add doc

README.md

@@ -235,7 +235,7 @@ See [examples](examples).
 
 ### Voronoi
 - [voronoi/vrn2_from](https://openhome.cc/eGossip/OpenSCAD/lib2x-vrn2_from.html)
-- voronoi/vrn2_space
+- [voronoi/vrn2_space](https://openhome.cc/eGossip/OpenSCAD/lib2x-vrn2_space.html)
 - [voronoi/vrn2_cells_from](https://openhome.cc/eGossip/OpenSCAD/lib2x-vrn2_cells_from.html)
 - voronoi/vrn2_cells_space
 - voronoi/vrn3_from

docs/lib2x-vrn2_space.md

@@ -0,0 +1,42 @@
+# vrn2_space
+
+Creats a [Voronoi diagram](https://en.wikipedia.org/wiki/Voronoi_diagram) in the first quadrant. You specify a space and a grid width. The center of each cell will be distributed in each grid randomly.
+
+**Since:** 2.4
+
+## Parameters
+
+- `size` : 2 value array [x, y], rectangle with dimensions x and y.
+- `grid_w` : The width of each grid. If it can split `size` equally, the voronoi diagram is seamless at the junction of top-bottom and left-right. 
+- `seed` : Seed value for random number generator for repeatable results.
+- `spacing` : Distance between cells. Default to 1.
+- `r`, `delta`, `chamfer` : The outlines of each cell can be moved outward or inward. These parameters have the same effect as [`offset`](https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Transformations#offset). 
+- `region_type` : The initial shape for each cell can be `"square"` or `"circle"`. Default to `"square"`.
+
+## Examples
+
+    use <voronoi/vrn2_space.scad>;
+
+    vrn2_space(
+        size = [40, 20],
+        grid_w = 5
+    );
+
+![vrn2_space](images/lib2x-vrn2_space-1.JPG)
+
+    use <bend_extrude.scad>;
+    use <voronoi/vrn2_space.scad>;
+
+    size = [60, 20];
+
+    bend_extrude(size = size, thickness = 1, angle = 360) 
+        difference() {
+            square(size);
+            vrn2_space(
+                size = size,
+                grid_w = 5,
+                seed = 1
+            );
+        }
+    
+![vrn2_space](images/lib2x-vrn2_space-2.JPG)

src/voronoi/vrn2_space.scad

@@ -1,3 +1,13 @@
+/**
+* vrn2_space.scad
+*
+* @copyright Justin Lin, 2020
+* @license https://opensource.org/licenses/lgpl-3.0.html
+*
+* @see https://openhome.cc/eGossip/OpenSCAD/lib2x-vrn2_space.html
+*
+**/
+
 module vrn2_space(size, grid_w, seed, spacing = 1, r = 0, delta = 0, chamfer = false, region_type = "square") {
     _noise_table = [0.592157, 0.627451, 0.537255, 0.356863, 0.352941, 0.0588235, 0.513725, 0.0509804, 0.788235, 0.372549, 0.376471, 0.207843, 0.760784, 0.913725, 0.027451, 0.882353, 0.54902, 0.141176, 0.403922, 0.117647, 0.270588, 0.556863, 0.0313725, 0.388235, 0.145098, 0.941176, 0.0823529, 0.0392157, 0.0901961, 0.745098, 0.0235294, 0.580392, 0.968627, 0.470588, 0.917647, 0.294118, 0, 0.101961, 0.772549, 0.243137, 0.368627, 0.988235, 0.858824, 0.796078, 0.458824, 0.137255, 0.0431373, 0.12549, 0.223529, 0.694118, 0.129412, 0.345098, 0.929412, 0.584314, 0.219608, 0.341176, 0.682353, 0.0784314, 0.490196, 0.533333, 0.670588, 0.658824, 0.266667, 0.686275, 0.290196, 0.647059, 0.278431, 0.52549, 0.545098, 0.188235, 0.105882, 0.65098, 0.301961, 0.572549, 0.619608, 0.905882, 0.32549, 0.435294, 0.898039, 0.478431, 0.235294, 0.827451, 0.521569, 0.901961, 0.862745, 0.411765, 0.360784, 0.160784, 0.215686, 0.180392, 0.960784, 0.156863, 0.956863, 0.4, 0.560784, 0.211765, 0.254902, 0.0980392, 0.247059, 0.631373, 0.00392157, 0.847059, 0.313725, 0.286275, 0.819608, 0.298039, 0.517647, 0.733333, 0.815686, 0.34902, 0.0705882, 0.662745, 0.784314, 0.768627, 0.529412, 0.509804, 0.454902, 0.737255, 0.623529, 0.337255, 0.643137, 0.392157, 0.427451, 0.776471, 0.678431, 0.729412, 0.0117647, 0.25098, 0.203922, 0.85098, 0.886275, 0.980392, 0.486275, 0.482353, 0.0196078, 0.792157, 0.14902, 0.576471, 0.462745, 0.494118, 1, 0.321569, 0.333333, 0.831373, 0.811765, 0.807843, 0.231373, 0.890196, 0.184314, 0.0627451, 0.227451, 0.0666667, 0.713725, 0.741176, 0.109804, 0.164706, 0.87451, 0.717647, 0.666667, 0.835294, 0.466667, 0.972549, 0.596078, 0.00784314, 0.172549, 0.603922, 0.639216, 0.27451, 0.866667, 0.6, 0.396078, 0.607843, 0.654902, 0.168627, 0.67451, 0.0352941, 0.505882, 0.0862745, 0.152941, 0.992157, 0.0745098, 0.384314, 0.423529, 0.431373, 0.309804, 0.443137, 0.878431, 0.909804, 0.698039, 0.72549, 0.439216, 0.407843, 0.854902, 0.964706, 0.380392, 0.894118, 0.984314, 0.133333, 0.94902, 0.756863, 0.933333, 0.823529, 0.564706, 0.0470588, 0.74902, 0.701961, 0.635294, 0.945098, 0.317647, 0.2, 0.568627, 0.921569, 0.976471, 0.054902, 0.937255, 0.419608, 0.192157, 0.752941, 0.839216, 0.121569, 0.709804, 0.780392, 0.415686, 0.615686, 0.721569, 0.329412, 0.8, 0.690196, 0.45098, 0.47451, 0.196078, 0.176471, 0.498039, 0.0156863, 0.588235, 0.996078, 0.541176, 0.92549, 0.803922, 0.364706, 0.870588, 0.447059, 0.262745, 0.113725, 0.0941176, 0.282353, 0.952941, 0.552941, 0.501961, 0.764706, 0.305882, 0.258824, 0.843137, 0.239216, 0.611765, 0.705882];