Custom colorbar labeling centered on colors

Question

John Cruce 2024-5-18

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2120296-custom-colorbar-labeling-centered-on-colors

评论： Voss 2024-5-20

I have a figure for which I want to create custom colorbar labeling. Below is the sample code:

figure;
set(gca,'xtick',[],'xticklabel',[],'ytick',[],'yticklabel',[],'color','w');
set(gcf,'units','pixel','position',[70,70,600,600],'papersize',[600,600],'color','w');
ax=gca;
colormap(flipud(jet(11)));
caxis([0 11]);
hcb=colorbar('SouthOutside');
axPos = ax.Position;
colorbarpos=hcb.Position;
hcb.Ruler.TickLabelRotation=0;
set(hcb,'YTick',[0:1:11],'TickLength',colorbarpos(4)/colorbarpos(3));

This gives a standard southoutside, reverse jet colorbar like below:

Instead, I'd like to create custom labels centered on each color...something like below:

Any ideas on how or if this can be done?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Voss 2024-5-18

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2120296-custom-colorbar-labeling-centered-on-colors#answer_1459841

在 MATLAB Online 中打开

f = figure;

set(gca,'xtick',[],'xticklabel',[],'ytick',[],'yticklabel',[],'color','w');

set(f,'units','pixel','position',[70,70,600,600],'papersize',[600,600],'color','w');

colormap(flipud(jet(11)));

caxis([0 11]);

hcb=colorbar('SouthOutside','YTick',[]);

colorbarpos=hcb.Position;

ax = axes( ...

'Parent',f, ...

'Units','normalized', ...

'Position',[colorbarpos(1) 0 colorbarpos([3 2])], ...

'Visible','off', ...

'XLim',[0 1], ...

'YLim',[0 1.1]);

text( ...

'Parent',ax, ...

'Position',[0 1], ...

'String',{'Record','Warmest'}, ...

'HorizontalAlignment','left', ...

'VerticalAlignment','top')

text( ...

'Parent',ax, ...

'Position',[1 1], ...

'String',{'Record','Coldest'}, ...

'HorizontalAlignment','right', ...

'VerticalAlignment','top')

patch( ...

'Parent',ax, ...

'XData',[0.15 0.17 0.165 0.17 0.15 0.85 0.83 0.835 0.83 0.85], ...

'YData',[0.8 0.85 0.8 0.75 0.8 0.8 0.85 0.8 0.75 0.8], ...

'EdgeColor','k', ...

'FaceColor','k')

text( ...

'Parent',ax, ...

'Position',[0.2 0.8], ...

'String','Top 5 Warmest', ...

'HorizontalAlignment','left', ...

'VerticalAlignment','middle', ...

'BackgroundColor','w')

text( ...

'Parent',ax, ...

'Position',[0.8 0.8], ...

'String','Top 5 Coldest', ...

'HorizontalAlignment','right', ...

'VerticalAlignment','middle', ...

'BackgroundColor','w')

8 个评论
显示 6更早的评论隐藏 6更早的评论

John Cruce 2024-5-19

在 MATLAB Online 中打开

This is really good.

I'm attempting to bring this code into a projected map (geographic lat/long coordinate system), but I'm running into issues with the axes when I draw the latitude longitude grid.

Below is a sample using the m_map mapping package (https://www.eoas.ubc.ca/~rich/map.html). Everything works as anticipated before the final m_grid line...

f=figure;
set(gca,'xtick',[],'xticklabel',[],'ytick',[],'yticklabel',[],'color','w');
set(f,'units','pixel','position',[70,70,600,600],'papersize',[600,600],'color','w');
m_proj('Miller Cylindrical','lon',[-170 -100],'lat',[20 80]);
colormap(flipud(jet(11)));
caxis([0 11]);
hcb=colorbar('SouthOutside','YTick',[]);
colorbarpos=hcb.Position;
ax = axes( ...
    'Parent',f, ...
    'Units','normalized', ...
    'Position',[colorbarpos(1) 0 colorbarpos([3 2])], ...
    'Visible','off', ...
    'XLim',[0 1], ...
    'YLim',[0 1.1]);
text( ...
    'Parent',ax, ...
    'Position',[0 1], ...
    'String',{'Record','Warmest'}, ...
    'HorizontalAlignment','left', ...
    'VerticalAlignment','top')
text( ...
    'Parent',ax, ...
    'Position',[1 1], ...
    'String',{'Record','Coldest'}, ...
    'HorizontalAlignment','right', ...
    'VerticalAlignment','top')
patch( ...
    'Parent',ax, ...
    'XData',[0.15 0.17 0.165 0.17 0.15 0.85 0.83 0.835 0.83 0.85], ...
    'YData',[0.8 0.85 0.8 0.75 0.8 0.8 0.85 0.8 0.75 0.8], ...
    'EdgeColor','k', ...
    'FaceColor','k')
text( ...
    'Parent',ax, ...
    'Position',[0.2 0.8], ...
    'String','Top 5 Warmest', ...
    'HorizontalAlignment','left', ...
    'VerticalAlignment','middle', ...
    'BackgroundColor','w')
text( ...
    'Parent',ax, ...
    'Position',[0.8 0.8], ...
    'String','Top 5 Coldest', ...
    'HorizontalAlignment','right', ...
    'VerticalAlignment','middle', ...
    'BackgroundColor','w')
m_grid('fontsize',12,'xtick',[-180:20:180],'ytick',[-80:20:80],'linestyle',':','fontsize',10);

