{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# State of Mind\n",
    "\n",
    "The idea of \"state\" is a bit like \"state of mind\"... there is a variable that keeps track of what you are currently doing.\n",
    "\n",
    "## Old Joke\n",
    "\n",
    "This reminds me of an old joke that perhaps hits a bit close to home:\n",
    "\n",
    "A professor is walking down the hallway and is stopped by a student.\n",
    "\n",
    "She is interested in discussing a project with the professor over lunch. \"Have you had lunch yet?\" she asks the professor.\n",
    "\n",
    "\"I'm not sure... which way was I walking when you stopped me?\" the professor responds.\n",
    "\n",
    "# State\n",
    "\n",
    "The basic idea (and need) for state is driven because you are updating an object at many frames per second. That is, you are constantly calling methods like `object.draw()` and `object.move()` and you need to be able to move each object a bit in the manner that it currently desires.\n",
    "\n",
    "## Bouncing Balls\n",
    "\n",
    "We kept track of state with the bouncing ball examples by keeping track of their x, y positions and their velocities. But you can also keep track by using a name.\n",
    "\n",
    "## Moving People"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {
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    "format": "row"
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       "\n",
       "        var component = document.getElementById(\"sketch_4\");\n",
       "        if (component != undefined)\n",
       "            component.remove();\n",
       "        component = document.getElementById(\"state_4\");\n",
       "        if (component != undefined)\n",
       "            component.remove();\n",
       "        component = document.getElementById(\"controls_div_4\");\n",
       "        if (component != undefined)\n",
       "            component.remove();\n",
       "        require([window.location.protocol + \"//calysto.github.io/javascripts/processing/processing.js\"], function() {\n",
       "            // FIXME: Stop all previously running versions (?)\n",
       "            var processingInstance = Processing.getInstanceById(\"canvas_4\");\n",
       "            if (processingInstance != undefined && processingInstance.isRunning())\n",
       "                processingInstance.noLoop();\n",
       "        });\n",
       "\n",
       "\n",
       "        var output_area = this;\n",
       "        // find my cell element\n",
       "        var cell_element = output_area.element.parents('.cell');\n",
       "        // which cell is it?\n",
       "        var cell_idx = Jupyter.notebook.get_cell_elements().index(cell_element);\n",
       "        // get the cell object\n",
       "        var cell = Jupyter.notebook.get_cell(cell_idx);\n",
       "\n",
       "        function jyp_print(cell, newline) {\n",
       "            return function(message) {\n",
       "                cell.get_callbacks().iopub.output({header: {\"msg_type\": \"stream\"},\n",
       "                                                   content: {text: message + newline,\n",
       "                                                             name: \"stdout\"}});\n",
       "            }\n",
       "        }\n",
       "        window.jyp_println = jyp_print(cell, \"\\n\");\n",
       "        window.jyp_print = jyp_print(cell, \"\");\n",
       "\n",
       "        require([window.location.protocol + \"//calysto.github.io/javascripts/processing/processing.js\"], function() {\n",
       "           Processing.logger.println = jyp_print(cell, \"\\n\");\n",
       "           Processing.logger.print = jyp_print(cell, \"\");\n",
       "        });\n",
       "\n",
       "\n",
       "        "
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      "text/plain": [
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      "text/html": [
       "\n",
       "<div id=\"canvas_div_4\">\n",
       "  <b>Sketch #4:</b><br/>\n",
       "  <canvas id=\"canvas_4\"></canvas><br/>\n",
       "</div>\n",
       "<div id=\"controls_div_4\">\n",
       "  <button id=\"run_button_4\" onclick=\"startSketch('4');\">\n",
       "    <i class=\"fa fa-play-circle-o\" style=\"size: 2em;\"></i>\n",
