如何将dataframe内容中指定的颜色分配给ggplot geom？

Question

我正在尝试绘制一些点的图形，后面有一些彩色的背景区域。我希望填充颜色依赖于“象限”名称，并在数据帧本身中指定(例如在下面的示例中，“冷漠”将是粉色的)。我曾尝试将此列赋给scale_fill_manual的values参数，但似乎没有效果，例如：

quadrant_names <- c("Indifferent", "Must be present", "Attractive", "Performance", "Dislike")
quadrant_xmin <- c(-1, 2, -1, 2, -2)
quadrant_xmax <- c(2, 4, 2, 4, 0)
quadrant_ymin <- c(0, 0, 2, 2, -2)
quadrant_ymax <- c(2, 2, 4, 4, 0)
quadrant_colors <-c("pink", "yellow", "blue", "green", "purple")

kano_quadrants <- data.frame(quadrant_names, quadrant_xmin, quadrant_xmax, quadrant_ymin, quadrant_ymax, quadrant_colors)

xpoints <- runif(10, -2, 4)
ypoints <- runif(10, -2, 4)
points <- data.frame(xpoints, ypoints)

  ggplot(data=points, aes(x=xpoints, y=ypoints)) +
    geom_rect(data=kano_quadrants, aes(xmin=quadrant_xmin, xmax=quadrant_xmax, x=NULL,
                                       ymin=quadrant_ymin, ymax=quadrant_ymax, y=NULL,
                                       fill=quadrant_names), alpha=0.2) +
    geom_point() +
    geom_text(data=kano_quadrants, aes(label=quadrant_names, 
              y=(quadrant_ymin+quadrant_ymax)/2, 
              x=(quadrant_xmin+quadrant_xmax)/2))+
    geom_hline(yintercept=0) +
    geom_vline(xintercept=0) +
    theme_bw() +
    scale_fill_manual(values=kano_quadrants$quadrant_colors)

结果如下：

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如何才能让它将填充颜色分配给数据帧中指定的适当级别的quadrant_name，而不是随机指定？

Answer 1

将fill映射到quadrant_colors并使用scale_fill_identity()

library(ggplot2)
ggplot(data=points, aes(x=xpoints, y=ypoints)) +
  geom_rect(data=kano_quadrants, aes(xmin=quadrant_xmin, xmax=quadrant_xmax, x=NULL,
                                     ymin=quadrant_ymin, ymax=quadrant_ymax, y=NULL,
                                     fill=quadrant_colors), alpha=0.2) +
  geom_point() +
  geom_text(data=kano_quadrants, aes(label=quadrant_names,
                                     y=(quadrant_ymin+quadrant_ymax)/2,
                                     x=(quadrant_xmin+quadrant_xmax)/2))+
  geom_hline(yintercept=0) +
  geom_vline(xintercept=0) +
  theme_bw() +
  scale_fill_identity()

​

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