void UtilGL::drawArrow(const Vector3 &a,const Vector3 &u,double radius,const string &s1,const string &s2,double arrowRatio) {
Vector3 to;
to.set(a+u*(1.0-arrowRatio));
glPushMatrix();
glPushMatrix();
glTranslatef(a.x(),a.y(),a.z());
if (!s1.empty()) {
draw(s1,Vector3(0,0,0));
}
glPopMatrix();
glPushMatrix();
Quaternion q;
q.set(Vector3(0,0,1),u);
double angle;Vector3 axe;
q.copyToAngleAxis(&angle,&axe);
glTranslatef(a.x(),a.y(),a.z());
glRotatef(angle,axe.x(),axe.y(),axe.z());
glScalef(radius,radius,(to-a).length());
drawCylinder();
glPopMatrix();
if (u.length()>0.0001) {
glPushMatrix();
glTranslatef((a+u).x(),(a+u).y(),(a+u).z());
glPushMatrix();
if (!s2.empty()) {
draw(s2,Vector3(0.2*arrowRatio*u.length(),0.03,0));
}
glPopMatrix();
glPopMatrix();
glPushMatrix();
glTranslatef(to.x(),to.y(),to.z());
Matrix4 m;
m.setRotation(Vector3(0,0,1),u);
glMultMatrixf(m.fv());
drawCone(radius*(2.0-arrowRatio),u.length()*arrowRatio);
glPopMatrix();
}
glPopMatrix();
}
void Shader::uniform(int loc,const Matrix4 &m) {
glUniformMatrix4fv(loc,1,GL_FALSE,m.fv());
}
void Shader::uniform(const string &nom,const Matrix4 &m) {
int loc=findLocation(nom);
glUniformMatrix4fv(loc,1,GL_FALSE,m.fv());
}