链接图表仅包含图例,图例的工作原理如下:
为了打开所有功能,我只需将信号 FILTERMODE 的值更改为
exclude。这就是我遇到困难的地方。 我在信号定义中尝试了以下方法:
"update": "event.shiftKey? 'include' : (length(data('selected'))? filtermode : 'exclude')",
这是行不通的。我相当确定这是由于竞争条件而发生的。
当我检查数据('source')的长度时,它仍然非空。所以事件的顺序如下:
现在可以先按住shift点击melon,然后再正常点击,滤镜模式就会切换。
{
"$schema": "https://vega.github.io/schema/vega/v5.json",
"description": "A scatter plot example with interactive legend and x-axis.",
"width": 200,
"height": 200,
"padding": 5,
"autosize": "pad",
"signals": [
{
"name": "shift",
"value": false,
"on": [
{
"events": "@legendSymbol:click, @legendLabel:click",
"update": "event.shiftKey",
"force": true
}
]
},
{
"name": "clicked",
"value": null,
"on": [
{
"events": "@legendSymbol:click, @legendLabel:click",
"update": "{value: datum.value}",
"force": true
}
]
},
{
"name": "filtermode",
"value": "exclude",
"on": [
{
"events": "@legendSymbol:click, @legendLabel:click",
"update": "event.shiftKey? 'include' : (length(data('selected') == 0)? filtermode : 'exclude')",
"force": true
}
]
}
],
"data": [
{
"name": "source",
"values": [
{"fruit": "apple"},
{"fruit": "plum"},
{"fruit": "pear"},
{"fruit": "melon"},
{"fruit": "grape"},
{"fruit": "strawberry"}
]
},
{
"name": "selected",
"on": [
{"trigger": "clicked && (event.shiftKey)", "remove": true},
{"trigger": "clicked && (event.shiftKey)", "insert": "clicked"},
{"trigger": "clicked && (!event.shiftKey)", "toggle": "clicked"}
]
}
],
"scales": [
{
"name": "color",
"type": "ordinal",
"range": {"scheme": "category10"},
"domain": {"data": "source", "field": "fruit"}
}
],
"legends": [
{
"stroke": "color",
"title": "Fruit",
"encode": {
"symbols": {
"name": "legendSymbol",
"interactive": true,
"update": {
"fill": {"value": "transparent"},
"strokeWidth": {"value": 2},
"opacity": [
{
"test": "filtermode == 'exclude' && !indata('selected', 'value', datum.value)",
"value": 1
},
{
"test": "filtermode == 'include' && indata('selected', 'value', datum.value)",
"value": 1
},
{"value": 0.15}
],
"size": {"value": 64}
}
},
"labels": {
"name": "legendLabel",
"interactive": true,
"update": {
"opacity": [
{
"test": "filtermode == 'exclude' && !indata('selected', 'value', datum.value)",
"value": 1
},
{
"test": "filtermode == 'include' && indata('selected', 'value', datum.value)",
"value": 1
},
{"value": 0.25}
]
}
}
}
}
]
}