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static/lib/Highcharts-10.2.1/es-modules/Extensions/SeriesLabel/SeriesLabelUtilities.js

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+/* *
+ *
+ *  (c) 2009-2021 Torstein Honsi
+ *
+ *  License: www.highcharts.com/license
+ *
+ *  !!!!!!! SOURCE GETS TRANSPILED BY TYPESCRIPT. EDIT TS FILE ONLY. !!!!!!!
+ *
+ * */
+'use strict';
+/* *
+ *
+ *  Functions
+ *
+ * */
+/**
+ * Counter-clockwise, part of the fast line intersection logic.
+ *
+ * @private
+ * @function ccw
+ */
+function ccw(x1, y1, x2, y2, x3, y3) {
+    var cw = ((y3 - y1) * (x2 - x1)) - ((y2 - y1) * (x3 - x1));
+    return cw > 0 ? true : !(cw < 0);
+}
+/**
+ * Detect if two lines intersect.
+ *
+ * @private
+ * @function intersectLine
+ */
+function intersectLine(x1, y1, x2, y2, x3, y3, x4, y4) {
+    return ccw(x1, y1, x3, y3, x4, y4) !== ccw(x2, y2, x3, y3, x4, y4) &&
+        ccw(x1, y1, x2, y2, x3, y3) !== ccw(x1, y1, x2, y2, x4, y4);
+}
+/**
+ * Detect if a box intersects with a line.
+ *
+ * @private
+ * @function boxIntersectLine
+ */
+function boxIntersectLine(x, y, w, h, x1, y1, x2, y2) {
+    return (intersectLine(x, y, x + w, y, x1, y1, x2, y2) || // top of label
+        intersectLine(x + w, y, x + w, y + h, x1, y1, x2, y2) || // right
+        intersectLine(x, y + h, x + w, y + h, x1, y1, x2, y2) || // bottom
+        intersectLine(x, y, x, y + h, x1, y1, x2, y2) // left of label
+    );
+}
+/**
+ * @private
+ */
+function intersectRect(r1, r2) {
+    return !(r2.left > r1.right ||
+        r2.right < r1.left ||
+        r2.top > r1.bottom ||
+        r2.bottom < r1.top);
+}
+/* *
+ *
+ *  Default Export
+ *
+ * */
+var SeriesLabelUtilities = {
+    boxIntersectLine: boxIntersectLine,
+    intersectRect: intersectRect
+};
+export default SeriesLabelUtilities;