Any ideas on how to get this onto the projected grid?

Voss 2024-5-19

在 MATLAB Online 中打开

scf_fig.m

The problem is that m_grid uses the figure's CurrentAxes, which, at the point in the code you are calling m_grid, is the invisible axes that contains the arrows and texts. One solution is to call m_grid earlier, say, right after you call m_proj, so that the the first axes created is still the figure's CurrentAxes.

f=figure;
set(gca,'xtick',[],'xticklabel',[],'ytick',[],'yticklabel',[],'color','w');
set(f,'units','pixel','position',[70,70,600,600],'papersize',[600,600],'color','w');
m_proj('Miller Cylindrical','lon',[-170 -100],'lat',[20 80]);
m_grid('fontsize',12,'xtick',-180:20:180,'ytick',-80:20:80,'linestyle',':','fontsize',10);
colormap(flipud(jet(11)));
caxis([0 11]);
hcb=colorbar('SouthOutside','YTick',[]);
colorbarpos=hcb.Position;
ax = axes( ...
    'Parent',f, ...
    'Units','normalized', ...
    'Position',[colorbarpos(1) 0 colorbarpos([3 2])], ...
    'Visible','off', ...
    'XLim',[0 1], ...
    'YLim',[0 1.1]);
text( ...
    'Parent',ax, ...
    'Position',[0 1], ...
    'String',{'Record','Warmest'}, ...
    'HorizontalAlignment','left', ...
    'VerticalAlignment','top')
text( ...
    'Parent',ax, ...
    'Position',[1 1], ...
    'String',{'Record','Coldest'}, ...
    'HorizontalAlignment','right', ...
    'VerticalAlignment','top')
patch( ...
    'Parent',ax, ...
    'XData',[0.15 0.17 0.165 0.17 0.15 0.85 0.83 0.835 0.83 0.85], ...
    'YData',[0.8 0.85 0.8 0.75 0.8 0.8 0.85 0.8 0.75 0.8], ...
    'EdgeColor','k', ...
    'FaceColor','k')
text( ...
    'Parent',ax, ...
    'Position',[0.2 0.8], ...
    'String','Top 5 Warmest', ...
    'HorizontalAlignment','left', ...
    'VerticalAlignment','middle', ...
    'BackgroundColor','w')
text( ...
    'Parent',ax, ...
    'Position',[0.8 0.8], ...
    'String','Top 5 Coldest', ...
    'HorizontalAlignment','right', ...
    'VerticalAlignment','middle', ...
    'BackgroundColor','w')
f.SizeChangedFcn = {@scf_fig,hcb,ax};

Another solution would be to include the 'axes',ax_handle property/value pair in the call to m_grid, where ax_handle is the first axes created, i.e., the one you want m_grid to apply to.

f=figure;
ax_handle = gca();
set(ax_handle,'xtick',[],'xticklabel',[],'ytick',[],'yticklabel',[],'color','w');
set(f,'units','pixel','position',[70,70,600,600],'papersize',[600,600],'color','w');
m_proj('Miller Cylindrical','lon',[-170 -100],'lat',[20 80]);
colormap(flipud(jet(11)));
caxis([0 11]);
hcb=colorbar('SouthOutside','YTick',[]);
colorbarpos=hcb.Position;
ax = axes( ...
    'Parent',f, ...
    'Units','normalized', ...
    'Position',[colorbarpos(1) 0 colorbarpos([3 2])], ...
    'Visible','off', ...
    'XLim',[0 1], ...
    'YLim',[0 1.1]);
text( ...
    'Parent',ax, ...
    'Position',[0 1], ...
    'String',{'Record','Warmest'}, ...
    'HorizontalAlignment','left', ...
    'VerticalAlignment','top')
text( ...
    'Parent',ax, ...
    'Position',[1 1], ...
    'String',{'Record','Coldest'}, ...
    'HorizontalAlignment','right', ...
    'VerticalAlignment','top')
patch( ...
    'Parent',ax, ...
    'XData',[0.15 0.17 0.165 0.17 0.15 0.85 0.83 0.835 0.83 0.85], ...
    'YData',[0.8 0.85 0.8 0.75 0.8 0.8 0.85 0.8 0.75 0.8], ...
    'EdgeColor','k', ...
    'FaceColor','k')
text( ...
    'Parent',ax, ...
    'Position',[0.2 0.8], ...
    'String','Top 5 Warmest', ...
    'HorizontalAlignment','left', ...
    'VerticalAlignment','middle', ...
    'BackgroundColor','w')
text( ...
    'Parent',ax, ...
    'Position',[0.8 0.8], ...
    'String','Top 5 Coldest', ...
    'HorizontalAlignment','right', ...
    'VerticalAlignment','middle', ...
    'BackgroundColor','w')
m_grid('axes',ax_handle,'fontsize',12,'xtick',[-180:20:180],'ytick',[-80:20:80],'linestyle',':','fontsize',10);
f.SizeChangedFcn = {@scf_fig,hcb,ax};
scf_fig([],[],hcb,ax)

