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mark_points_on_image.m
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function [point_values, axis_locations, point_locations] = mark_points_on_image(imagex, axis_values, axis_locations, point_locations);
stop_pick = 0;
if ~exist( 'point_locations' )
point_locations = [];
end
count=size( point_locations,2 );
[xsize,ysize,zsize]=size(imagex);
zoomedin = 0;
view_axes = [0 ysize 0 xsize ];
if ~exist( 'axis_locations' ) | isempty(axis_locations)
axis_locations = [];
plot_stuff( imagex, xsize, ysize, view_axes, axis_locations, point_locations );
axis_locations = select_axis_locations(xsize,ysize);
end
axis_locations = fix_order_axis_locations( axis_locations );
while (stop_pick<1)
plot_stuff( imagex, xsize, ysize, ...
view_axes,...
axis_locations, point_locations );
title( 'Pick a point');
[xpick,ypick,button] = ginput(1);
switch button
case 1
count = count+1;
point_locations(:,count) = [xpick;ypick];
case 2
if size( point_locations,2) > 0
dist2 = ( (xpick - point_locations(1,:)).^2 + ...
(ypick - point_locations(2,:)).^2 );
[dummy, closestpos] = min( dist2 );
point_locations = point_locations( :, [1:(closestpos-1) ...
(closestpos+1):end]);
count = count - 1;
end
case 3
if (zoomedin == 0)
view_axes = [xpick-ysize/5 xpick+ysize/5 ...
ypick - xsize/5 ypick+xsize/5];
zoomedin= 1;
else
view_axes = [0 ysize 0 xsize ];
zoomedin = 0;
end
end
switch char(button)
case {'q','Q','z','Z'}
stop_pick=1;
case {'x'} % reorder by x
[ dummy, sort_index ] = sort( point_locations(1,:) );
point_locations = point_locations( :, sort_index );
case {'r','R'}
% Refine axis.
axis_dists = [ abs(xpick - axis_locations(1)) ...
abs(xpick - axis_locations(2)) ...
abs(ypick - axis_locations(3)) ...
abs(ypick - axis_locations(4)) ];
[dummy,closest_axis] = min( axis_dists );
switch closest_axis
case {1,2}
hold on;
plot( axis_locations(closest_axis)*[1 1],[0 xsize],'m');
case {3,4}
hold on;
plot( [0 ysize],axis_locations(closest_axis)*[1 1],'m');
end
[xpick,ypick,button] = ginput(1);
switch closest_axis
case {1,2}
axis_locations(1) = xpick;
case {3,4}
axis_locations(4) = ypick;
end
end
end
point_values = [];
for k = 1:count
point_values(1,k) = (axis_values(2)-axis_values(1)) * ...
(point_locations(1,k) - axis_locations(1))/ ...
(axis_locations(2)-axis_locations(1)) + axis_values(1);
point_values(2,k) = (axis_values(4)-axis_values(3)) * ...
(point_locations(2,k) - axis_locations(4))/ ...
(axis_locations(3)-axis_locations(4)) + axis_values(3);
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function axis_locations = select_axis_locations(xsize, ysize);
hold on
title( 'Select *left* y axis' )
[xpick,ypick,button] = ginput(1);
axis_locations(1) = xpick;
plot( [xpick xpick], [0, xsize],'r');
title( 'Select *right* y axis' )
[xpick,ypick,button] = ginput(1);
axis_locations(2) = xpick;
plot( [xpick xpick], [0, xsize],'r');
title( 'Select *bottom* x axis' )
[xpick,ypick,button] = ginput(1);
axis_locations(3) = ypick;
plot( [0, ysize],[ypick ypick],'r');
title( 'Select *top* x axis' )
[xpick,ypick,button] = ginput(1);
axis_locations(4) = ypick;
plot( [0, ysize],[ypick ypick],'r');
hold off
function plot_axes( axis_locations, xsize, ysize );
hold on
plot( [axis_locations(1) axis_locations(1)], [0, xsize],'r');
plot( [axis_locations(2) axis_locations(2)], [0, xsize],'r');
plot( [0, ysize],[axis_locations(3) axis_locations(3)],'r');
plot( [0, ysize],[axis_locations(4) axis_locations(4)],'r');
hold off
function plot_stuff( imagex, xsize, ysize, ...
view_axes,...
axis_locations, point_locations );
clf;
figure(1); subplot(1,1,1);
image(imagex); hold on
axis([0 ysize 0 xsize]);
hold on
if length( axis_locations) == 4
plot_axes( axis_locations, xsize, ysize );
set(gca,'xtick',axis_locations([1 2]),'xticklabel',{'L','R'});
set(gca,'ytick',axis_locations([3 4]),'yticklabel',{'T','B'});
end
hold on
for k = 1:size( point_locations,2)
plot( point_locations(1,k), point_locations(2,k),'rx');
handle = text( point_locations(1,k), point_locations(2,k),...
num2str(k) );
set(handle, 'clipping','on');
end
hold off
axis(view_axes);
function axis_locations = fix_order_axis_locations( axis_locations );
if axis_locations(2) < axis_locations(1)
axis_locations([1 2]) = axis_locations([2 1]);
end
if axis_locations(4) < axis_locations(3)
axis_locations([3 4]) = axis_locations([4 3]);
end