void ON_GL( ON_Viewport& viewport,
int port_left, int port_right,
int port_bottom, int port_top
)
{
// Sets viewport's port to port_* values and adjusts frustum
// so it's aspect matches the port's.
ON_Xform projectionMatrix; // camera to clip transformation
const int port_width = abs(port_right - port_left);
const int port_height = abs(port_top - port_bottom);
if ( port_width == 0 || port_height == 0 )
return;
const double port_aspect = ((double)port_width)/((double)port_height);
viewport.SetFrustumAspect( port_aspect );
viewport.SetScreenPort( port_left, port_right, port_bottom, port_top,
0, 0xff );
ON_BOOL32 bHaveCameraToClip = viewport.GetXform(
ON::camera_cs,
ON::clip_cs,
projectionMatrix
);
if ( bHaveCameraToClip ) {
projectionMatrix.Transpose();
glMatrixMode(GL_PROJECTION);
glLoadMatrixd( &projectionMatrix.m_xform[0][0] );
}
}
void CRhGLShaderProgram::SetupViewport(const ON_Viewport& vp)
{
ON_Xform mv;
bool bHaveModeView = false;
if ( m_Uniforms.rglModelViewProjectionMatrix >= 0 )
{
float ModelViewProjection[16];
ON_Xform mvp;
vp.GetXform( ON::world_cs, ON::clip_cs, mvp );
mvp.Transpose();
Mat4Dto4F( &mvp.m_xform[0][0], ModelViewProjection );
glUniformMatrix4fv( m_Uniforms.rglModelViewProjectionMatrix, 1, GL_FALSE, ModelViewProjection );
}
if ( m_Uniforms.rglModelViewMatrix >= 0 )
{
float ModelView[16];
vp.GetXform( ON::world_cs, ON::camera_cs, mv );
mv.Transpose();
bHaveModeView = true;
Mat4Dto4F( &mv.m_xform[0][0], ModelView );
glUniformMatrix4fv( m_Uniforms.rglModelViewMatrix, 1, GL_FALSE, ModelView );
}
if ( m_Uniforms.rglProjectionMatrix >= 0 )
{
float Projection[16];
ON_Xform pr;
vp.GetXform( ON::camera_cs, ON::clip_cs, pr );
pr.Transpose();
Mat4Dto4F( &pr.m_xform[0][0], Projection );
glUniformMatrix4fv( m_Uniforms.rglProjectionMatrix, 1, GL_FALSE, Projection );
}
if ( m_Uniforms.rglNormalMatrix >= 0 )
{
float NormalMatrix[9];
if ( !bHaveModeView )
{
vp.GetXform( ON::world_cs, ON::camera_cs, mv );
mv.Transpose();
bHaveModeView = true;
}
Mat4Dto3F( &mv.m_xform[0][0], NormalMatrix );
glUniformMatrix3fv( m_Uniforms.rglNormalMatrix, 1, GL_FALSE, NormalMatrix );
}
}
static void myRotateUpDown( ON_Viewport& viewport, double angle )
{
// rotates camera around the screen x axis
ON_3dVector camX;
ON_3dPoint center;
if ( glb_model )
center = glb_model->m_view.m_target;
else
viewport.GetFrustumCenter( center );
viewport.GetCameraFrame( NULL, camX, NULL, NULL );
myRotateView( viewport, camX, center, angle );
}
ON_BOOL32 ON_Light::GetLightXform(
const ON_Viewport& vp,
ON::coordinate_system dest_cs,
ON_Xform& xform
) const
{
ON::coordinate_system src_cs = CoordinateSystem();
return vp.GetXform( src_cs, dest_cs, xform );
}
static void myRotateLeftRight( ON_Viewport& viewport, double angle )
{
// ON_3dVector axis = ON_zaxis; // rotate camera about world z axis (z up feel)
ON_3dVector axis = ON_zaxis; // rotate camera about world y axis (u up feel)
ON_3dPoint center;
if ( glb_model )
center = glb_model->m_view.m_target;
else
viewport.GetFrustumCenter( center );
myRotateView( viewport, axis, center, angle );
}
void ON_GL( const ON_Viewport& viewport )
{
// sets model view matrix (world to camera transformation)
ON_Xform modelviewMatrix; // world to camera transformation
ON_BOOL32 bHaveWorldToCamera = viewport.GetXform(
ON::world_cs,
ON::camera_cs,
modelviewMatrix
);
if ( bHaveWorldToCamera ) {
modelviewMatrix.Transpose();
glMatrixMode(GL_MODELVIEW);
glLoadMatrixd( &modelviewMatrix.m_xform[0][0] );
}
}
static void myRotateView( ON_Viewport& viewport,
const ON_3dVector& axis,
const ON_3dPoint& center,
double angle )
{
ON_Xform rot;
ON_3dPoint camLoc;
ON_3dVector camY, camZ;
rot.Rotation( angle, axis, center );
if ( !viewport.GetCameraFrame( camLoc, NULL, camY, camZ ) )
return;
camLoc = rot*camLoc;
camY = rot*camY;
camZ = -(rot*camZ);
viewport.SetCameraLocation( camLoc );
viewport.SetCameraDirection( camZ );
viewport.SetCameraUp( camY );
ON_GL( viewport ); // update model view
}
static void myDrawAxesSprite( const ON_Viewport& viewport, HDC hdc )
{
// Use simple Windows calls to draw world axes sprite in lower left corner.