       "        Run\n",
       "  </button>\n",
       "  <button id=\"pause_button_4\" onclick=\"pauseSketch('4');\">\n",
       "    <i class=\"fa fa-pause\" style=\"size: 2em;\"></i>\n",
       "        Pause\n",
       "  </button>\n",
       "  <button id=\"setup_button_4\" onclick=\"setupSketch('4');\">\n",
       "    setup()\n",
       "  </button>\n",
       "  <button id=\"draw_button_4\" onclick=\"drawSketch('4');\">\n",
       "    draw()\n",
       "  </button>\n",
       "</div>\n",
       "<b>Sketch #4 state:</b> <span id=\"state_4\">Loading...</span><br/>\n",
       "<script>\n",
       "\n",
       "function change_button(button, disable) {\n",
       "    button.disabled = disable;\n",
       "    if (disable) {\n",
       "        button.style.color = \"grey\";\n",
       "    } else {\n",
       "        button.style.color = \"black\";\n",
       "    }\n",
       "}\n",
       "\n",
       "function startSketch(id) {\n",
       "    switchSketchState(id, true);\n",
       "}\n",
       "\n",
       "function pauseSketch(id) {\n",
       "    switchSketchState(id, false);\n",
       "}\n",
       "\n",
       "function drawSketch(id) {\n",
       "    var processingInstance = Processing.getInstanceById(\"canvas_\" + id);\n",
       "    if (processingInstance != undefined) {\n",
       "        if (processingInstance.draw != undefined) {\n",
       "            document.getElementById(\"state_\" + id).innerHTML = \"Drawing...\";\n",
       "            try {\n",
       "                processingInstance.redraw();\n",
       "                document.getElementById(\"state_\" + id).innerHTML = \"Drawing... done! Paused.\";\n",
       "                document.getElementById(\"state_\" + id).style.color = \"blue\";\n",
       "            } catch (e) {\n",
       "                processingInstance.println(e.toString());\n",
       "                document.getElementById(\"state_\" + id).innerHTML = e.toString();\n",
       "                document.getElementById(\"state_\" + id).style.color = \"red\";\n",
       "            }\n",
       "        } else {\n",
       "            document.getElementById(\"state_\" + id).innerHTML = \"No drawing() function. Paused.\";\n",
       "            document.getElementById(\"state_\" + id).style.color = \"blue\";\n",
       "        }\n",
       "    } else {\n",
       "        document.getElementById(\"state_\" + id).innerHTML = \"Error.\";\n",
       "        document.getElementById(\"state_\" + id).style.color = \"red\";\n",
       "    }\n",
       "    change_button(document.getElementById(\"run_button_\" + id), processingInstance.draw == undefined);\n",
       "    change_button(document.getElementById(\"pause_button_\" + id), true);\n",
       "    change_button(document.getElementById(\"setup_button_\" + id), processingInstance.setup == undefined);\n",
       "    change_button(document.getElementById(\"draw_button_\" + id), processingInstance.draw == undefined);\n",
       "}\n",
       "\n",
       "function setupSketch(id) {\n",
       "    var processingInstance = Processing.getInstanceById(\"canvas_\" + id);\n",
       "    if (processingInstance != undefined) {\n",
       "        if (processingInstance.setup != undefined) {\n",
       "            document.getElementById(\"state_\" + id).innerHTML = \"Setting up...\";\n",
       "            try {\n",
       "                processingInstance.setup();\n",
       "                document.getElementById(\"state_\" + id).innerHTML = \"Setting up... done! Paused.\";\n",
       "                document.getElementById(\"state_\" + id).style.color = \"blue\";\n",
       "            } catch (e) {\n",
       "                processingInstance.println(e.toString());\n",
       "                document.getElementById(\"state_\" + id).innerHTML = e.toString();\n",
       "                document.getElementById(\"state_\" + id).style.color = \"red\";\n",
       "            }\n",
       "        } else {\n",
       "            document.getElementById(\"state_\" + id).innerHTML = \"No setup() function. Paused.\";\n",
       "            document.getElementById(\"state_\" + id).style.color = \"blue\";\n",
       "        }\n",
       "    } else {\n",
       "        document.getElementById(\"state_\" + id).innerHTML = \"Error.\";\n",
