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src/Viewer/sview.cxx: in Step views, scale panning by fov/window_size, to allow fine control even at high zoom.

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This means that the image on screen moves by the same distance as the mouse
(for small movements), regardless of window size or zoom level. Current mouse
drag handling in extra view windows is poor though - mouse is constrained by
screen size.

Would be good to do this for standard views as well, but the code in view.cxx
is more complex so haven't been able to figure out how.
This commit is contained in:
Julian Smith 2021-01-27 23:21:41 +00:00
parent ffbf37d198
commit c59d9e039d
1 changed files with 38 additions and 13 deletions

51
src/Viewer/sview.cxx
View file

@ -193,7 +193,8 @@ struct SviewStep
/* Updates <posdir>. */
virtual void evaluate(SviewPosDir& posdir, double dt=0) = 0;
virtual void mouse_drag(double delta_x, double delta_y)
/* Modify view angle. */
virtual void mouse_drag(double delta_x_deg, double delta_y_deg)
{
}
@ -391,14 +392,16 @@ struct SviewStepRotate : SviewStep
posdir.roll = m_damping_roll.update(dt, posdir.roll + m_roll);
}
void mouse_drag(double delta_x, double delta_y) override
void mouse_drag(double delta_x_deg, double delta_y_deg) override
{
if (m_fixed) {
return;
}
m_heading += delta_x;
m_pitch += delta_y;
SG_LOG(SG_VIEW, SG_DEBUG, " delta_x=" << delta_x << " delta_y=" << delta_y
m_heading += delta_x_deg;
m_pitch += delta_y_deg;
SG_LOG(SG_VIEW, SG_DEBUG,
" delta_x_deg=" << delta_x_deg
<< " delta_y_deg=" << delta_y_deg
<< ":"
<< " m_heading=" << m_heading
<< " m_pitch=" << m_pitch
@ -626,11 +629,11 @@ struct SviewStepFinal : SviewStep
posdir.direction2 = ec2body * rotation * q;
}
void mouse_drag(double delta_x, double delta_y) override
void mouse_drag(double delta_x_deg, double delta_y_deg) override
{
if (m_orientation) {
m_heading += delta_x;
m_pitch += delta_y;
m_heading += delta_x_deg;
m_pitch += delta_y_deg;
}
}
@ -1029,7 +1032,7 @@ struct SviewView
/* Returns false if window has been closed. */
virtual bool update(double dt) = 0;
virtual void mouse_drag(double delta_x, double delta_y) = 0;
virtual void mouse_drag(double delta_x_deg, double delta_y_deg) = 0;
/* Sets this view's camera position/orientation from <posdir>. */
void posdir_to_view(SviewPosDir posdir)
@ -1480,10 +1483,10 @@ struct SviewViewEyeTarget : SviewView
return true;
}
void mouse_drag(double delta_x, double delta_y) override
void mouse_drag(double delta_x_deg, double delta_y_deg) override
{
for (auto step: m_steps.m_steps) {
step->mouse_drag(delta_x, delta_y);
step->mouse_drag(delta_x_deg, delta_y_deg);
}
}
@ -1894,8 +1897,30 @@ bool SviewMouseMotion(int x, int y, const osgGA::GUIEventAdapter& ea)
bool button2 = globals->get_props()->getBoolValue("/devices/status/mice/mouse/button[2]");
if (button2 && sview_view->m_mouse_button2) {
/* Button2 drag. */
SG_LOG(SG_GENERAL, SG_DEBUG, "button2:" << " xx=" << xx << " yy=" << yy);
sview_view->mouse_drag(xx - sview_view->m_mouse_x, yy - sview_view->m_mouse_y);
double delta_x = xx - sview_view->m_mouse_x;
double delta_y = yy - sview_view->m_mouse_y;
if (delta_x || delta_y) {
/* Convert delta (which is mouse movement in pixels) to a change
in viewing angle in degrees. We do this using the fov and window
size so that the result is the image moving as though it was being
panned by the mouse movement. So angle changes are smaller for
high zoom values or small windows, making high zoom views easy to
control. */
osg::Camera* camera = sview_view->m_osg_view->getCamera();
double fov_y;
double aspect_ratio;
double z_near;
double z_far;
camera->getProjectionMatrixAsPerspective(fov_y, aspect_ratio, z_near, z_far);
double fov_x = fov_y * aspect_ratio;
simgear::compositor::Compositor* compositor = sview_view->m_compositor;
osg::Viewport* viewport = compositor->getViewport();
double delta_x_deg = delta_x / viewport->width() * fov_x;
double delta_y_deg = delta_y / viewport->height() * fov_y;
sview_view->mouse_drag(delta_x_deg, delta_y_deg);
}
}
sview_view->m_mouse_button2 = button2;
sview_view->m_mouse_x = xx;