// Note that Windows has screen (0,0) in the upper left corner; i.e,
// screen "y" increases downwards.
if ( !hdc )
return;
const int axes_size = 30;
int port_left, port_right, port_top, port_bottom;
if ( !viewport.GetScreenPort( &port_left, &port_right, &port_bottom, &port_top, NULL, NULL ) )
return;
const int scr_width = port_right - port_left; // no "+1" here
const int scr_height = port_bottom - port_top; // no "+1" here
if (4*axes_size >= scr_width )
return;
if (4*axes_size >= scr_height )
return;
int x0 = 3*axes_size/2;
int y0 = port_bottom - 3*axes_size/2;
int indx[3] = {0,1,2};
double scr_coord[3][2];
viewport.GetCoordinateSprite( axes_size, x0, y0, indx, scr_coord );
#define LXSIZE 3
#define LYSIZE 3
#define LOFF 3
// draw 3 axes from back to front
HPEN axis_pen[3];
axis_pen[0] = CreatePen( PS_SOLID, 2, RGB(255,0,0) );
axis_pen[1] = CreatePen( PS_SOLID, 2, RGB(0,255,0) );
axis_pen[2] = CreatePen( PS_SOLID, 2, RGB(0,0,255) );
HGDIOBJ saved_pen = SelectObject( hdc, axis_pen[0] );
int i, k, x, y, lx, ly;
for (i=0;i<3;i++) {
k = indx[i];
x = (int)scr_coord[k][0];
y = (int)scr_coord[k][1];
// use direction of screen vector to determine letter placement
lx = x-x0; ly = y-y0;
if (abs(lx) > abs(ly)) {
// center letter to right/left of axis end
lx = (x >= x0) ? x + LXSIZE+LOFF : x - LXSIZE-LOFF;
ly = y;
}
else if (abs(ly) > abs(lx)) {
// center letter above/below axis end
lx = x;
ly = (y >= y0) ? y + LYSIZE+LOFF : y - LYSIZE-LOFF;
}
else if (lx) {
// diagonal axis - center letter on axis
lx = (x >= x0) ? x + LXSIZE+LOFF : x - LXSIZE-LOFF;
ly = (y >= y0) ? y + LYSIZE+LOFF : y - LYSIZE-LOFF;
}
else {
// axis is perp to screen - center letter at axis end
lx = x;
ly = y;
}
SelectObject( hdc, axis_pen[k] );
// draw axis
MoveToEx( hdc, x0, y0, NULL );
LineTo( hdc, x, y );
// draw axis label
switch (k) {
case 0: // X
MoveToEx( hdc, lx-LXSIZE, ly-LYSIZE, NULL );
LineTo( hdc, lx+LXSIZE, ly+LYSIZE );
MoveToEx( hdc, lx-LXSIZE, ly+LYSIZE, NULL );
LineTo( hdc, lx+LXSIZE, ly-LYSIZE );
break;
case 1: // Y
MoveToEx( hdc, lx-LXSIZE, ly-LYSIZE, NULL );
LineTo( hdc, lx, ly );
LineTo( hdc, lx+LXSIZE, ly-LYSIZE );
MoveToEx( hdc, lx, ly, NULL );
LineTo( hdc, lx, ly+LYSIZE );
break;
case 2: // Z
MoveToEx( hdc, lx-LXSIZE, ly-LYSIZE, NULL );
LineTo( hdc, lx+LXSIZE, ly-LYSIZE );
LineTo( hdc, lx-LXSIZE, ly+LYSIZE );
LineTo( hdc, lx+LXSIZE, ly+LYSIZE );
break;
}
}
SelectObject( hdc, saved_pen );
DeleteObject( axis_pen[0] );
DeleteObject( axis_pen[1] );
DeleteObject( axis_pen[2] );
#undef LXSIZE
#undef LYSIZE
#undef LOFF
}
void SetGLProjectionMatrix( ON_Viewport& viewport )
{
int pl, pr, pb, pt;
viewport.GetScreenPort( &pl, &pr, &pb, &pt, NULL, NULL );
ON_GL( viewport, pl, pr, pb, pt ); // updates GL projection matrix
}
