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ems-frontend/node_modules/zrender/lib/contain/windingLine.js

@@ -0,0 +1,15 @@
+export default function windingLine(x0, y0, x1, y1, x, y) {
+    if ((y > y0 && y > y1) || (y < y0 && y < y1)) {
+        return 0;
+    }
+    if (y1 === y0) {
+        return 0;
+    }
+    var t = (y - y0) / (y1 - y0);
+    var dir = y1 < y0 ? 1 : -1;
+    if (t === 1 || t === 0) {
+        dir = y1 < y0 ? 0.5 : -0.5;
+    }
+    var x_ = t * (x1 - x0) + x0;
+    return x_ === x ? Infinity : x_ > x ? dir : 0;
+}