• I am using English in this issue. 在这个 Issue 中我使用了英文（强烈建议）。

General Questions

• Required: I have read the document and examples and tried to solve it by myself. （必填）我读过了文档和教程，并且曾试图自己解决问题。
• Required: I have searched for similar issues and that didn't help. （必填）我搜索过 issue 但是没有帮助。
• Required: I have tried with the latest version of ECharts and still have this problem. （必填）我试过最新版本的 ECharts，还是存在这个问题。

In this issue, I have provided information with: 在这个 issue 中我提供了以下信息：

• Required: issue type；（必填）issue 类型
• Required: one sentence description in issue details；（必填）一句话的问题描述
• Required: demo；（必填）能反映问题的例子（如果你想提问或报 bug）
• Required: ECharts version；ECharts 版本

Issue Type

• I have a question to ask about how to use ECharts to ...；我想提问如何使用 ECharts 实现某功能
• I have a bug to report；我想要报 bug
• I have a feature to request, e.g.: I'd like a new feature that ...；我需要一个新功能
• I have a feature to enhance, e.g.: The current feature should be improved in the way that ...；我希望改进某个功能
• There's something wrong with the documents；文档有些问题
• Others, or I'm not sure which issue types to choose here；其他，或我不知道应该选什么类型

Issue Details

在echart 4.0版本中，series type 为pie 时，使用startAngle和endAngle设置起始刻度无效，

Expected Behavior

使用pie绘制出半圆环形图

Current Behavior

配置项无效果

Online Example

option = {
    tooltip: {
        trigger: 'item',
        formatter: "{a} <br/>{b}: {c} ({d}%)"
    },
    legend: {
        orient: 'vertical',
        x: 'left',
        data:['直接访问','邮件营销','联盟广告','视频广告','搜索引擎']
    },
    series: [
        {
            name:'访问来源',
            type:'pie',
            radius: ['50%', '70%'],
            startAngle:0,
            endAngle:180,
            avoidLabelOverlap: false,
            label: {
                normal: {
                    show: false,
                    position: 'center'
                },
                emphasis: {
                    show: true,
                    textStyle: {
                        fontSize: '30',
                        fontWeight: 'bold'
                    }
                }
            },
            labelLine: {
                normal: {
                    show: false
                }
            },
            data:[
                {value:335, name:'直接访问'},
                {value:310, name:'邮件营销'},
                {value:234, name:'联盟广告'},
                {value:135, name:'视频广告'},
                {value:1548, name:'搜索引擎'}
            ]
        }
    ]
};

Topics

• Legend
• Tooltip
• Event
• Performance
• SVG
• Map
• ECharts GL
• Third-party libraries, e.g.: Vue.js, React

Anything Else We Need to Know

Environment

echart 4.2

• ECharts version；ECharts 版本: {DESCRIBE_HERE}

• It happens only on certain browsers or operating systems. 对于特定浏览器或操作系统才会出现的问题，请提供相应环境信息：{BROWSER_VERSION_OR_OS_INFORMATION_HERE}