diff --git a/README.md b/README.md
index f3ae006..ebd0357 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,11 @@
 
 Computational Geometry and Rendering library for JavaScript
 
-**version: 0.9.9** (73 kB minified)
+**version: 0.9.8** (72 kB minified)
+
+
+[API Reference](/manual.md)
+
 
 Examples:
 
@@ -23,24 +27,34 @@ Examples:
 [See it](https://foo123.github.io/examples/geometrize/)
 
 ```javascript
-const {Plane, Ellipse, Circle, Arc, QBezier, CBezier, Line, Point} = Geometrize;
+const {Plane, CompositeCurve, ParametricCurve, Ellipse, Circle, Arc, QBezier, CBezier, Line, Polyline, Polygon, Rect, Matrix} = Geometrize;
 const plane = Plane(document.getElementById('container'), 0, 0, 300, 300);
+const spiral = ParametricCurve((t) => ({x:190 + t*50*Math.cos(t*6*Math.PI), y:80 + t*50*Math.sin(t*6*Math.PI)}));
 const ellipse = Ellipse([40,40], 30, 10, -45);
 const circle = Circle([30,30], 20);
 const arc = Arc([100,100], [170,90], 30, 10, 30, 0, 1);
 const qbezier = QBezier([[80,110], [120,40], [160,120]]);
 const cbezier = CBezier([[40,80], [120,40], [140,200], [160,90]]);
+const curve = CompositeCurve([
+    Line([20,100], [40,100]),
+    Arc([40,100], [40,80], 10, 10, 0, 0, 0),
+    QBezier([[40,80],[20,100],[60,120]]),
+    Line([60,120], [70,100])
+]).transform(Matrix.translate(-20, 0));
 const line1 = Line([20,20], [60,60]).setStyle('stroke', 'blue');
 const line2 = Line([50,2], [20,70]).setStyle('stroke', 'green');
 const line3 = Line([60,160], [300,0]).setStyle('stroke', 'orange');
 const line4 = Line([60,120], [300,-40]).setStyle('stroke', 'cyan');
+
 let intersections = [];
 
+plane.add(spiral);
 plane.add(ellipse);
 plane.add(circle);
 plane.add(arc);
 plane.add(qbezier);
 plane.add(cbezier);
+plane.add(curve);
 plane.add(line1);
 plane.add(line2);
 plane.add(line3);
diff --git a/beeld.config b/beeld.config
index 6c23eec..5c77e8e 100644
--- a/beeld.config
+++ b/beeld.config
@@ -48,18 +48,16 @@ tasks =[{}]
         header = ./src/header.js
 
         replace =[{}]
-            "@@VERSION@@" = "0.9.9"
+            "@@VERSION@@" = "0.9.8"
             "@@DATE@@" = Xpresion::date("Y-m-d H:i:s")
         @
 
-        # Extract documentation from the source (map)
+        # extract documentation
         doc ={}
-
-            "startdoc" = "/**[DOC_MARKDOWN]"
-            "enddoc" = "[/DOC_MARKDOWN]**/"
-            "trim" = RegExp::^\\s*\\*[ ]?
+            "startdoc" = "/**[DOC_MD]"
+            "enddoc" = "[/DOC_MD]**/"
+            "trim" = RegExp::^\s*\*[ ]?
             "output" = "./manual.md"
-
         @
 
         out = ./build/Geometrize.js
diff --git a/boundingboxes.png b/boundingboxes.png
index 43f5cbf..77ab904 100644
Binary files a/boundingboxes.png and b/boundingboxes.png differ
diff --git a/build/Geometrize.js b/build/Geometrize.js
index 99c8ed3..95aff17 100644
--- a/build/Geometrize.js
+++ b/build/Geometrize.js
@@ -2,14 +2,14 @@
 *   Geometrize
 *   computational geometry and rendering library for JavaScript
 *
-*   @version 0.9.9 (2023-01-03 18:38:02)
+*   @version 0.9.8 (2023-01-04 10:07:44)
 *   https://github.com/foo123/Geometrize
 *
 **//**
 *   Geometrize
 *   computational geometry and rendering library for JavaScript
 *
-*   @version 0.9.9 (2023-01-03 18:38:02)
+*   @version 0.9.8 (2023-01-04 10:07:44)
 *   https://github.com/foo123/Geometrize
 *
 **/
@@ -40,7 +40,7 @@ var HAS = Object.prototype.hasOwnProperty,
     isNode = ("undefined" !== typeof global) && ("[object global]" === toString.call(global)),
     isBrowser = ("undefined" !== typeof window) && ("[object Window]" === toString.call(window)),
     root = isNode ? global : (isBrowser ? window : this),
-    Geometrize = {VERSION: "0.9.9", Math: {}, Geometry: {}}
+    Geometrize = {VERSION: "0.9.8", Math: {}, Geometry: {}}
 ;
 
 // basic backwards-compatible "class" construction
@@ -175,7 +175,17 @@ var Value = makeClass(null, merge(null, {
     val: null,
     valueOf: null,
     toString: null
-}, Changeable));// 2D Homogeneous Transformation Matrix class
+}, Changeable));/**[DOC_MD]
+ * ### 2D Homogeneous Transformation Matrix
+ *
+ * Represents a homogeneous transformation matrix for 2D transforms
+ *
+ * ```javascript
+ * const m = Matrix.translate(tx, ty).mul(Matrix.rotate(theta).mul(Matrix.scale(sx, sy)));
+ * // p is a point, p2 is a transformed point
+ * const p2 = m.transform(p);
+ * ```
+[/DOC_MD]**/
 var Matrix = makeClass(null, {
     constructor: function Matrix(
         m00, m01, m02,
@@ -256,12 +266,12 @@ var Matrix = makeClass(null, {
         if (other instanceof Matrix)
         {
             return new Matrix(
-                self.$00*other.$00 + self.$01*other.$10 + self.$02*other.$20,
-                self.$00*other.$01 + self.$01*other.$11 + self.$02*other.$21,
-                self.$00*other.$02 + self.$01*other.$12 + self.$02*other.$22,
-                self.$10*other.$00 + self.$11*other.$10 + self.$12*other.$20,
-                self.$10*other.$01 + self.$11*other.$11 + self.$12*other.$21,
-                self.$10*other.$02 + self.$11*other.$12 + self.$12*other.$22
+                self.$00*other.$00 + self.$01*other.$10,
+                self.$00*other.$01 + self.$01*other.$11,
+                self.$00*other.$02 + self.$01*other.$12 + self.$02,
+                self.$10*other.$00 + self.$11*other.$10,
+                self.$10*other.$01 + self.$11*other.$11,
+                self.$10*other.$02 + self.$11*other.$12 + self.$12
             );
         }
         else
@@ -275,13 +285,12 @@ var Matrix = makeClass(null, {
     },
     det: function() {
         var self = this;
