js 矩形（不规则）中心点位置查找
摘要：function getPolygonAreaCenter(points) { var sum_x = 0; var sum_y = 0; var sum_area = 0; var p1 = points[1]; for (var i = 2; i < points.length; i++) {
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Pixi.js canvas生成image并保存下载
摘要：function convertCanvasToImage() { const image = renderer.plugins.extract.canvas(stage).toDataURL(); var link = document.createElement('a'); link.setAt
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