如何根据 y 位置动态更改标记点的颜色

Question

我在 R

中使用 highchart js 库制作了以下互动图

library(highcharter)
hchart(data.frame('Date' = seq(Sys.Date(), Sys.Date() - 10, by = '-1 day'), 'Value' = sample(c(-1, 1), 11, replace = T), 'variable' = 'aa') %>% mutate(color = ifelse(Value < 0, "#41c83b", "#E0245E")), 
                            "line", 
                            zIndex = 1, opacity = 0.9,
                            hcaes(x = Date, y = Value, group = variable),
                            zones = list(list(value = 0, color = hex_to_rgba("#41c83b", 1)), list(color = hex_to_rgba("#E0245E", 1))),
                            marker = list(fillColor = "#fff", lineColor = '#000', radius = 5, lineWidth = 2))

我想根据 y-value 的动态线条颜色来匹配 markers 的颜色。当前所有标记的颜色设置为 black 我不想要的。

关于如何动态更改颜色的任何指示都将非常有帮助

Answer 1

API 中没有这样的选项。您需要编写一些自定义代码。最简单的方法是使用 chart.events.load 事件，遍历系列的所有点，找到红色或绿色区域中的点并分别更新它们的标记选项。要在 R 中编写 JavaScript 代码，可以使用 JS("") 函数。

完整的示例代码如下：

library(highcharter)
hchart(data.frame('Date' = seq(Sys.Date(), Sys.Date() - 10, by = '-1 day'), 'Value' = sample(c(-1, 1), 11, replace = T), 'variable' = 'aa') %>%
         mutate(color = ifelse(Value < 0, "#41c83b", "#E0245E")), 
       "line", 
       zIndex = 1, opacity = 0.9,
       hcaes(x = Date, y = Value, group = variable),
       zones = list(list(value = 0, color = hex_to_rgba("#41c83b", 1)), list(color = hex_to_rgba("#E0245E", 1))),
       marker = list(fillColor = "#fff", radius = 5, lineWidth = 2)) %>%
  hc_chart(events = list(load = JS("function () {
    this.series[0].points.forEach(function (point) {
      if (point.y > 0) {
        point.update({
          marker: {
            lineColor: 'red'
          }
        }, false);
      } else {
        point.update({
          marker: {
            lineColor: 'green'
          }
        }, false);
      }
    });
    this.redraw();
  }")))

API参考：https://api.highcharts.com/highcharts/chart.events.load https://api.highcharts.com/class-reference/Highcharts.Chart#update https://api.highcharts.com/class-reference/Highcharts.Point#update

如何根据 y 位置动态更改标记点的颜色

How to change the color of marker-points dynamically based on y-position

javascript

highcharts

r-highcharter