-        return self.$00*(self.$11*self.$22 - self.$12*self.$21) + self.$01*(self.$12*self.$20 - self.$10*self.$22) + self.$02*(self.$21*self.$10 - self.$11*self.$20);
+        return self.$00*(self.$11*/*self.$22*/1 - self.$12*/*self.$21*/0) + self.$01*(self.$12*/*self.$20*/0 - self.$10*/*self.$22*/1) + self.$02*(0/*self.$21*/*self.$10 - self.$11*/*self.$20*/0);
     },
     inv: function() {
         var self = this,
             a00 = self.$00, a01 = self.$01, a02 = self.$02,
             a10 = self.$10, a11 = self.$11, a12 = self.$12,
-            //a20 = self.$20, a21 = self.$21, a22 = self.$22,
             det2 = a00*a11 - a01*a10,
             i00 = 0, i01 = 0, i10 = 0, i11 = 0;
 
@@ -675,7 +684,15 @@ var Primitive = makeClass(null, merge(null, {
     }
 }, Changeable));
 Geometrize.Primitive = Primitive;
-// 2D Point class
+/**[DOC_MD]
+ * ### 2D Point
+ *
+ * Represents a point in 2D space
+ * 
+ * ```javascript
+ * const p = Point(x, y);
+ * ```
+[/DOC_MD]**/
 var Point = makeClass(Primitive, {
     constructor: function Point(x, y) {
         var self = this, _x = 0, _y = 0, _n = null;
@@ -886,7 +903,14 @@ var Point = makeClass(Primitive, {
     }
 });
 Geometrize.Point = Point;
-// 2D geometric Topos ie set of points
+/**[DOC_MD]
+ * ### 2D Topos
+ *
+ * Represents a geometric topos, ie a set of points
+ * ```javascript
+ * const topos = Topos([p1, p2, p3, .., pn]);
+ * ```
+[/DOC_MD]**/
 var Topos = makeClass(Primitive, {
     constructor: function Topos(points) {
         var self = this,
@@ -1046,7 +1070,13 @@ var Topos = makeClass(Primitive, {
     }
 });
 Geometrize.Topos = Topos;
-// 2D generic Curve base class
+/**[DOC_MD]
+ * ### 2D Generic Curve Base Class
+ *
+ * Represents a generic curve in 2D space
+ * (not used directly)
+ *
+[/DOC_MD]**/
 var Curve = makeClass(Topos, {
     constructor: function Curve(points, values) {
         var self = this,
@@ -1288,7 +1318,13 @@ var Curve = makeClass(Topos, {
 });
 Geometrize.Curve = Curve;
 
-// 2D generic Bezier curve base class
+/**[DOC_MD]
+ * ### 2D Generic Bezier Curve Base Class
+ *
+ * Represents a generic bezier curve in 2D space
+ * (not used directly)
+ *
+[/DOC_MD]**/
 var Bezier = makeClass(Curve, {
     constructor: function Bezier(points, values) {
         var self = this;
@@ -1344,7 +1380,15 @@ var Bezier = makeClass(Curve, {
 });
 Geometrize.Bezier = Bezier;
 
-// 2D generix Parametric Curve class (defined by parametric function f)
+/**[DOC_MD]
+ * ### 2D Generic Parametric Curve
+ *
+ * Represents a generic parametric curve in 2D space
+ * ```javascript
+ * // construct a spiral (0 <= t <= 1)
+ * const spiral = ParametricCurve((t) => ({x: cx + t*r*Math.cos(t*6*Math.PI), y: cy + t*r*Math.sin(t*6*Math.PI)}));
+ * ```
+[/DOC_MD]**/
 var ParametricCurve = makeClass(Curve, {
     constructor: function ParametricCurve(f) {
         var self = this, _length = null, _bbox = null;
@@ -1403,13 +1447,22 @@ var ParametricCurve = makeClass(Curve, {
     transform: function(matrix) {
         return (new ParametricCurve(this.f)).setMatrix(matrix);
     },
-    fto: function(tt) {
-        var f = this.f, p1 = f(tt);
-        return new ParametricCurve(function(t) {return t > tt ? {x:p1.x, y:p1.y} : f(t);});
+    fto: function(t1) {
+        var f = this.f, p1 = f(t1);
+        return new ParametricCurve(function(t) {return t >= t1 ? {x:p1.x, y:p1.y} : f(t*t1);});
+    },
+    isClosed: function() {
+        var self = this, p = self._lines;
+        return 2 < p.length ? p_eq(p[0], p[p.length-1]) : false;
     },
     hasPoint: function(point) {
         return point_on_polyline(point, this._lines);
     },
+    hasInsidePoint: function(point, strict) {
+        if (!this.isClosed()) return false;
+        var inside = point_inside_polyline(point, {x:this._bbox.xmax+10, y:point.y}, this._lines);
+        return strict ? 1 === inside : 0 < inside;
+    },
     intersects: function(other) {
         var self = this, i;
         if (other instanceof Point)
@@ -1517,7 +1570,7 @@ var ParametricCurve = makeClass(Curve, {
             path = 'M ' + p.map(function(p) {
                 return Str(p.x)+' '+Str(p.y);
             }).join(' L ');
-        if (p_eq(p[0], p[p.length-1])) path += ' Z';
+        if (self.isClosed()) path += ' Z';
         return arguments.length ? SVG('path', {
             'id': [self.id, false],
             'd': [path, self.isChanged()],
@@ -1536,7 +1589,7 @@ var ParametricCurve = makeClass(Curve, {
         ctx.beginPath();
         ctx.moveTo(p[0].x, p[0].y);
         for (i=1; i<n; ++i) ctx.lineTo(p[i].x, p[i].y);
-        if (p_eq(p[0], p[n-1])) ctx.closePath();
+        if (self.isClosed()) ctx.closePath();
     },
     toTex: function() {
         return '\\text{ParametricCurve('+this.id+')}';
@@ -1547,11 +1600,19 @@ var ParametricCurve = makeClass(Curve, {
 });
 Geometrize.ParametricCurve = ParametricCurve;
 
-// 2D Composite Curve class (container of multiple, joined, curves)
 var MZ = /[M]/g,
     XY = /^\s*(-?\s*\d+(?:\.\d+)?)\s+(-?\s*\d+(?:\.\d+)?)/,
     PXY = /(-?\s*\d+(?:\.\d+)?)\s+(-?\s*\d+(?:\.\d+)?)\s*$/
 ;
+/**[DOC_MD]
+ * ### 2D Generic Composite Curve
+ *
+ * Represents a container of multiple, not necessarily joined curves
+ * ```javascript
+ * // construct a complex curve
+ * const curve = CompositeCurve([Line(p1, p2), QBezier([p3, p4, p5]), Line(p6, p7)]);
+ * ```
+[/DOC_MD]**/
 var CompositeCurve = makeClass(Curve, {
     constructor: function CompositeCurve(curves) {
         var self = this,
@@ -1937,7 +1998,14 @@ var CompositeCurve = makeClass(Curve, {
     }
 });
 Geometrize.CompositeCurve = CompositeCurve;
