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Chart Y Axis auto scaling too agressive #1898

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bugSomething isn't workingneeds-triageNeeds looking at to decide what to do
@Steve-Mcl

Description

@Steve-Mcl

Current Behavior

@colinl

I think the new auto scaling may be too aggressive?

Look at this demo when both are the same value, it auto scales to the point where the lowest bar is hidden.

Image

Expected Behavior

Unsure.

How did chartjs handle this?

How does echarts handle this by default?

Steps To Reproduce

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msg.series","order":4,"chartType":"bar","category":"series","categoryType":"msg","xAxisLabel":"","xAxisProperty":"topic","xAxisPropertyType":"msg","xAxisType":"category","xAxisFormat":"","xAxisFormatType":"auto","xmin":"","xmax":"","yAxisLabel":"","yAxisProperty":"","yAxisPropertyType":"property","ymin":"","ymax":"","bins":"","action":"append","stackSeries":false,"pointShape":"circle","pointRadius":4,"showLegend":true,"removeOlder":1,"removeOlderUnit":"3600","removeOlderPoints":"","colors":["#37b067","#edb40e","#527ce0","#e26060","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"textColor":["#666666"],"textColorDefault":true,"gridColor":["#e5e5e5"],"gridColorDefault":true,"width":6,"height":8,"className":"","interpolation":"linear","x":800,"y":1240,"wires":[[]]},{"id":"dd772809337e4f4e","type":"change","z":"b508b2cf4781499a","g":"e4e54f940c26aa1d","name":"","rules":[{"t":"set","p":"series","pt":"msg","to":"Green","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":560,"y":1160,"wires":[["a3d4b94547d8230a"]]},{"id":"c45592fb7b71a291","type":"change","z":"b508b2cf4781499a","g":"e4e54f940c26aa1d","name":"","rules":[{"t":"set","p":"series","pt":"msg","to":"Yellow","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":560,"y":1200,"wires":[["a3d4b94547d8230a"]]},{"id":"0a2f1cb3352df76b","type":"change","z":"b508b2cf4781499a","g":"e4e54f940c26aa1d","name":"","rules":[{"t":"set","p":"series","pt":"msg","to":"Green","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":560,"y":1280,"wires":[["a3d4b94547d8230a"]]},{"id":"13a0437e5275bc22","type":"change","z":"b508b2cf4781499a","g":"e4e54f940c26aa1d","name":"","rules":[{"t":"set","p":"series","pt":"msg","to":"Yellow","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":560,"y":1320,"wires":[["a3d4b94547d8230a"]]},{"id":"ce36bef202fba49c","type":"ui-button","z":"b508b2cf4781499a","g":"e4e54f940c26aa1d","group":"8599b71565f22abf","name":"","label":"Clear Chart Data","order":9,"width":0,"height":0,"emulateClick":false,"tooltip":"","color":"","bgcolor":"","className":"","icon":"","iconPosition":"left","payload":"[]","payloadType":"json","topic":"topic","topicType":"msg","buttonColor":"red","textColor":"white","iconColor":"","x":550,"y":1240,"wires":[["a3d4b94547d8230a"]]},{"id":"9bcb1ec98cd0b037","type":"ui-slider","z":"b508b2cf4781499a","g":"e4e54f940c26aa1d","group":"8599b71565f22abf","name":"Bar 1","label":"Slider 1 Green","tooltip":"","order":5,"width":0,"height":0,"passthru":false,"outs":"all","topic":"slider-1","topicType":"str","thumbLabel":"true","showTicks":"always","min":0,"max":10,"step":1,"className":"","iconPrepend":"","iconAppend":"","color":"#37b067","colorTrack":"#37b067","colorThumb":"#37b067","x":410,"y":1160,"wires":[["dd772809337e4f4e"]]},{"id":"468235da1077fccb","type":"ui-slider","z":"b508b2cf4781499a","g":"e4e54f940c26aa1d","group":"8599b71565f22abf","name":"Bar 2","label":"Slider 1 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Desktop","px":768,"cols":9},{"name":"Desktop","px":1024,"cols":12}],"order":2,"className":"","visible":true,"disabled":false},{"id":"72c1e5a9ec204878","type":"ui-base","name":"FlowFuse Demo Dashboard","path":"/dashboard","appIcon":"","includeClientData":true,"acceptsClientConfig":["ui-notification","ui-control","ui-chart","ui-audio"],"showPathInSidebar":false,"headerContent":"page","navigationStyle":"default","titleBarStyle":"default","showReconnectNotification":true,"notificationDisplayTime":5,"showDisconnectNotification":true,"allowInstall":false},{"id":"5075a7d8e4947586","type":"ui-theme","name":"Default Theme","colors":{"surface":"#ffffff","primary":"#0094CE","bgPage":"#eeeeee","groupBg":"#ffffff","groupOutline":"#cccccc"},"sizes":{"pagePadding":"12px","groupGap":"12px","groupBorderRadius":"4px","widgetGap":"12px"}},{"id":"b7efd40c3fe2dd6f","type":"global-config","env":[],"modules":{"@flowfuse/node-red-dashboard":"1.29.0"}}]

Environment

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  • Node-RED version:
  • Node.js version:
  • npm version:
  • Platform/OS:
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