1 | function datalabel(state,marker_color); |
---|
2 | %datalabel Interactive labeling of data points on a plot |
---|
3 | % datalabel with no arguments toggles the data tip state |
---|
4 | % datalabel ON turns data tips on for the current figure |
---|
5 | % datalabel OFF turns data tips off for the current figure |
---|
6 | % datalabel('ON',S), where S is a character string specifying |
---|
7 | % a marker and/or color will add the specified marker to |
---|
8 | % the data tip. Default is red circles: 'ro' |
---|
9 | % |
---|
10 | % Click on a line to label the nearest data point. |
---|
11 | % Click and drag on a data tip to move it. |
---|
12 | % Right-Click on a data tip to delete it. |
---|
13 | % |
---|
14 | % Example: |
---|
15 | % t = 0:pi/50:2.5*pi; |
---|
16 | % y = sin(t); |
---|
17 | % plot(t,y); %Try plot(y,t), too |
---|
18 | % datalabel on |
---|
19 | % %Click on lines to label values. |
---|
20 | % %Click and drag to move. |
---|
21 | % %Right click to delete. |
---|
22 | % datalabel off |
---|
23 | % %Existing data tips are locked in place; can't add more |
---|
24 | % datalabel('on','.b'); %Add blue dots with next data tips |
---|
25 | % |
---|
26 | % smh: 5/02: Click on text to re-position text relative to data point |
---|
27 | % Click on data point to move to a different value |
---|
28 | % |
---|
29 | % This function is provided as an example only. It has not been |
---|
30 | % tested, and therefore, it is not officially supported by The |
---|
31 | % MathWorks, Inc. |
---|
32 | |
---|
33 | % Written by Scott Hirsch |
---|
34 | % shirsch@mathworks.com |
---|
35 | % Most of this code comes from MOVTEXT, by John Galenski III |
---|
36 | % (Mistakes are mine, though!) |
---|
37 | % Copyright (c) by The MathWorks, Inc. 1985-2002 |
---|
38 | % |
---|
39 | |
---|
40 | |
---|
41 | if nargin == 0 | strcmp(state,'on') % Set the WindowButtonDownFcn |
---|
42 | if nargin <2 , |
---|
43 | marker='o'; %none |
---|
44 | color = 'r'; |
---|
45 | else |
---|
46 | %Parse marker string |
---|
47 | colors = 'bgrcmyk'; |
---|
48 | markers = '+o*.xsdv^><ph'; |
---|
49 | for ii=1:length(marker_color) |
---|
50 | col_ind = strfind(colors,marker_color(ii)); |
---|
51 | if ~isempty(col_ind) %It's a color |
---|
52 | color = marker_color(ii); |
---|
53 | else %Try a marker instead |
---|
54 | mark_ind = strfind(markers,marker_color(ii)); |
---|
55 | if ~isempty(mark_ind) |
---|
56 | marker = marker_color(ii); |
---|
57 | end; |
---|
58 | end; |
---|
59 | end; |
---|
60 | end; |
---|
61 | if ~exist('color','var'), color = 'r'; end; %set default |
---|
62 | if ~exist('marker','var'), marker = '.'; end; %set default |
---|
63 | %If the user specifies a color, but no marker, I use a dot. |
---|
64 | |
---|
65 | set(gcf,'WindowButtonDownFcn','datalabel down') |
---|
66 | setappdata(gcf,'Marker',marker); |
---|
67 | setappdata(gcf,'Color',color); |
---|
68 | set(gcf,'DoubleBuffer','on'); %eliminate flicker |
---|
69 | |
---|
70 | elseif strcmp(state,'down') % Execute the WindowButtonDownFcn |
---|
71 | htype = get(gco,'Type'); |
---|
72 | tag = get(gco,'Tag'); |
---|
73 | marker = getappdata(gcf,'Marker'); |
---|
74 | color = getappdata(gcf,'Color'); |
---|
75 | |
---|
76 | if strcmp(htype,'line') & ~strcmp(tag,'Dot') %Line - Add text object |
---|
77 | %This is sloppy, but it works. The marker is a line named 'Dot' |
---|
78 | |
---|
79 | %Look up nearest value on line. |
---|
80 | |
---|
81 | %User-selected point |
---|
82 | cp = get(gca,'CurrentPoint'); |
---|
83 | x = cp(1,1); %first xy values |
---|
84 | y = cp(1,2); %first xy values |
---|
85 | |
---|
86 | %Line data |
---|
87 | xl = get(gco,'XData'); |
---|
88 | yl = get(gco,'YData'); |
---|
89 | |
---|
90 | [xv,yv] = local_nearest(x,xl,y,yl); |
---|
91 | |
---|
92 | |
---|
93 | %For R13 or higher (MATLAB 6.5), use a background color on the text string |
---|
94 | th = text(xv,yv,[' (' num2str(xv) ',' num2str(yv) ')']); |
---|
95 | v=str2num(version('-release')); |
---|
96 | if v>=6.5 |
---|
97 | set(th,'BackgroundColor','y'); |
---|
98 | end; |
---|
99 | |
---|
100 | |
---|
101 | ph = line(xv,yv, ... |
