How to calculate graph union

[wangchao0724]

How to calculate the union of graphs and obtain the vertex coordinates of the union graph to draw a new polygon

before: [ [ [600, 100], [1000, 100], [1000, 500], [600, 500], ], [ [800, 50], [1200, 350], [400, 350], ], ]

after: [ [ [600, 100], [735, 100], [800, 50], [865, 100], [1000, 100], [1000, 200], [1200, 350], [1000, 350], [1000, 500], [1000, 500], [600, 500], [600, 350], [400, 350], [600, 200], ], ]

[Jancheng-z]

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