disease_intensity.R

library(tidyverse)

dat <- expand.grid(sev = seq(0.01, 0.99, 0.01), 
                   inc = seq(0.01, 0.99, 0.01)) %>% 
  mutate(int = inc*sev)

dat %>% 
  ggplot(aes(inc, sev, fill= int)) + 
  geom_tile() +
  viridis::scale_fill_viridis(discrete=FALSE, direction = -1)+
  theme_bw() %+replace% 
  theme(plot.caption = element_text(hjust = 0, size = 10, face= "italic"))+
  labs(
    # x="Disease incidence", y="Disease severity", fill = "Disease\nintensity", 
    # caption = "Disease intensity = Disease incidence * Disease severity"
    x="Incidencia", y="Severidad", fill = "Intensidad",
    caption = "Intensidad = Incidencia  * Severidad (ambos en proporcion 0 a 1)"
    )+
  geom_point(data = data.frame(sev = c(0.1,0.9), inc=c(0.9,0.1), int=0.09), 
             aes(x=inc, y=sev))+
  geom_text(data = data.frame(sev = c(0.9,0.1), inc=c(0.1,0.9), int=0.09, lab=c("A", "B")), 
             aes(label=lab, vjust = 0, hjust = -0.5))