-// 2D Line segment class (equivalent to Linear Bezier curve)
+/**[DOC_MD]
+ * ### 2D Line Segment (equivalent to Linear Bezier)
+ *
+ * Represents a line segment between 2 points
+ * ```javascript
+ * const line = Line(p1, p2);
+ * ```
+[/DOC_MD]**/
 var Line = makeClass(Bezier, {
     constructor: function Line(start, end) {
         var self = this,
@@ -2148,8 +2216,14 @@ var Line = makeClass(Bezier, {
 });
 Geometrize.Line = Line;
 
-// 2D Polyline class
-// assembly of consecutive line segments between given points
+/**[DOC_MD]
+ * ### 2D Polyline
+ *
+ * Represents an assembly of consecutive line segments between given points
+ * ```javascript
+ * const polyline = Polyline([p1, p2, .., pn]);
+ * ```
+[/DOC_MD]**/
 var Polyline = makeClass(Curve, {
     constructor: function Polyline(points) {
         var self = this,
@@ -2261,7 +2335,7 @@ var Polyline = makeClass(Curve, {
     },
     isClosed: function() {
         var self = this, p = self.points;
-        return 2 < p.length ? p[0].eq(p[p.length-1]) : false;
+        return 2 < p.length ? p_eq(p[0], p[p.length-1]) : false;
     },
     isConvex: function() {
         return this._is_convex;
@@ -2414,7 +2488,14 @@ var Polyline = makeClass(Curve, {
     }
 });
 Geometrize.Polyline = Polyline;
-// 2D Elliptic Arc class
+/**[DOC_MD]
+ * ### 2D Elliptical Arc
+ *
+ * Represents an elliptic arc between start and end (points) having radiusX, radiusY and rotation angle and given largeArc and sweep flags
+ * ```javascript
+ * const arc = Arc(start, end, radiusX, radiusY, angle, largeArc, sweep);
+ * ```
+[/DOC_MD]**/
 var Arc = makeClass(Curve, {
     constructor: function Arc(start, end, radiusX, radiusY, angle, largeArc, sweep) {
         var self = this,
@@ -2850,7 +2931,14 @@ var Arc = makeClass(Curve, {
     }
 });
 Geometrize.Arc = Arc;
-// 2D Quadratic Bezier class
+/**[DOC_MD]
+ * ### 2D Quadratic Bezier
+ *
+ * Represents a quadratic bezier curve defined by its control points
+ * ```javascript
+ * const qbezier = QBezier([p1, p2, p3]);
+ * ```
+[/DOC_MD]**/
 var QBezier = makeClass(Bezier, {
     constructor: function QBezier(points) {
         var self = this,
@@ -3022,7 +3110,14 @@ var QBezier = makeClass(Bezier, {
     }
 });
 Geometrize.QBezier = QBezier;
-// 2D Cubic Bezier class
+/**[DOC_MD]
+ * ### 2D Cubic Bezier
+ *
+ * Represents a cubic bezier curve defined by its control points
+ * ```javascript
+ * const cbezier = CBezier([p1, p2, p3, p4]);
+ * ```
+[/DOC_MD]**/
 var CBezier = makeClass(Bezier, {
     constructor: function CBezier(points) {
         var self = this,
@@ -3199,8 +3294,14 @@ var CBezier = makeClass(Bezier, {
     }
 });
 Geometrize.CBezier = CBezier;
-// 2D Polygon class
-// defined by vertices as a closed polyline
+/**[DOC_MD]
+ * ### 2D Polygon
+ *
+ * Represents a polygon (a closed polyline) defined by its vertices
+ * ```javascript
+ * const polygon = Polygon([p1, p2, .., pn]);
+ * ```
+[/DOC_MD]**/
 var Polygon = makeClass(Curve, {
     constructor: function Polygon(vertices) {
         var self = this,
@@ -3528,7 +3629,14 @@ var Rect = makeClass(Polygon, {
     }
 });
 Geometrize.Rect = Rect;
-// 2D Circle class
+/**[DOC_MD]
+ * ### 2D Circle
+ *
+ * Represents a circle of given center (point) and radius
+ * ```javascript
+ * const circle = Circle(center, radius);
+ * ```
+[/DOC_MD]**/
 var Circle = makeClass(Curve, {
     constructor: function Circle(center, radius) {
         var self = this,
@@ -3724,7 +3832,14 @@ var Circle = makeClass(Curve, {
     }
 });
 Geometrize.Circle = Circle;
-// 2D Ellipse class
+/**[DOC_MD]
+ * ### 2D Ellipse
+ *
+ * Represents an ellipse of given center (point), radiusX, radiusY and rotation angle
+ * ```javascript
+ * const ellipse = Ellipse(center, radiusX, radiusY, angle);
+ * ```
+[/DOC_MD]**/
 var Ellipse = makeClass(Curve, {
     constructor: function Ellipse(center, radiusX, radiusY, angle) {
         var self = this,
@@ -4029,12 +4144,25 @@ var Ellipse = makeClass(Curve, {
     }
 });
 Geometrize.Ellipse = Ellipse;
-// 2D generic Shape class
-// container for primitives shapes
+/**[DOC_MD]
+ * ### 2D generic Shape
+ *
+ * container for 2D geometric objects, grouped together
+ * (not implemented yet)
+ *
+[/DOC_MD]**/
 var Shape = makeClass(Primitive, {});
 Geometrize.Shape = Shape;
-// Plane
-// scene container for 2D geometric objects
+/**[DOC_MD]
+ * ### 2D Plane
+ *
+ * scene container for 2D geometric objects
+ *
+ * ```javascript
+ * const plane = Plane(containerEl, viewBoxMinX, viewBoxMinY, viewBoxMaxX, viewBoxMaxY);
+ * plane.add(Line([p1, p2]));
+ * ```
+[/DOC_MD]**/
 var Plane = makeClass(null, {
     constructor: function Plane(dom, x0, y0, x1, y1) {
         var self = this,
diff --git a/build/Geometrize.min.js b/build/Geometrize.min.js
index 533962c..868b018 100644
--- a/build/Geometrize.min.js
+++ b/build/Geometrize.min.js
@@ -2,7 +2,7 @@
 *   Geometrize
 *   computational geometry and rendering library for JavaScript
 *
-*   @version 0.9.9 (2023-01-03 18:38:02)
+*   @version 0.9.8 (2023-01-04 10:07:44)
 *   https://github.com/foo123/Geometrize
 *
-**/!function(t,n,e){"use strict";"object"==typeof module&&module.exports?(module.$deps=module.$deps||{})&&(module.exports=module.$deps[n]=e.call(t)):"function"==typeof define&&define.amd&&"function"==typeof require&&"function"==typeof require.specified&&require.specified(n)?define(n,["module"],function(n){return e.moduleUri=n.uri,e.call(t)}):n in t||(t[n]=e.call(t)||1)&&"function"==typeof define&&define.amd&&define(function(){return t[n]})}("undefined"!=typeof self?self:this,"Geometrize",function(){"use strict";var y=Object.prototype.hasOwnProperty,t=Object.prototype.toString,b=Object.defineProperty,C=Math,$=C.abs,_=C.sqrt,l=C.pow,w=C.PI,P=2*w,a=1e-6,r=_(2),c=_(3),f=20,h=.01,g={},x=function(){},n="undefined"!=typeof global&&"[object global]"===t.call(global),p="undefined"!=typeof window&&"[object Window]"===t.call(window),i=(n?global:p&&window,{VERSION:"0.9.9",Math:{},Geometry:{}});function e(n,t,e){var r,i,o,u=y.call(t,"constructor")?t.constructor:function(){};for(r in 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diff --git a/convexhulls.png b/convexhulls.png
