From bf6df958cbba27e9b13e297b4562adad04395ccf Mon Sep 17 00:00:00 2001
From: Val Erastov <xibyte@gmail.com>
Date: Wed, 10 Feb 2016 23:31:03 -0800
Subject: [PATCH] Point in the middle

---
 web/app/sketcher/main2d.js     |  4 +++
 web/app/sketcher/parametric.js | 47 ++++++++++++++++++++++++++++++++++
 web/sketcher.html              |  1 +
 3 files changed, 52 insertions(+)

diff --git a/web/app/sketcher/main2d.js b/web/app/sketcher/main2d.js
index 5c1029e1..3b42823d 100644
--- a/web/app/sketcher/main2d.js
+++ b/web/app/sketcher/main2d.js
@@ -157,6 +157,10 @@ TCAD.App2D = function() {
     app.viewer.parametricManager.pointOnArc(app.viewer.selected);
   });
 
+  this.registerAction('pointInMiddle', "Point In the Middle", function () {
+    app.viewer.parametricManager.pointInMiddle(app.viewer.selected);
+  });
+
   this.registerAction('llAngle', "Angle Between 2 Lines", function () {
     app.viewer.parametricManager.llAngle(app.viewer.selected, prompt);
   });
diff --git a/web/app/sketcher/parametric.js b/web/app/sketcher/parametric.js
index a929c761..df98e42b 100644
--- a/web/app/sketcher/parametric.js
+++ b/web/app/sketcher/parametric.js
@@ -216,6 +216,11 @@ TCAD.TWO.ParametricManager.prototype.p2lDistance = function(objs, promptCallback
   }
 };
 
+TCAD.TWO.ParametricManager.prototype.pointInMiddle = function(objs) {
+  var pl = this._fetchPointAndLine(objs);
+  this.add(new TCAD.TWO.Constraints.PointInMiddle(pl[0], pl[1]));
+};
+
 TCAD.TWO.ParametricManager.prototype.pointOnArc = function(objs) {
   var points = this._fetch(objs, ['TCAD.TWO.EndPoint'], 1);
   var arcs = this._fetch(objs, ['TCAD.TWO.Arc', 'TCAD.TWO.Circle'], 1);
@@ -1169,6 +1174,48 @@ TCAD.TWO.Constraints.PointOnArc.prototype.getObjects = function() {
 
 // ------------------------------------------------------------------------------------------------------------------ //
 
+/** @constructor */
+TCAD.TWO.Constraints.PointInMiddle = function(point, line) {
+  this.point = point;
+  this.line = line;
+  this.length = new TCAD.TWO.Ref(TCAD.math.distanceAB(line.a, line.b) / 2);
+};
+
+TCAD.TWO.Constraints.PointInMiddle.prototype.NAME = 'PointInMiddle';
+TCAD.TWO.Constraints.PointInMiddle.prototype.UI_NAME = 'Point In the Middle';
+
+TCAD.TWO.Constraints.PointInMiddle.prototype.getSolveData = function() {
+  var params1 = [];
+  var params2 = [];
+  
+  this.line.a.collectParams(params1);
+  this.point.collectParams(params1);
+  params1.push(this.length);
+
+  this.line.b.collectParams(params2);
+  this.point.collectParams(params2);
+  params2.push(this.length);
+
+  return [
+    ['P2PDistanceV', params1, []],
+    ['P2PDistanceV', params2, []]
+  ];
+};
+
+TCAD.TWO.Constraints.PointInMiddle.prototype.serialize = function() {
+  return [this.NAME, [this.point.id, this.line.id]];
+};
+
+TCAD.TWO.Constraints.Factory[TCAD.TWO.Constraints.PointInMiddle.prototype.NAME] = function(refs, data) {
+  return new TCAD.TWO.Constraints.PointInMiddle(refs(data[0]), refs(data[1]));
+};
+
+TCAD.TWO.Constraints.PointInMiddle.prototype.getObjects = function() {
+  return [this.point, this.line];
+};
+
+// ------------------------------------------------------------------------------------------------------------------ //
+
 /** @constructor */
 TCAD.TWO.Constraints.Angle = function(p1, p2, p3, p4, angle) {
   this.p1 = p1;
diff --git a/web/sketcher.html b/web/sketcher.html
index d32f9ad7..e2c2bc76 100644
--- a/web/sketcher.html
+++ b/web/sketcher.html
@@ -94,6 +94,7 @@
       <button class="btn rbtn act-lockConstraint" ><i class="fa fa-lock"></i></button>
       <button class="btn rbtn act-pointOnLine" >PL</button>
       <button class="btn rbtn act-pointOnArc" >PA</button>
+      <button class="btn rbtn act-pointInMiddle" >MID</button>
       <button class="btn rbtn act-llAngle" >A</button>
     </div>
   </div>