Python使用svgwrite生成SVG时如何消除相邻矩形之间的缝隙

使用Python的svgwrite库生成SVG格式图表，目标是根据由0和1组成的数组渲染对应黑白方块：0对应黑色方块，1对应白色方块。实现代码如下：

import numpy as np
import svgwrite

CSS_STYLES = """
    .background { fill: white; }
    .blacksquare { fill: black; }
    .whitesquare { fill: white; }
"""

def draw_board(dwg, data, block_sz):
    def group(classname):
        return dwg.add(dwg.g(class_=classname))
    
    # setup element groups
    white_squares = group("whitesquare")
    black_squares = group("blacksquare")
    
    board_height = data.shape[0]
    board_width = data.shape[1]
    
    # draw squares
    for x in range(board_width):
        for y in range(board_height):
            xc = x * block_sz
            yc = y * block_sz 
            square = dwg.rect(insert=(xc, yc), size=(block_sz, block_sz))
            (white_squares if data[y][x] == 1 else black_squares).add(square)

def main():
    data = np.array([[0, 1, 1, 0, 0], [1, 0, 1, 0, 0]]) # data represents an array of 0 and 1s. 0 means black square and 1 means white square

    block_sz = 10 # units per square
    num_y_blocks = data.shape[0]
    num_x_blocks = data.shape[1]
    BOARD_WIDTH = "{}cm".format(num_x_blocks * block_sz) # size of the PCB board
    BOARD_HEIGHT = "{}cm".format(num_y_blocks * block_sz) # size of the PCB board
    BOARD_SIZE = (BOARD_WIDTH, BOARD_HEIGHT)

    dwg = svgwrite.Drawing("output.svg", size=BOARD_SIZE)
    dwg.viewbox(0, 0, num_x_blocks * block_sz, num_y_blocks * block_sz)
    dwg.defs.add(dwg.style(CSS_STYLES))
    
    # set background
    dwg.add(dwg.rect(size=('100%','100%'), class_='background'))
    draw_board(dwg, data, block_sz)
    dwg.save()

if __name__== '__main__':
    main()

输入数组为[[0, 1, 1, 0, 0], [1, 0, 1, 0, 0]]运行代码后，生成的SVG文件中相邻矩形之间出现了白色缝隙。尝试过添加stroke属性、调整边距等方案，均未达到预期效果，需要实现01数组到指定尺寸无间隙SVG方格图的转换。

在CSS样式中添加shape-rendering: crispEdges;属性即可消除缝隙，修改后的CSS样式如下：

CSS_STYLES = """
    .background { fill: white; }
    .blacksquare { fill: black; shape-rendering: crispEdges;}
    .whitesquare { fill: white; shape-rendering: crispEdges;}
"""

修改后即可得到无间隙的SVG方格图。

内容的提问来源于stack exchange，提问作者mrtpk