Remove 🔪 obsolete polygon.multitester function [1852]

- Put throwing an error in place should it be called with this
  parameter shape still. See PR #2944 for the discussion.

Author: rmoestl

src/lib/polygon.js

@@ -31,7 +31,11 @@ var polygon = module.exports = {};
  *          returns boolean: is pt inside the polygon (including on its edges)
  */
 polygon.tester = function tester(ptsIn) {
-    if(Array.isArray(ptsIn[0][0])) return polygon.multitester(ptsIn);
+
+    // Throw an error if any code tries to pass this no
+    // longer supported argument shape. The local multitester became
+    // obsolete when introducing click-to-select in PR #2944.
+    if(Array.isArray(ptsIn[0][0])) throw new Error('multitester called!');
 
     var pts = ptsIn.slice(),
         xmin = pts[0][0],
@@ -174,51 +178,6 @@ polygon.tester = function tester(ptsIn) {
     };
 };
 
-// TODO Somewhat redundant to multiTester in 'lib/select.js'
-/**
- * Test multiple polygons
- */
-polygon.multitester = function multitester(list) {
-    var testers = [],
-        xmin = list[0][0][0],
-        xmax = xmin,
-        ymin = list[0][0][1],
-        ymax = ymin;
-
-    for(var i = 0; i < list.length; i++) {
-        var tester = polygon.tester(list[i]);
-        tester.subtract = list[i].subtract;
-        testers.push(tester);
-        xmin = Math.min(xmin, tester.xmin);
-        xmax = Math.max(xmax, tester.xmax);
-        ymin = Math.min(ymin, tester.ymin);
-        ymax = Math.max(ymax, tester.ymax);
-    }
-
-    function contains(pt, arg) {
-        var yes = false;
-        for(var i = 0; i < testers.length; i++) {
-            if(testers[i].contains(pt, arg)) {
-                // if contained by subtract polygon - exclude the point
-                yes = testers[i].subtract === false;
-            }
-        }
-
-        return yes;
-    }
-
-    return {
-        xmin: xmin,
-        xmax: xmax,
-        ymin: ymin,
-        ymax: ymax,
-        pts: [],
-        contains: contains,
-        isRect: false,
-        degenerate: false
-    };
-};
-
 /**
  * Test if a segment of a points array is bent or straight
  *