Fix 7717 - flipped axis orientation bug

src/plots/cartesian/set_convert.js

@@ -445,23 +445,25 @@ module.exports = function setConvert(ax, fullLayout) {
 
         var bounds = Lib.simpleMap([minallowed, maxallowed], ax.r2l);
 
-        if(minallowed !== undefined && rng[0] < bounds[0]) range[axrev ? 1 : 0] = minallowed;
-        if(maxallowed !== undefined && rng[1] > bounds[1]) range[axrev ? 0 : 1] = maxallowed;
-
-        if(range[0] === range[1]) {
-            var minL = ax.l2r(minallowed);
-            var maxL = ax.l2r(maxallowed);
+        if(minallowed !== undefined && rng[0] < bounds[0]) {
+            range[axrev ? 1 : 0] = minallowed;
+            rng[0] = bounds[0];
+        }
+        if(maxallowed !== undefined && rng[1] > bounds[1]) {
+            range[axrev ? 0 : 1] = maxallowed;
+            rng[1] = bounds[1];
+        }
 
+        // If clamping collapsed or inverted the range, extend the opposite end
+        // so we preserve the original orientation. Otherwise a default range
+        // entirely below minallowed (or above maxallowed) would flip the axis.
+        if(rng[0] >= rng[1]) {
             if(minallowed !== undefined) {
-                var _max = minL + 1;
-                if(maxallowed !== undefined) _max = Math.min(_max, maxL);
-                range[axrev ? 1 : 0] = _max;
-            }
-
-            if(maxallowed !== undefined) {
-                var _min = maxL + 1;
-                if(minallowed !== undefined) _min = Math.max(_min, minL);
-                range[axrev ? 0 : 1] = _min;
+                var _max = bounds[0] + 1;
+                if(maxallowed !== undefined) _max = Math.min(_max, bounds[1]);
+                range[axrev ? 0 : 1] = ax.l2r(_max);
+            } else if(maxallowed !== undefined) {
+                range[axrev ? 1 : 0] = ax.l2r(bounds[1] - 1);
             }
         }
     };

test/jasmine/tests/axes_test.js

@@ -1733,6 +1733,65 @@ describe('Test axes', function() {
         });
     });
 
+    describe('minallowed / maxallowed', function() {
+        // regression test for https://github.com/plotly/plotly.js/issues/7717
+        var gd;
+
+        beforeEach(function() { gd = createGraphDiv(); });
+        afterEach(destroyGraphDiv);
+
+        function expectForward(done, minallowed) {
+            Plotly.newPlot(gd, [{
+                x: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
+                y: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+            }], {
+                xaxis: { minallowed: minallowed }
+            }).then(function() {
+                var r = gd._fullLayout.xaxis.range;
+                expect(r[0]).toBeLessThan(r[1], 'axis should not be reversed for minallowed=' + minallowed);
+                expect(r[0]).toBe(minallowed, 'axis min should be pinned at minallowed');
+            }).then(done, done.fail);
+        }
+
+        it('does not reverse axis when minallowed exceeds default range max', function(done) {
+            expectForward(done, 7);
+        });
+
+        it('does not reverse axis when minallowed equals default range max', function(done) {
+            expectForward(done, 6);
+        });
+
+        it('does not reverse axis when minallowed is well above default range max', function(done) {
+            expectForward(done, 100);
+        });
+
+        it('keeps explicit autorange:reversed even when minallowed is set', function(done) {
+            Plotly.newPlot(gd, [{
+                x: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
+                y: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+            }], {
+                xaxis: { autorange: 'reversed', minallowed: 7 }
+            }).then(function() {
+                var r = gd._fullLayout.xaxis.range;
+                expect(r[0]).toBeGreaterThan(r[1], 'axis should remain reversed');
+                expect(r[1]).toBe(7, 'min slot (range[1] when reversed) should be minallowed');
+            }).then(done, done.fail);
+        });
+
+        it('does not reverse axis when maxallowed is below default range min', function(done) {
+            Plotly.newPlot(gd, [{
+                x: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
+                y: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+            }], {
+                xaxis: { maxallowed: -2 }
+            }).then(function() {
+                var r = gd._fullLayout.xaxis.range;
+                expect(r[0]).toBeLessThan(r[1], 'axis should not be reversed');
+                expect(r[1]).toBe(-2, 'axis max should be pinned at maxallowed');
+            }).then(done, done.fail);
+        });
+    });
+
     describe('constraints relayout', function() {
         var gd;