       "        document.getElementById(\"state_\" + id).style.color = \"red\";\n",
       "    }\n",
       "    change_button(document.getElementById(\"run_button_\" + id), processingInstance.draw == undefined);\n",
       "    change_button(document.getElementById(\"pause_button_\" + id), true);\n",
       "    change_button(document.getElementById(\"setup_button_\" + id), processingInstance.setup == undefined);\n",
       "    change_button(document.getElementById(\"draw_button_\" + id), processingInstance.draw == undefined);\n",
       "}\n",
       "\n",
       "function switchSketchState(id, on) {\n",
       "    var processingInstance = Processing.getInstanceById(\"canvas_\" + id);\n",
       "    if (on) {\n",
       "        document.getElementById(\"state_\" + id).innerHTML = \"Running...\";\n",
       "        document.getElementById(\"state_\" + id).style.color = \"green\";\n",
       "        change_button(document.getElementById(\"run_button_\" + id), true);\n",
       "        change_button(document.getElementById(\"pause_button_\" + id), processingInstance.draw == undefined);\n",
       "        change_button(document.getElementById(\"setup_button_\" + id),  true);\n",
       "        change_button(document.getElementById(\"draw_button_\" + id), true);\n",
       "        processingInstance.loop();  // call Processing loop() function\n",
       "    } else {\n",
       "        document.getElementById(\"state_\" + id).innerHTML = \"Paused.\";\n",
       "        document.getElementById(\"state_\" + id).style.color = \"blue\";\n",
       "        change_button(document.getElementById(\"run_button_\" + id), processingInstance.draw == undefined);\n",
       "        change_button(document.getElementById(\"pause_button_\" + id), true);\n",
       "        change_button(document.getElementById(\"setup_button_\" + id), processingInstance.setup == undefined);\n",
       "        change_button(document.getElementById(\"draw_button_\" + id), processingInstance.draw == undefined);\n",
       "        processingInstance.noLoop(); // stop animation, call noLoop()\n",
       "    }\n",
       "}\n",
       "\n",
       "require([window.location.protocol + \"//calysto.github.io/javascripts/processing/processing.js\"], function () {\n",
       "    var processingCode = 'class Person {\\n    int x;\\n    int y;\\n    String state;\\n    int speed;\\n    color mycolor;\\n    \\n    Person(int x, int y, String state) {\\n        this.x = x;\\n        this.y = y;\\n        this.state = state;\\n        this.speed = 1 + int(random(2));\\n        this.mycolor = color(random(255), random(255), random(255));\\n    }\\n    \\n    void draw() {\\n        fill(this.mycolor);\\n        if (state.equals(\"to right\")) {\\n            ellipse(this.x + 5, this.y - 5, 5, 5);\\n        } else { // \"to left\"\\n            ellipse(this.x, this.y - 5, 5, 5);\\n        }\\n        rect(this.x, this.y, 5, 10);\\n    }\\n    \\n    void move() {\\n        // Change state if necessary:\\n        if (this.x > width) {\\n            state = \"to left\";\\n        } else if (this.x < 0) {\\n            state = \"to right\";            \\n        }\\n        \\n        // Update position based on state:\\n        if (state.equals(\"to right\")) {\\n            this.x += this.speed;\\n        } else if (state.equals(\"to left\")) {\\n            this.x -= this.speed;\\n        }\\n    }\\n}\\n\\nPerson[] people = new Person[10];\\n\\nvoid setup() {\\n    size(500, 100);\\n    for (int i=0; i<people.length; i++) {\\n        people[i] = new Person(int(random(width)), int(random(height)), \"to right\");\\n    }\\n}\\n\\nvoid draw() {\\n    background(color(255, 128, 0));\\n    for (int i=0; i<people.length; i++) {\\n        people[i].move();\\n        people[i].draw();\\n    }    \\n}';\n",
       "    var cc;\n",
       "    var processingInstance;\n",
       "    var has_error = false;\n",
       "\n",
       "    try {\n",
       "        cc = Processing.compile(processingCode);\n",
       "    } catch (e) {\n",
       "        console.log(e);\n",
       "        cc = Processing.compile(\"println('\" + e.toString() + \"');\");\n",
       "        document.getElementById(\"state_4\").innerHTML = e.toString();\n",
