SourceForge has been redesigned. Learn more.
Close

[fc6c4c]: / inst / geom2d / clipPoints.m  Maximize  Restore  History

Download this file

94 lines (80 with data), 3.3 kB

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
## Copyright (C) 2004-2011 David Legland <david.legland@grignon.inra.fr>
## Copyright (C) 2004-2011 INRA - CEPIA Nantes - MIAJ (Jouy-en-Josas)
## Copyright (C) 2012 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
## All rights reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are met:
##
## 1 Redistributions of source code must retain the above copyright notice,
## this list of conditions and the following disclaimer.
## 2 Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in the
## documentation and/or other materials provided with the distribution.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ''AS IS''
## AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
## IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
## ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
## ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
## DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
## SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
## CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
## OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{points2} =} clipPoints (@var{points}, @var{box})
## Clip a set of points by a box.
##
## Returns the set @var{points2} which are located inside of the box @var{box}.
##
## @seealso{points2d, boxes2d, clipLine, drawPoint}
## @end deftypefn
function points = clipPoints(points, bb)
# get bounding box limits
xmin = bb(1);
xmax = bb(2);
ymin = bb(3);
ymax = bb(4);
# compute indices of points inside visible area
xOk = points(:,1)>=xmin & points(:,1)<=xmax;
yOk = points(:,2)>=ymin & points(:,2)<=ymax;
# keep only points inside box
points = points(xOk & yOk, :);
endfunction
%!demo
%! points = 2*rand(100,2)-1;
%! bb = [-0.5 0.5 -0.25 0.25];
%! cpo = clipPoints (points, bb);
%!
%! plot(points(:,1),points(:,2),'xr')
%! hold on
%! drawBox(bb,'color','k')
%! plot(cpo(:,1),cpo(:,2),'*g')
%! hold off
%!shared bb
%! bb = [0 10 0 20];
%!test
%! corners = [0 0;10 0;0 20;10 20];
%! cornersClipped = clipPoints(corners, bb);
%! assert (4, size(cornersClipped, 1));
%! assert (corners, cornersClipped, 1e-6);
%!test
%! borders = [0 5;10 5;5 0;5 20];
%! bordersClipped = clipPoints(borders, bb);
%! assert (4, size(bordersClipped, 1));
%! assert (borders, bordersClipped, 1e-6);
%!test
%! inside = [5 5;5 10;5 15];
%! insideClipped = clipPoints(inside, bb);
%! assert (size(inside, 1), size(insideClipped, 1));
%! assert (inside, insideClipped);
%!test
%! points = [-1 0;11 0;-1 20;11 20;0 -1;0 21;10 -1;10 21];
%! pointsClipped = clipPoints(points, bb);
%! assert (0, size(pointsClipped, 1));
%!test
%! points = [-5 10;0 10;5 10;10 10; 15 10];
%! pointsClipped = clipPoints(points, bb);
%! assert (3, size(pointsClipped, 1));
%! assert (points(2:4,:), pointsClipped, 1e-6);