Hello, I have written these few lines of code which allow setting the label of an osgWidget::Label with an osgText::String. I had to do this on a project I'm working on, because I needed UTF-8 strings on my labels, and using setLabel with std::string was not working.
Regards, -- César L. B. Silveira
Label
Description: Binary data
// -*-c++-*- osgWidget - Code by: Jeremy Moles (cubicool) 2007-2008
#include <osg/Math>
#include <osgWidget/WindowManager>
#include <osgWidget/Label>
namespace osgWidget {
Label::Label(const std::string& name, const std::string& label):
Widget (name, 0, 0),
_text (new osgText::Text()),
_textIndex (0) {
_text->setAlignment(osgText::Text::LEFT_BOTTOM);
_text->setDataVariance(osg::Object::DYNAMIC);
if(label.size()) {
_text->setText(label);
_calculateSize(getTextSize());
}
// TODO: Make a patch for this!
// If you're wondering why we don't use this let me explain...
//
// _text->setAlignment(osgText::Text::CENTER_CENTER);
//
// When you set the position of an osgText::Text object which has a CENTER_CENTER
// alignment, the internal implementation of osgText may give it values that have
// a "decimal" portion, which is NO GOOD on orthographic 2D displays where we
// want "pixel perfect" ratios. Thus, until I can remedy this internally with
// osgText::Text, I will need to calculate the center myself.
setColor(0.0f, 0.0f, 0.0f, 0.0f);
}
Label::Label(const Label& label, const osg::CopyOp& co):
Widget (label, co),
_textIndex (label._textIndex) {
_text = new osgText::Text(*label._text, co);
}
void Label::_calculateSize(const XYCoord& size) {
// if(size.x() && size.y()) setMinimumSize(size.x(), size.y());
if(getWidth() < size.x()) setWidth(size.x());
if(getHeight() < size.y()) setHeight(size.y());
}
// TODO: This will almost certainly get out of sync. :(
void Label::parented(Window* parent) {
osg::Geode* geode = parent->getGeode();
// If we've been cloned, use the index of the old text Drawable if it's already there.
// However, we have a problem here: imagine a Label gets cloned AFTER being added to
// a Window; it'll have a _textIndex, but that _textIndex won't apply to the
// currently cloned object. In this case, we'll need to check to be SURE.
osgText::Text* text = dynamic_cast<osgText::Text*>(geode->getDrawable(_textIndex));
if(text) parent->getGeode()->setDrawable(_textIndex, _text.get());
// Otherwise, add it as new.
else _textIndex = parent->addDrawableAndGetIndex(_text.get());
}
void Label::unparented(Window* parent) {
if(_textIndex) parent->getGeode()->removeDrawable(_text.get());
_textIndex = 0;
}
void Label::positioned() {
XYCoord size = getTextSize();
point_type x = osg::round(((getWidth() - size.x()) / 2.0f) + getX());
point_type y = osg::round(((getHeight() - size.y()) / 2.0f) + getY());
point_type z = _calculateZ(getLayer() + 1);
// These values are permisable with CENTER_CENTER mode is active.
// point_type x = round(getX() + (getWidth() / 2.0f));
// point_type y = round(getY() + (getHeight() / 2.0f));
/*
warn() << "Label widget size : " << getWidth() << " x " << getHeight() << std::endl;
warn() << "Label widget tsize: " << getWidthTotal() << " x " << getHeightTotal() << std::endl;
warn() << "Label XY coords : " << getX() << " x " << getY() << std::endl;
warn() << "Label BB in size : " << size.x() << " x " << size.y() << std::endl;
warn() << "Label xy position : " << x << " y " << y << std::endl;
warn() << "------------------------------------" << std::endl;
*/
const WindowManager* wm = _getWindowManager();
if(wm && wm->isUsingRenderBins()) {
_text->getOrCreateStateSet()->setRenderBinDetails(
static_cast<int>(z * OSGWIDGET_RENDERBIN_MOD),
"RenderBin"
);
z = 0.0f;
}
_text->setPosition(osg::Vec3(x, y, z));
}
void Label::setLabel(const std::string& label) {
_text->setText(label);
_calculateSize(getTextSize());
}
void Label::setLabel(const osgText::String& label)
{
_text->setText(label);
_calculateSize(getTextSize());
}
void Label::setFont(const std::string& font) {
_text->setFont(font);
_calculateSize(getTextSize());
}
void Label::setFontSize(unsigned int size) {
_text->setCharacterSize(size);
_text->setFontResolution(size, size);
_calculateSize(getTextSize());
}
void Label::setFontColor(const Color& c) {
_text->setColor(c);
}
void Label::setShadow(point_type offset) {
_text->setBackdropType(osgText::Text::DROP_SHADOW_BOTTOM_RIGHT);
_text->setBackdropImplementation(osgText::Text::NO_DEPTH_BUFFER);
_text->setBackdropOffset(offset);
_calculateSize(getTextSize());
}
XYCoord Label::getTextSize() const {
osg::BoundingBox bb = _text->getBound();
return XYCoord(
osg::round(bb.xMax() - bb.xMin()),
osg::round(bb.yMax() - bb.yMin())
);
}
}
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