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SnappyLine -- Draw Lines with Text Label at Any Angle

SnappyLine -- Draw Lines with Text Label at Any Angle

Post by Earl F. Glyn » Mon, 07 Dec 1998 04:00:00



Gordon Whittam contributed a very interesting "Snappy Line" project to my Computer Lab.

With the SnappyLine program you can draw "free" lines, which are lines that snap to each other and measure angles.  Lines can be
highlighted with a trackbar and erased when the trackbar is released. SnappyLine also demonstrates the creation of a LogFont for
drawing the text dimensions at any angle.

Take a look at the Snappy Line Lab Report at
www.efg2.com/lab/Graphics/SnappyLine.htm

efg
_________________________________
efg's Computer Lab:       www.efg2.com/lab
Delphi Books:  www.efg2.com/lab/TechBooks/Delphi.htm


Overland Park, KS  USA

 
 
 
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1. how can I draw labels in angle ?

I have to draw on screen over 1000 labels , in different angles, this angels
might change.
I have the follow code in a BCB4s Timer
LOGFONT logfont;
...
for(int i = 0; i < 1000; i++)
{
    logfont.lfEscapement = ANGLE(i);
    HFONT font = CreateFontIndirect(&logfont);
    Canvas->Font->Handle = font;
    Canvas->TextOut(X,Y,TEXT);
    DeleteObject(font);

It takes a long time to draw all labels (Aprox. 2 Sec.)

Could someone help me.

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