How to fill wx-chart with canvas

Mini Program has a view that uses ring, in wx-chart, but I don"t know why the picture in canvas is not full

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1ec79fd-2e68.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ec79fd-2e68.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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