void VectorRenderer::render(RenderContext * context)
{
assert(this->m_initial != 0);
assert(this->m_vector != 0);
math::const_VectorRef<2> initial(this->m_initial);
math::const_VectorRef<2> vector(this->m_vector);
glColor4v(m_color.ptr());
glBegin(GL_LINES);
glVertex2v(initial.ptr());
glVertex2v((vector + initial).ptr());
glEnd();
if (m_frontArrow && !vector.isZero()) {
math::Vector<2> versor = vector.versor();
versor.mul(INITIAL_ARROW_SIZE * context->currentView()->svHeightRatio());
glBegin(GL_TRIANGLES);
glVertex2v((vector + initial).ptr());
glVertex2v((vector + initial - versor.rotate(INITIAL_ARROW_ANGLE)).ptr());
glVertex2v((vector + initial - versor.rotate(-2.0 * INITIAL_ARROW_ANGLE)).ptr());
glEnd();
}
}
inline void glColor( const QVector4D & color ) { glColor4v( reinterpret_cast<const float*>(&color) ); }