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;; This code is from the following blog post: | |
;; Building a simple Clojure web application with Incanter, Compojure, and Leiningen | |
;; http://incanter-blog.org/2009/11/29/incanter-webapp/ | |
(ns simple_web_app | |
(:gen-class) | |
(:use [compojure] | |
[compojure.http response] | |
[incanter core stats charts]) | |
(:import (java.io ByteArrayOutputStream | |
ByteArrayInputStream))) | |
;; Pass a map as the first argument to be | |
;; set as attributes of the element | |
(defn html-doc | |
[title & body] | |
(html | |
(doctype :html4) | |
[:html | |
[:head | |
[:title title]] | |
[:body | |
[:div | |
[:h2 | |
[:a {:href "/"} | |
"Generate a normal sample"]]] | |
body]])) | |
(def sample-form | |
(html-doc "sample-normal histogram" | |
(form-to [:get "/sample-normal"] | |
"sample size: " (text-field {:size 4} :size) | |
"mean: " (text-field {:size 4} :mean) | |
"sd: " (text-field {:size 4} :sd) | |
(submit-button "view")))) | |
(defn gen-samp-hist-png | |
[request size-str mean-str sd-str] | |
(let [size (if (nil? size-str) | |
1000 | |
(Integer/parseInt size-str)) | |
m (if (nil? mean-str) | |
0 | |
(Double/parseDouble mean-str)) | |
s (if (nil? sd-str) | |
1 | |
(Double/parseDouble sd-str)) | |
samp (sample-normal size | |
:mean m | |
:sd s) | |
chart (histogram | |
samp | |
:title "Normal Sample" | |
:x-label (str "sample-size = " size | |
", mean = " m | |
", sd = " s)) | |
out-stream (ByteArrayOutputStream.) | |
in-stream (do | |
(save chart out-stream) | |
(ByteArrayInputStream. | |
(.toByteArray out-stream))) | |
header {:status 200 | |
:headers {"Content-Type" "image/png"}}] | |
(update-response request | |
header | |
in-stream))) | |
;; define routes | |
(defroutes webservice | |
(GET "/" | |
sample-form) | |
(GET "/sample-normal" | |
(gen-samp-hist-png request | |
(params :size) | |
(params :mean) | |
(params :sd)))) | |
;; define main function that starts webserver | |
(defn -main [& args] | |
(run-server {:port 8080} | |
"/*" (servlet webservice))) | |
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