[GitHub] [incubator-echarts] SalCat opened a new issue #9906: No way to bring up ECharts-GL tooltip on mobile device

[GitBox <gi...@apache.org>]

SalCat opened a new issue #9906: No way to bring up ECharts-GL tooltip on mobile device
URL: https://github.com/apache/incubator-echarts/issues/9906
 
 
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   ## General Questions
   
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   ## Issue Type
   
   <!-- Add `x` for the ones that is true with you, e.g.: [x] I have ... -->
   
   - [ ] 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
   - [x ] Since tooltip comes up via a mouse hover event, there’s no way to bring up tooltip on a ECharts-GL chart in a mobile device.Please enhance ECharts-GL extension so that a long press triggers the tooltip, followed by tracking the user touch.
   - [ ] 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
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   - [ ] 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
   There’s currently no way to bring up a tooltip for a 3D chart using ECharts-GL extension on a mobile device.
   <!-- Use one sentence to describe what you want and what's wrong. 一句话描述问题。 -->
   
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   ### Expected Behavior
   I expect that a 3D chart’s tooltip can be shown on a mobile device. Currently there’s no way to do that, since the tooltip is triggered by a mouse hover event, which doesn’t exist on a mobile device such as an iPhone or iPad. 
   
   Also I expect it to work the way other chart packages tooltips work on mobile, first you do a long touch, which triggers the tooltip to come up and then while keeping your finger down move it around and have the tooltip follow the touch. This is absolutely needed for a mobile device.
   
   You have a workaround for your 2D charts, please come up with one for your 3D charts.
   
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   ### Current Behavior
   
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   For a 3D chart on an iPhone or iPad, touch events are only used for rotating or zooming on the device. If I try to check what a particular point is on a surface or 3D bar chart, there’s no way to trigger the tooltip. This makes your 3D charts not very useful on mobile.
   
   ### Online Example
   Just bring up any of the ECharts-GL 3D demo charts on an iPhone, iPad or Android device and try to bring up a tooltip. You cannot! Try this one on an iPhone or iPad:
   https://ecomfe.github.io/echarts-examples/public/editor.html?c=simple-surface&gl=1
   
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   ## Topics
   
   <!-- Check those topics that are related. 选择相关主题。
   - [ ] Legend
   - [x] Tooltip
   - [ ] Event
   - [ ] Performance
   - [ ] SVG
   - [ ] Map
   - [x] ECharts GL
   - [ ] Third-party libraries, e.g.: Vue.js, React
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   ## Anything Else We Need to Know
   
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   ## Environment
   
   - ECharts GL - all versions
   
   - [ ] 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}
   

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