我有一个客户希望能够在Rshiny中的徒手绘制(ggplot)图上“徒手画”。我说过要在绘图图形上使用套索选择按钮,但是他们不满意,如果您单击图形上的其他位置,它将删除第一个套索。使用这个post,我能够处理一个可以绘制的ggplot。但是,由于我不知道下面的ui中的悬停选项,我无法使其与plotly一起使用。我喜欢一些关于如何使用plotly进行输入,如何改进代码使其更快,和/或如何不以(1,1)的任意值开头的输入。可以理解,这仅在数据完全为数字时才有效。如果说数据中的第一列是c(“ a”,“ b”,“ c”)而不是c(1,2,3),如我在下面所述,是否有办法做到这一点?
注:第一次单击时,该行从(1,1)开始,因为ggplot需要一个值来绘制图形,但无功输入需要一个图形。为了解决这个循环,我只是将列放在c(1,vals $ x)...希望这是有道理的。
library(shiny)
library(tidyverse)
ui <- fluidPage(
actionButton("reset", "reset"),
plotOutput("plot",
hover=hoverOpts(id = "hover", delay = 300, delayType = "throttle", clip = TRUE, nullOutside = TRUE),
click="click"))
server <- function(input, output, session) {
vals = reactiveValues(x=NULL, y=NULL)
draw = reactiveVal(FALSE)
observeEvent(input$click, handlerExpr = {
temp <- draw(); draw(!temp)
if(!draw()) {
vals$x <- c(vals$x, NA)
vals$y <- c(vals$y, NA)
}})
observeEvent(input$reset, handlerExpr = {
vals$x <- NULL; vals$y <- NULL
})
observeEvent(input$hover, {
if (draw()) {
vals$x <- c(vals$x, input$hover$x)
vals$y <- c(vals$y, input$hover$y)
}})
output$plot= renderPlot({
Data<-cbind(c(1,2,3),c(2,3,4))%>%as.data.frame()
d<-cbind(c(1,vals$x),c(1,vals$y))%>%as.data.frame()
ggplot(data=Data)+geom_point(data=Data,aes(x=V1,y=V2))+
geom_path(data=d,aes(x=V1,y=V2))+xlim(c(0,15))+ylim(c(0,15))
})
}
shinyApp(ui, server)
答案 0 :(得分:2)
首先,您可以通过按shift
来选择多个套索选择。
以下是对我的答案here的修改-因此基于plot_ly
/ plotlyProxy
,不使用ggplotly
修改现有的绘图对象(无需重新渲染) 。由于GitHub issue和PR上正在进行一些相关工作,因此以下答案可能不是100%可靠的(例如,缩放似乎使事情变得混乱-您可能要停用它),并且可能变得已过时。
不过,请检查以下内容:
library(plotly)
library(shiny)
library(htmlwidgets)
ui <- fluidPage(
plotlyOutput("myPlot"),
verbatimTextOutput("click")
)
server <- function(input, output, session) {
js <- "
function(el, x){
var id = el.getAttribute('id');
var gd = document.getElementById(id);
Plotly.plot(id).then(attach);
function attach() {
var xaxis = gd._fullLayout.xaxis;
var yaxis = gd._fullLayout.yaxis;
var coordinates = [null, null]
gd.addEventListener('click', function(evt) {
var bb = evt.target.getBoundingClientRect();
var x = xaxis.p2d(evt.clientX - bb.left);
var y = yaxis.p2d(evt.clientY - bb.top);
var coordinates = [x, y];
Shiny.setInputValue('clickposition', coordinates);
});
gd.addEventListener('mousemove', function(evt) {
var bb = evt.target.getBoundingClientRect();
var x = xaxis.p2d(evt.clientX - bb.left);
var y = yaxis.p2d(evt.clientY - bb.top);
var coordinates = [x, y];
Shiny.setInputValue('mouseposition', coordinates);
});
};
}
"
output$myPlot <- renderPlotly({
plot_ly(type = "scatter", mode = "markers") %>% layout(
xaxis = list(range = c(0, 100)),
yaxis = list(range = c(0, 100))) %>%
onRender(js)
})
myPlotProxy <- plotlyProxy("myPlot", session)
followMouse <- reactiveVal(FALSE)
traceCount <- reactiveVal(0L)
observeEvent(input$clickposition, {
followMouse(!followMouse())
if(followMouse()){
plotlyProxyInvoke(myPlotProxy, "addTraces", list(x = list(input$clickposition[1]), y = list(input$clickposition[2])))
traceCount(traceCount()+1)
}
})
observe({
if(followMouse()){
plotlyProxyInvoke(myPlotProxy, "extendTraces", list(x = list(list(input$mouseposition[1])), y = list(list(input$mouseposition[2]))), list(traceCount()))
}
})
}
shinyApp(ui, server)
如果您想使用单个跟踪:
library(plotly)
library(shiny)
library(htmlwidgets)
ui <- fluidPage(
plotlyOutput("myPlot"),
verbatimTextOutput("click")
)
server <- function(input, output, session) {
js <- "
function(el, x){
var id = el.getAttribute('id');
var gd = document.getElementById(id);
Plotly.plot(id).then(attach);
function attach() {
var xaxis = gd._fullLayout.xaxis;
var yaxis = gd._fullLayout.yaxis;
var coordinates = [null, null]
gd.addEventListener('click', function(evt) {
var bb = evt.target.getBoundingClientRect();
var x = xaxis.p2d(evt.clientX - bb.left);
var y = yaxis.p2d(evt.clientY - bb.top);
var coordinates = [x, y];
Shiny.setInputValue('clickposition', coordinates);
});
gd.addEventListener('mousemove', function(evt) {
var bb = evt.target.getBoundingClientRect();
var x = xaxis.p2d(evt.clientX - bb.left);
var y = yaxis.p2d(evt.clientY - bb.top);
var coordinates = [x, y];
Shiny.setInputValue('mouseposition', coordinates);
});
};
}
"
output$myPlot <- renderPlotly({
plot_ly(type = "scatter", mode = "markers") %>% layout(
xaxis = list(range = c(0, 100)),
yaxis = list(range = c(0, 100))) %>%
onRender(js)
})
myPlotProxy <- plotlyProxy("myPlot", session)
followMouse <- reactiveVal(FALSE)
clickCount <- reactiveVal(0L)
observeEvent(input$clickposition, {
followMouse(!followMouse())
clickCount(clickCount()+1)
if(clickCount() == 1){
plotlyProxyInvoke(myPlotProxy, "addTraces", list(x = list(input$clickposition[1]), y = list(input$clickposition[2])))
}
})
observe({
if(followMouse()){
plotlyProxyInvoke(myPlotProxy, "extendTraces", list(x = list(list(input$mouseposition[1])), y = list(list(input$mouseposition[2]))), list(1))
} else {
plotlyProxyInvoke(myPlotProxy, "extendTraces", list(x = list(list(NA)), y = list(list(NA))), list(1))
}
})
}
shinyApp(ui, server)