bool CCommandSampleZoomRotateWindow::DollyWindow( const CRhinoViewport& vport, CRect pick_rect, ON_3dPoint& target_point, ON_Viewport& vp_out )
{
const ON_Viewport& vp_in = vport.VP();
vp_out = vp_in;
// screen port values
int sleft, sright, stop, sbottom;
if( !vp_in.GetScreenPort(&sleft, &sright, &sbottom, &stop) )
return false;
// frustum values
double fleft, fright, ftop, fbottom, fnear, ffar;
if( !vp_in.GetFrustum(&fleft, &fright, &fbottom, &ftop, &fnear, &ffar) )
return false;
// camera coordinate system
ON_3dPoint cam_loc = vp_in.CameraLocation();
ON_3dVector cam_z = vp_in.CameraZ();
// capture Depth Buffer
CRect screen_rect( sleft, stop, sright, sbottom );
// user-specified rectangle
CRect zoom_rect;
zoom_rect.IntersectRect( &pick_rect, screen_rect );
CRhinoZBuffer zbuffer( vport );
zbuffer.ShowIsocurves( true );
zbuffer.ShowMeshWires( true );
zbuffer.ShowCurves( true );
zbuffer.ShowPoints( true );
zbuffer.ShowText( true );
zbuffer.ShowAnnotations( false );
bool bSeeThrough = ( vport.XrayShade() || vport.GhostedShade() );
if( bSeeThrough )
zbuffer.EnableShading( false );
bool rc = zbuffer.Capture( zoom_rect );
if( rc && bSeeThrough && 0 == zbuffer.HitCount() )
{
zbuffer.EnableShading( true );
zbuffer.ShowIsocurves( false );
zbuffer.ShowMeshWires( false );
zbuffer.ShowCurves( false );
zbuffer.ShowPoints( false );
zbuffer.ShowText( false );
rc = zbuffer.Capture( zoom_rect );
}
ON_Xform s2c;
if( rc )
rc = zbuffer.VP().GetXform( ON::screen_cs, ON::camera_cs, s2c );
if( rc )
{
// dolly sideways so zoom rectangle is centered
ON_3dPoint near_rect[4];
vp_in.GetNearRect( near_rect[0], near_rect[1], near_rect[2], near_rect[3] );
double port_dx = fabs( double(sright - sleft) );
double port_dy = fabs( double(stop - sbottom) );
ON_Interval lr( sleft, sright);
double nx = lr.NormalizedParameterAt( 0.5 * (pick_rect.left + pick_rect.right) );
ON_Interval bt( sbottom, stop);
double ny = bt.NormalizedParameterAt( 0.5 * (pick_rect.bottom + pick_rect.top) );
ON_3dPoint zoom_center = (1-nx) * (1-ny) * near_rect[0] +
nx * (1-ny) * near_rect[1] +
(1-nx) * ny * near_rect[2] +
nx *ny * near_rect[3];
ON_3dVector dolly_vec = zoom_center - cam_loc;
// dolly perpendicular to cam_z
dolly_vec -= dolly_vec * cam_z * cam_z;
vp_out.DollyCamera( dolly_vec );
double pick_rect_dx = fabs(double (pick_rect.right - pick_rect.left));
double pick_rect_dy = fabs(double(pick_rect.top - pick_rect.bottom));
// expand pick_rect to have the aspect ratio of the viewport
double d = 1.0;
if( pick_rect_dx/port_dx < pick_rect_dy/port_dy)
d = pick_rect_dy / port_dy;
else
d = pick_rect_dx / port_dx ;
fleft *= d;
fright *= d;
fbottom *= d;
ftop *=d ;
vp_out.SetFrustum( fleft, fright, fbottom, ftop, fnear, ffar );
// target point on plane perpendicular to cam_z
cam_loc = vp_out.CameraLocation();
target_point = cam_loc + (target_point - cam_loc) *cam_z * cam_z;
}
return rc;
}