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Python Matplotlib.colors.to_rgb()用法及代碼示例


Matplotlib是Python中令人驚歎的可視化庫,用於二維陣列圖。 Matplotlib是一個基於NumPy數組構建的multi-platform數據可視化庫,旨在與更廣泛的SciPy堆棧配合使用。

matplotlib.colors.to_rgb()

matplotlib.colors.to_rgb()函數用於將c(即顏色)轉換為RGB顏色。它將顏色名稱轉換為RGB編碼顏色的數組。它從0-1返回三個浮點數的RGB元組。

用法: matplotlib.colors.to_rgb(c)


參數:

  • c:這接受一個代表顏色名稱的字符串。它可以是RGB或RGBA序列或多種形式的字符串:
    1. 十六進製顏色字符串,例如“#000FFF”
    2. 標準名稱,例如“綠色”
    3. 組合“ rgbcmykw”中的一封信
    4. 浮點數的字符串表示形式,例如“ 0.4”,表示0-1比例為灰色

範例1:

import matplotlib.pyplot as plt 
import matplotlib.colors as mcolors 
  
  
# helper function to plot a color table 
def colortable(colors, title, colors_sort = True, emptycols = 0):
   
    # cell dimensions 
    width = 212
    height = 22
    swatch_width = 48
    margin = 12
    topmargin = 40
   
    # Sorting colors bbased on hue, saturation, 
    # value and name. 
    if colors_sort is True:
        to_hsv = sorted((tuple(mcolors.rgb_to_hsv(mcolors.to_rgb(color))), 
                         name) 
                        for name, color in colors.items()) 
          
        names = [name for hsv, name in to_hsv] 
          
    else:
        names = list(colors) 
   
    length_of_names = len(names) 
    length_cols = 4 - emptycols 
    length_rows = length_of_names // length_cols + int(length_of_names % length_cols > 0) 
   
    width2 = width * 4 + 2 * margin 
    height2 = height * length_rows + margin + topmargin 
    dpi = 72
   
    figure, axes = plt.subplots(figsize =(width2 / dpi, height2 / dpi), dpi = dpi) 
    figure.subplots_adjust(margin / width2, margin / height2, 
                        (width2-margin)/width2, (height2-topmargin)/height2) 
      
    axes.set_xlim(0, width * 4) 
    axes.set_ylim(height * (length_rows-0.5), -height / 2.) 
    axes.yaxis.set_visible(False) 
    axes.xaxis.set_visible(False) 
    axes.set_axis_off() 
    axes.set_title(title, fontsize = 24, loc ="left", pad = 10) 
   
    for i, name in enumerate(names):
          
        rows = i % length_rows 
        cols = i // length_rows 
        y = rows * height 
   
        swatch_start_x = width * cols 
        swatch_end_x = width * cols + swatch_width 
        text_pos_x = width * cols + swatch_width + 7
   
        axes.text(text_pos_x, y, name, fontsize = 14, 
                horizontalalignment ='left', 
                verticalalignment ='center') 
   
        axes.hlines(y, swatch_start_x, swatch_end_x, 
                  color = colors[name], linewidth = 18) 
   
    return figure 
   
colortable(mcolors.BASE_COLORS, "Base Colors", 
                colors_sort = False, emptycols = 1) 
colortable(mcolors.TABLEAU_COLORS, "Tableau Palette", 
                colors_sort = False, emptycols = 2) 
colortable(mcolors.CSS4_COLORS, "CSS Colors") 
   
plt.show()

輸出:


範例2:

from matplotlib import colors 
import matplotlib.pyplot as plt 
  
  
alpha = 0.5
  
kwargs = dict(edgecolors ='none', s = 3900, marker ='s') 
  
for i, color in enumerate(['pink', 'brown', 'green']):
  
    rgb = colors.to_rgb(color) 
    plt.scatter([i], [0], color = color, **kwargs) 
    plt.scatter([i], [1], color = color,  
                alpha = alpha, **kwargs) 
    plt.scatter([i], [2], color = rgb, **kwargs)

輸出:





注:本文由純淨天空篩選整理自RajuKumar19大神的英文原創作品 Matplotlib.colors.to_rgb() in Python。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。