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Other small improvement to the trackball for the ortographic case

This commit is contained in:
Paolo Cignoni 2014-11-05 11:02:51 +00:00
parent 1ff3a301ec
commit c84d999b4b
1 changed files with 43 additions and 9 deletions
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52
wrap/gui/trackutils.h
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@ -132,10 +132,10 @@ y = --- * (r^2 /2.0)
@param hit the projection of hitplane on the rotational hyperboloid relative to the manipulator.
@return true if and only if hit is valid.
*/
bool HitHyper (Point3f center, float radius, Point3f viewpoint, Plane3f vp,
Point3f hitplane, Point3f & hit)
bool HitHyper (Point3f center, float radius, Point3f viewpoint, Plane3f viewplane,
Point3f hitOnViewplane, Point3f & hit)
{
float hitplaney = Distance (center, hitplane);
float hitplaney = Distance (center, hitOnViewplane);
float viewpointx = Distance (center, viewpoint);
float a = hitplaney / viewpointx;
@ -155,13 +155,43 @@ bool HitHyper (Point3f center, float radius, Point3f viewpoint, Plane3f vp,
return false;
}
// Computing the result in 3d space;
Point3f dirRadial = hitplane - center;
Point3f dirRadial = hitOnViewplane - center;
dirRadial.Normalize ();
Point3f dirView = vp.Direction ();
Point3f dirView = viewplane.Direction ();
dirView.Normalize ();
hit = center + dirRadial * yval + dirView * xval;
return true;
}
/**
* @brief HitHyperOrtho
* @param center
* @param radius
* @param viewpoint
* @param viewplane
* @param hitOnViewplane
* @param hit
* @return true if the hit is valid
*
* Specialized version of the HitHyper();
* in the simple ortho case, the hit point is just the value of
* y = 1/x * (r^2 /2 ) on the hitOnViewPlane
*/
bool HitHyperOrtho(Point3f center, float radius, Point3f viewpoint, Plane3f viewplane,
Point3f hitOnViewplane, Point3f & hit)
{
float xval = Distance (center, hitOnViewplane);
float yval = (1.0 / xval ) * radius * radius / 2.0f;
// Computing the result in 3d space;
Point3f dirRadial = hitOnViewplane - center;
dirRadial.Normalize ();
Point3f dirView = viewplane.Direction ();
dirView.Normalize ();
hit = center + dirRadial * xval + dirView * yval;
return true;
}
// nota: non ho scritto io questa funzione,
// quindi la documentazione doxy potrebbe non essere accurata al 100%.
@ -198,8 +228,7 @@ Point3f HitSphere (Trackball * tb, const Point3f & p)
hitSphere1(0,0,0),
hitSphere2(0,0,0),
hitHyper(0,0,0);
IntersectionPlaneLine < float >(vp, ln, hitPlane);
Sphere3f sphere (center, tb->radius);//trackball sphere
bool resSp = IntersectionLineSphere < float >(sphere, ln, hitSphere1, hitSphere2);
@ -212,7 +241,12 @@ Point3f HitSphere (Trackball * tb, const Point3f & p)
}
/*float dl= */ Distance (ln, center);
bool resHp = HitHyper (center, tb->radius, viewpoint, vp, hitPlane, hitHyper);
bool resHp;
IntersectionPlaneLine < float >(vp, ln, hitPlane);
if(tb->camera.isOrtho)
resHp= HitHyperOrtho (center, tb->radius, viewpoint, vp, hitPlane, hitHyper);
else
resHp= HitHyper (center, tb->radius, viewpoint, vp, hitPlane, hitHyper);
// four cases
@ -230,7 +264,7 @@ Point3f HitSphere (Trackball * tb, const Point3f & p)
// 4) line cross both sphere and hyperboloid: choose according angle.
float angleDeg = math::ToDeg (Angle ((viewpoint - center), (hitSphere - center)));
//printf("Angle %f (%5.2f %5.2f %5.2f) (%5.2f %5.2f %5.2f)\n",angleDeg,hitSphere[0],hitSphere[1],hitSphere[2],hitHyper[0],hitHyper[1],hitHyper[2]);
// qDebug("Angle %f (%5.2f %5.2f %5.2f) (%5.2f %5.2f %5.2f)",angleDeg,hitSphere[0],hitSphere[1],hitSphere[2],hitHyper[0],hitHyper[1],hitHyper[2]);
if (angleDeg < 45)
return hitSphere;
else