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## Re: about contibuting to octave

 From: Ben Abbott Subject: Re: about contibuting to octave Date: Thu, 12 Mar 2009 16:53:12 +0800

```
On Mar 11, 2009, at 2:37 PM, xianghang liu wrote:

```
Two functions below are two methods of computing bounding box of a text object. I wrote them following algorithms used in GD and Freetype. Only a slight diiference is between them. It is the computation of bounding box of a charachter. And the final result of them are slightly different as well.
```Please tell me if you find any mistakes or have suggestions.
```
```
```
I'm confused by what is meant by "bounding box", and as I'm unfamiliar with FreeType (and have poor c++ skills) I'm uncertain that this implementation will result in what is expected for the text object property, "extent".
```
Consider the three examples below (from Matlab).

```
>> h1 = text(0,0,'_','interpreter','none','units','points','fontsize', 12); >> h2 = text(0,0,'|','interpreter','none','units','points','fontsize', 12); >> h3 = text(0,0,'-','interpreter','none','units','points','fontsize', 12);
```>> get(h1,'extent')

ans =

0         -8.8          8.8           16

>> get(h2,'extent')

ans =

0         -8.8          5.6           16

>> get(h3,'extent')

ans =

0         -8.8          6.4           16

```
The choice of character only impacts the width of the extent. The lower left corner and height of the extent is constant.
```
```
Does your implementation produce such a result, or does it produce a bounding box representing the smallest box that encompasses the text object?
```
Ben

```

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