<marcin.rzeznicki@gmail.com> wrote in message
news:1140885779.228201.123360@v46g2000cwv.googlegroups.com...
> Hello,
> I am in need to find specific point in region. To be exact:
> Suppose, we have region like the one below
>
> __________
> | _____|
> | |
> | |
> _____* <- this is the point (*) I am looking for, if one thought of
> region as a block of lines and attached to each line bounding rectangle
> then the point would be at (rectangle.Right, Rectangle.Top)
>
> Another example could be:
>
> ______________
> | |
> | |
> _____________* <- (this is the point) This case could be analyzed in
> the same way as the one above, yielding point marked with *
>
> I tried to win the problem with using GetRegionScans and computing the
> point by comapring by procedure like:
>
> RectangleF bounds = region.GetBounds(graphics);
>
> if (char.IsWhiteSpace(lastCharInRegion))
> {
> if (lastCharInRegion == '\n')
> return new PointF(bounds.X, bounds.Bottom);
> }
>
> float highestX = float.MinValue;
> float lowestY = float.MaxValue;
> foreach(RectangleF rectangle in
> region.GetRegionScans(transformation))
> {
> if (rectangle.Bottom == bounds.Bottom)
> {
> highestX = Math.Max(higestX, rectangle.Right);
> lowestY = Math.Min(lowestY, rectangle.Top);
> }
> }
> return new PointF(highestX, lowestY);
>
> but hte procedure works only if hard assumptions are taken:
> GetRegionScans returns rectangles horizontally ordered, and each
> rectangle has height of imaginary line - which might not be the case as
> documentation do not specify any ordering or properties of returned
> rectangles. Also, I've heard of GetRegionScnas bug which distracted me
> from using it.
> Another approach I thought of would not use any region at all, except
> ectangular ones (regions are returned from MeasureCharacterRegions
> method, so it is easy to achieve), but I am quite sure it would have
> made my procedure less effective.
> What is the best solution to my problem, in your opinion?
>

> You're pretty much on the right track. 1.1 does have a bug in GetRegionScans
> but this has been fixed in 2.0.
>
> If you can use VS2005 then the technique will work just fine.
>

<marcin.rzeznicki@gmail.com> wrote in message
news:1141038496.639826.134860@j33g2000cwa.googlegroups.com...
>
> Bob Powell [MVP] napisal(a):
>> You're pretty much on the right track. 1.1 does have a bug in
>> GetRegionScans
>> but this has been fixed in 2.0.
>>
>> If you can use VS2005 then the technique will work just fine.
>>
>
> Unfortunately, I cannot :-( Is memory leak in GetRegionScans very
> serious?
> I am trying to write something like text editor, region I described is
> block of text with constant properties like font style etc, the point I
> seek would mark beginning of next text block. Assuming memory leak is
> very serious - would you recommend scanning text "line by line" which
> would give me only rectangular regions (possible loss of efficiency)?
> I've also read some discussions which recommend leaving GDI+ in favour
> of GDI when it comes to text rendering, could that be right choice for
> .NET application?
> By the way, your GDI+ faq is awesome :-) Thank you for your answer.
>