C++ (Cpp) Vec2::Value Examples

Example #1

File: tapCamera.cpp Project: 7heaven/Flakor

//----------------------------------------------------------
//Pinch controll
//----------------------------------------------------------
void TapCamera::BeginPinch( const Vec2& v1, const Vec2& v2 )
{
    if( dragging_ )
        EndDrag();

    if( pinching_ )
        EndPinch();

    BeginDrag( Vec2() );

    vec_pinch_start_center_ = (v1 + v2) / 2.f;

    Vec2 vec = v1 - v2;
    float x_diff;
    float y_diff;
    vec.Value( x_diff, y_diff );

    pinch_start_distance_SQ_ = x_diff * x_diff + y_diff * y_diff;
    camera_rotation_start_ = atan2f( y_diff, x_diff );
    camera_rotation_now_ = 0;

    pinching_ = true;
    momentum_ = false;

    //Init momentum factors
    vec_offset_delta_ = Vec3();
}

Example #2

File: tapCamera.cpp Project: 7heaven/Flakor

void TapCamera::Pinch( const Vec2& v1, const Vec2& v2 )
{
    if( !pinching_ )
        return;

    //Update momentum factor
    vec_offset_last_ = vec_offset_now_;

    float x_diff, y_diff;
    Vec2 vec = v1 - v2;
    vec.Value( x_diff, y_diff );

    float fDistanceSQ = x_diff * x_diff + y_diff * y_diff;

    float f = pinch_start_distance_SQ_ / fDistanceSQ;
    if( f < 1.f )
        f = -1.f / f + 1.0f;
    else
        f = f - 1.f;
    if( isnan( f ) )
        f = 0.f;

    vec = (v1 + v2) / 2.f - vec_pinch_start_center_;
    vec_offset_now_ = Vec3( vec, flip_z_ * f );

    //Update momentum factor
    vec_offset_delta_ = vec_offset_delta_ * MOMENTUM_FACTOR
            + (vec_offset_now_ - vec_offset_last_);

    //
    //Update ration quaternion
    float fRotation = atan2f( y_diff, x_diff );
    camera_rotation_now_ = fRotation - camera_rotation_start_;

    //Trackball rotation
    quat_ball_rot_ = Quaternion( 0.f, 0.f, sinf( -camera_rotation_now_ * 0.5f ),
            cosf( -camera_rotation_now_ * 0.5f ) );
}