Change text height and pragraph indent in text block

Question

I am trying to create a title page for my thesis. I did this code with the help of friends on this site. Now I have a new problem. In my code I want to change the text height and line spacing in only one text block (last block). And also I want to include a paragraph indent in this block. Or can I write a normal text in here but it must start 26.5 cm below the top of the page? Could you show me a way to do this?

\documentclass{book}
\usepackage[turkish]{babel}%türkçe karakter
\usepackage[utf8]{inputenc}
\usepackage{textpos}

\newcommand{\fromtop}[1]{%
\dimexpr-1in-\topskip-\topmargin-\headheight-\headsep+#1\relax
 }
\newcommand{\fromleft}[1]{%
\dimexpr-1in-\oddsidemargin+#1\relax
}

\begin{document}

\begin{titlepage}
\setlength{\parindent}{0pt}

\begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{3cm})
\centering
    \textbf{ASDGGSDFG ÜNİVERSİTESİ\\
    DASDGG ENSTİTÜSÜ}
\end{textblock*}

\begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{6.5cm})
\centering
\textbf{DHFGHDH ANABİLİM DALI}
\end{textblock*}

\begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{9.5cm})
\centering
\textbf{ASGFHFDHDGH\\
DFHSGFHDFHG}
\end{textblock*}

\begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{15cm})
\centering
\textbf{DOKTORA TEZİ}
\end{textblock*}

\begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{16cm})
\centering
    \textbf{adgdfhf}\\
    \textbf{124356}
\end{textblock*}

\begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{19.5cm})
\centering
    \textbf{Tezin Savunma Tarihi    : 00.00.0000}
\end{textblock*}

\begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{23cm})
\centering
    \textbf{Tez Danışmanı   : asdf}
\end{textblock*}

\begin{textblock*}{\paperwidth}(\fromleft{4cm},\fromtop{26.5cm})
Bu Yüksek Lisans/Doktora Tez Çalışması FDGSDFGHH Üniversitesi\\………………’nolu        Proje ile desteklenmiştir.
\end{textblock*}

\end{titlepage}

\end{document}

Answer 1

Here's a way to indent the final block by limiting the scope of the \setlength{\parindent}{0pt} and adding an explicit skip at the start.

\documentclass{book}
\usepackage[turkish]{babel}%türkçe karakter
\usepackage[utf8]{inputenc}
\usepackage{textpos}
\newcommand{\fromtop}[1]{\dimexpr-1in-\topskip-\topmargin-\headheight-\headsep+#1\relax}
\newcommand{\fromleft}[1]{\dimexpr-1in-\oddsidemargin+#1\relax}
\begin{document}

\begin{titlepage}

    \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{3cm})
      \centering
      \textbf{ASDGGSDFG ÜNİVERSİTESİ\\
        DASDGG ENSTİTÜSÜ}
    \end{textblock*}

    \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{6.5cm})
      \centering
      \textbf{DHFGHDH ANABİLİM DALI}
    \end{textblock*}

    \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{9.5cm})
      \centering
      \textbf{ASGFHFDHDGH\\
        DFHSGFHDFHG}
    \end{textblock*}

    \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{15cm})
      \centering
      \textbf{DOKTORA TEZİ}
    \end{textblock*}

    \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{16cm})
      \centering
      \textbf{adgdfhf}\\
      \textbf{124356}
    \end{textblock*}

    \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{19.5cm})
      \centering
      \textbf{Tezin Savunma Tarihi    : 00.00.0000}
    \end{textblock*}

    \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{23cm})
      \centering
      \textbf{Tez Danışmanı   : asdf}
    \end{textblock*}%

  \begin{textblock*}{\paperwidth}(\fromleft{4cm},\fromtop{26.5cm})
    \hskip \parindent Bu Yüksek Lisans/Doktora Tez Çalışması FDGSDFGHH Üniversitesi\\………………’nolu        Proje ile desteklenmiştir.
  \end{textblock*}

\end{titlepage}

\end{document}

If you need to alter the spacing of the text within this block, you could load the setspace package. You can then use

\begin{singlespace}
  <content>
\end{singlespace}

\begin{onehalfspace}
  <content>
\end{onehalfspace}

\begin{doublespace}
  <content>
\end{doublespace}

for single, 1.5 and double spacing or

\begin{spacing}{<whatever>}
  <content>
\end{spacing}

if you need a different value.

It is not clear what you mean by changing the text height. The \textheight is the height of the entire text block i.e. everything except the margins, so obviously cannot be changed for only part of a page.

EDIT

I'm still not entirely clear how the last block should be formatted. Do you want something like the following?

The final block here is formatted like this:

  \begin{textblock*}{\paperwidth-80mm}(\fromleft{4cm},\fromtop{26.5cm})
    \begin{doublespace}
      \large Bu Yüksek Lisans/Doktora Tez Çalışması FDGSDFGHH Üniversitesi\\………………’nolu        Proje ile desteklenmiştir.
    \end{doublespace}
  \end{textblock*}

As mentioned by egreg, we can actually drop the zeroing of the \parindent as all blocks except the last are centred anyway. So we can just let the natural paragraph indentation indent the first line.

\large increases the font size, relative to the document default.

Changing the width of the text block ensures that it has 4cm indentation on both the left and right sides of the page.

Complete code:

\documentclass{book}
\usepackage[turkish]{babel}%türkçe karakter
\usepackage[utf8]{inputenc}
\usepackage{textpos,calc,setspace}
\newcommand{\fromtop}[1]{\dimexpr-1in-\topskip-\topmargin-\headheight-\headsep+#1\relax}
\newcommand{\fromleft}[1]{\dimexpr-1in-\oddsidemargin+#1\relax}
\begin{document}

\begin{titlepage}
  \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{3cm})
    \centering
    \textbf{ASDGGSDFG ÜNİVERSİTESİ\\
      DASDGG ENSTİTÜSÜ}
  \end{textblock*}
  \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{6.5cm})
    \centering
    \textbf{DHFGHDH ANABİLİM DALI}
  \end{textblock*}
  \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{9.5cm})
    \centering
    \textbf{ASGFHFDHDGH\\
      DFHSGFHDFHG}
  \end{textblock*}
  \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{15cm})
    \centering
    \textbf{DOKTORA TEZİ}
  \end{textblock*}
  \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{16cm})
    \centering
    \textbf{adgdfhf}\\
    \textbf{124356}
  \end{textblock*}
  \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{19.5cm})
    \centering
    \textbf{Tezin Savunma Tarihi    : 00.00.0000}
  \end{textblock*}
  \begin{textblock*}{\paperwidth}(\fromleft{0cm},\fromtop{23cm})
    \centering
    \textbf{Tez Danışmanı   : asdf}
  \end{textblock*}%
  \begin{textblock*}{\paperwidth-80mm}(\fromleft{4cm},\fromtop{26.5cm})
    \begin{doublespace}
      \large Bu Yüksek Lisans/Doktora Tez Çalışması FDGSDFGHH Üniversitesi\\………………’nolu        Proje ile desteklenmiştir.
    \end{doublespace}
  \end{textblock*}
\end{titlepage}

\end{document}