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function camdolly(ax, dx, dy, dz, targetmode, coordsys)
%CAMDOLLY Dolly camera.
% CAMDOLLY(DX, DY, DZ) Moves the camera position and camera target
% of the current axes by the amounts specified in DX, DY, and DZ.
%
% CAMDOLLY(DX, DY, DZ, targetmode) determines if the camera target
% is moved. If targetmode is 'movetarget' (the default), both the
% camera position and the camera target are moved. If targetmode is
% 'fixtarget', only the camera position is moved.
%
% CAMDOLLY(DX, DY, DZ, targetmode, coordsys) determines the meaning
% of DX, DY, and DZ. If coordsys is 'camera' (the default), DX and
% DY move the camera up, down, right, and left in the camera's
% coordinate system; DZ moves the camera along the line which passes
% through the camera position and camera target. The units are
% normalized to the scene being viewed. For example, if DX is 1 the
% camera is moved to the right, which pushes the scene to the left
% edge of the box formed by the axes position. If DZ is .5, the
% camera is moved to a position half way in between the camera
% position and the camera target. If coordsys is 'pixels', DX and
% DY are interpreted as a pixel offset and DZ is ignored. If
% coordsys is 'data', DX, DY, and DZ are in data space (not the
% camera's coordinate system).
%
% CAMDOLLY(AX, ...) uses axes AX instead of the current axes.
%
% See also CAMORBIT, CAMPAN, CAMZOOM, CAMROLL.
% Copyright 1984-2005 The MathWorks, Inc.
% $Revision: 1.8.4.2 $ $Date: 2005/11/27 22:39:56 $
if nargin>6 || nargin<3
error('MATLAB:camdolly:IncorrectNumberArguments', 'Wrong number of arguments')
elseif nargin<6
if any(ishandle(ax)) && strcmp(get(ax, 'type'), 'axes')
if nargin<4
error('MATLAB:camdolly:InvalidNumberArguments', 'Wrong number of arguments')
else
coordsys = 'camera';
if nargin==4
targetmode = 'movetarget';
end
end
else
if nargin==5
coordsys = targetmode;
targetmode = dz;
elseif nargin==4
coordsys = 'camera';
targetmode = dz;
else %nargin==3
coordsys = 'camera';
targetmode = 'movetarget';
end
dz = dy;
dy = dx;
dx = ax;
ax = gca;
end
end
darSave = get(ax, 'dataaspectratio');
cpSave = get(ax, 'cameraposition' );
ctSave = get(ax, 'cameratarget' );
upSave = get(ax, 'cameraupvector' );
cvaSave = get(ax, 'cameraviewangle');
v = (ctSave-cpSave)./darSave;
dis = norm(v);
r = crossSimple(v, upSave./darSave);
u = crossSimple(r, v);
r = r/norm(r);
u = u/norm(u);
v = v/dis;
% delta = dx/darSave(1) * r + dy/darSave(2) * u + dz /darSave(3) * v;
% delta = delta .* darSave;
if coordsys(1)=='d' %data
delta = [dx dy dz];
else
if ~righthanded(ax), dx = -dx; end
fov = 2*dis*tan(cvaSave/2*pi/180);
if coordsys(1)=='p' %pixels
units = get(ax, 'units');
set(ax, 'units', 'pix')
pos = get(ax, 'pos');
set(ax, 'units', units)
pix = min(pos(3), pos(4));
delta = fov/pix .* darSave .* ((dx * r) + (dy * u));
else %camera
delta = darSave .* (fov/2 .* ((dx * r) + (dy * u)) + (dz * v * dis));
end
end
set(ax,'CameraUpVectorMode','manual');
newcp = cpSave+delta;
set(ax, 'cameraposition', newcp);
if targetmode(1)=='m'
newct = ctSave+delta;
set(ax, 'cameratarget', newct);
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function c=crossSimple(a,b)
c(1) = b(3)*a(2) - b(2)*a(3);
c(2) = b(1)*a(3) - b(3)*a(1);
c(3) = b(2)*a(1) - b(1)*a(2);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function val=righthanded(ax)
dirs=get(ax, {'xdir' 'ydir' 'zdir'});
num=length(find(lower(cat(2,dirs{:}))=='n'));
val = mod(num,2); |
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