scrolling text in directx 11

[FangedHavoc]

I am trying to get the text to move on screen by repositioning the x value of the rendered text, but unfortunately I keep loading the program to find the text remains in the same position that it was originally rendered in. I was hoping someone my see something that I am not and could help me to find the problem with the below code.

bool D3DTextDemo::DrawString( char* message, float startX, float startY )
{

    // Size in bytes for a single sprite.
    const int sizeOfSprite = sizeof( VertexPos ) * 6;

    // Demo's dynamic buffer setup for max of 24 letters.
    const int maxLetters = 24;

    int length = strlen( message );

    // Clamp for strings too long.
    if( length > maxLetters )
        length = maxLetters;

    // Char's width on screen.
    float charWidth = 32.0f / 800.0f;

    // Char's height on screen.
    float charHeight = 32.0f / 640.0f;
    
    // Char's texel width.
    float texelWidth = 32.0f / 864.0f;

    // verts per-triangle (3) * total triangles (2) = 6.
    const int verticesPerLetter = 6;

    D3D11_MAPPED_SUBRESOURCE mapResource;
    HRESULT d3dResult = d3dContext_->Map( vertexBuffer_, 0, D3D11_MAP_WRITE_DISCARD, 0, &mapResource );

    if( FAILED( d3dResult ) )
    {
        DXTRACE_MSG( "Failed to map resource!" );
        return false;
    }

    // Point to our vertex buffer's internal data.
    VertexPos *spritePtr = ( VertexPos* )mapResource.pData;

    const int indexA = static_cast<char>( 'A' );
    const int indexZ = static_cast<char>( 'Z' );

    for( int i = 0; i < length; ++i )
    {
        float thisStartX = startX + ( charWidth * static_cast<float>( i ) );
        float thisEndX = thisStartX + charWidth;
        float thisEndY = startY + charHeight;

        spritePtr[0].pos = XMFLOAT3( thisEndX,   thisEndY, 1.0f );
        spritePtr[1].pos = XMFLOAT3( thisEndX,   startY,   1.0f );
        spritePtr[2].pos = XMFLOAT3( thisStartX, startY,   1.0f );
        spritePtr[3].pos = XMFLOAT3( thisStartX, startY,   1.0f );
        spritePtr[4].pos = XMFLOAT3( thisStartX, thisEndY, 1.0f );
        spritePtr[5].pos = XMFLOAT3( thisEndX,   thisEndY, 1.0f );

        int texLookup = 0;
        int letter = static_cast<char>( message[i] );

        if( letter < indexA || letter > indexZ )
        {
            // Grab one index past Z, which is a blank space in the texture.
            texLookup = ( indexZ - indexA ) + 1;
        }
        else
        {
            // A = 0, B = 1, Z = 25, etc.
            texLookup = ( letter - indexA );
        }

        float tuStart = 0.0f + ( texelWidth * static_cast<float>( texLookup ) );
        float tuEnd = tuStart + texelWidth;

        spritePtr[0].tex0 = XMFLOAT2( tuEnd, 0.0f );
        spritePtr[1].tex0 = XMFLOAT2( tuEnd, 1.0f );
        spritePtr[2].tex0 = XMFLOAT2( tuStart, 1.0f );
        spritePtr[3].tex0 = XMFLOAT2( tuStart, 1.0f );
        spritePtr[4].tex0 = XMFLOAT2( tuStart, 0.0f );
        spritePtr[5].tex0 = XMFLOAT2( tuEnd, 0.0f );

        spritePtr += 6;
    }

    d3dContext_->Unmap( vertexBuffer_, 0 );
    d3dContext_->Draw( 6 * length, 0 );

    return true;
}

void D3DTextDemo::Update( float dt)
{
	updateX = -1.0f;

	

	int i = 0;

	for( i = 0; i >= 48; i++)
	{
		DrawString( "HELLO WORLD", updateX, 1.0f );
		updateX = updateX + (i * 0.01f);
	}
}

void D3DTextDemo::Render( )
{
    if( d3dContext_ == 0 )
        return;

    float clearColor[4] = { 0.2f, 0.22f, 0.24f, 1.0f };
    d3dContext_->ClearRenderTargetView( backBufferTarget_, clearColor );

    unsigned int stride = sizeof( VertexPos );
    unsigned int offset = 0;

    d3dContext_->IASetInputLayout( inputLayout_ );
    d3dContext_->IASetVertexBuffers( 0, 1, &vertexBuffer_, &stride, &offset );
    d3dContext_->IASetPrimitiveTopology( D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST );

    d3dContext_->VSSetShader( solidColorVS_, 0, 0 );
    d3dContext_->PSSetShader( solidColorPS_, 0, 0 );
    d3dContext_->PSSetShaderResources( 0, 1, &colorMap_ );
    d3dContext_->PSSetSamplers( 0, 1, &colorMapSampler_ );

	DrawString( "HELLO WORLD", -1.0, 0.0f );

    swapChain_->Present( 0, 0 );
}

Thanks in advance for any help.