       "        document.getElementById(\"state_4\").style.color = \"red\";\n",
       "        has_error = true;\n",
       "    }\n",
       "    if (cc != undefined) {\n",
       "        try {\n",
       "            processingInstance = new Processing(\"canvas_4\", cc);\n",
       "            processingInstance.println = window.jyp_println\n",
       "        } catch (e) {\n",
       "            console.log(e);\n",
       "            cc = Processing.compile(\"println('\" + e.toString() + \"');\");\n",
       "            document.getElementById(\"state_4\").innerHTML = e.toString();\n",
       "            document.getElementById(\"state_4\").style.color = \"red\";\n",
       "            processingInstance = new Processing(\"canvas_4\", cc);\n",
       "            processingInstance.println = window.jyp_println\n",
       "            has_error = true;\n",
       "        }\n",
       "    }\n",
       "    if (processingInstance != undefined) {\n",
       "        setTimeout(function () {\n",
       "            // Canvas:\n",
       "            if (processingInstance.externals.context === undefined) {\n",
       "                document.getElementById(\"canvas_div_4\").style.display = \"none\";\n",
       "            }\n",
       "        }, 100);\n",
       "        // Controls:\n",
       "        if (!(processingInstance.isRunning() && processingInstance.draw != undefined)) {\n",
       "            document.getElementById(\"controls_div_4\").style.display = \"none\";\n",
       "        }\n",
       "        if (processingInstance.draw != undefined) {\n",
       "            if (!has_error) {\n",
       "                document.getElementById(\"state_4\").innerHTML = \"Running...\";\n",
       "                document.getElementById(\"state_4\").style.color = \"green\";\n",
       "            }\n",
       "            change_button(document.getElementById(\"run_button_4\"), true);\n",
       "            change_button(document.getElementById(\"pause_button_4\"), false);\n",
       "            change_button(document.getElementById(\"setup_button_4\"),  true);\n",
       "            change_button(document.getElementById(\"draw_button_4\"), true);\n",
       "        } else {\n",
       "            if (!has_error) {\n",
       "                document.getElementById(\"state_4\").innerHTML = \"Done.\";\n",
       "                document.getElementById(\"state_4\").style.color = \"blue\";\n",
       "            }\n",
       "            change_button(document.getElementById(\"run_button_4\"), true);\n",
       "            change_button(document.getElementById(\"pause_button_4\"), true);\n",
       "            change_button(document.getElementById(\"setup_button_4\"),  processingInstance.setup == undefined);\n",
       "            change_button(document.getElementById(\"draw_button_4\"), true);\n",
       "        }\n",
       "    } else {\n",
       "        document.getElementById(\"canvas_div_4\").style.display = \"none\";\n",
       "        document.getElementById(\"controls_div_4\").style.display = \"none\";\n",
       "        if (!has_error) {\n",
       "            document.getElementById(\"state_4\").innerHTML = \"Error.\";\n",
       "            document.getElementById(\"state_4\").style.color = \"red\";\n",
       "        }\n",
       "        change_button(document.getElementById(\"run_button_4\"), true);\n",
       "        change_button(document.getElementById(\"pause_button_4\"), true);\n",
       "        change_button(document.getElementById(\"setup_button_4\"),  true);\n",
       "        change_button(document.getElementById(\"draw_button_4\"), true);\n",
       "    }\n",
       "});\n",
       "\n",
       "</script>\n"
      ],
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       "<IPython.core.display.HTML object>"
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     "output_type": "display_data"
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   "source": [
    "class Person {\n",
    "    int x;\n",
    "    int y;\n",
    "    String state;\n",
    "    int speed;\n",
    "    color mycolor;\n",
    "    \n",
    "    Person(int x, int y, String state) {\n",
    "        this.x = x;\n",
    "        this.y = y;\n",
    "        this.state = state;\n",
    "        this.speed = 1 + int(random(2));\n",
