetrics( 0 ) / 2-1;//Gets screen X resolution then cutting it in half to get the center.
int CenterY = GetSystemMetrics( 1 ) / 2-1;//Gets screen Y resolution then cutting it in half to get the center.
LPDIRECT3DDEVICE9 pDevice;
ID3DXLine *pLine;

//FillRGB(XPosition,YPosition,Width,Height,Color);
Function:
void FillRGB( int x, int y, int w, int h, D3DCOLOR color, IDirect3DDevice9* pDevice )
{
	D3DRECT rec = { x, y, x + w, y + h };
	pDevice->Clear( 1, &rec, D3DCLEAR_TARGET, color, 0, 0 );
}
Drawing it:
FillRGB(CenterX-15, CenterY, 30, 1,Red,pDevice);//Diagonal line
FillRGB(CenterX, CenterY-15, 1, 30,Red,pDevice);//Vertical line

//DrawCircle(XPosition,YPosition,Radius,numSides,Color);
Function:
void DrawCircle(int X, int Y, int radius, int numSides, DWORD Color) 
{ 

    D3DXVECTOR2 Line[128]; 
    float Step = PI * 2.0 / numSides; 
    int Count = 0; 
    for (float a=0; a < PI*2.0; a += Step) 
    { 
        float X1 = radius * cos(a) + X; 
        float Y1 = radius * sin(a) + Y; 
        float X2 = radius * cos(a+Step) + X; 
        float Y2 = radius * sin(a+Step) + Y; 
        Line[Count].x = X1; 
        Line[Count].y = Y1; 
        Line[Count+1].x = X2; 
        Line[Count+1].y = Y2; 
        Count += 2; 
    } 
    pLine->Begin(); 
    pLine->Draw(Line,Count,Color); 
    pLine->End(); 
}
Drawing it:
DrawCircle(CenterX,CenterY,8,8,Red);

//DrawPoint(XPosition,YPosition,Width,Height,Color);
Function:
void DrawPoint(int x, int y, int w, int h, DWORD color)
{
    FillRGB((int)x, (int)y, (int)w, (int)h, color);

} 
Drawing it:
DrawPoint(CenterX-1,CenterY-1, 1, 1, Green);

//DrawLine(XPosStart,YPosStart,XPosFinish,YPosFinish,Width,Color);
Function:
void DrawLine(float x, float y, float x2, float y2, float width, DWORD color)
{
    D3DXVECTOR2 vLine[2];
    pLine->SetWidth( width );
    pLine->SetAntialias( false );
    pLine->SetGLLines( true );
    vLine[0].x = x;
    vLine[0].y = y;
    vLine[1].x = x2;
    vLine[1].y = y2;
    pLine->Begin();
    pLine->Draw( vLine, 2, color );
    pLine->End();
}
Drawing it:
DrawLine(CenterX+10,CenterY+10,CenterX-10,CenterY-10,1,Red);
DrawLine(CenterX-10,CenterY+10,CenterX+10,CenterY-10,1,Red);

DrawCircle(CenterX,CenterY,8,8,Red);//Circle
FillRGB(CenterX-17, CenterY, 10, 1,Red,pDevice);//Left line
FillRGB(CenterX+9, CenterY, 10, 1,Red,pDevice); // Right line
FillRGB(CenterX, CenterY-17, 1, 10,Red,pDevice);//Top line
FillRGB(CenterX, CenterY+9, 1, 10,Red,pDevice);//Bottom line
DrawPoint(CenterX, CenterY, 1, 1, Green);//Dot point

FillRGB(CenterX-15, CenterY, 10, 1,Red,pDevice);//Left line
FillRGB(CenterX+6, CenterY, 10, 1,Red,pDevice);//Right line
FillRGB(CenterX, CenterY-15, 1, 10,Red,pDevice);//Top line
FillRGB(CenterX, CenterY+6, 1, 10,Red,pDevice);//Bottom line
DrawPoint(CenterX-1 , CenterY-1, 1, 1, Green);//Dot point

DrawCircle(CenterX-1,CenterY-1,8,8,Red);//Circle
FillRGB(CenterX-13, CenterY, 10, 1,Red,pDevice);//Left line
FillRGB(CenterX+4, CenterY, 10, 1,Red,pDevice);//Right line
FillRGB(CenterX, CenterY-13, 1, 10,Red,pDevice);//Top line
FillRGB(CenterX, CenterY+4, 1, 10,Red,pDevice);//Bottom line
DrawPoint(CenterX-1 , CenterY-1, 1, 1, Green);//Dot point

DrawLine(CenterX+15,CenterY+15,CenterX+3,CenterY+3,2,Red);// Bottom right to center
DrawLine(CenterX-15,CenterY+15,CenterX-3,CenterY+3,2,Red);//Bottom left to center
DrawLine(CenterX+15,CenterY-15,CenterX+3,CenterY-3,2,Red);//Top right to center
DrawLine(CenterX-15,CenterY-15,CenterX-3,CenterY-3,2,Red);//Top left to center
DrawPoint(CenterX,CenterY,1,1,Green);//Dot point

FillRGB(CenterX-20, CenterY, 40, 1,Purple,pDevice);//Purple
FillRGB(CenterX, CenterY-20, 1, 40,Purple,pDevice);

FillRGB(CenterX-17, CenterY, 34, 1,Blue,pDevice);//Blue
FillRGB(CenterX, CenterY-17, 1, 34,Blue,pDevice);

FillRGB(CenterX-14, CenterY, 28, 1,Cyan,pDevice);//Cyan
FillRGB(CenterX, CenterY-14, 1, 28,Cyan,pDevice);

FillRGB(CenterX-11, CenterY, 22, 1,Green,pDevice);//Green
FillRGB(CenterX, CenterY-11, 1, 22,Green,pDevice);

FillRGB(CenterX-9, CenterY, 18, 1,Yellow,pDevice);//Yellow
FillRGB(CenterX, CenterY-9, 1, 18,Yellow,pDevice);

FillRGB(CenterX-6, CenterY, 12, 1,Orange,pDevice);//Orange
FillRGB(CenterX, CenterY-6, 1, 12,Orange,pDevice);

FillRGB(CenterX-3, CenterY, 6, 1,Red,pDevice);//Red
FillRGB(CenterX, CenterY-3, 1, 6,Red,pDevice);