feat: Create geogebra applet and implement some Joyce commands (#5)

Reviewed-on: #5
Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Co-committed-by: Glen Whitney <glen@studioinfinity.org>

public/inscribed-modified.html

@@ -15,7 +15,7 @@
 <table class="centered">
 <tr><td align="center">
 <applet code="Geometry" archive="Geometry.zip" width="410" height="370">
-<param name="background" value="ffffff">
+<param name="background" value="ffffdd">
 <param name="title" value="An equilateral triangle inscribed in a rectangle">
 
 <!-- the moving mechanism -->

src/adapptlet.civet

@@ -1,2 +1,87 @@
-import https://code.jquery.com/jquery-3.7.1.slim.js
-$('body').append '<div id="helloDiv">Hello World</div>'
+import https://code.jquery.com/jquery-3.7.1.js
+
+joyceApplets := []
+$('applet[code="Geometry"]').before (i, html) ->
+   id := `joyceApplet${i}`
+   joyceApplets.push { html, this.children, id,
+      width: parseInt(this.getAttribute 'width'),
+      height: parseInt(this.getAttribute 'height') }
+   `<div id="${id}"></div>`
+
+jQuery.getScript 'https://www.geogebra.org/apps/deployggb.js', =>
+   for each jApp of joyceApplets
+      params := {
+         appName: 'classic',
+         jApp.width,
+         jApp.height,
+         appletOnLoad: (api) =>
+            for child of jApp.children
+               dispatchJcommand api, child
+            api.setCoordSystem(-10, 10 + jApp.width, -10, 10 + jApp.height)
+         }
+      geoApp := new GGBApplet params
+      geoApp.inject jApp.id
+
+type Cmdr
+  command: string
+  callbacks: ((api) => boolean)[]
+
+function dispatchJcommand(api, param)
+   val := param.getAttribute 'value'
+   switch param.getAttribute 'name'
+      'background'
+         api.setGraphicsOptions 1, bgColor: `#${val}`
+      'title'
+         api.evalCommand `TitlePoint = Corner(1,1)
+            Text("${val}", TitlePoint + (2,5))`
+      /e\[\d+\]/
+         {command, callbacks} := jToG val
+         if command
+            if api.evalCommand command
+               for each cb of callbacks
+                  cb(api)
+            else
+               console.log `Geogebra command '${command}' translated from`,
+                  val, 'failed.'
+         else
+            console.log `Unknown command '${val}'`
+      else
+         console.log `Unkown param ${param}`
+
+function jToG(jCom: string): Cmdr
+   [name, klass, method, data, ...colors] := jCom.split(';')
+   if klass in classHandler
+      return classHandler[klass] name, method, data, colors
+   console.log `Unknown entity class ${klass}`
+   return ''
+
+classHandler :=
+   point: (name: string, m: string, data: string, colors: string[]): Cmdr =>
+      command .= ''
+      callbacks .= []
+      switch m
+         /free|fixed/
+            command += `${name} = (${data})`
+            if m is 'fixed'
+               callbacks.push (api) => api.setFixed(name, true)
+         'perpendicular'
+            [center, direction] := data.split(',')
+            command += `${name} = Rotate(${direction}, 3*pi/2, ${center})`
+      return {command, callbacks}
+
+   line: (name: string, m: string, data: string, colors: string[]): Cmdr =>
+      command .= ''
+      callbacks .= []
+      switch m
+         'connect'
+            command += `${name} = Segment(${data})`
+      return {command, callbacks}
+
+   circle: (name: string, m: string, data: string, colors: string[]): Cmdr =>
+      command .= ''
+      callbacks .= []
+      switch m
+         'radius'
+            [center, point] := data.split(',')
+            command += `${name} = Circle(${center}, ${point})`
+      return {command, callbacks}