MATLAB设置两行xticklabels以及colorbar宽度

Forest

GNSS、空间物理

最近画的一幅图的X轴是时间，需要标注月份、日期和时分，显然每个xticklabel太长了，于是想要分两行标注，第一行标注时分，第二行标注月日。搜了一圈发现MATLAB并没有实现这个功能的函数，于是只能使用text行数进行实现。实现过程主要是先调整gca的宽度，然后上移为两行text腾出空间。然后设置gca本身的xticklabels为空。根据xticks的位置和y轴的范围设置两行text的范围，最后下移xlabel的范围。

画完之后又发现colorbar太宽了，看起来不美观。结果调整colorbar position之后，gca竟然自动调整了宽度，导致gca和colorbar重叠了，于是又设置了一遍gca的position。下面是示例代码，总体顺序是

(1)画图

(2)画colorbar

(3)调整gca position

(4)标注两行text

(5)调整xlabel的position

(6)调整colorbar的position

(7)重置gca position

clc;clear;
figure;
pcolor(0:10,1:20,rand(20,11));shading interp;
c=colorbar;colormap(cool);
%plot colorbar first and get gca position
ax=gca;
xticks(0:2:10);
xlim([0 10]);
%% add two lines of xitck labels
xticklabels('');
% narrow gca and move up to make space for two lines of xitck labels
ax.Position=[ax.Position(1),ax.Position(2)+ax.Position(4)*0.3,ax.Position(3),ax.Position(4)*0.7];
xTicks = get(gca, 'xtick');
XtickLabelStrs{1}={' 00:00';' 12:00';' 00:00';' 12:00';' 00:00';' 12:00'};
XtickLabelStrs{2}={'Jan 24';'Jan 24';'Jan 25';'Jan 25';'Jan 26';'Jan 26'};
xl=xlim; minX=xl(1);maxX=xl(2);
yl=ylim; minY=yl(1);maxY=yl(2);
% You will have to adjust the offset based on the size of figure
VerticalOffset = (maxY-minY)*0.2;
for xx = 1:length(xTicks)
% Create a text box at every Tick label position
text(xTicks(xx), minY-VerticalOffset, ...
    [XtickLabelStrs{1}(xx);XtickLabelStrs{2}(xx)],...
    'fontsize',9,...
    'HorizontalAlignment','center');
% 'HorizontalAlignment','center' specifies that the elements of the different lines 
% will be center aligned
xlabel('Time [UT]','position',[(minX+maxX)/2,minY-VerticalOffset*2]);
ylabel('Frequency [mHz]');