Matlab绘制彩色渐变色柱状图

转自：http://blog.sina.com.cn/s/blog_5fe5061101013lhq.html

 

 

% 彩色柱状图
%% 用到的数据
n = 13;
Z = rand (n, 1 );
%% 默认图片
bar (Z );
%% 简单的作图
% 这个图根据数据列中值的大小着色。每列中的
% 值越大，颜色越突出
figure
h= bar (Z );
colormap ( summer (n ) );
ch = get (h, 'Children' );
fvd = get (ch, 'Faces' );
fvcd = get (ch, 'FaceVertexCData' );
[~, izs ] = sortrows (Z, 1 );
for i = 1:n
row = izs ( i );
fvcd (fvd (row,: ) ) = i;
end
set (ch, 'FaceVertexCData',fvcd )
%% 更加漂亮的图片
% 图片会以渐变的方式着色，效果非常不错
figure
h= bar (Z );
ch = get (h, 'Children' );
fvd = get (ch, 'Faces' );
fvcd = get (ch, 'FaceVertexCData' );
[zs, izs ] = sortrows (Z, 1 );
k = 128; % 准备生成128 *3 行的colormap
colormap ( summer (k ) ); % 这样会产生一个128 * 3的矩阵，分别代表[R G B]的值
% 检视数据
whos ch fvd fvcd zs izs
%
%   Name       Size            Bytes  Class     Attributes
%
%   ch         1x1                 8  double
%   fvcd      66x1               528  double
%   fvd       13x4               416  double
%   izs       13x1               104  double
%   zs        13x1               104  double
%
shading interp % Needed to graduate colors
for i = 1:n
color = floor (k* i/n ); % 这里用取整函数获得color在colormap中行
row = izs ( i ); % Look up actual row # in data
fvcd (fvd (row, 1 ) ) = 1; % Color base vertices 1st index
fvcd (fvd (row, 4 ) ) = 1;
fvcd (fvd (row, 2 ) ) = color; % Assign top vertices color
fvcd (fvd (row, 3 ) ) = color;
end
set (ch, 'FaceVertexCData', fvcd ); % Apply the vertex coloring
set (ch, 'EdgeColor', 'k' )