test_oppo2.m

% generate the full colormap
n_colors=256;
x=linspace(0,1,n_colors+1)';
x=x(1:end-1);
cmap=oppo2_of_x(x);

% show it
figure;
colormap(cmap);
colorbar;
colorbar_axes_h=findobj(gcf,'Tag','Colorbar');
colorbar_image_h=findobj(colorbar_axes_h,'Tag','TMW_COLORBAR');
set(colorbar_image_h,'YData',[-180 +180]);
set(colorbar_axes_h,'YLim',[-180 +180]);
set(colorbar_axes_h,'YTick',[-180 -90 0 +90 +180]);

% make a colormap with inter-color spacings equal
n_colors=256;
cmap=oppo2(n_colors);

% show the colormap
figure;
colormap(cmap);
colorbar;
colorbar_axes_h=findobj(gcf,'Tag','Colorbar');
colorbar_image_h=findobj(colorbar_axes_h,'Tag','TMW_COLORBAR');
set(colorbar_image_h,'YData',[-180 +180]);
set(colorbar_axes_h,'YLim',[-180 +180]);
set(colorbar_axes_h,'YTick',[-180 -90 0 +90 +180]);

% show the colormap a prettier way
theta=(-pi:pi/100:+pi)';
theta=repmat(theta,[1 2]);
r=repmat([0.8 1],[size(theta,1) 1]);
im_index=round(255*(((theta/pi)+1)/2))+1;
im_rgb=ind2rgb(im_index,cmap);
x=r.*cos(theta);
y=r.*sin(theta);
figure;
polar_grid_simple;
hold on;
surf(x,y,zeros(size(x)),...
     im_rgb,...
     'EdgeColor','none');
hold off;
text(0,0,'oppo2',...
     'interpreter','none',...
     'horizontalalignment','center',...
     'verticalalignment','middle');