From 9f5564508ffc2210478b18316288dbd201e16ab1 Mon Sep 17 00:00:00 2001
From: Ian B <porjo38@yahoo.com.au>
Date: Sat, 23 Feb 2013 12:34:43 +0100
Subject: [PATCH] Add rotate shape operation (addresses #838)

---
 index.html                  |  3 ++
 js/id/actions/rotate_way.js | 39 +++++++++++++++++++
 js/id/modes/rotate_way.js   | 74 +++++++++++++++++++++++++++++++++++++
 js/id/operations/rotate.js  | 24 ++++++++++++
 locale/en.js                |  9 +++++
 5 files changed, 149 insertions(+)
 create mode 100644 js/id/actions/rotate_way.js
 create mode 100644 js/id/modes/rotate_way.js
 create mode 100644 js/id/operations/rotate.js

diff --git a/index.html b/index.html
index 9c633bc18..6701f2b82 100644
--- a/index.html
+++ b/index.html
@@ -108,6 +108,7 @@
         <script src='js/id/actions/merge.js'></script>
         <script src='js/id/actions/move_node.js'></script>
         <script src='js/id/actions/move_way.js'></script>
+        <script src='js/id/actions/rotate_way.js'></script>
         <script src='js/id/actions/circularize.js'></script>
         <script src='js/id/actions/orthogonalize.js'></script>
         <script src='js/id/actions/noop.js'></script>
@@ -133,6 +134,7 @@
         <script src='js/id/modes/draw_area.js'></script>
         <script src='js/id/modes/draw_line.js'></script>
         <script src='js/id/modes/move.js'></script>
+        <script src='js/id/modes/rotate_way.js'></script>
         <script src='js/id/modes/select.js'></script>
 
         <script src='js/id/operations.js'></script>
@@ -142,6 +144,7 @@
         <script src='js/id/operations/disconnect.js'></script>
         <script src='js/id/operations/merge.js'></script>
         <script src='js/id/operations/move.js'></script>
+        <script src='js/id/operations/rotate.js'></script>
         <script src='js/id/operations/reverse.js'></script>
         <script src='js/id/operations/split.js'></script>
 
diff --git a/js/id/actions/rotate_way.js b/js/id/actions/rotate_way.js
new file mode 100644
index 000000000..9de319780
--- /dev/null
+++ b/js/id/actions/rotate_way.js
@@ -0,0 +1,39 @@
+iD.actions.RotateWay = function(wayId, ref_points, pivot, mousePoint, projection) {
+    return function(graph) {
+        return graph.update(function(graph) {
+            var way = graph.entity(wayId),
+                nodes = _.uniq(graph.childNodes(way)),
+                angle, i, points;
+
+            points = deepCopy(ref_points);
+
+            angle = Math.atan2(mousePoint[1] - pivot[1], mousePoint[0] - pivot[0]);
+
+            for (i = 0; i < points.length; i++) {
+                var radial = [0,0];
+
+                radial[0] = points[i][0] - pivot[0];
+                radial[1] = points[i][1] - pivot[1];
+
+                points[i][0] = radial[0] * Math.cos(angle) - radial[1] * Math.sin(angle) + pivot[0];
+                points[i][1] = radial[0] * Math.sin(angle) + radial[1] * Math.cos(angle) + pivot[1];
+
+            }
+
+            for (i = 0; i < points.length; i++) {
+                graph = graph.replace(graph.entity(nodes[i].id).move(projection.invert(points[i])));
+            }
+
+            function deepCopy(o) {
+                var copy = o,k;
+                if (o && typeof o === 'object') {
+                    copy = Object.prototype.toString.call(o) === '[object Array]' ? [] : {};
+                    for (k in o) {
+                        copy[k] = deepCopy(o[k]);
+                    }
+                }
+                return copy;
+            }
+        });
+    };
+};
diff --git a/js/id/modes/rotate_way.js b/js/id/modes/rotate_way.js
new file mode 100644
index 000000000..c7b0e4a83
--- /dev/null
+++ b/js/id/modes/rotate_way.js
@@ -0,0 +1,74 @@
+iD.modes.RotateWay = function(context, wayId) {
+    var mode = {
+        id: 'rotate-way',
+        button: 'browse'
+    };
+
+    var keybinding = d3.keybinding('rotate-way');
+
+    mode.enter = function() {
+
+        var annotation = t('operations.rotate.annotation.' + context.geometry(wayId)),
+            way = context.graph().entity(wayId),
+            nodes = _.uniq(context.graph().childNodes(way)),
+            ref_points = nodes.map(function(n) { return context.projection(n.loc); }),
+            pivot = d3.geom.polygon(ref_points).centroid();
+
+        context.perform(
+            iD.actions.Noop(),
+            annotation);
+
+        function point() {
+            return d3.mouse(context.map().surface.node());
+        }
+
+        function rotate() {
+            var mousePoint = point();
+
+            context.replace(
+                iD.actions.RotateWay(wayId, ref_points, pivot, mousePoint, context.projection),
+                annotation);
+        }
+
+        function finish() {
+            d3.event.stopPropagation();
+            context.enter(iD.modes.Select(context, [wayId], true));
+        }
+
+        function cancel() {
+            context.pop();
+            context.enter(iD.modes.Select(context, [wayId], true));
+        }
+
+        function undone() {
+            context.enter(iD.modes.Browse(context));
+        }
+
+        context.surface()
+            .on('mousemove.rotate-way', rotate)
+            .on('click.rotate-way', finish);
+
+        context.history()
+            .on('undone.rotate-way', undone);
+
+        keybinding
+            .on('⎋', cancel)
+            .on('↩', finish);
+
+        d3.select(document)
+            .call(keybinding);
+    };
+
+    mode.exit = function() {
+        context.surface()
+            .on('mousemove.rotate-way', null)
+            .on('click.rotate-way', null);
+
+        context.history()
+            .on('undone.rotate-way', null);
+
+        keybinding.off();
+    };
+
+    return mode;
+};
diff --git a/js/id/operations/rotate.js b/js/id/operations/rotate.js
new file mode 100644
index 000000000..75a18770a
--- /dev/null
+++ b/js/id/operations/rotate.js
@@ -0,0 +1,24 @@
+iD.operations.Rotate = function(selection, context) {
+    var entityId = selection[0];
+
+    var operation = function() {
+        context.enter(iD.modes.RotateWay(context, entityId));
+    };
+
+    operation.available = function() {
+        return selection.length === 1 &&
+            context.entity(entityId).type === 'way' &&
+            context.entity(entityId).isClosed();
+    };
+
+    operation.enabled = function() {
+        return true;
+    };
+
+    operation.id = "rotate";
+    operation.key = t('operations.rotate.key');
+    operation.title = t('operations.rotate.title');
+    operation.description = t('operations.rotate.description');
+
+    return operation;
+};
diff --git a/locale/en.js b/locale/en.js
index 17b58275e..943ea9af4 100644
--- a/locale/en.js
+++ b/locale/en.js
@@ -115,6 +115,15 @@ locale.en = {
                 multiple: "Moved multiple objects"
             }
         },
+        rotate: {
+            title: "Rotate",
+            description: "Rotate this object around its centre point.",
+            key: "R",
+            annotation: {
+                line: "Rotated a line.",
+                area: "Rotated an area."
+            }
+        },
         reverse: {
             title: "Reverse",
             description: "Make this line go in the opposite direction.",