帮我修改这段代码，使得箭头为空心的：img_dir = "/Users/wengjingjin/Desktop/annotation/org" img_files = sorted(os.listdir(img_dir)) # 创建新的空白图像 img1 = Image.open(os.path.join(img_dir, img_files[0])) img2 = Image.open(os.path.join(img_dir, img_files[1])) img3 = Image.open(os.path.join(img_dir, img_files[2])) img4 = Image.open(os.path.join(img_dir, img_files[3])) merge_img = Image.new('RGB', (img1.width + img2.width + 300, img2.height + img3.height + 300), (255, 255, 255)) # 将四幅图像粘贴到新图像上 merge_img.paste(img1, (0, 0)) merge_img.paste(img2, (img1.width + 300, 0)) merge_img.paste(img3, (img1.width + 300, img2.height + 300)) merge_img.paste(img4, (0, img1.height + 300)) # 添加数字标注 draw = ImageDraw.Draw(merge_img) draw.text((10, 10), "1", font=font, fill=(255, 255, 255)) draw.text((img1.width + 310, 10), "2", font=font, fill=(255, 255, 255)) draw.text((img1.width + 310, img2.height + 310), "3", font=font, fill=(255, 255, 255)) draw.text((10, img1.height + 310), "4", font=font, fill=(255, 255, 255)) # 添加箭头标注 arrow_size = 80 arrow_width = 40 arrow_draw = ImageDraw.Draw(merge_img) # 第一幅图到第二幅图的箭头 arrow_start = (img1.width, img1.height/2) arrow_end = (img1.width + 300, img1.height/2) arrow_draw.line((arrow_start[0], arrow_start[1], arrow_end[0] - arrow_size, arrow_end[1]), fill=(0, 0, 255), width=arrow_width) arrow_draw.polygon([(arrow_end[0] - arrow_size, arrow_end[1] - arrow_size), (arrow_end[0] - arrow_size, arrow_end[1] + arrow_size), (arrow_end[0], arrow_end[1])], fill=False, outline=(0, 0, 255), width=arrow_width)

您可以通过将 `arrow_draw.polygon` 函数的 `fill` 参数设置为 `False` 来绘制空心箭头。同时，您也需要将 `arrow_draw.line` 函数的宽度参数 `width` 改为箭头宽度的一半，来保证箭头的线和箭头的宽度相等。下面是修改后的代码：

import os
from PIL import Image, ImageDraw, ImageFont

img_dir = "/Users/wengjingjin/Desktop/annotation/org"
img_files = sorted(os.listdir(img_dir))

# 创建新的空白图像
img1 = Image.open(os.path.join(img_dir, img_files[0]))
img2 = Image.open(os.path.join(img_dir, img_files[1]))
img3 = Image.open(os.path.join(img_dir, img_files[2]))
img4 = Image.open(os.path.join(img_dir, img_files[3]))

merge_img = Image.new('RGB', (img1.width + img2.width + 300, img2.height + img3.height + 300), (255, 255, 255))

# 将四幅图像粘贴到新图像上
merge_img.paste(img1, (0, 0))
merge_img.paste(img2, (img1.width + 300, 0))
merge_img.paste(img3, (img1.width + 300, img2.height + 300))
merge_img.paste(img4, (0, img1.height + 300))

# 添加数字标注
font = ImageFont.truetype("arial.ttf", 50)
draw = ImageDraw.Draw(merge_img)
draw.text((10, 10), "1", font=font, fill=(255, 255, 255))
draw.text((img1.width + 310, 10), "2", font=font, fill=(255, 255, 255))
draw.text((img1.width + 310, img2.height + 310), "3", font=font, fill=(255, 255, 255))
draw.text((10, img1.height + 310), "4", font=font, fill=(255, 255, 255))

# 添加箭头标注
arrow_size = 80
arrow_width = 20   # 修改箭头线的宽度为箭头宽度的一半
arrow_draw = ImageDraw.Draw(merge_img)

# 第一幅图到第二幅图的箭头
arrow_start = (img1.width, img1.height/2)
arrow_end = (img1.width + 300, img1.height/2)
arrow_draw.line((arrow_start[0], arrow_start[1], arrow_end[0] - arrow_size, arrow_end[1]), fill=(0, 0, 255), width=arrow_width)
arrow_draw.polygon([(arrow_end[0] - arrow_size, arrow_end[1] - arrow_size),
                     (arrow_end[0] - arrow_size, arrow_end[1] + arrow_size),
                     (arrow_end[0], arrow_end[1])],
                    fill=False, outline=(0, 0, 255), width=arrow_width)

# 显示图像
merge_img.show()

在这个例子中，我们将 `arrow_width` 参数从原来的40改为20，来保证箭头的线和箭头的宽度相等。同时，我们将 `arrow_draw.polygon` 函数的 `fill` 参数设置为 `False`，来绘制空心箭头。