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Rotated Text, Save Bitmap

 
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dsimcha



Joined: 24 Oct 2008
Posts: 16
PostPosted: Tue Jul 06, 2010 9:55 pm    Post subject: Rotated Text, Save Bitmap Reply with quote
I'm working on a plotting library using DFL for basic GUI functionality. Right now, some (very) basic functionality is working, but I'm hung up on trying to make two things work.

First, how does one get rotated text of the type that would be appropriate for the y-axis label of a graph?

Secondly, how does one get access to the underlying bits of a Bitmap to, for example, write the image out to a file?

Thanks in advance.
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Chris Miller



Joined: 27 Mar 2004
Posts: 514
Location: The Internet
PostPosted: Thu Jul 08, 2010 10:37 pm    Post subject: Re: Rotated Text, Save Bitmap Reply with quote
To rotate text, you could write the text normally into a temporary bitmap, and then rotate the pixels as you copy them to where you want it.

DFL doesn't directly have a way to get the pixel data of a Bitmap (yet). You could take a look at h3r3tic's DrawingArea addon. Here's a list of GDI functions* like GetDIBits you might be interested in, you can use with Bitmap.handle.

* http://msdn.microsoft.com/en-us/library/dd183385(v=VS.85).aspx (not linkable or clickable)
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dsimcha



Joined: 24 Oct 2008
Posts: 16
PostPosted: Sat Jul 10, 2010 10:51 pm    Post subject: Re: Rotated Text, Save Bitmap Reply with quote
Chris Miller wrote:
To rotate text, you could write the text normally into a temporary bitmap, and then rotate the pixels as you copy them to where you want it.


I thought of this, but I couldn't figure out how to implement it. Is there a DFL API to rotate the pixels of a Bitmap object, or would I have to mess w/ the Win32 API directly? It doesn't appear to be do-able from Graphics.copyTo.
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dsimcha



Joined: 24 Oct 2008
Posts: 16
PostPosted: Sat Jul 24, 2010 1:50 pm    Post subject: Reply with quote
Here's some code that does rotated text. It's buggy in terms of text measuring/wrapping, but it's better than nothing and serves the purposes of my plotting lib. Could you please fold it into the next release of DFL in drawing.d so I can stop requiring users of Plot2Kill (my plotting library) that use the DFL backend to patch DFL?

Code:


// This implements rotated fonts.  Thanks to Robert Jacques for the code.
class RFont : Font {
    /// ditto
    this(Dstring, float emSize, FontStyle style = FontStyle.REGULAR,
        GraphicsUnit unit = GraphicsUnit.POINT)
    {
        this(name, emSize, style, unit, DEFAULT_CHARSET, FontSmoothing.DEFAULT);
    }


    /// ditto
    this(Dstring name, float emSize, FontStyle style,
        GraphicsUnit unit, FontSmoothing smoothing)
    {
        this(name, emSize, style, unit, DEFAULT_CHARSET, smoothing);
    }

    // /// ditto
    // This is a somewhat internal function.
    // -gdiCharSet- is one of *_CHARSET from wingdi.h
    this(Dstring name, float emSize, FontStyle style,
        GraphicsUnit unit, ubyte gdiCharSet,
        FontSmoothing smoothing = FontSmoothing.DEFAULT)
    {
        LogFont lf;

        _unit = unit;

        lf.faceName = name;

        lf.lf.lfEscapement  = 900;
        lf.lf.lfOrientation = 900;

        lf.lf.lfHeight = -getLfHeight(emSize, unit);
        _style(lf, style);

        lf.lf.lfCharSet = gdiCharSet;
        lf.lf.lfOutPrecision = OUT_DEFAULT_PRECIS;
        lf.lf.lfClipPrecision = CLIP_DEFAULT_PRECIS;
        //lf.lf.lfQuality = DEFAULT_QUALITY;
        lf.lf.lfQuality = cast(BYTE) smoothing;
        lf.lf.lfPitchAndFamily = DEFAULT_PITCH | FF_DONTCARE;

        super(_create(lf));

        _fstyle = style;
        _initLf(lf);
    }
}
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Chris Miller



Joined: 27 Mar 2004
Posts: 514
Location: The Internet
PostPosted: Tue Jul 27, 2010 7:47 pm    Post subject: Reply with quote
How about this, I added an overload to the Font constructor in subversion for now that lets you customize the LogFont:
Code:
this(ref LogFont lf, float emSize, FontStyle style, GraphicsUnit unit)
so you could use this to keep RFont in your project and use the new Font constructor.
If it's good I'll include it in the next snapshot and release.
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dsimcha



Joined: 24 Oct 2008
Posts: 16
PostPosted: Wed Jul 28, 2010 1:34 pm    Post subject: Reply with quote
Chris Miller wrote:
How about this, I added an overload to the Font constructor in subversion for now that lets you customize the LogFont:
Code:
this(ref LogFont lf, float emSize, FontStyle style, GraphicsUnit unit)
so you could use this to keep RFont in your project and use the new Font constructor.
If it's good I'll include it in the next snapshot and release.


That sounds great.
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