ssthouse commented on a change in pull request #15095:
URL: https://github.com/apache/echarts/pull/15095#discussion_r650693834



##########
File path: test/pie-minus-value.html
##########
@@ -0,0 +1,105 @@
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+<html>
+    <head>
+        <meta charset="utf-8" />
+        <script src="lib/simpleRequire.js"></script>
+        <script src="lib/config.js"></script>
+        <meta name="viewport" content="width=device-width, initial-scale=1" />
+    </head>
+    <body>
+        <style>
+            h1 {
+                line-height: 60px;
+                height: 60px;
+                background: #146402;
+                text-align: center;
+                font-weight: bold;
+                color: #eee;
+                font-size: 14px;
+            }
+            .chart {
+                height: 600px;
+            }
+        </style>
+
+        <div id="main" class="chart"></div>
+        <script>
+            require(["echarts"], function (echarts) {
+                var chart = echarts.init(document.getElementById("main"));
+
+                chart.setOption({
+                    aria: {
+                        enabled: true,
+                    },
+                    title: {
+                        text: `The minus value slice should render like 0 
value,
+                        while the tooltip should show the origin minus value`,
+                        x: "center",
+                    },
+                    tooltip: {
+                        trigger: "item",
+                        formatter: "{a} <br/>{b} : {c} ({d}%)",
+                    },
+                    legend: {
+                        orient: "vertical",
+                        left: "left",
+                        data: [
+                            "直接访问",
+                            "邮件营销",
+                            "联盟广告",
+                            "视频广告(value is 0)",
+                            "搜索引擎(value is minus)",
+                        ],
+                    },
+                    series: [
+                        {
+                            name: "访问来源",
+                            type: "pie",
+                            radius: "55%",
+                            center: ["50%", "60%"],
+                            selectedMode: "single",
+                            data: [
+                                { value: 335, name: "直接访问" },

Review comment:
       @Ovilia this sounds reasonable, I'll give it a try~
   >  display an empty light gray circle when no data
   
   For the color issue, all three legends' are in blue because they are all 
filtered by `negativeDataFilter`. And the filtered legend's default color is 
blue
   




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