make bezier curve shape pickable

web/app/sketcher/shapes/bezier-curve.js

@@ -1,6 +1,8 @@
 import {Ref} from './ref'
 import {SketchObject} from './sketch-object'
 import {Segment} from './segment'
+import {LUT} from '../../math/bezier-cubic'
+import * as draw_utils from '../shapes/draw-utils'
 
 import * as math from '../../math/math';
 
@@ -27,8 +29,17 @@ export class BezierCurve extends SketchObject {
     this.cp2.collectParams(params);
   }
 
-  normalDistance() {
-    return 1000000;
+  normalDistance(aim, scale) {
+    this.lut = LUT(this.a, this.b, this.cp1, this.cp2, scale);
+    const lut = this.lut;
+    let hero = -1;
+    for (let p = lut.length - 1, q = 0; q < lut.length; p = q ++) {
+      const dist = Math.min(Segment.calcNormalDistance(aim, lut[p], lut[q]));        
+      if (dist != -1) {
+        hero = hero == -1 ? dist : Math.min(dist, hero);
+      }
+    }
+    return hero;
   }
   
   drawImpl(ctx, scale, viewer) {
@@ -36,6 +47,13 @@ export class BezierCurve extends SketchObject {
     ctx.moveTo(this.a.x, this.a.y);
     ctx.bezierCurveTo(this.cp1.x, this.cp1.y, this.cp2.x, this.cp2.y, this.b.x, this.b.y);
     ctx.stroke();
+    
+    //debug lut
+    if (this.lut) {
+      for (let p of this.lut) {
+        draw_utils.DrawPoint(ctx, p.x, p.y, 3, scale);
+      }
+    }
   }
 }
 BezierCurve.prototype._class = 'TCAD.TWO.BezierCurve';

web/app/sketcher/shapes/point.js

@@ -49,6 +49,10 @@ export class EndPoint extends SketchObject {
     this.setXY(arr[0], arr[1]);
   }
   
+  toVector() {
+    return new Vector(this.x, this.y);
+  }
+  
   copy() {
     return new EndPoint(this.x, this.y);
   }

web/app/sketcher/shapes/segment.js

@@ -29,16 +29,17 @@ export class Segment extends SketchObject {
     this.a.collectParams(params);
     this.b.collectParams(params);
   }
-  
+
   normalDistance(aim) {
-    var x = aim.x;
-    var y = aim.y;
-  
-    var ab = new Vector(this.b.x - this.a.x, this.b.y - this.a.y)
-    var e = ab.normalize();
-    var a = new Vector(aim.x - this.a.x, aim.y - this.a.y);
-    var b = e.multiply(a.dot(e));
-    var n = a.minus(b);
+    return Segment.calcNormalDistance(aim, this.a, this.b);
+  }
+
+  static calcNormalDistance(aim, segmentA, segmentB) {
+    const ab = new Vector(segmentB.x - segmentA.x, segmentB.y - segmentA.y)
+    const e = ab.normalize();
+    const a = new Vector(aim.x - segmentA.x, aim.y - segmentA.y);
+    const b = e.multiply(a.dot(e));
+    const n = a.minus(b);
   
     //Check if vector b lays on the vector ab
     if (b.length() > ab.length()) {

web/app/sketcher/shapes/sketch-object.js

@@ -12,6 +12,10 @@ export class SketchObject extends Shape {
     this.layer = null;
   }
 
+  normalDistance(aim, scale) {
+    return -1;
+  }
+  
   addChild(child) {
     this.children.push(child);
     child.parent = this;

web/app/sketcher/viewer2d.js

@@ -134,12 +134,12 @@ Viewer.prototype.search = function(x, y, buffer, deep, onlyPoints, filter) {
     for (var j = 0; j < objs.length; j++) {
       var l = unreachable + 1;
       var before = pickResult.length;
-      objs[j].accept(function(o) {
+      objs[j].accept((o) => {
         if (!o.visible) return true;
         if (onlyPoints && !isEndPoint(o)) {
           return true;  
         }
-        l = o.normalDistance(aim);
+        l = o.normalDistance(aim, this.scale);
         if (l >= 0 && l <= buffer && !isFiltered(o)) {
           pickResult.push(o);
           return false;