MATLAB Answers

0

contourf with fixed colormap

Asked by gugum gumbira on 3 May 2016
Latest activity Answered by Mike Garrity
on 3 May 2016
Dear all,
I have cell data contain wave high penetration for illustration purpose, I plan to create a GIF file.
It seem working well in simulate the wave penetration but the colour always changing every loop.
How to make the colormap unchanged every loop ? ?
Here I send the script that I use
V = 60:60:2340;
C = cell(size(V));
for k = 1:numel(V)
filename = sprintf('ZA00%04d.TXT', V(k));
C{k} = load(filename,'AAAA');
end
figure(1)
filename = 'testnew51.gif';
C = cell2mat(C);
iwant1 = (1:708:27612) ;
iwant2 = (708:708:27612) ;
r = zeros(256, 1);
g = zeros(256, 1);
b = zeros(256, 1);
Z1=min(C(:));
Z2=max(C(:));
index999 = round((-9.9900 - Z1)/(Z2 - Z1) * 256)
r(1:index999) = linspace(0, 1, index999);
g(1:index999) = linspace(0, 1, index999);
b(1:index999) = 1;
r(index999:end) = 1;
255-index999
g(index999:end) = linspace(1, 0, 257-index999);
b(index999:end) = linspace(1, 0, 257-index999);
cmap = [r,g,b]; % jet(256);
colormap(cmap);
colorbar;
caxis([Z1, Z2]);
% [r c] = find(C==-9.9900);
%indices = find(C==-9.9900);
%C(indices)=0;
%Zlimit=[Z1 Z2];
%demcmap(Zlimit)
% colormapeditor
%[cmap]=buildcmap('bwr');
%colormap(cmap) % set colormap disini
%caxis ([-10 10])
for n = 1:length(iwant1) % looping sepanjang kolom1
contourf(flipud(flipud(flipud(C(:,iwant1(n):iwant2(n)))))) ; % Plot contour sesuai kolom
drawnow % update gambar per frame
frame = getframe(1); % mendapatkan gambar setiap frame
%F = getframe(gcf);
%image(F.cdata)
im = frame2im(frame); % convert frame ke image
[imind,cm] = rgb2ind(im,256); % convert RGB image ke indexceed image
if n == 1;
imwrite(imind,cm,filename,'gif', 'Loopcount',inf); % image ke file grafik
else
imwrite(imind,cm,filename,'gif','WriteMode','append');
end
end

  0 Comments

Sign in to comment.

Tags

1 Answer

Answer by Mike Garrity
on 3 May 2016

Try uncommenting the call to caxis and moving it after the call to contourf. It needs to be after the call to contourf because that (like most plotting functions) resets the CLim of the axes.

  0 Comments

Sign in to comment.