SetScrollSizes is cauing pinch.

adityarao31

I have written SetScrollSizes function for my class derived from CScrollView in OnInitUpdate. But it is giving me big pinch. I have to read one text file from disk and diaplay as it is by changing font. I created font and I am displaying it. // code fragment. sizeTotal.cx = Linelength //calculated and fine. sizeTotal.cy = Numlines * cyChar; where cyChar = tm.tmHeight + tm.tmExternalLeading; SetScrollSizes(MM_TEXT,sizeTotal); But during display I find scroll is too huge than my file and scrolling is very fast than required. If file would have of constant size I might have hardcoded but sometimes it is just four lines and some time tens of thousands. Can any one tell me. I checked current mapping mode of device context ,it is MM_TEXT. muktoham

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Nelek

I think the problem is that the size of the font (vertical points) is not matching the vertical real size in pixels. I mean: a font 8 is not 8 pixels height. Edit: Just make a test. Declare a Font of 8 or 10 or 12 (whatever you want), then make a TextOut at (10,50) and another at (10, 50 + Font size) you will see that doesn't match) So the thing is that you should calculate aprox the coeficient you need for a line in pixels of MM_TEXT

Greetings. -------- M.D.V. ;) If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about? Help me to understand what I'm saying, and I'll explain it better to you “The First Rule of Program Optimization: Don't do it. The Second Rule of Program Optimization (for experts only!): Don't do it yet.” - Michael A. Jackson

modified on Monday, May 19, 2008 1:57 PM

adityarao31 · modified on Monday, May 19, 2008 1:57 PM

Thanks I will check it tomorrow and will tell you,but it seems right,if I will practically find font height pixels everything will get solved.

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