In both of those examples, I'm using the attached SizeChangedFcn for the figure, in order to position the invisible axes properly relative to the colorbar.

The problem I'm seeing now is that the colorbar overlaps the main axes xtick labels, so I guess the colorbar needs to be moved down slightly, which is the same problem (or the opposite problem, really) that you ran into before

https://www.mathworks.com/matlabcentral/answers/2094701-move-colorbar-closer-to-figure

which I'm not sure if you found an adequate solution for.

John Cruce 2024-5-20

This is extremely elegant and a tremendous help. Thank you!

Voss 2024-5-20

You're welcome!

请先登录，再进行评论。

Answer 2

Athanasios Paraskevopoulos 2024-5-18

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2120296-custom-colorbar-labeling-centered-on-colors#answer_1459831

编辑：Athanasios Paraskevopoulos 2024-5-18

在 MATLAB Online 中打开

I tried the folowing code! It is similar with your second graph, but I could replicate the arrows correct. You can edit the code and create the result yoy want

% Create a figure

figure;

% Set the axis properties

set(gca, 'xtick', [], 'xticklabel', [], 'ytick', [], 'yticklabel', [], 'color', 'w');

% Set the figure properties

set(gcf, 'units', 'pixel', 'position', [70, 70, 600, 600], 'papersize', [600, 600], 'color', 'w');

% Get the current axis handle

ax = gca;

% Set the colormap and color limits

colormap(flipud(jet(11)));

caxis([0 11]);

% Create a colorbar

hcb = colorbar('SouthOutside');

% Get axis and colorbar positions

axPos = ax.Position;

colorbarpos = hcb.Position;

% Set tick label rotation

hcb.Ruler.TickLabelRotation = 0;

% Define custom ticks and labels

customTicks = 0:1:11;

customLabels = {'', '', '', '', '', '', '', '', '', '', '', ''};

% Apply custom ticks and labels to the colorbar

set(hcb, 'Ticks', customTicks, 'TickLabels', customLabels, 'TickLength', colorbarpos(4) / colorbarpos(3));

% Add custom annotations

text('Units', 'normalized', 'Position', [0.05, -0.2], 'String', 'Record Warmest', 'FontSize', 10, 'HorizontalAlignment', 'center');

text('Units', 'normalized', 'Position', [0.30, -0.2], 'String', 'Top 5 Warmest', 'FontSize', 10, 'HorizontalAlignment', 'center');

text('Units', 'normalized', 'Position', [0.70, -0.2], 'String', 'Top 5 Coldest', 'FontSize', 10, 'HorizontalAlignment', 'center');

text('Units', 'normalized', 'Position', [0.95, -0.2], 'String', 'Record Coldest', 'FontSize', 10, 'HorizontalAlignment', 'center');

% Add arrows

annotation('textarrow', [0.05 0.00], [0.02 0.02], 'String', '');

annotation('textarrow', [0.35 0.30], [0.02 0.02], 'String', '');

annotation('textarrow', [0.65 0.70], [0.02 0.02], 'String', '');

annotation('textarrow', [0.95 1.00], [0.02 0.02], 'String', '');

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Custom colorbar labeling centered on colors

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

采纳的回答

8 个评论
显示 6更早的评论隐藏 6更早的评论

更多回答（1 个）

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

另请参阅

类别

标签

产品

版本

Community Treasure Hunt

Custom colorbar labeling centered on colors

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

采纳的回答

8 个评论 显示 6更早的评论隐藏 6更早的评论

更多回答（1 个）

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

另请参阅

类别

标签

产品

版本

Community Treasure Hunt

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

8 个评论
显示 6更早的评论隐藏 6更早的评论

0 个评论
显示 -2更早的评论隐藏 -2更早的评论