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matplotlib箭头颜色未按预期工作

matplotlib python

lucky1928 · 技术社区 · 3 年前

如何更改下面演示代码中的箭头颜色?

import matplotlib.pyplot as plt

def save_fig(fig,pngname):
    fig.savefig(pngname, dpi=fig.dpi, bbox_inches="tight")
    print("[[%s]]"%pngname)    
    return

def add_arrow(fig,ax,lw,lc):
    xmin,xmax = ax.get_xlim()
    ax.arrow(xmin,0,xmax-xmin+.2,0,#fc='k', ec='k',
         lw = lw,head_width=.1,head_length=0.4, overhang = 0, 
         length_includes_head=False, clip_on = False,edgecolor='k',facecolor=lc) 
    return

def main():
    x = [
    #"FLAGS",
    "INTENDED_VSYNC",
    "VSYNC",
    "OLDEST_INPUT_EVENT",
    "HANDLE_INPUT_START",
    "ANIMATION_START",
    "PERFORM_TRAVERSALS_START",
    "DRAW_START",
    "SYNC_QUEUED",
    "SYNC_START",
    "ISSUE_DRAW_COMMANDS_START",
    "SWAP_BUFFERS",
    "FRAME_COMPLETED",
   ]

    lw = 2
    lc = "grey"
    fig, ax = plt.subplots(1, figsize=(8,.2))
    y = [0]*len(x)
    ax.plot(x,y,color=lc)

    ax.set_ylim([0,0.1])
    plt.xticks(rotation=45,ha='right')
    ax.tick_params(direction = 'inout',color=lc)
    ax.tick_params('both', length=20, width=lw, which='major')
    ax.tick_params('both', length=10, width=lw, which='minor')
    plt.yticks([], [])
    for direction in ["left", "right", "bottom", "top"]:     
        ax.spines[direction].set_visible(False)
    add_arrow(fig,ax,lw,lc)
    #save_fig(fig,sdir + "/vsync.png")
    plt.show()
    return
sdir = "/home/tester"
main()

输出:

0 回复 | 直到 3 年前

fabianegli 3 年前

颜色在中定义 ax.arrow() 通过 color , edgecolor 和 facecolor 。

边缘色 设置箭头边缘的颜色。
面部颜色 设置箭头体中的颜色。
颜色 设置两者的颜色, 边缘色 和 面部颜色 。

如果你想要一个统一颜色的箭头,你可以设置 颜色 或者可替换地将两者都设置, 边缘色 和 面部颜色 到相同的值。在这种情况下,这意味着删除 边缘色 和 面部颜色 并添加 color=lc 或者替换 edgecolor='k' 具有 edgecolor=lc 。

import matplotlib.pyplot as plt

def save_fig(fig,pngname):
    fig.savefig(pngname, dpi=fig.dpi, bbox_inches="tight")
    print("[[%s]]"%pngname)    
    return

def add_arrow(fig,ax,lw,lc):
    xmin,xmax = ax.get_xlim()
    ax.arrow(xmin,0,xmax-xmin+.2,0,#fc='k', ec='k',
         lw = lw,head_width=.1,head_length=0.4, overhang = 0, 
         length_includes_head=False, clip_on = False,color=lc) 
    return

def plot():
    x = [
    #"FLAGS",
    "INTENDED_VSYNC",
    "VSYNC",
    "OLDEST_INPUT_EVENT",
    "HANDLE_INPUT_START",
    "ANIMATION_START",
    "PERFORM_TRAVERSALS_START",
    "DRAW_START",
    "SYNC_QUEUED",
    "SYNC_START",
    "ISSUE_DRAW_COMMANDS_START",
    "SWAP_BUFFERS",
    "FRAME_COMPLETED",
   ]

    lw = 2
    lc = "grey"
    fig, ax = plt.subplots(1, figsize=(8,.2))
    y = [0]*len(x)
    ax.plot(x,y,color=lc)

    ax.set_ylim([0,0.1])
    plt.xticks(rotation=45,ha='right')
    ax.tick_params(direction = 'inout',color=lc)
    ax.tick_params('both', length=20, width=lw, which='major')
    ax.tick_params('both', length=10, width=lw, which='minor')
    plt.yticks([], [])
    for direction in ["left", "right", "bottom", "top"]:     
        ax.spines[direction].set_visible(False)
    add_arrow(fig,ax,lw,lc)
    #save_fig(fig,sdir + "/vsync.png")
    plt.show()
    return

plot()