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Writing on the screen and scroll a number of pixel?

Posted on 2003-03-25
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Last Modified: 2013-11-20
Is it possible to change the color and size of the font when one is writing on an MDI? If so, can anyone tell me how to do it?

Secondly, When I click on a (vertical) scroll bar I want the application to move 300 pixel down ( still with my MDI application), how can I do this?

Please help.

Neo
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Question by:NeoMind
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6 Comments
 
LVL 31

Expert Comment

by:Zoppo
ID: 8210175
Hi NeoMind,

both depend on the type of view which you use in your MDI app:

I.e. in a CScrollView-derived view you can set the logical
size of the document-view with CScrollView::SetScrollSizes().
In the overridden OnDraw of the view you can draw to logical
coordinates Text of any font-type/size/color ...
for every font-type/size you need to create a new font with
i.e. CFont::CreateFont, CFont::CreatePointFont a.o. and
select this new font into the current DC via CDC::SelectObject.
You can use CDC::SetTextColor() to change the color of the font,
further you can set the text's backgroundcolor using CDC::SetBkColor().
And you can set the text-drawing mode with CDC::SetBkMode()
to TRANSPARENT or OPAQUE.

Take care that you need to select the formerly selected objects
back into the dc before you return from OnDraw, i.e.:

CMyView::OnDraw( CDC* pDC )
{
 CFont myFont;
 myFont.CreatePointFont( 120, "Times New Roman", pDC );
 CFont* pOldFont = pDC->SelectObject( &myFont );
 // draw text here with CDC::TextOut or CDC::DrawText(Ex)
 ...
 pDC->SelectObject( pOldFont ); // never forget this
}

hope that helps,

ZOPPO
0
 

Author Comment

by:NeoMind
ID: 8216288
Thank u ZOPPO,

The view class that I am using is:

CprogView  and it is derived from CScrollView.

But how do I set the number of pixel such that when I click on the scroll bar it moves down by, say, 300 pixel.

NeoMind
0
 
LVL 31

Accepted Solution

by:
Zoppo earned 200 total points
ID: 8216968
With CScrollView::SetScrollSizes you can pass a page-size and
a line-size. The page-size defines the step to scroll when
the scrollbar is clicked between the thumb and arrows. The
line-size defines the step to scroll when clicking on
the arrows.

I.e.:

CMyView::OnInitialUpdate()
{
 ...
 CSize sizeTotal( 1000, 1000 ); // the size of the logical view in logical coordinates
 CSize sizePage( 300, 300 ); // the logical size of one page-scroll
 CSize sizeLine( 15, 15 ); // the logical size of one line-scroll

 SetScrollSizes( MM_TEXT, sizeTotal, sizePage, sizeLine );
}

I use MM_TEXT here because it's the simpliest: logical coordinates
are pixels so you don't need to calculate lengths between
logical and device coordinate (you still need to convert
points because of the different origin depending on the
scroll).

ZOPPO
0

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