find min/max using Lib.aggNums instead of sorting arrays

Author: etpinard

src/traces/carpet/plot.js

@@ -173,20 +173,22 @@ function drawAxisLabels(gd, xaxis, yaxis, trace, t, layer, labels, labelClass) {
 function drawAxisTitles(gd, layer, trace, t, xa, ya, labelOrientationA, labelOrientationB) {
     var a, b, xy, dxy;
 
-    var _a = trace.a.slice().sort(Lib.sorterAsc);
-    var _b = trace.b.slice().sort(Lib.sorterAsc);
+    var aMin = Lib.aggNums(Math.min, null, trace.a);
+    var aMax = Lib.aggNums(Math.max, null, trace.a);
+    var bMin = Lib.aggNums(Math.min, null, trace.b);
+    var bMax = Lib.aggNums(Math.max, null, trace.b);
 
-    a = 0.5 * (_a[0] + _a[_a.length - 1]);
-    b = _b[0];
+    a = 0.5 * (aMin + aMax);
+    b = bMin;
     xy = trace.ab2xy(a, b, true);
     dxy = trace.dxyda_rough(a, b);
     if(labelOrientationA.angle === undefined) {
         Lib.extendFlat(labelOrientationA, orientText(trace, xa, ya, xy, trace.dxydb_rough(a, b)));
     }
     drawAxisTitle(gd, layer, trace, t, xy, dxy, trace.aaxis, xa, ya, labelOrientationA, 'a-title');
 
-    a = _a[0];
-    b = 0.5 * (_b[0] + _b[_b.length - 1]);
+    a = aMin;
+    b = 0.5 * (bMin + bMax);
     xy = trace.ab2xy(a, b, true);
     dxy = trace.dxydb_rough(a, b);
     if(labelOrientationB.angle === undefined) {

src/traces/contour/plot.js

@@ -244,19 +244,20 @@ function makeLinesAndLabels(plotgroup, pathinfo, gd, cd0, contours) {
             .attr('data-notex', 1)
             .call(Drawing.font, contours.labelfont);
 
-        var _x = cd0.x.slice().sort(Lib.sorterAsc);
-        var _y = cd0.y.slice().sort(Lib.sorterAsc);
-
         var xa = pathinfo[0].xaxis;
         var ya = pathinfo[0].yaxis;
         var xLen = xa._length;
         var yLen = ya._length;
         var xRng = xa.range;
         var yRng = ya.range;
-        var x0 = Math.max(xa.c2p(_x[0], true), 0);
-        var x1 = Math.min(xa.c2p(_x[_x.length - 1], true), xLen);
-        var y0 = Math.max(ya.c2p(_y[_y.length - 1], true), 0);
-        var y1 = Math.min(ya.c2p(_y[0], true), yLen);
+        var xMin = Lib.aggNums(Math.min, null, cd0.x);
+        var xMax = Lib.aggNums(Math.max, null, cd0.x);
+        var yMin = Lib.aggNums(Math.min, null, cd0.y);
+        var yMax = Lib.aggNums(Math.max, null, cd0.y);
+        var x0 = Math.max(xa.c2p(xMin, true), 0);
+        var x1 = Math.min(xa.c2p(xMax, true), xLen);
+        var y0 = Math.max(ya.c2p(yMax, true), 0);
+        var y1 = Math.min(ya.c2p(yMin, true), yLen);
 
         // visible bounds of the contour trace (and the midpoints, to
         // help with cost calculations)