On Tue, 2008-10-14 at 21:25 +0800, yang zhiyuan wrote:
> Hi:
> I have solved the problem how to get one char's position inside a
> osgText::Text;
> The purpose is to move cursor when input text.
>
> Here is my code:
> updateCursorPos(const std::string& string, int position)
> {
> osg::Vec3 cursor_position = m_inputText->getPosition();
> //get the font resolution
> osgText::FontResolution fr;
> fr.first = FONT_RES_X;
> fr.second = FONT_RES_Y;
>
> //m_inputText is the osg::Text from which you want to get the last
> char's position
> const osgText::Font* font = m_inputText->getFont();
> osgText::Font* font1 = const_cast<osgText::Font*>(font);
> //get total size of input parameter string
> //string is the the std::string inside the m_inputText
> unsigned int size = string.size();
> osgText::Font::Glyph* glyph = font1->getGlyph(fr,size-1);
> osgText::Font::GlyphTexture* glyphTexture = glyph->getTexture();
>
> const osgText::Text::GlyphQuads * glyph_quads =
> m_inputText->getGlyphQuads( glyphTexture );
> if( glyph_quads )
> {
> int coord_size = glyph_quads->getTransformedCoords(0).size();
> int input_text_size = string.size(); // # chars on line.
> if( position > 0 )
> {
> // Get position of character under cursor
> // There are 4 coords per character, BottomLeft, TopLeft,
> // BottomRight, TopRight. We want the BottomRight.
> osg::Vec3 glyph_pos =
> glyph_quads->getTransformedCoords(0)[ position * 4 - 2 ];
> cursor_position[0] = glyph_pos[0]; // Use only the X
> position
> }
> }
>
> }
I'm going to try and adapt this to osgWidget::Input. Right now I use a
much different method for calculating the cursor position of my Input
object (which doesn't work), so perhaps this will help. I will, of
course, post more info soon. :)
On a different note--are you writing your own widget library?
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