fix Build error

src/canvas.js

@@ -1,3 +1,4 @@
+import Unitary from './unitary.js';
 const __imageCaches = [];
 const errorCatcher = e => {
     console.log(e);

src/main.js

@@ -1,72 +1,3 @@
-"use strict";
+import Unitary from './unitary.js';
 import Canvas from './canvas.js';
-
-import UnitaryObject from './classes/unitaryobject.js';
-import ContouredObject from './classes/contouredobject.js';
-
-import BezierCurve from './classes/beziercurve.js';
-import Circle from './classes/circle.js';
-import CircularSector from './classes/circularsector.js';
-import Curve from './classes/curve.js';
-import Doughnut from './classes/doughnut.js';
-import Ellipse from './classes/ellipse.js';
-import Graph from './classes/graph.js';
-import Group from './classes/group.js';
-import Image_ from './classes/image.js';
-import Line from './classes/line.js';
-import Point from './classes/point.js';
-import Polygon from './classes/polygon.js';
-import Quadrilateral from './classes/quadrilateral.js';
-import Rect from './classes/rect.js';
-import Segment from './classes/segment.js';
-import Text_ from './classes/text.js';
-import Triangle from './classes/triangle.js';
-import {BaseVector, Vector, Vector3D} from './classes/vector.js';
-import {version as VERSION} from '../package.json';
-
-export default {
-    distance: (A, B) => {
-        let res;
-        if (A instanceof Point && B instanceof Point) {
-            return Math.sqrt((A.x - B.x) * (A.x - B.x) + (A.y - B.y) * (A.y - B.y));
-        }
-        if (A instanceof Point && B instanceof Line) {
-            res = B.a * A.x + B.b * A.y + B.c;
-            if (res < 0) {
-                res *= -1;
-            }
-            res /= Math.sqrt(B.a * B.a + B.b * B.b);
-            return res;
-        }
-        if (A instanceof Line && B instanceof Point) {
-            return distance(B, A);
-        }
-    },
-    Canvas,
-    UnitaryObject,
-    ContouredObject,
-    BaseVector,
-    BezierCurve,
-    Circle,
-    CircularSector,
-    Curve,
-    Doughnut,
-    Donut: Doughnut,
-    Ellipse,
-    Graph,
-    Group,
-    Image: Image_,
-    Line,
-    Point,
-    Polygon,
-    Quadrilateral,
-    Rect,
-    Segment,
-    Text: Text_,
-    Triangle,
-    Vector3D,
-    Vector,
-    XAxis: new Line(new Point(0, 0), new Point(1, 0)),
-    YAxis: new Line(new Point(0, 0), new Point(0, 1)),
-    VERSION
-};
+export default Object.assign({}, Unitary, {Canvas});

src/painter/beziercurve.js

@@ -1,3 +1,4 @@
+import Unitary from '../unitary.js';
 export default function(obj) {
     this.canvas.beginPath();
     const controlPoints = obj.controlPoints;

src/painter/curve.js

@@ -1,3 +1,4 @@
+import Unitary from '../unitary.js';
 export default function(obj) {
     this.canvas.beginPath();
     const {start, end, x, y} = obj;

src/painter/graph.js

@@ -1,3 +1,4 @@
+import Unitary from '../unitary.js';
 export default function(obj) {
     this.canvas.beginPath();
     let start = obj.start , end = obj.end;

src/painter/line.js

@@ -1,3 +1,4 @@
+import Unitary from '../unitary.js';
 export default function(obj) {
     const S = Unitary.Segment, P = Unitary.Point;
     const width = this.canvasWidth, height = this.canvasHeight;

src/unitary.js

@@ -0,0 +1,69 @@
+"use strict";
+import UnitaryObject from './classes/unitaryobject.js';
+import ContouredObject from './classes/contouredobject.js';
+
+import BezierCurve from './classes/beziercurve.js';
+import Circle from './classes/circle.js';
+import CircularSector from './classes/circularsector.js';
+import Curve from './classes/curve.js';
+import Doughnut from './classes/doughnut.js';
+import Ellipse from './classes/ellipse.js';
+import Graph from './classes/graph.js';
+import Group from './classes/group.js';
+import Image_ from './classes/image.js';
+import Line from './classes/line.js';
+import Point from './classes/point.js';
+import Polygon from './classes/polygon.js';
+import Quadrilateral from './classes/quadrilateral.js';
+import Rect from './classes/rect.js';
+import Segment from './classes/segment.js';
+import Text_ from './classes/text.js';
+import Triangle from './classes/triangle.js';
+import {BaseVector, Vector, Vector3D} from './classes/vector.js';
+import {version as VERSION} from '../package.json';
+
+export default {
+    distance: (A, B) => {
+        let res;
+        if (A instanceof Point && B instanceof Point) {
+            return Math.sqrt((A.x - B.x) * (A.x - B.x) + (A.y - B.y) * (A.y - B.y));
+        }
+        if (A instanceof Point && B instanceof Line) {
+            res = B.a * A.x + B.b * A.y + B.c;
+            if (res < 0) {
+                res *= -1;
+            }
+            res /= Math.sqrt(B.a * B.a + B.b * B.b);
+            return res;
+        }
+        if (A instanceof Line && B instanceof Point) {
+            return distance(B, A);
+        }
+    },
+    UnitaryObject,
+    ContouredObject,
+    BaseVector,
+    BezierCurve,
+    Circle,
+    CircularSector,
+    Curve,
+    Doughnut,
+    Donut: Doughnut,
+    Ellipse,
+    Graph,
+    Group,
+    Image: Image_,
+    Line,
+    Point,
+    Polygon,
+    Quadrilateral,
+    Rect,
+    Segment,
+    Text: Text_,
+    Triangle,
+    Vector3D,
+    Vector,
+    XAxis: new Line(new Point(0, 0), new Point(1, 0)),
+    YAxis: new Line(new Point(0, 0), new Point(0, 1)),
+    VERSION
+};