index a977565..312d3a4 100644
Binary files a/convexhulls.png and b/convexhulls.png differ
diff --git a/geometrize2.png b/geometrize2.png
new file mode 100644
index 0000000..8b7963b
Binary files /dev/null and b/geometrize2.png differ
diff --git a/intersections.png b/intersections.png
index 91488cc..a9d26b2 100644
Binary files a/intersections.png and b/intersections.png differ
diff --git a/manual.md b/manual.md
new file mode 100644
index 0000000..6a4bc6f
--- /dev/null
+++ b/manual.md
@@ -0,0 +1,156 @@
+
+### 2D Homogeneous Transformation Matrix
+
+Represents a homogeneous transformation matrix for 2D transforms
+
+```javascript
+const m = Matrix.translate(tx, ty).mul(Matrix.rotate(theta).mul(Matrix.scale(sx, sy)));
+// p is a point, p2 is a transformed point
+const p2 = m.transform(p);
+```
+
+
+
+### 2D Point
+
+Represents a point in 2D space
+
+```javascript
+const p = Point(x, y);
+```
+
+
+
+### 2D Topos
+
+Represents a geometric topos, ie a set of points
+```javascript
+const topos = Topos([p1, p2, p3, .., pn]);
+```
+
+
+
+### 2D Generic Curve Base Class
+
+Represents a generic curve in 2D space
+(not used directly)
+
+
+
+
+### 2D Generic Bezier Curve Base Class
+
+Represents a generic bezier curve in 2D space
+(not used directly)
+
+
+
+
+### 2D Generic Parametric Curve
+
+Represents a generic parametric curve in 2D space
+```javascript
+// construct a spiral (0 <= t <= 1)
+const spiral = ParametricCurve((t) => ({x: cx + t*r*Math.cos(t*6*Math.PI), y: cy + t*r*Math.sin(t*6*Math.PI)}));
+```
+
+
+
+### 2D Generic Composite Curve
+
+Represents a container of multiple, not necessarily joined curves
+```javascript
+// construct a complex curve
+const curve = CompositeCurve([Line(p1, p2), QBezier([p3, p4, p5]), Line(p6, p7)]);
+```
+
+
+
+### 2D Line Segment (equivalent to Linear Bezier)
+
+Represents a line segment between 2 points
+```javascript
+const line = Line(p1, p2);
+```
+
+
+
+### 2D Polyline
+
+Represents an assembly of consecutive line segments between given points
+```javascript
+const polyline = Polyline([p1, p2, .., pn]);
+```
+
+
+
+### 2D Elliptical Arc
+
+Represents an elliptic arc between start and end (points) having radiusX, radiusY and rotation angle and given largeArc and sweep flags
+```javascript
+const arc = Arc(start, end, radiusX, radiusY, angle, largeArc, sweep);
+```
+
+
+
+### 2D Quadratic Bezier
+
+Represents a quadratic bezier curve defined by its control points
+```javascript
+const qbezier = QBezier([p1, p2, p3]);
+```
+
+
+
+### 2D Cubic Bezier
+
+Represents a cubic bezier curve defined by its control points
+```javascript
+const cbezier = CBezier([p1, p2, p3, p4]);
+```
+
+
+
+### 2D Polygon
+
+Represents a polygon (a closed polyline) defined by its vertices
+```javascript
+const polygon = Polygon([p1, p2, .., pn]);
+```
+
+
+
+### 2D Circle
+
+Represents a circle of given center (point) and radius
+```javascript
+const circle = Circle(center, radius);
+```
+
+
+
+### 2D Ellipse
+
+Represents an ellipse of given center (point), radiusX, radiusY and rotation angle
+```javascript
+const ellipse = Ellipse(center, radiusX, radiusY, angle);
+```
+
+
+
+### 2D generic Shape
+
+container for 2D geometric objects, grouped together
+(not implemented yet)
+
+
+
+
+### 2D Plane
+
+scene container for 2D geometric objects
+
+```javascript
+const plane = Plane(containerEl, viewBoxMinX, viewBoxMinY, viewBoxMaxX, viewBoxMaxY);
+plane.add(Line([p1, p2]));
+```
diff --git a/src/Arc.js b/src/Arc.js
index 07359fe..80d8d84 100644
--- a/src/Arc.js
+++ b/src/Arc.js
@@ -1,4 +1,11 @@
-// 2D Elliptic Arc class
+/**[DOC_MD]
+ * ### 2D Elliptical Arc
+ *
+ * Represents an elliptic arc between start and end (points) having radiusX, radiusY and rotation angle and given largeArc and sweep flags
+ * ```javascript
+ * const arc = Arc(start, end, radiusX, radiusY, angle, largeArc, sweep);
+ * ```
+[/DOC_MD]**/
 var Arc = makeClass(Curve, {
     constructor: function Arc(start, end, radiusX, radiusY, angle, largeArc, sweep) {
         var self = this,
diff --git a/src/CBezier.js b/src/CBezier.js
index b9290f0..ea2e2f9 100644
--- a/src/CBezier.js
+++ b/src/CBezier.js
@@ -1,4 +1,11 @@
-// 2D Cubic Bezier class
+/**[DOC_MD]
+ * ### 2D Cubic Bezier
+ *
+ * Represents a cubic bezier curve defined by its control points
+ * ```javascript
+ * const cbezier = CBezier([p1, p2, p3, p4]);
+ * ```
+[/DOC_MD]**/
 var CBezier = makeClass(Bezier, {
     constructor: function CBezier(points) {
         var self = this,
diff --git a/src/Circle.js b/src/Circle.js
index f9c1eb3..49b685f 100644
--- a/src/Circle.js
+++ b/src/Circle.js
@@ -1,4 +1,11 @@
-// 2D Circle class
+/**[DOC_MD]
+ * ### 2D Circle
+ *
+ * Represents a circle of given center (point) and radius
+ * ```javascript
+ * const circle = Circle(center, radius);
+ * ```
+[/DOC_MD]**/
 var Circle = makeClass(Curve, {
     constructor: function Circle(center, radius) {
         var self = this,
diff --git a/src/Color.js b/src/Color.js
deleted file mode 100644
index e496b55..0000000
--- a/src/Color.js
+++ /dev/null
@@ -1,324 +0,0 @@
-// Color utilities
-// eg for stroke, fill, ..
