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Seeking help to troubleshoot Vega Lite area chart.I need to get the intersection area between "activity" and "stop" line correctly colored.
I did use transfrom to create two parts of the area to be calculated, with some logic to for choosing which line will be up or down. However, in the area chart, the interpolation of the area doesn't reflect the desired area to be colored.
Current State
Current State
Below is the vega lite code so far

{
"data":
{
"values": [{"Date":"2024-04-01","Activity":3,"Stops":10},{"Date":"2024-04-02","Activity":6,"Stops":13},{"Date":"2024-04-03","Activity":13,"Stops":11},{"Date":"2024-04-04","Activity":13,"Stops":14},{"Date":"2024-04-05","Activity":12,"Stops":16},{"Date":"2024-04-06","Activity":6,"Stops":11},{"Date":"2024-04-07","Activity":9,"Stops":8},{"Date":"2024-04-08","Activity":10,"Stops":9},{"Date":"2024-04-09","Activity":11,"Stops":5},{"Date":"2024-04-10","Activity":20,"Stops":10},{"Date":"2024-04-11","Activity":9,"Stops":6},{"Date":"2024-04-12","Activity":15,"Stops":8},{"Date":"2024-04-13","Activity":17,"Stops":4},{"Date":"2024-04-14","Activity":7,"Stops":5},{"Date":"2024-04-15","Activity":5,"Stops":8},{"Date":"2024-04-16","Activity":14,"Stops":4},{"Date":"2024-04-17","Activity":18,"Stops":3},{"Date":"2024-04-18","Activity":13,"Stops":13},{"Date":"2024-04-19","Activity":13,"Stops":5},{"Date":"2024-04-20","Activity":14,"Stops":3},{"Date":"2024-04-21","Activity":10,"Stops":8},{"Date":"2024-04-22","Activity":15,"Stops":12},{"Date":"2024-04-23","Activity":15,"Stops":6},{"Date":"2024-04-24","Activity":19,"Stops":9},{"Date":"2024-04-25","Activity":6,"Stops":9},{"Date":"2024-04-26","Activity":16,"Stops":6},{"Date":"2024-04-27","Activity":11,"Stops":3},{"Date":"2024-04-28","Activity":9,"Stops":10},{"Date":"2024-04-29","Activity":14,"Stops":6},{"Date":"2024-04-30","Activity":19,"Stops":9}]
},
"width":500,
"height":200,
"layer": [

{
"mark": {
"type": "line",
"point":{
"filled":true,
"fill":"#include },
"color":"#include "opacity": 1,
"tooltip": true
},
"encoding": {
"y": {
"field": "Activity"
}
}
},
{
"mark": {
"type": "line",
"point":{
"filled":true,
"fill":"#include },
"color":"#include "opacity": 1,
"tooltip": true
},
"encoding": {
"y": {
"field": "Stops"
}
}
},
{
"transform":[
{
"calculate":"datum['Stops'] =datum['Activity']?datum['Stops']:datum['Activity']", "as":"MinY"
}
],
"mark": {
"type": "area",
"line":true,
"point":true,
"color":"red", "opacity": 1,
"tooltip":true
},
"encoding": {

"y": {
"field": "Activity"
Source of the question:
https://stackoverflow.com/questions/7...

Question and source license information:
https://meta.stackexchange.com/help/l...
https://stackoverflow.com/