Shapes

shapes.js is small program to calculate the area, perimeter, and number of sides of different geometrical shapes (e.g., triangles, circles).

Program

The program to evaluate is shown in the following

TShape = {
 b: 2,
 h: 3,
 type: "shape",
 getType: function() {
  return this.type;
 },
 area: function() {
  return 'Calling an abstract method area';
 },
 perimeter: function() {
  return 'Calling an abstract method perimeter';
 },
 numberOfSides: function() {
  return 0;
 }
};

Triangle = new cop.Context();
TriangleBehavior = cop.Trait({ 
 getType: function() {
  return "triangle";
 },
 area: function() {
  return this.b * this.h/2;
 },
 perimeter: function() {
  return this.b + 2*Math.sqrt(Math.pow(this.h,2) + Math.pow(this.b/2, 2));
 },
 numberOfSides: function() {
  return 3;
 }
}); 
Triangle.adapt(TShape, TriangleBehavior);



Circle = new cop.Context();
CircleBehavior = cop.Trait({ 
 getType: function() {
  return "circle";
 },
 area: function() {
  return Math.pow(this.b, 2) * Math.PI;
 },
 perimeter: function() {
  return this.b * 2* Math.PI;
 },
 numberOfSides: function() {
  throw new Error("Number of sides is not defined in a circle");
 }
}); 
Circle.adapt(TShape, CircleBehavior);

if(matchMedia.random() >= 0.5) 
 Circle.activate()
else 
 Triangle.activate();

var area = TShape.area();
var sides = TShape.numberOfSides();

if(Circle.isActive()) 
 this.Circle.deactivate();
else
 Triangle.deactivate();

Precision and Recall

Analysis for the area variable | Analysis | Instances | True Positives | False Positives | False Negatives | Precision | Recall | | —- | —- | —- | —- | —- | —- | —- | Baseline | 3 | 1 | 0 | 2 | 1 | 0.33 Whole Program | 3 | 1 | 0 | 2 | 1 | 0.33 Our | 3 | 3 | 0 | 0 | 1 | 1

Analysis for the sides variable | Analysis | Instances | True Positives | False Positives | False Negatives | Precision | Recall | | —- | —- | —- | —- | —- | —- | —- | Baseline | 3 | 1 | 0 | 2 | 1 | 0.33 Whole Program | 3 | 1 | 0 | 2 | 1 | 0.33 Our | 3 | 3 | 0 | 0 | 1 | 1

Performance

All times are shown in ms.

Analysis	No. of Nodes	No. of Edges	Processing time	Analysis time
Baseline	125	124	688 ± 10.7	391 ± 34.1
Whole Program	220	223	897 ± 28.6	567 ± 28
Our	131	130	791 ± 37.2	367 ± 17.4