confusing API for heatmap legend

When trying to customize the legend for a heatmap I would expect that to be done through the layout similar to other trace types.

plot_ly(
  z = volcano, 
  type = "heatmap",
) %>%
  layout(
    legend = list(
      title = list(
        text = "custom title"
      )
    )
  )

After digging around for a while and examining the output of plotly_build() %>% plotly_json() I found that this is done through the top level colorbar instead.

plot_ly(
  z = volcano, 
  type = "heatmap",
  colorbar = list(
    title = "custom title"
  )
) 

I would say that if the interface for this needs to be different than for other traces, that should be documented on the heatmap page. Even better may be to standardize the approach so that users always know to go to layout for this type of thing.

I'm also curious why colorbar title is shown as a deprecated attribute from schema().

从 issue 中链接的 R 热力图页面开始，检查其中记录的示例，以及页面所述的 plotly_build() 和 plotly_json() 输出。记录热力图图例的自定义使用顶层 colorbar，包括 schema() 弃用的相关细节；当新贡献者能够找到并遵循记录的接口时，即表示完成。