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function plot_beams_and_faces_figure(border_limits, img, faces, fig_handle)
%% plot faces and beams images
% border_limits has coordinates of left bottom and right top coners
xlb=border_limits(1);
ylb=border_limits(2);
xrt=border_limits(3);
yrt=border_limits(4);
[Ny,Nx]=size(img);
xc=linspace(xlb,xrt, Nx);
yc=linspace(ylb,yrt, Ny);
figure(fig_handle);
%% dummy plot just to put axis in the proper directions
plot(xlb,ylb,'.', xrt,yrt, '.');
hold on;
%% color map as gradient of particular color
Ncolors=64; % number of colors
% starting values
hsv_s=rgb2hsv([1,0,0]);
hue_f = hsv_s(1);
sat_f = hsv_s(2);
val_f = hsv_s(3);
% stop values
hue_s = hue_f;
sat_s = 0;
val_s = 1;
hue=linspace(hue_s,hue_f, Ncolors);
sat=linspace(sat_s,sat_f, Ncolors);
val=linspace(val_s,val_f, Ncolors);
cmap = hsv2rgb([hue', sat', val']);
colormap( cmap );
%% plot ray images
imagesc(xc,yc, img); colorbar;
hold on;
%% plot all faces
Nf=size(faces)(2); % number of faces
for i=1:Nf
hold on;
t=linspace(0,1,100);
xf=faces{i}.vertex1(1) + (faces{i}.vertex2(1)-faces{i}.vertex1(1))*t;
yf=faces{i}.vertex1(2) + (faces{i}.vertex2(2)-faces{i}.vertex1(2))*t;
plot(xf,yf, 'k-');
end
axis('equal');
hold off;
end
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