Deneb & PowerBI: Risk matrix Project - powerbi

Question

I am currently working on a risk matrix in PowerBI which I want to create with Deneb. The goal is a 3x3 matrix that allows cross-filtering. David already gave create support regarding the Vega lite code, however, some PowerBI specific questions remain.
My current progress can be seen here: PowerBi File.
Now I face the following challenges, which I am grateful for any help in overcoming:
The selected cell should be highlighted (see sheet 2 as an example). As an alternative it would be nice if at least the selected number can be highlighted. With "__ selected__" I unfortunately did not reach the objective.
It would be nice if a 0 appeared in the empty field.
There should be a space between each cell comparable to the one on page 2.
As always, I appreciate any solutions, hints or ideas. :)

Answer 1

OK, follow these steps to have a fully working and interactive risk matrix like the one below.
Create a Damage dimension table as follows
Create an Exposure dimension table as follows:
Create two relationships to your fact table as follows.
Create a measure as follows
Risk Count = COUNTROWS(Sheet1) +0
Create a new Deneb visual adding the two dimensions and the measure (make sure not to aggregate)
Place this code inside Deneb
{
"$schema": "https://vega.github.io/schema/vega-lite/v5.json",
"data": {"name": "dataset"},
"width": 500,
"height": 500,
"encoding": {
"y": {
"field": "Exposure",
"type": "ordinal",
"sort": ["high", "medium", "low"]
},
"x": {
"field": "Damage",
"type": "ordinal",
"sort": ["low", "medium", "high"],
"axis": {"labelAngle": 0}
}
},
"layer": [
{
"encoding": {
"opacity": {
"condition": {
"test": {"field": "__selected__", "equal": "off"},
"value": 0.3
}
}
},
"mark": {
"type": "rect",
"color": {
"expr": "(datum['Exposure'] == 'high' & datum['Damage'] == 'high') || (datum['Exposure'] == 'high' & datum['Damage'] == 'medium') || (datum['Exposure'] == 'medium' & datum['Damage'] == 'high') ? 'red' : (datum['Exposure'] == 'medium' & datum['Damage'] == 'medium') || (datum['Exposure'] == 'high' & datum['Damage'] == 'low') || (datum['Exposure'] == 'low' & datum['Damage'] == 'high') ? 'orange': 'green'"
}
}
},
{
"mark": {
"type": "text",
"fontSize": 16,
"fontWeight": "bold",
"color": "white"
},
"encoding": {"text": {"field": "Risk Count", "type": "quantitative"}}
}
],
"config": {"axis": {"grid": true, "tickBand": "extent"}}
}