Re: [osg-users] text appearing flipped and backwards
Hi,
have you created your own viewmatrix?
I assume the red text is just photoshopped in, right?
Peter
http://osghelp.com
On Fri, Jul 18, 2008 at 10:49 PM, James Dickson [EMAIL PROTECTED]
wrote:
Hi,
I am having an issue with osgText::Text in that the text appears flipped
and backwards relative to the other geometry in the scene. (Please see
screenshot for what I mean)
In the attached screen shot I have written on the coords. of the billboard
geometry so hopefully the following code will make some sense:
// Go through data and plot lines.
for (_i = _testTimeLine.begin(); _i != _testTimeLine.end(); ++_i)
{
std::stringstream _caption;
_caption *_j;
int _y = static_castint(((*_j) + _minY) *
((
_height - 20) / (_maxY - _minY)));
int _x = static_castint(((*_i) + _minX) *
((
_width - 20) / (_maxX - _minX)));
_x = _x + 10;
_y = _y + 10;
// If not at the beginning of the vector, draw a line, otherwise
// colour a pixel.
if (_i != _testTimeLine.begin())
{
m_graphImage-DrawLine(osg::Vec2(_prevx, _prevy),
osg::Vec2(_x, _y),
osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f));
}
else
{
m_graphImage-SetPixel(osg::Vec2(_x, _y),
osg::Vec3(0.0f, 0.0f, 1.0f));
}
_prevx = _x;
_prevy = _y;
// Convert texture coordinates to uv's to use as offsets.
float _u = ((float)_x) / ((float)_width);
float _v = ((float)_y) / ((float)_height);
osg::Vec3 _xoffset(_u, 0.0f, 0.0f);
osg::Vec3 _zoffset(0.0f, 0.0f, _v);
// Use offsets to create world space coordinates.
osg::Vec3 _pos = m_corner + _xoffset + _yoffset
+
_zoffset;
// Create and position text displaying data point value.
osgText::Text * _text = new osgText::Text;
_text-setFont(_font);
_text-setCharacterSize(characterSize);
_text-setPosition(_pos);
_text-setAxisAlignment(osgText::Text::XZ_PLANE);
_text-setText(_caption.str());
_captions-addDrawable(_text);
++
_j;
}
I have managed to fix it by changing the alignment setting to
REVERSE_XZ_PLANE and switching the sign of the offset coords. However I feel
this is a slight hack and wondered if there is some other 'proper' setting?
Many thanks,
James
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--
Regards,
Peter Wraae Marino
www.osghelp.com - OpenSceneGraph support site
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Re: [osg-users] text appearing flipped and backwards
The red text is photoshopped in, and I have not created my own view matrix.
2008/7/19 Peter Wraae Marino [EMAIL PROTECTED]:
Hi,
have you created your own viewmatrix?
I assume the red text is just photoshopped in, right?
Peter
http://osghelp.com
On Fri, Jul 18, 2008 at 10:49 PM, James Dickson [EMAIL PROTECTED]
wrote:
Hi,
I am having an issue with osgText::Text in that the text appears flipped
and backwards relative to the other geometry in the scene. (Please see
screenshot for what I mean)
In the attached screen shot I have written on the coords. of the billboard
geometry so hopefully the following code will make some sense:
// Go through data and plot lines.
for (_i = _testTimeLine.begin(); _i != _testTimeLine.end(); ++_i)
{
std::stringstream _caption;
_caption *_j;
int _y = static_castint(((*_j) + _minY) *
((
_height - 20) / (_maxY - _minY)));
int _x = static_castint(((*_i) + _minX) *
((
_width - 20) / (_maxX - _minX)));
_x = _x + 10;
_y = _y + 10;
// If not at the beginning of the vector, draw a line, otherwise
// colour a pixel.
if (_i != _testTimeLine.begin())
{
m_graphImage-DrawLine(osg::Vec2(_prevx, _prevy),
osg::Vec2(_x, _y),
osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f));
}
else
{
m_graphImage-SetPixel(osg::Vec2(_x, _y),
osg::Vec3(0.0f, 0.0f, 1.0f));
}
_prevx = _x;
_prevy = _y;
// Convert texture coordinates to uv's to use as offsets.
float _u = ((float)_x) / ((float)_width);
float _v = ((float)_y) / ((float)_height);
osg::Vec3 _xoffset(_u, 0.0f, 0.0f);
osg::Vec3 _zoffset(0.0f, 0.0f, _v);
// Use offsets to create world space coordinates.
osg::Vec3 _pos = m_corner + _xoffset + _yoffset
+
_zoffset;
// Create and position text displaying data point value.
osgText::Text * _text = new osgText::Text;
_text-setFont(_font);
_text-setCharacterSize(characterSize);
_text-setPosition(_pos);
_text-setAxisAlignment(osgText::Text::XZ_PLANE);
_text-setText(_caption.str());
_captions-addDrawable(_text);
++
_j;
}
I have managed to fix it by changing the alignment setting to
REVERSE_XZ_PLANE and switching the sign of the offset coords. However I feel
this is a slight hack and wondered if there is some other 'proper' setting?
Many thanks,
James
___
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
--
Regards,
Peter Wraae Marino
www.osghelp.com - OpenSceneGraph support site
___
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
--
James Dickson
___
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