-var hexRE = /^#([0-9a-fA-F]{3,6})\b/,
-    rgbRE = /^(rgba?)\b\s*\(([^\)]*)\)/i,
-    hslRE = /^(hsla?)\b\s*\(([^\)]*)\)/i,
-    hwbRE = /^(hwba?)\b\s*\(([^\)]*)\)/i,
-    sepRE = /\s+|,/gm, aRE = /\/\s*(\d*?\.?\d+%?)/;
-
-function hex2rgb(h)
-{
-    if (!h || 3 > h.length)
-    {
-        return [0, 0, 0, 0];
-    }
-    else if (6 > h.length)
-    {
-        return [
-        clamp(parseInt(h[0]+h[0], 16)||0, 0, 255),
-        clamp(parseInt(h[1]+h[1], 16)||0, 0, 255),
-        clamp(parseInt(h[2]+h[2], 16)||0, 0, 255),
-        1
-        ];
-    }
-    else
-    {
-        return [
-        clamp(parseInt(h[0]+h[1], 16)||0, 0, 255),
-        clamp(parseInt(h[2]+h[3], 16)||0, 0, 255),
-        clamp(parseInt(h[4]+h[5], 16)||0, 0, 255),
-        1
-        ];
-    }
-}
-function hsl2rgb(h, s, l, a)
-{
-    var c, hp, d, x, m, r, g, b;
-    s /= 100;
-    l /= 100;
-    c = (1 - abs(2*l - 1))*s;
-    hp = h/60;
-    d = stdMath.floor(hp / 2);
-    x = c*(1 - abs(hp - 2*d - 1));
-    m = l - c/2;
-    if (hp >= 0 && hp < 1)
-    {
-        r = c + m;
-        g = x + m;
-        b = 0 + m;
-    }
-    else if (hp >= 1 && hp < 2)
-    {
-        r = x + m;
-        g = c + m;
-        b = 0 + m;
-    }
-    else if (hp >= 2 && hp < 3)
-    {
-        r = 0 + m;
-        g = c + m;
-        b = x + m;
-    }
-    else if (hp >= 3 && hp < 4)
-    {
-        r = 0 + m;
-        g = x + m;
-        b = c + m;
-    }
-    else if (hp >= 4 && hp < 5)
-    {
-        r = x + m;
-        g = 0 + m;
-        b = c + m;
-    }
-    else //if (hp >= 5 && hp < 6)
-    {
-        r = c + m;
-        g = 0 + m;
-        b = x + m;
-    }
-    return [
-    clamp(stdMath.round(r*255), 0, 255),
-    clamp(stdMath.round(g*255), 0, 255),
-    clamp(stdMath.round(b*255), 0, 255),
-    a
-    ];
-}
-function hsv2rgb(h, s, v, a)
-{
-    v /= 100;
-    var l = v*(1 - s/200), lm = stdMath.min(l, 1-l);
-    return hsl2rgb(h, 0 === lm ? 0 : 100*(v-l)/lm, 100*l, a);
-}
-function hwb2rgb(h, w, b, a)
-{
-    var b1 = 1 - b/100;
-    return hsv2rgb(h, 100 - w/b1, 100*b1, a);
-}
-function parseColor(s)
-{
-    var m, hasOpacity;
-    s = trim(Str(s)).toLowerCase();
-    if (m = s.match(hexRE))
-    {
-        // hex
-        return hex2rgb(m[1]);
-    }
-    if (m = s.match(hwbRE))
-    {
-        // hwb(a)
-        hasOpacity = m[2].match(aRE);
-        var col = trim(m[2]).split(sepRE).map(trim),
-            h = col[0] ? col[0] : '0',
-            w = col[1] ? col[1] : '0',
-            b = col[2] ? col[2] : '0',
-            a = hasOpacity ? hasOpacity[1] : '1';
-        h = parseFloat(h, 10);
-        w = '%' === w.slice(-1) ? parseFloat(w, 10) : parseFloat(w, 10)*100/255;
-        b = '%' === b.slice(-1) ? parseFloat(b, 10) : parseFloat(b, 10)*100/255;
-        a = '%' === a.slice(-1) ? parseFloat(a, 10)/100 : parseFloat(a, 10);
-        return hwb2rgb(h, w, b, a);
-    }
-    if (m = s.match(hslRE))
-    {
-        // hsl(a)
-        hasOpacity = m[2].match(aRE);
-        var col = trim(m[2]).split(sepRE).map(trim),
-            h = col[0] ? col[0] : '0',
-            s = col[1] ? col[1] : '0',
-            l = col[2] ? col[2] : '0',
-            a = hasOpacity ? hasOpacity[1] : ('hsla' === m[1] && null != col[3] ? col[3] : '1');
-        h = parseFloat(h, 10);
-        s = '%' === s.slice(-1) ? parseFloat(s, 10) : parseFloat(s, 10)*100/255;
-        l = '%' === l.slice(-1) ? parseFloat(l, 10) : parseFloat(l, 10)*100/255;
-        a = '%' === a.slice(-1) ? parseFloat(a, 10)/100 : parseFloat(a, 10);
-        return hsl2rgb(h, s, l, a);
-    }
-    if (m = s.match(rgbRE))
-    {
-        // rgb(a)
-        hasOpacity = m[2].match(aRE);
-        var col = trim(m[2]).split(sepRE).map(trim),
-            r = col[0] ? col[0] : '0',
-            g = col[1] ? col[1] : '0',
-            b = col[2] ? col[2] : '0',
-            a = hasOpacity ? hasOpacity[1] : ('rgba' === m[1] && null != col[3] ? col[3] : '1');
-        r = '%' === r.slice(-1) ? parseFloat(r, 10)*2.55 : parseFloat(r, 10);
-        g = '%' === g.slice(-1) ? parseFloat(g, 10)*2.55 : parseFloat(g, 10);
-        b = '%' === b.slice(-1) ? parseFloat(b, 10)*2.55 : parseFloat(b, 10);
-        a = '%' === a.slice(-1) ? parseFloat(a, 10)/100 : parseFloat(a, 10);
-        return [r, g, b, a];
-    }
-    if (HAS.call(Color.keywords, s))
-    {
-        // keyword
-        return Color.keywords[s].slice();
-    }
-}
-var Color = {
-    keywords: {
-    // https://developer.mozilla.org/en-US/docs/Web/CSS/color_value
-    /* extended */
-     'transparent'         : [  0,0,0        ,0]
-    ,'aliceblue'           : [  240,248,255  ,1]
-    ,'antiquewhite'        : [  250,235,215  ,1]
-    ,'aqua'                : [  0,255,255    ,1]
-    ,'aquamarine'          : [  127,255,212  ,1]
-    ,'azure'               : [  240,255,255  ,1]
-    ,'beige'               : [  245,245,220  ,1]
-    ,'bisque'              : [  255,228,196  ,1]
-    ,'black'               : [  0,0,0    ,    1]
-    ,'blanchedalmond'      : [  255,235,205  ,1]
-    ,'blue'                : [  0,0,255  ,    1]
-    ,'blueviolet'          : [  138,43,226   ,1]
-    ,'brown'               : [  165,42,42    ,1]
-    ,'burlywood'           : [  222,184,135  ,1]
-    ,'cadetblue'           : [  95,158,160   ,1]
-    ,'chartreuse'          : [  127,255,0    ,1]
-    ,'chocolate'           : [  210,105,30   ,1]
-    ,'coral'               : [  255,127,80   ,1]
-    ,'cornflowerblue'      : [  100,149,237  ,1]
-    ,'cornsilk'            : [  255,248,220  ,1]
-    ,'crimson'             : [  220,20,60    ,1]
-    ,'cyan'                : [  0,255,255    ,1]
-    ,'darkblue'            : [  0,0,139  ,    1]
-    ,'darkcyan'            : [  0,139,139    ,1]
-    ,'darkgoldenrod'       : [  184,134,11   ,1]
-    ,'darkgray'            : [  169,169,169  ,1]
-    ,'darkgreen'           : [  0,100,0  ,    1]
-    ,'darkgrey'            : [  169,169,169  ,1]
-    ,'darkkhaki'           : [  189,183,107  ,1]
