From f0b761b97923cf4dc3100443ce03a64b24f66c83 Mon Sep 17 00:00:00 2001
From: Tom MacWright <tom@macwright.org>
Date: Thu, 7 Feb 2013 16:21:25 -0500
Subject: [PATCH] Lasso action

---
 css/app.css             | 11 ++++---
 index.html              |  2 ++
 js/id/behavior/lasso.js | 57 +++++++++++++++++++++++++++++++++++++
 js/id/modes/browse.js   |  1 +
 js/id/ui/lasso.js       | 63 +++++++++++++++++++++++++++++++++++++++++
 5 files changed, 130 insertions(+), 4 deletions(-)
 create mode 100644 js/id/behavior/lasso.js
 create mode 100644 js/id/ui/lasso.js

diff --git a/css/app.css b/css/app.css
index 65f98dfd6..99904d953 100644
--- a/css/app.css
+++ b/css/app.css
@@ -1398,6 +1398,13 @@ a.success-action {
             border-radius: 4px;
 }
 
+.lasso-box {
+    fill-opacity:0.2;
+    fill: #bde5aa;
+    stroke: #000;
+    stroke-width: 1;
+}
+
 /* Media Queries
 ------------------------------------------------------- */
 
@@ -1408,10 +1415,6 @@ a.success-action {
     .save .label, .apply .label, .cancel .label { display: block;}
 }
 
-
-
-
-
 div.combobox {
     width:155px;
     z-index: 9999;
diff --git a/index.html b/index.html
index 9f4c23757..31f06870a 100644
--- a/index.html
+++ b/index.html
@@ -75,6 +75,7 @@
         <script src='js/id/ui/restore.js'></script>
         <script src='js/id/ui/tag_reference.js'></script>
         <script src='js/id/ui/key_reference.js'></script>
+        <script src='js/id/ui/lasso.js'></script>
 
         <script src='js/id/actions.js'></script>
         <script src="js/id/actions/add_midpoint.js"></script>
@@ -102,6 +103,7 @@
         <script src='js/id/behavior/drag.js'></script>
         <script src='js/id/behavior/drag_node.js'></script>
         <script src='js/id/behavior/draw.js'></script>
+        <script src='js/id/behavior/lasso.js'></script>
         <script src='js/id/behavior/draw_way.js'></script>
         <script src='js/id/behavior/hash.js'></script>
         <script src='js/id/behavior/hover.js'></script>
diff --git a/js/id/behavior/lasso.js b/js/id/behavior/lasso.js
new file mode 100644
index 000000000..08dda8cd3
--- /dev/null
+++ b/js/id/behavior/lasso.js
@@ -0,0 +1,57 @@
+iD.behavior.Lasso = function(context) {
+
+    var behavior = function(selection) {
+
+        var timeout = null,
+            // the position of the first mousedown
+            pos = null,
+            lasso;
+
+        function mousedown() {
+            if (d3.event.shiftKey === true) {
+
+                lasso = iD.ui.lasso().a(d3.mouse(context.surface().node()));
+
+                context.surface().call(lasso);
+
+                selection
+                    .on('mousemove.lasso', mousemove)
+                    .on('mouseup.lasso', mouseup);
+
+                d3.event.stopPropagation();
+                d3.event.preventDefault();
+
+            }
+        }
+
+        function mousemove() {
+            lasso.b(d3.mouse(context.surface().node()));
+        }
+
+        function mouseup() {
+            var extent = iD.geo.Extent(
+                context.projection.invert(lasso.a()),
+                context.projection.invert(lasso.b()));
+
+            lasso.close();
+
+            var selected = context.graph().intersects(extent);
+
+            if (selected.length) {
+                context.enter(iD.modes.Select(context, _.pluck(selected, 'id')));
+            }
+
+            selection
+                .on('mousemove.lasso', null);
+        }
+
+        selection
+            .on('mousedown.select', mousedown);
+    };
+
+    behavior.off = function(selection) {
+        selection.on('mousedown.lasso', null);
+    };
+
+    return behavior;
+};
diff --git a/js/id/modes/browse.js b/js/id/modes/browse.js
index 97f0d6935..5df94d69d 100644
--- a/js/id/modes/browse.js
+++ b/js/id/modes/browse.js
@@ -10,6 +10,7 @@ iD.modes.Browse = function(context) {
     var behaviors = [
         iD.behavior.Hover(),
         iD.behavior.Select(context),
+        iD.behavior.Lasso(context),
         iD.behavior.DragNode(context)];
 
     mode.enter = function() {
diff --git a/js/id/ui/lasso.js b/js/id/ui/lasso.js
new file mode 100644
index 000000000..1ca079fda
--- /dev/null
+++ b/js/id/ui/lasso.js
@@ -0,0 +1,63 @@
+iD.ui.lasso = function() {
+
+    var center, box,
+        group,
+        a = [0, 0],
+        b = [0, 0];
+
+    function lasso(selection) {
+
+        group = selection.append('g')
+            .attr('class', 'lasso')
+            .attr('opacity', 0);
+
+        box = group.append('rect')
+            .attr('class', 'lasso-box');
+
+        group.transition()
+            .style('opacity', 1);
+
+    }
+
+    // top-left
+    function topLeft(d) {
+        return 'translate(' +
+            [Math.min(d[0][0], d[1][0]), Math.min(d[0][1], d[1][1])] + ')';
+    }
+
+    function width(d) { return Math.abs(d[0][0] - d[1][0]); }
+    function height(d) { return Math.abs(d[0][1] - d[1][1]); }
+
+    function draw() {
+        if (box) {
+            box.data([[a, b]])
+                .attr('transform', topLeft)
+                .attr('width', width)
+                .attr('height', height);
+        }
+    }
+
+    lasso.a = function(_) {
+        if (!arguments.length) return a;
+        a = _;
+        draw();
+        return lasso;
+    };
+
+    lasso.b = function(_) {
+        if (!arguments.length) return b;
+        b = _;
+        draw();
+        return lasso;
+    };
+
+    lasso.close = function(selection) {
+        if (group) {
+            group.transition()
+                .attr('opacity', 0)
+                .remove();
+        }
+    };
+
+    return lasso;
+};