Matlab转Python 画图pcolormesh的使用及一些注意事项-Toy模板网

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今天想把matlab一段画图代码转为python，使用到了colormap，尝试了一下午，将结果以及一些注意事项记录下来，算作学习笔记了。

先上matlab原代码

a = 0.13; b = 0.12; 
c = 0.7; d = 0.8;

figure( 'Position', [200 50 1100 900], 'InvertHardcopy', 'off', 'Color', 'w' ); 
colormap( jet(512) );
han = axes( 'Units', 'normalized', 'Position', [a b c d],...
            'Xlim', [timee(1), timee(timedim)],... 
            'YLim', [-30, 20], 'Ydir', 'reverse',...
            'FontName', 'Times', 'FontSize', 24, 'FontWeight', 'bold', 'Layer', 'top','LineWidth',1.5);


hold on;
xlabel( 'Time (ps)', 'FontName', 'Times', 'FontWeight', 'bold', 'FontSize', 32);
ylabel( 'Position (nm)', 'FontName', 'Times', 'FontWeight', 'bold', 'FontSize', 32); 
text( 0.10, 0.90, sprintf( '%5.0f ps', 10), 'Units', 'normalized','HorizontalAlignment', 'center', 'FontName', 'Times', 'FontSize', 50, 'FontWeight', 'bold', 'Color', 'r' );

set(colorbar, 'Position', [0.89 0.12 0.02 0.78], 'FontName', 'Times',...
  'FontSize', 24, 'FontWeight', 'bold' );
caxis([300 9500])   
% 'Dirction', 'reverse'
hold on;

pcolor(timee, pos, Data');
shading interp;
hold on;  

text( 1.04, 0.5, 'Temperature (K)', 'Units', 'normalized', 'Rotation', 90, 'HorizontalAlignment', 'center', ...
    'FontName', 'Times', 'FontSize', 32, 'FontWeight', 'bold', 'Color', 'k' );

结果如下：


fig, ax = plt.subplots(figsize=(15, 10))
c = ax.pcolormesh(timee, pos, Data.T, cmap='jet', vmin=1000, vmax=9000, shading='gouraud')
ax.set_xlim(timee[0], timee[timedim-1])
ax.set_ylim(-30, 20)

c_ = fig.colorbar(c, ax=ax)
c_.ax.tick_params(labelsize=32)  # 设置colorbar的标签字体及其大小
ax.set_xticklabels(ax.get_xticks(), size=30)
ax.set_yticklabels(ax.get_yticks(), size=30)

ax.set_xlabel('Time (ps)', family='Times', weight='bold', fontsize=32)
ax.set_ylabel('Position (nm)', family='Times', weight='bold', fontsize=32)

ax.invert_yaxis()

ax.text(51.5, 4.5, 'Temperature (K)', rotation=90, horizontalalignment='center',
        family='Times', fontsize=25, weight='bold', color='k')
ax.text(7, -25, '10 ps', horizontalalignment='center',
        family='Times', fontsize=50, weight='bold', color='r')

plt.show()

注意：

在pcolormesh函数使用过后，就必须要设置xlim或者ylim，然后再使用colorbar的函数，否则设置ylim会导致语句无效，不会报错但是改不了。想让图像更平滑一些，就加这个参数shading='gouraud'

可以参考下面的网站，熟悉axes的用法。

axes相关属性设置

pcolormesh的参数

Parameters:

Parameters:	C : array_like A scalar 2-D array. The values will be color-mapped. X, Y : array_like, optional cmap : str or Colormap, optional A Colormap instance or registered colormap name. The colormap maps the C values to colors. Defaults to `rcParams["image.cmap"]`. norm : Normalize, optional The Normalize instance scales the data values to the canonical colormap range [0, 1] for mapping to colors. By default, the data range is mapped to the colorbar range using linear scaling. Normalize实例将数据值缩放到用于映射到颜色的规范化colormap范围[0,1]。默认情况下，使用线性缩放将数据范围映射到colorbar范围。 vmin, vmax : scalar, optional, default: None The colorbar range. If None, suitable min/max values are automatically chosen by the Normalizeinstance (defaults to the respective min/max values of C in case of the default linear scaling). edgecolors : {'none', None, 'face', color, color sequence}, optional 　　边缘颜色，默认None: 'none' or '': No edge. non: `rcParams["patch.edgecolor"]` will be used. Note that currently`rcParams["patch.force_edgecolor"]` has to be True for this to work. 'face': Use the adjacent face color. An mpl color or sequence of colors will set the edge color. The singular form edgecolor works as an alias. alpha : scalar, optional, default: None 　　透明度 shading : {'flat', 'gouraud'}, optional The fill style, Possible values: 　　填充式样 'flat': A solid color is used for each quad. The color of the quad (i, j), (i+1, j), (i, j+1), (i+1, j+1) is given by `C[i,j]`. 'gouraud': Each quad will be Gouraud shaded: The color of the corners (i', j') are given by `C[i',j']`. The color values of the area in between is interpolated from the corner values. When Gouraud shading is used, edgecolors is ignored. snap : bool, optional, default: False Whether to snap the mesh to pixel boundaries文章来源地址https://www.toymoban.com/news/detail-456005.html

C : array_like

A scalar 2-D array. The values will be color-mapped.

X, Y : array_like, optional

cmap : str or Colormap, optional

A Colormap instance or registered colormap name. The colormap maps the C values to colors. Defaults to rcParams["image.cmap"].

norm : Normalize, optional

The Normalize instance scales the data values to the canonical colormap range [0, 1] for mapping to colors. By default, the data range is mapped to the colorbar range using linear scaling.

Normalize实例将数据值缩放到用于映射到颜色的规范化colormap范围[0,1]。默认情况下，使用线性缩放将数据范围映射到colorbar范围。

vmin, vmax : scalar, optional, default: None

The colorbar range. If None, suitable min/max values are automatically chosen by the Normalizeinstance (defaults to the respective min/max values of C in case of the default linear scaling).

edgecolors : {'none', None, 'face', color, color sequence}, optional

　　边缘颜色，默认None:

'none' or '': No edge.
non: rcParams["patch.edgecolor"] will be used. Note that currentlyrcParams["patch.force_edgecolor"] has to be True for this to work.
'face': Use the adjacent face color.
An mpl color or sequence of colors will set the edge color.

The singular form edgecolor works as an alias.

alpha : scalar, optional, default: None

　　透明度

shading : {'flat', 'gouraud'}, optional

The fill style, Possible values:

　　填充式样

'flat': A solid color is used for each quad. The color of the quad (i, j), (i+1, j), (i, j+1), (i+1, j+1) is given by C[i,j].
'gouraud': Each quad will be Gouraud shaded: The color of the corners (i', j') are given by C[i',j']. The color values of the area in between is interpolated from the corner values. When Gouraud shading is used, edgecolors is ignored.

snap : bool, optional, default: False

Whether to snap the mesh to pixel boundaries文章来源地址https://www.toymoban.com/news/detail-456005.html

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