本文整理汇总了C++中osg::Vec2::normalize方法的典型用法代码示例。如果您正苦于以下问题：C++ Vec2::normalize方法的具体用法？C++ Vec2::normalize怎么用？C++ Vec2::normalize使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类osg::Vec2的用法示例。
在下文中一共展示了Vec2::normalize方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: acos
double MultitouchPlugin::angleBetween2DVectors(osg::Vec2 v1, osg::Vec2 v2)
{
// http://codered.sat.qc.ca/redmine/projects/spinframework/repository/revisions/b6245189c19a7c6ba4fdb126940321c41c44e228/raw/src/spin/osgUtil.cpp
// normalize vectors (note: this must be done alone, not within any vector arithmetic. why?!)
v1.normalize();
v2.normalize();
// Get the dot product of the vectors
double dotProduct = v1 * v2;
// for acos, the value has to be between -1.0 and 1.0, but due to numerical imprecisions it sometimes comes outside this range
if (dotProduct > 1.0)
dotProduct = 1.0;
if (dotProduct < -1.0)
dotProduct = -1.0;
// Get the angle in radians between the 2 vectors (should this be -acos ? ie, negative?)
double angle = acos(dotProduct);
// Here we make sure that the angle is not a -1.#IND0000000 number, which means indefinite
if (isnan(angle)) //__isnand(x)
return 0;
// Return the angle in radians
return (angle);
}