-    ,'darkmagenta'         : [  139,0,139    ,1]
-    ,'darkolivegreen'      : [  85,107,47    ,1]
-    ,'darkorange'          : [  255,140,0    ,1]
-    ,'darkorchid'          : [  153,50,204   ,1]
-    ,'darkred'             : [  139,0,0  ,    1]
-    ,'darksalmon'          : [  233,150,122  ,1]
-    ,'darkseagreen'        : [  143,188,143  ,1]
-    ,'darkslateblue'       : [  72,61,139    ,1]
-    ,'darkslategray'       : [  47,79,79 ,    1]
-    ,'darkslategrey'       : [  47,79,79 ,    1]
-    ,'darkturquoise'       : [  0,206,209    ,1]
-    ,'darkviolet'          : [  148,0,211    ,1]
-    ,'deeppink'            : [  255,20,147   ,1]
-    ,'deepskyblue'         : [  0,191,255    ,1]
-    ,'dimgray'             : [  105,105,105  ,1]
-    ,'dimgrey'             : [  105,105,105  ,1]
-    ,'dodgerblue'          : [  30,144,255   ,1]
-    ,'firebrick'           : [  178,34,34    ,1]
-    ,'floralwhite'         : [  255,250,240  ,1]
-    ,'forestgreen'         : [  34,139,34    ,1]
-    ,'fuchsia'             : [  255,0,255    ,1]
-    ,'gainsboro'           : [  220,220,220  ,1]
-    ,'ghostwhite'          : [  248,248,255  ,1]
-    ,'gold'                : [  255,215,0    ,1]
-    ,'goldenrod'           : [  218,165,32   ,1]
-    ,'gray'                : [  128,128,128  ,1]
-    ,'green'               : [  0,128,0  ,    1]
-    ,'greenyellow'         : [  173,255,47   ,1]
-    ,'grey'                : [  128,128,128  ,1]
-    ,'honeydew'            : [  240,255,240  ,1]
-    ,'hotpink'             : [  255,105,180  ,1]
-    ,'indianred'           : [  205,92,92    ,1]
-    ,'indigo'              : [  75,0,130 ,    1]
-    ,'ivory'               : [  255,255,240  ,1]
-    ,'khaki'               : [  240,230,140  ,1]
-    ,'lavender'            : [  230,230,250  ,1]
-    ,'lavenderblush'       : [  255,240,245  ,1]
-    ,'lawngreen'           : [  124,252,0    ,1]
-    ,'lemonchiffon'        : [  255,250,205  ,1]
-    ,'lightblue'           : [  173,216,230  ,1]
-    ,'lightcoral'          : [  240,128,128  ,1]
-    ,'lightcyan'           : [  224,255,255  ,1]
-    ,'lightgoldenrodyellow': [  250,250,210  ,1]
-    ,'lightgray'           : [  211,211,211  ,1]
-    ,'lightgreen'          : [  144,238,144  ,1]
-    ,'lightgrey'           : [  211,211,211  ,1]
-    ,'lightpink'           : [  255,182,193  ,1]
-    ,'lightsalmon'         : [  255,160,122  ,1]
-    ,'lightseagreen'       : [  32,178,170   ,1]
-    ,'lightskyblue'        : [  135,206,250  ,1]
-    ,'lightslategray'      : [  119,136,153  ,1]
-    ,'lightslategrey'      : [  119,136,153  ,1]
-    ,'lightsteelblue'      : [  176,196,222  ,1]
-    ,'lightyellow'         : [  255,255,224  ,1]
-    ,'lime'                : [  0,255,0  ,    1]
-    ,'limegreen'           : [  50,205,50    ,1]
-    ,'linen'               : [  250,240,230  ,1]
-    ,'magenta'             : [  255,0,255    ,1]
-    ,'maroon'              : [  128,0,0  ,    1]
-    ,'mediumaquamarine'    : [  102,205,170  ,1]
-    ,'mediumblue'          : [  0,0,205  ,    1]
-    ,'mediumorchid'        : [  186,85,211   ,1]
-    ,'mediumpurple'        : [  147,112,219  ,1]
-    ,'mediumseagreen'      : [  60,179,113   ,1]
-    ,'mediumslateblue'     : [  123,104,238  ,1]
-    ,'mediumspringgreen'   : [  0,250,154    ,1]
-    ,'mediumturquoise'     : [  72,209,204   ,1]
-    ,'mediumvioletred'     : [  199,21,133   ,1]
-    ,'midnightblue'        : [  25,25,112    ,1]
-    ,'mintcream'           : [  245,255,250  ,1]
-    ,'mistyrose'           : [  255,228,225  ,1]
-    ,'moccasin'            : [  255,228,181  ,1]
-    ,'navajowhite'         : [  255,222,173  ,1]
-    ,'navy'                : [  0,0,128  ,    1]
-    ,'oldlace'             : [  253,245,230  ,1]
-    ,'olive'               : [  128,128,0    ,1]
-    ,'olivedrab'           : [  107,142,35   ,1]
-    ,'orange'              : [  255,165,0    ,1]
-    ,'orangered'           : [  255,69,0 ,    1]
-    ,'orchid'              : [  218,112,214  ,1]
-    ,'palegoldenrod'       : [  238,232,170  ,1]
-    ,'palegreen'           : [  152,251,152  ,1]
-    ,'paleturquoise'       : [  175,238,238  ,1]
-    ,'palevioletred'       : [  219,112,147  ,1]
-    ,'papayawhip'          : [  255,239,213  ,1]
-    ,'peachpuff'           : [  255,218,185  ,1]
-    ,'peru'                : [  205,133,63   ,1]
-    ,'pink'                : [  255,192,203  ,1]
-    ,'plum'                : [  221,160,221  ,1]
-    ,'powderblue'          : [  176,224,230  ,1]
-    ,'purple'              : [  128,0,128    ,1]
-    ,'red'                 : [  255,0,0  ,    1]
-    ,'rosybrown'           : [  188,143,143  ,1]
-    ,'royalblue'           : [  65,105,225   ,1]
-    ,'saddlebrown'         : [  139,69,19    ,1]
-    ,'salmon'              : [  250,128,114  ,1]
-    ,'sandybrown'          : [  244,164,96   ,1]
-    ,'seagreen'            : [  46,139,87    ,1]
-    ,'seashell'            : [  255,245,238  ,1]
-    ,'sienna'              : [  160,82,45    ,1]
-    ,'silver'              : [  192,192,192  ,1]
-    ,'skyblue'             : [  135,206,235  ,1]
-    ,'slateblue'           : [  106,90,205   ,1]
-    ,'slategray'           : [  112,128,144  ,1]
-    ,'slategrey'           : [  112,128,144  ,1]
-    ,'snow'                : [  255,250,250  ,1]
-    ,'springgreen'         : [  0,255,127    ,1]
-    ,'steelblue'           : [  70,130,180   ,1]
-    ,'tan'                 : [  210,180,140  ,1]
-    ,'teal'                : [  0,128,128    ,1]
-    ,'thistle'             : [  216,191,216  ,1]
-    ,'tomato'              : [  255,99,71    ,1]
-    ,'turquoise'           : [  64,224,208   ,1]
-    ,'violet'              : [  238,130,238  ,1]
-    ,'wheat'               : [  245,222,179  ,1]
-    ,'white'               : [  255,255,255  ,1]
-    ,'whitesmoke'          : [  245,245,245  ,1]
-    ,'yellow'              : [  255,255,0    ,1]
-    ,'yellowgreen'         : [  154,205,50   ,1]
