How to scroll text drawn with DrawText

[RichCini]

Hi --

I have an emulation project I've been working for a long time (the Altair32 Altair/IMSAI emulator) and I'm trying to simulate a dot-matrix printer for list output in CP/M.

Here's what I have so far and where I'm stuck and need a push in the right direction. I'm using a dialog box with a green bar paper bitmap as the client area background. I used CreateFont to load a dot matrix printer TrueType font and have the base code to print on subsequent lines. So, based on the dialog size, font size, etc., I get about 10 lines of dot matrix printing, 80-characters wide. So far so good.

The problem arises in how do I scroll the text like on a printer? I thought about trying a static text control or an edit box, but the text to be printed is of an unknown size and ISTR that both of those controls have finite size limits (32k but maybe I'm wrong). They would also need to be transparent so that the green bar paper shows through.

Any thoughts or ideas would be greatly apprciated. Thanks!

Rich
http://www.classiccmp.org/cini
http://www.classiccmp.org/altair32

[VladimirF]

The problem arises in how do I scroll the text like on a printer? I thought about trying a static text control or an edit box, but the text to be printed is of an unknown size and ISTR that both of those controls have finite size limits (32k but maybe I'm wrong). They would also need to be transparent so that the green bar paper shows through.

Check out ScrollWindow function.

[RichCini]

Vladimir --

Thanks. I don't know if this matters, but the dialog doesn't presently have scroll bars. I'll give ScrollWindow a try and see what I get.

Thanks again!
Rich

[Igor Vartanov]

Here's what I have so far and where I'm stuck and need a push in the right direction. I'm using a dialog box with a green bar paper bitmap as the client area background. I used CreateFont to load a dot matrix printer TrueType font and have the base code to print on subsequent lines. So, based on the dialog size, font size, etc., I get about 10 lines of dot matrix printing, 80-characters wide. So far so good.

The problem arises in how do I scroll the text like on a printer?

You do that precisely like CP/M did: you re-paint the whole window and fill it with the text output based on the newly changed top left position in your text buffer.