    "        this.mycolor = color(random(255), random(255), random(255));\n",
    "    }\n",
    "    \n",
    "    void draw() {\n",
    "        fill(this.mycolor);\n",
    "        if (state.equals(\"to right\")) {\n",
    "            ellipse(this.x + 5, this.y - 5, 5, 5);\n",
    "        } else { // \"to left\"\n",
    "            ellipse(this.x, this.y - 5, 5, 5);\n",
    "        }\n",
    "        rect(this.x, this.y, 5, 10);\n",
    "    }\n",
    "    \n",
    "    void move() {\n",
    "        // Change state if necessary:\n",
    "        if (this.x > width) {\n",
    "            state = \"to left\";\n",
    "        } else if (this.x < 0) {\n",
    "            state = \"to right\";            \n",
    "        }\n",
    "        \n",
    "        // Update position based on state:\n",
    "        if (state.equals(\"to right\")) {\n",
    "            this.x += this.speed;\n",
    "        } else if (state.equals(\"to left\")) {\n",
    "            this.x -= this.speed;\n",
    "        }\n",
    "    }\n",
    "}\n",
    "\n",
    "Person[] people = new Person[10];\n",
    "\n",
    "void setup() {\n",
    "    size(500, 100);\n",
    "    for (int i=0; i<people.length; i++) {\n",
    "        people[i] = new Person(int(random(width)), int(random(height)), \"to right\");\n",
    "    }\n",
    "}\n",
    "\n",
    "void draw() {\n",
    "    background(color(255, 128, 0));\n",
    "    for (int i=0; i<people.length; i++) {\n",
    "        people[i].move();\n",
    "        people[i].draw();\n",
    "    }    \n",
    "}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Sidebar: Breaking up code based on classes\n",
    "\n",
    "Using Jupyter, you can create a file (in this case called \"Person.java\") by using the %%file magic:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Created file '/home/dblank/public_html/CS110 Intro to Computing/2017-Spring/Lectures/Person.java'.\n"
     ]
    }
   ],
   "source": [
    "%%file Person.java\n",
    "\n",
    "class Person {\n",
    "    int x;\n",
    "    int y;\n",
    "    String state;\n",
    "    int time;\n",
    "    \n",
    "    Person(int x, int y, String state) {\n",
    "        this.x = x;\n",
    "        this.y = y;\n",
    "        this.state = state;\n",
    "        this.time = 0;\n",
    "    }\n",
    "    \n",
    "    void draw() {\n",
    "        if ((this.time % 20) < 10) {\n",
    "            rect(this.x, this.y, 5, 10);\n",
    "        } else {\n",
    "            rect(this.x, this.y - 5, 5, 10);\n",
    "        }\n",
    "    }\n",
    "    \n",
    "    void move() {\n",
    "        this.time += 1;\n",
    "        // Change state if necessary:\n",
    "        if (this.x > width) {\n",
    "            state = \"to left\";\n",
    "        } else if (this.x < 0) {\n",
    "            state = \"to right\";            \n",
    "        }\n",
    "        \n",
    "        // Update position based on state:\n",
    "        if (state.equals(\"to right\")) {\n",
    "            this.x += 1;\n",
    "        } else if (state.equals(\"to left\")) {\n",
    "            this.x -= 1;\n",
    "        }\n",
    "    }\n",
    "}"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "You can then use that file by %including it in a Processing sketch:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
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      "application/javascript": [
       "\n",
       "        var component = document.getElementById(\"sketch_5\");\n",
       "        if (component != undefined)\n",
       "            component.remove();\n",
       "        component = document.getElementById(\"state_5\");\n",
       "        if (component != undefined)\n",
       "            component.remove();\n",
       "        component = document.getElementById(\"controls_div_5\");\n",
       "        if (component != undefined)\n",
       "            component.remove();\n",
       "        require([window.location.protocol + \"//calysto.github.io/javascripts/processing/processing.js\"], function() {\n",
       "            // FIXME: Stop all previously running versions (?)\n",
       "            var processingInstance = Processing.getInstanceById(\"canvas_5\");\n",
       "            if (processingInstance != undefined && processingInstance.isRunning())\n",