-    },
-    parse: parseColor,
-    toCSS: function(r, g, b, a) {
-        if (1 === arguments.length)
-        {
-            var rgba = r;
-            return 3 < rgba.length ? 'rgba('+rgba[0]+','+rgba[1]+','+rgba[2]+','+rgba[3]+')' : 'rgb('+rgba[0]+','+rgba[1]+','+rgba[2]+')';
-        }
-        else
-        {
-            return 3 < arguments.length ? 'rgba('+r+','+g+','+b+','+a+')' : 'rgb('+r+','+g+','+b+')';
-        }
-    }
-};
-Geometrize.Color = Color;
diff --git a/src/Curve.js b/src/Curve.js
index 028fddd..2252170 100644
--- a/src/Curve.js
+++ b/src/Curve.js
@@ -1,4 +1,10 @@
-// 2D generic Curve base class
+/**[DOC_MD]
+ * ### 2D Generic Curve Base Class
+ *
+ * Represents a generic curve in 2D space
+ * (not used directly)
+ *
+[/DOC_MD]**/
 var Curve = makeClass(Topos, {
     constructor: function Curve(points, values) {
         var self = this,
@@ -240,7 +246,13 @@ var Curve = makeClass(Topos, {
 });
 Geometrize.Curve = Curve;
 
-// 2D generic Bezier curve base class
+/**[DOC_MD]
+ * ### 2D Generic Bezier Curve Base Class
+ *
+ * Represents a generic bezier curve in 2D space
+ * (not used directly)
+ *
+[/DOC_MD]**/
 var Bezier = makeClass(Curve, {
     constructor: function Bezier(points, values) {
         var self = this;
@@ -296,7 +308,15 @@ var Bezier = makeClass(Curve, {
 });
 Geometrize.Bezier = Bezier;
 
-// 2D generix Parametric Curve class (defined by parametric function f)
+/**[DOC_MD]
+ * ### 2D Generic Parametric Curve
+ *
+ * Represents a generic parametric curve in 2D space
+ * ```javascript
+ * // construct a spiral (0 <= t <= 1)
+ * const spiral = ParametricCurve((t) => ({x: cx + t*r*Math.cos(t*6*Math.PI), y: cy + t*r*Math.sin(t*6*Math.PI)}));
+ * ```
+[/DOC_MD]**/
 var ParametricCurve = makeClass(Curve, {
     constructor: function ParametricCurve(f) {
         var self = this, _length = null, _bbox = null;
@@ -355,13 +375,22 @@ var ParametricCurve = makeClass(Curve, {
     transform: function(matrix) {
         return (new ParametricCurve(this.f)).setMatrix(matrix);
     },
-    fto: function(tt) {
-        var f = this.f, p1 = f(tt);
-        return new ParametricCurve(function(t) {return t > tt ? {x:p1.x, y:p1.y} : f(t);});
+    fto: function(t1) {
+        var f = this.f, p1 = f(t1);
+        return new ParametricCurve(function(t) {return t >= t1 ? {x:p1.x, y:p1.y} : f(t*t1);});
+    },
+    isClosed: function() {
+        var self = this, p = self._lines;
+        return 2 < p.length ? p_eq(p[0], p[p.length-1]) : false;
     },
     hasPoint: function(point) {
         return point_on_polyline(point, this._lines);
     },
+    hasInsidePoint: function(point, strict) {
+        if (!this.isClosed()) return false;
+        var inside = point_inside_polyline(point, {x:this._bbox.xmax+10, y:point.y}, this._lines);
+        return strict ? 1 === inside : 0 < inside;
+    },
     intersects: function(other) {
         var self = this, i;
         if (other instanceof Point)
@@ -469,7 +498,7 @@ var ParametricCurve = makeClass(Curve, {
             path = 'M ' + p.map(function(p) {
                 return Str(p.x)+' '+Str(p.y);
             }).join(' L ');
-        if (p_eq(p[0], p[p.length-1])) path += ' Z';
+        if (self.isClosed()) path += ' Z';
         return arguments.length ? SVG('path', {
             'id': [self.id, false],
             'd': [path, self.isChanged()],
@@ -488,7 +517,7 @@ var ParametricCurve = makeClass(Curve, {
         ctx.beginPath();
         ctx.moveTo(p[0].x, p[0].y);
         for (i=1; i<n; ++i) ctx.lineTo(p[i].x, p[i].y);
-        if (p_eq(p[0], p[n-1])) ctx.closePath();
+        if (self.isClosed()) ctx.closePath();
     },
     toTex: function() {
         return '\\text{ParametricCurve('+this.id+')}';
@@ -499,11 +528,19 @@ var ParametricCurve = makeClass(Curve, {
 });
 Geometrize.ParametricCurve = ParametricCurve;
 
-// 2D Composite Curve class (container of multiple, joined, curves)
 var MZ = /[M]/g,
     XY = /^\s*(-?\s*\d+(?:\.\d+)?)\s+(-?\s*\d+(?:\.\d+)?)/,
     PXY = /(-?\s*\d+(?:\.\d+)?)\s+(-?\s*\d+(?:\.\d+)?)\s*$/
 ;
+/**[DOC_MD]
+ * ### 2D Generic Composite Curve
+ *
+ * Represents a container of multiple, not necessarily joined curves
+ * ```javascript
+ * // construct a complex curve
+ * const curve = CompositeCurve([Line(p1, p2), QBezier([p3, p4, p5]), Line(p6, p7)]);
+ * ```
+[/DOC_MD]**/
 var CompositeCurve = makeClass(Curve, {
     constructor: function CompositeCurve(curves) {
         var self = this,
diff --git a/src/Ellipse.js b/src/Ellipse.js
index 67a9595..2da5a4c 100644
--- a/src/Ellipse.js
+++ b/src/Ellipse.js
@@ -1,4 +1,11 @@
-// 2D Ellipse class
+/**[DOC_MD]
+ * ### 2D Ellipse
+ *
+ * Represents an ellipse of given center (point), radiusX, radiusY and rotation angle
+ * ```javascript
+ * const ellipse = Ellipse(center, radiusX, radiusY, angle);
+ * ```
+[/DOC_MD]**/
 var Ellipse = makeClass(Curve, {
     constructor: function Ellipse(center, radiusX, radiusY, angle) {
         var self = this,
diff --git a/src/Line.js b/src/Line.js
index f83b9a2..76c8866 100644
--- a/src/Line.js
+++ b/src/Line.js
@@ -1,4 +1,11 @@
-// 2D Line segment class (equivalent to Linear Bezier curve)
+/**[DOC_MD]
+ * ### 2D Line Segment (equivalent to Linear Bezier)
+ *
+ * Represents a line segment between 2 points
+ * ```javascript
+ * const line = Line(p1, p2);
+ * ```
+[/DOC_MD]**/
 var Line = makeClass(Bezier, {
     constructor: function Line(start, end) {
         var self = this,
diff --git a/src/Matrix.js b/src/Matrix.js
index 18711cb..ab94626 100644
--- a/src/Matrix.js
+++ b/src/Matrix.js
@@ -1,4 +1,14 @@
-// 2D Homogeneous Transformation Matrix class
+/**[DOC_MD]
+ * ### 2D Homogeneous Transformation Matrix
+ *
+ * Represents a homogeneous transformation matrix for 2D transforms
+ *
+ * ```javascript
+ * const m = Matrix.translate(tx, ty).mul(Matrix.rotate(theta).mul(Matrix.scale(sx, sy)));
+ * // p is a point, p2 is a transformed point
+ * const p2 = m.transform(p);
+ * ```
