Gnuplot垂直周对齐日历绘制问题求助

一、解决月份标签错位（缺失1月、重复12月） #

• 强制从当年1月1日初始化起始日期，避免因起始时间设置错误跳过1月：

  start_year = 2024
  start_date = strptime("%Y-%m-%d", sprintf("%d-01-01", start_year))
  

• 用1到12的循环遍历所有月份，确保每个月仅生成一次标签，杜绝12月重复输出：

  do for [m=1:12] {
      month_start = strptime("%Y-%m-%d", sprintf("%d-%02d-01", start_year, m))
      week_num = int((month_start - start_date)/ (7*86400))
      set label strftime("%b", month_start) at -0.5, week_num center
  }
  

二、解决部分行向右偏移 #

• 统一周数计算逻辑，以当年1月1日为基准计算每个日期所属周数，确保每行（每周）的y坐标唯一且连续：

  week_num = int((current_date - start_date)/ (7*86400))
  

• 固定x轴范围为0-6（对应一周7天），每个日期的x坐标直接使用星期几的数值（如strftime("%w", d)返回0-6对应周日到周六），避免累积偏移：

  set xrange [0:6]
  day_of_week = int(strftime("%w", current_date))
  plot current_date with labels text strftime("%d", current_date) at day_of_week, week_num center
  

• 检查并移除可能导致偏移的自定义offset设置，确保网格和坐标系统对齐。

完整示例代码 #

set terminal pngcairo size 800,1200
set output "vertical_aligned_calendar.png"

set xrange [0:6]
set yrange [0:53]
set grid x y
set xtics ("Sun" 0, "Mon" 1, "Tue" 2, "Wed" 3, "Thu" 4, "Fri" 5, "Sat" 6)
set ytics 1
unset key

start_year = 2024
seconds_per_day = 86400
start_date = strptime("%Y-%m-%d", sprintf("%d-01-01", start_year))
end_date = strptime("%Y-%m-%d", sprintf("%d-12-31", start_year))

# 绘制月份标签
do for [m=1:12] {
    month_start = strptime("%Y-%m-%d", sprintf("%d-%02d-01", start_year, m))
    week_num = int((month_start - start_date)/(7*seconds_per_day))
    set label strftime("%b", month_start) at -0.5, week_num center font ",10"
}

# 绘制日期
do for [d=start_date:end_date:seconds_per_day] {
    day_of_week = int(strftime("%w", d))
    week_num = int((d - start_date)/(7*seconds_per_day))
    set label strftime("%d", d) at day_of_week, week_num center font ",8"
}

plot NaN # 触发绘图渲染

内容的提问来源于stack exchange，提问作者Unix