       "                processingInstance.noLoop();\n",
       "        });\n",
       "\n",
       "\n",
       "        var output_area = this;\n",
       "        // find my cell element\n",
       "        var cell_element = output_area.element.parents('.cell');\n",
       "        // which cell is it?\n",
       "        var cell_idx = Jupyter.notebook.get_cell_elements().index(cell_element);\n",
       "        // get the cell object\n",
       "        var cell = Jupyter.notebook.get_cell(cell_idx);\n",
       "\n",
       "        function jyp_print(cell, newline) {\n",
       "            return function(message) {\n",
       "                cell.get_callbacks().iopub.output({header: {\"msg_type\": \"stream\"},\n",
       "                                                   content: {text: message + newline,\n",
       "                                                             name: \"stdout\"}});\n",
       "            }\n",
       "        }\n",
       "        window.jyp_println = jyp_print(cell, \"\\n\");\n",
       "        window.jyp_print = jyp_print(cell, \"\");\n",
       "\n",
       "        require([window.location.protocol + \"//calysto.github.io/javascripts/processing/processing.js\"], function() {\n",
       "           Processing.logger.println = jyp_print(cell, \"\\n\");\n",
       "           Processing.logger.print = jyp_print(cell, \"\");\n",
       "        });\n",
       "\n",
       "\n",
       "        "
      ],
      "text/plain": [
       "<IPython.core.display.Javascript object>"
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     "output_type": "display_data"
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     "data": {
      "text/html": [
       "\n",
       "<div id=\"canvas_div_5\">\n",
       "  <b>Sketch #5:</b><br/>\n",
       "  <canvas id=\"canvas_5\"></canvas><br/>\n",
       "</div>\n",
       "<div id=\"controls_div_5\">\n",
       "  <button id=\"run_button_5\" onclick=\"startSketch('5');\">\n",
       "    <i class=\"fa fa-play-circle-o\" style=\"size: 2em;\"></i>\n",
       "        Run\n",
       "  </button>\n",
       "  <button id=\"pause_button_5\" onclick=\"pauseSketch('5');\">\n",
       "    <i class=\"fa fa-pause\" style=\"size: 2em;\"></i>\n",
       "        Pause\n",
       "  </button>\n",
       "  <button id=\"setup_button_5\" onclick=\"setupSketch('5');\">\n",
       "    setup()\n",
       "  </button>\n",
       "  <button id=\"draw_button_5\" onclick=\"drawSketch('5');\">\n",
       "    draw()\n",
       "  </button>\n",
       "</div>\n",
       "<b>Sketch #5 state:</b> <span id=\"state_5\">Loading...</span><br/>\n",
       "<script>\n",
       "\n",
       "function change_button(button, disable) {\n",
       "    button.disabled = disable;\n",
       "    if (disable) {\n",
       "        button.style.color = \"grey\";\n",
       "    } else {\n",
       "        button.style.color = \"black\";\n",
       "    }\n",
       "}\n",
       "\n",
       "function startSketch(id) {\n",
       "    switchSketchState(id, true);\n",
       "}\n",
       "\n",
       "function pauseSketch(id) {\n",
       "    switchSketchState(id, false);\n",
       "}\n",
       "\n",
       "function drawSketch(id) {\n",
       "    var processingInstance = Processing.getInstanceById(\"canvas_\" + id);\n",
       "    if (processingInstance != undefined) {\n",
       "        if (processingInstance.draw != undefined) {\n",
       "            document.getElementById(\"state_\" + id).innerHTML = \"Drawing...\";\n",
       "            try {\n",
       "                processingInstance.redraw();\n",
       "                document.getElementById(\"state_\" + id).innerHTML = \"Drawing... done! Paused.\";\n",
       "                document.getElementById(\"state_\" + id).style.color = \"blue\";\n",
       "            } catch (e) {\n",
       "                processingInstance.println(e.toString());\n",
       "                document.getElementById(\"state_\" + id).innerHTML = e.toString();\n",
       "                document.getElementById(\"state_\" + id).style.color = \"red\";\n",
       "            }\n",
       "        } else {\n",
       "            document.getElementById(\"state_\" + id).innerHTML = \"No drawing() function. Paused.\";\n",