+[/DOC_MD]**/
 var Matrix = makeClass(null, {
     constructor: function Matrix(
         m00, m01, m02,
@@ -79,12 +89,12 @@ var Matrix = makeClass(null, {
         if (other instanceof Matrix)
         {
             return new Matrix(
-                self.$00*other.$00 + self.$01*other.$10 + self.$02*other.$20,
-                self.$00*other.$01 + self.$01*other.$11 + self.$02*other.$21,
-                self.$00*other.$02 + self.$01*other.$12 + self.$02*other.$22,
-                self.$10*other.$00 + self.$11*other.$10 + self.$12*other.$20,
-                self.$10*other.$01 + self.$11*other.$11 + self.$12*other.$21,
-                self.$10*other.$02 + self.$11*other.$12 + self.$12*other.$22
+                self.$00*other.$00 + self.$01*other.$10,
+                self.$00*other.$01 + self.$01*other.$11,
+                self.$00*other.$02 + self.$01*other.$12 + self.$02,
+                self.$10*other.$00 + self.$11*other.$10,
+                self.$10*other.$01 + self.$11*other.$11,
+                self.$10*other.$02 + self.$11*other.$12 + self.$12
             );
         }
         else
@@ -98,13 +108,12 @@ var Matrix = makeClass(null, {
     },
     det: function() {
         var self = this;
-        return self.$00*(self.$11*self.$22 - self.$12*self.$21) + self.$01*(self.$12*self.$20 - self.$10*self.$22) + self.$02*(self.$21*self.$10 - self.$11*self.$20);
+        return self.$00*(self.$11*/*self.$22*/1 - self.$12*/*self.$21*/0) + self.$01*(self.$12*/*self.$20*/0 - self.$10*/*self.$22*/1) + self.$02*(0/*self.$21*/*self.$10 - self.$11*/*self.$20*/0);
     },
     inv: function() {
         var self = this,
             a00 = self.$00, a01 = self.$01, a02 = self.$02,
             a10 = self.$10, a11 = self.$11, a12 = self.$12,
-            //a20 = self.$20, a21 = self.$21, a22 = self.$22,
             det2 = a00*a11 - a01*a10,
             i00 = 0, i01 = 0, i10 = 0, i11 = 0;
 
diff --git a/src/Plane.js b/src/Plane.js
index fbb7f86..b048a30 100644
--- a/src/Plane.js
+++ b/src/Plane.js
@@ -1,5 +1,13 @@
-// Plane
-// scene container for 2D geometric objects
+/**[DOC_MD]
+ * ### 2D Plane
+ *
+ * scene container for 2D geometric objects
+ *
+ * ```javascript
+ * const plane = Plane(containerEl, viewBoxMinX, viewBoxMinY, viewBoxMaxX, viewBoxMaxY);
+ * plane.add(Line([p1, p2]));
+ * ```
+[/DOC_MD]**/
 var Plane = makeClass(null, {
     constructor: function Plane(dom, x0, y0, x1, y1) {
         var self = this,
diff --git a/src/Point.js b/src/Point.js
index 6763409..2e5e2b8 100644
--- a/src/Point.js
+++ b/src/Point.js
@@ -1,4 +1,12 @@
-// 2D Point class
+/**[DOC_MD]
+ * ### 2D Point
+ *
+ * Represents a point in 2D space
+ * 
+ * ```javascript
+ * const p = Point(x, y);
+ * ```
+[/DOC_MD]**/
 var Point = makeClass(Primitive, {
     constructor: function Point(x, y) {
         var self = this, _x = 0, _y = 0, _n = null;
diff --git a/src/Polygon.js b/src/Polygon.js
index b2bcb3c..f8103d8 100644
--- a/src/Polygon.js
+++ b/src/Polygon.js
@@ -1,5 +1,11 @@
-// 2D Polygon class
-// defined by vertices as a closed polyline
+/**[DOC_MD]
+ * ### 2D Polygon
+ *
+ * Represents a polygon (a closed polyline) defined by its vertices
+ * ```javascript
+ * const polygon = Polygon([p1, p2, .., pn]);
+ * ```
+[/DOC_MD]**/
 var Polygon = makeClass(Curve, {
     constructor: function Polygon(vertices) {
         var self = this,
diff --git a/src/Polyline.js b/src/Polyline.js
index d33febe..062d40d 100644
--- a/src/Polyline.js
+++ b/src/Polyline.js
@@ -1,5 +1,11 @@
-// 2D Polyline class
-// assembly of consecutive line segments between given points
+/**[DOC_MD]
+ * ### 2D Polyline
+ *
+ * Represents an assembly of consecutive line segments between given points
+ * ```javascript
+ * const polyline = Polyline([p1, p2, .., pn]);
+ * ```
+[/DOC_MD]**/
 var Polyline = makeClass(Curve, {
     constructor: function Polyline(points) {
         var self = this,
@@ -111,7 +117,7 @@ var Polyline = makeClass(Curve, {
     },
     isClosed: function() {
         var self = this, p = self.points;
-        return 2 < p.length ? p[0].eq(p[p.length-1]) : false;
+        return 2 < p.length ? p_eq(p[0], p[p.length-1]) : false;
     },
     isConvex: function() {
         return this._is_convex;
diff --git a/src/QBezier.js b/src/QBezier.js
index 9584250..a3d85a6 100644
--- a/src/QBezier.js
+++ b/src/QBezier.js
@@ -1,4 +1,11 @@
-// 2D Quadratic Bezier class
+/**[DOC_MD]
+ * ### 2D Quadratic Bezier
+ *
+ * Represents a quadratic bezier curve defined by its control points
+ * ```javascript
+ * const qbezier = QBezier([p1, p2, p3]);
+ * ```
+[/DOC_MD]**/
 var QBezier = makeClass(Bezier, {
     constructor: function QBezier(points) {
         var self = this,
diff --git a/src/Shape.js b/src/Shape.js
index 46bc13e..8b84f3f 100644
--- a/src/Shape.js
+++ b/src/Shape.js
@@ -1,4 +1,9 @@
-// 2D generic Shape class
-// container for primitives shapes
+/**[DOC_MD]
+ * ### 2D generic Shape
+ *
+ * container for 2D geometric objects, grouped together
+ * (not implemented yet)
+ *
+[/DOC_MD]**/
 var Shape = makeClass(Primitive, {});
 Geometrize.Shape = Shape;
diff --git a/src/Topos.js b/src/Topos.js
index d732b1c..b471044 100644
--- a/src/Topos.js
+++ b/src/Topos.js
@@ -1,4 +1,11 @@
-// 2D geometric Topos ie set of points
+/**[DOC_MD]
+ * ### 2D Topos
+ *
+ * Represents a geometric topos, ie a set of points
+ * ```javascript
+ * const topos = Topos([p1, p2, p3, .., pn]);
+ * ```
+[/DOC_MD]**/
 var Topos = makeClass(Primitive, {
     constructor: function Topos(points) {
         var self = this,
diff --git a/test/intersect.html b/test/intersect.html
index 50c0ee1..323a6e2 100644
--- a/test/intersect.html
+++ b/test/intersect.html
@@ -72,7 +72,6 @@ <h1>Geometrize Intersections, Bounding Boxes, Convex Hulls</h1>
 };
 const drawConvexHull = (shape, color) => {
     const hull = shape.getConvexHull();
-    console.log(shape.name, hull);
     plane.add(Polygon(hull).setStyle('stroke', color||'red'));
 };