Showing a colorbar with volshow
Adding a colorbar directly to the figure produced by volshow is not supported. Here's a workaround that can be summarized by these steps:
- The object produced by volshow can be parented to a viewer object which can be parented to a figure, panel, GridLayout, or a Tab object. This demo uses a uipanel.
- The uipanel is positioned with space on the right for a colorbar.
- An invisible axes is added to the chart which is required to host a colorbar. The axes' colormap and color limit (CLim) is set to the same colormap used in the object produced by volshow.
- A colorbar is added and positioned to the right, next to the uipanel.
- The figure and uipanel colors are set to the same color as the viewer to give the figure a unified appearance.
% Create a figure that hosts a viewer3d object in a uipanel, leaving room
% for a colorbar.
fig = uifigure();
uip = uipanel(fig,Units="normalized",Position=[0 0 .90 1],BorderType="none");
viewer = viewer3d(uip);
% Show volshow within the viewer3d
imcube = rand(30, 30, 100) .^(permute(linspace(0, 15, 100), [3, 1, 2]));
vol = volshow(imcube, Colormap=cool,RenderingStyle="Isosurface",Parent=viewer);
viewer.BackgroundColor = [0 0 0];
viewer.GradientColor = [0.2 0.2 0.2];
% Add an invisible axes so that a colorbar can be added and placed on the
% right
ax = axes(fig, Visible="off", HandleVisibility="off",HitTest="off",PickableParts="none");
ax.Toolbar.Visible = 'off';
% Assign desired colormap and create a colorbar\
ax.Colormap = vol.Colormap;
ax.CLim = [min(vol.Data,[],'all'),max(vol.Data,[],'all')];
cb = colorbar(ax,"Units","normalized","Color",[.8 .8 .8]);
cb.Position(1) = 0.90;
% Set figure and uipanel color to the same color as the viewer
fig.Color = viewer.BackgroundColor;
uip.BackgroundColor = viewer.BackgroundColor;
