13.12 甘特图

项目管理必备，如图所示，本项目拆分成7个任务，一共使用3种项目资源

# https://plotly.com/r/gantt/
# 项目拆解为一系列任务，每个任务的开始时间，持续时间和资源类型
df <- data.frame(
  task = paste("Task", 1:8),
  start = as.Date(c(
    "2016-01-01", "2016-02-20", "2016-01-01",
    "2016-04-10", "2016-06-09", "2016-04-10",
    "2016-09-07", "2016-11-26"
  )),
  duration = c(50, 25, 100, 60, 30, 150, 80, 10),
  resource = c("A", "B", "C", "C", "C", "A", "B", "B")
) %>%
  transform(end = start + duration) %>%
  transform(y = 1:nrow(.))

plot_ly(data = df) %>%
  add_segments(
    x = ~start, xend = ~end,
    y = ~y, yend = ~y,
    color = ~resource,
    mode = "lines",
    colors = "Greys", 
    line = list(width = 20),
    showlegend = F,
    hoverinfo = "text",
    text = ~ paste(
      " 任务: ", task, "<br>",
      "启动时间: ", start, "<br>",
      "周期: ", duration, "天<br>",
      "资源: ", resource
    )
  ) %>%
  layout(
    xaxis = list(
      showgrid = F,
      title = list(text = "")
    ),
    yaxis = list(
      showgrid = F,
      title = list(text = ""),
      tickmode = "array",
      tickvals = 1:nrow(df),
      ticktext = unique(df$task),
      domain = c(0, 0.9)
    ),
    annotations = list(
      list(
        xref = "paper", yref = "paper",
        x = 0.80, y = 0.1,
        text = paste0(
          "项目周期: ", sum(df$duration), " 天<br>",
          "资源类型: ", length(unique(df$resource)), " 个<br>"
        ),
        font = list(size = 12),
        ax = 0, ay = 0,
        align = "left"
      ),
      list(
        xref = "paper", yref = "paper",
        x = 0.1, y = 1,
        xanchor = "left",
        text = "项目资源管理",
        font = list(size = 20),
        ax = 0, ay = 0,
        align = "left",
        showarrow = FALSE
      )
    )
  )

图 13.10: 甘特图