void Camera::dragMouse( int x, int y )
{
Vec3f mouseDelta = Vec3f(x,y,0.0f) - mLastMousePosition;
mLastMousePosition = Vec3f(x,y,0.0f);
switch(mCurrentMouseAction)
{
case kActionTranslate:
{
calculateViewingTransformParameters();
double xTrack = -mouseDelta[0] * kMouseTranslationXSensitivity;
double yTrack = mouseDelta[1] * kMouseTranslationYSensitivity;
Vec3f transXAxis = mUpVector ^ (mPosition - mLookAt);
transXAxis /= sqrt((transXAxis*transXAxis));
Vec3f transYAxis = (mPosition - mLookAt) ^ transXAxis;
transYAxis /= sqrt((transYAxis*transYAxis));
setLookAt(getLookAt() + transXAxis*xTrack + transYAxis*yTrack);
break;
}
case kActionRotate:
{
float dAzimuth = -mouseDelta[0] * kMouseRotationSensitivity;
float dElevation = mouseDelta[1] * kMouseRotationSensitivity;
setAzimuth(getAzimuth() + dAzimuth);
setElevation(getElevation() + dElevation);
if (getAzimuth() > M_PI)
mAzimuth -= 2.0*M_PI;
if (getElevation() > M_PI)
mElevation -= 2.0*M_PI;
fprintf(stderr, "az %f, elev %f\n", mAzimuth, mElevation);
break;
}
case kActionZoom:
{
float dDolly = -mouseDelta[1] * kMouseZoomSensitivity;
setDolly(getDolly() + dDolly);
break;
}
case kActionTwist:
// Not implemented
default:
break;
}
}
void Camera::dragMouse( int x, int y )
{
Vec3f mouseDelta = Vec3f(x,y,0.0f) - mLastMousePosition;
switch(mCurrentMouseAction)
{
case kActionTranslate:
{
// Determine mouse movement
double xTrack = -mouseDelta[0] * kMouseTranslationXSensitivity;
double yTrack = mouseDelta[1] * kMouseTranslationYSensitivity;
// Recalculate stuff if needed
if (m_bDirtyTransform)
{
updateTransform();
}
// Determine directions of motion in scene space
Vec3f direction = m_vPosition - m_vLookAt;
Vec3f transXAxis = m_vUpVector ^ direction;
transXAxis /= sqrt((transXAxis*transXAxis));
Vec3f transYAxis = direction ^ transXAxis;
transYAxis /= sqrt((transYAxis*transYAxis));
// Move the camera's look-at point
setLookAt(getLookAt() + transXAxis*xTrack + transYAxis*yTrack);
break;
}
case kActionRotate:
{
// Store the rotation in this quarternion
float quat[4];
// Get the mouse coordinates in a range between -1.0 and 1.0
float viewHalfWidth = (m_iViewportWidth / 2.f), viewHalfHeight = (m_iViewportHeight / 2.f);
float oldX = mLastMousePosition[0] * 2.f / (m_iViewportWidth - 1) - 1.f,
oldY = mLastMousePosition[1] * 2.f / (m_iViewportHeight - 1) - 1.f,
newX = x * 2.f / (m_iViewportWidth - 1) - 1.f,
newY = y * 2.f / (m_iViewportHeight - 1) - 1.f;
// Get the quaternion to rotate around, from the trackball code.
trackball( quat, oldX, -oldY, newX, -newY );
// Add the new quaternion to the current one.
float oldQuat[4];
memcpy(oldQuat, m_fQuat, sizeof(float) * 4);
//add_quats(oldQuat, quat, m_fQuat);
add_quats(quat, oldQuat, m_fQuat);
// Update the transform parameters.
updateTransform();
break;
}
case kActionZoom:
{
// Determine dolly movement.
float fDollyDelta = -mouseDelta[1] * kMouseZoomSensitivity;
// Add to dolly
setDolly(getDolly() + fDollyDelta);
updateTransform();
break;
}
case kActionTwist:
{
break;
}
default:
break;
}
mLastMousePosition = Vec3f(x,y,0.0f);
}