---|
102 | 'Color',color, ... |
---|
103 | 'Marker',marker, ... |
---|
104 | 'Tag','Dot', ... |
---|
105 | 'UserData',[gco th], ... |
---|
106 | 'LineStyle','none'); |
---|
107 | |
---|
108 | mh = uicontextmenu('Tag','DeleteObject', ... |
---|
109 | 'Callback','ud = get(gco,''UserData'');delete([gco ud(2)]);'); |
---|
110 | |
---|
111 | set([th ph],'UIContextMenu',mh); |
---|
112 | |
---|
113 | set(th,'UserData',[gco ph]); %Store handle to line |
---|
114 | elseif strcmp(htype,'text') | strcmp(tag,'Dot') |
---|
115 | set(gco,'EraseMode','xor') |
---|
116 | set(gcf,'WindowButtonMotionFcn','datalabel move', ... |
---|
117 | 'WindowButtonUpFcn','datalabel up'); |
---|
118 | end |
---|
119 | |
---|
120 | elseif strcmp(state,'move') % Execute the WindowButtonMotionFcn |
---|
121 | htype = get(gco,'Type'); |
---|
122 | tag = get(gco,'Tag'); |
---|
123 | if ~isempty(gco) |
---|
124 | %Is this the dot or the text |
---|
125 | if strcmp(htype,'text') %The text |
---|
126 | th = gco; |
---|
127 | handles = get(gco,'UserData'); |
---|
128 | ph = handles(2); |
---|
129 | slide = 0; %Don't slide along line; just reposition text |
---|
130 | else %The marker |
---|
131 | ph = gco; |
---|
132 | handles = get(gco,'UserData'); |
---|
133 | th = handles(2); |
---|
134 | slide = 1; %Slide along line to next data point |
---|
135 | end; |
---|
136 | |
---|
137 | cp = get(gca,'CurrentPoint'); |
---|
138 | pt = cp(1,[1 2]); |
---|
139 | |
---|
140 | %Constrain to Line |
---|
141 | lh = handles(1); %Line |
---|
142 | |
---|
143 | x = cp(1,1); %first xy values |
---|
144 | y = cp(1,2); %first xy values |
---|
145 | |
---|
146 | if slide %Move to new data value |
---|
147 | xl = get(lh,'XData'); |
---|
148 | yl = get(lh,'YData'); |
---|
149 | |
---|
150 | ax = axis; |
---|
151 | |
---|
152 | %Get nearest value |
---|
153 | [xv,yv]=local_nearest(x,xl,y,yl); |
---|
154 | |
---|
155 | set(th,'Position', [xv yv 0],'String',[' (' num2str(xv) ',' num2str(yv) ')']) |
---|
156 | set(ph,'XData',xv,'YData',yv); |
---|
157 | else %Just move text around. |
---|
158 | set(th,'Position', [x y 0]) |
---|
159 | end; |
---|
160 | |
---|
161 | |
---|
162 | drawnow |
---|
163 | end; |
---|
164 | elseif strcmp(state,'up') % Execute the WindowButtonUpFcn |
---|
165 | htype = get(gco,'Type'); |
---|
166 | tag = get(gco,'Tag'); |
---|
167 | if strcmp(htype,'text') | strcmp(tag,'Dot') |
---|
168 | set(gco,'EraseMode','Normal') |
---|
169 | set(gcf,'WindowButtonMotionFcn','') |
---|
170 | end; |
---|
171 | elseif strcmp(state,'off') % Unset the WindowButton...Fcns |
---|
172 | set(gcf,'WindowButtonDownFcn','','WindowButtonUpFcn','') |
---|
173 | end |
---|
174 | |
---|
175 | |
---|
176 | function [xv,yv]=local_nearest(x,xl,y,yl) |
---|
177 | %Inputs: |
---|
178 | % x Selected x value |
---|
179 | % xl Line Data (x) |
---|
180 | % y Selected y value |
---|
181 | % yl Line Data (y) |
---|
182 | %Find nearest value of [xl,yl] to (x,y) |
---|
183 | %Special Case: Line has a single non-singleton value |
---|
184 | if sum(isfinite(xl))==1 |
---|
185 | fin = find(isfinite(xl)); |
---|
186 | xv = xl(fin); |
---|
187 | yv = yl(fin); |
---|
188 | else |
---|
189 | %Normalize axes |
---|
190 | xlmin = min(xl); |
---|
191 | xlmax = max(xl); |
---|
192 | ylmin = min(yl); |
---|
193 | ylmax = max(yl); |
---|
194 | |
---|
195 | % xln = xl; |
---|
196 | % xn = x; |
---|
197 | % |
---|
198 | % yln = yl; |
---|
199 | % yn = y; |
---|
200 | xln = (xl - xlmin)./(xlmax - xlmin); |
---|
201 | xn = (x - xlmin)./(xlmax - xlmin); |
---|
202 | |
---|
203 | yln = (yl - ylmin)./(ylmax - ylmin); |
---|
204 | yn = (y - ylmin)./(ylmax - ylmin); |
---|
205 | |
---|
206 | %Find nearest point using our friend Ptyhagoras |
---|
207 | a = xln - xn; %Distance between x and the line |
---|
208 | b = yln - yn; %Distance between y and the line |
---|
209 | c = (a.^2 + b.^2); %Distance between point and line |
---|
210 | %Don't need sqrt, since we get same answer anyway |
---|
211 | [junk,ind] = min(c); |
---|
212 | |
---|
213 | %Nearest value on the line |
---|
214 | xv = xl(ind); |
---|
215 | yv = yl(ind); |
---|
216 | end; |
---|