Renders a chord-style relationship diagram using the Apache ECharts graph series type.
ECHARTSCHORD — set as ReportType in def_report.
def Render(self, Param1="", Param2="", Param3="") -> str:
Inherited from ObjReportEchartsbase. Param1, Param2, and Param3 are forwarded in the RPC payload for SQL token substitution. Returns an HTML string containing a styled panel and an ECharts initialisation script.
Uses the Apache ECharts JS library. ECharts 5 does not have a native chord series type; this report renders via the graph series with force layout (see ObjReportEchartsbase._build_graph_like_option). The SQL query must return rows with columns source, target, and value. Node sizes are scaled proportionally to their total link weight.