       "            document.getElementById(\"state_\" + id).style.color = \"blue\";\n",
       "        }\n",
       "    } else {\n",
       "        document.getElementById(\"state_\" + id).innerHTML = \"Error.\";\n",
       "        document.getElementById(\"state_\" + id).style.color = \"red\";\n",
       "    }\n",
       "    change_button(document.getElementById(\"run_button_\" + id), processingInstance.draw == undefined);\n",
       "    change_button(document.getElementById(\"pause_button_\" + id), true);\n",
       "    change_button(document.getElementById(\"setup_button_\" + id), processingInstance.setup == undefined);\n",
       "    change_button(document.getElementById(\"draw_button_\" + id), processingInstance.draw == undefined);\n",
       "}\n",
       "\n",
       "function setupSketch(id) {\n",
       "    var processingInstance = Processing.getInstanceById(\"canvas_\" + id);\n",
       "    if (processingInstance != undefined) {\n",
       "        if (processingInstance.setup != undefined) {\n",
       "            document.getElementById(\"state_\" + id).innerHTML = \"Setting up...\";\n",
       "            try {\n",
       "                processingInstance.setup();\n",
       "                document.getElementById(\"state_\" + id).innerHTML = \"Setting up... done! Paused.\";\n",
       "                document.getElementById(\"state_\" + id).style.color = \"blue\";\n",
       "            } catch (e) {\n",
       "                processingInstance.println(e.toString());\n",
       "                document.getElementById(\"state_\" + id).innerHTML = e.toString();\n",
       "                document.getElementById(\"state_\" + id).style.color = \"red\";\n",
       "            }\n",
       "        } else {\n",
       "            document.getElementById(\"state_\" + id).innerHTML = \"No setup() function. Paused.\";\n",
       "            document.getElementById(\"state_\" + id).style.color = \"blue\";\n",
       "        }\n",
       "    } else {\n",
       "        document.getElementById(\"state_\" + id).innerHTML = \"Error.\";\n",
       "        document.getElementById(\"state_\" + id).style.color = \"red\";\n",
       "    }\n",
       "    change_button(document.getElementById(\"run_button_\" + id), processingInstance.draw == undefined);\n",
       "    change_button(document.getElementById(\"pause_button_\" + id), true);\n",
       "    change_button(document.getElementById(\"setup_button_\" + id), processingInstance.setup == undefined);\n",
       "    change_button(document.getElementById(\"draw_button_\" + id), processingInstance.draw == undefined);\n",
       "}\n",
       "\n",
       "function switchSketchState(id, on) {\n",
       "    var processingInstance = Processing.getInstanceById(\"canvas_\" + id);\n",
       "    if (on) {\n",
       "        document.getElementById(\"state_\" + id).innerHTML = \"Running...\";\n",
       "        document.getElementById(\"state_\" + id).style.color = \"green\";\n",
       "        change_button(document.getElementById(\"run_button_\" + id), true);\n",
       "        change_button(document.getElementById(\"pause_button_\" + id), processingInstance.draw == undefined);\n",
       "        change_button(document.getElementById(\"setup_button_\" + id),  true);\n",
       "        change_button(document.getElementById(\"draw_button_\" + id), true);\n",
       "        processingInstance.loop();  // call Processing loop() function\n",
       "    } else {\n",
       "        document.getElementById(\"state_\" + id).innerHTML = \"Paused.\";\n",
       "        document.getElementById(\"state_\" + id).style.color = \"blue\";\n",
       "        change_button(document.getElementById(\"run_button_\" + id), processingInstance.draw == undefined);\n",
       "        change_button(document.getElementById(\"pause_button_\" + id), true);\n",
       "        change_button(document.getElementById(\"setup_button_\" + id), processingInstance.setup == undefined);\n",
       "        change_button(document.getElementById(\"draw_button_\" + id), processingInstance.draw == undefined);\n",
       "        processingInstance.noLoop(); // stop animation, call noLoop()\n",
       "    }\n",
       "}\n",
       "\n",
       "require([window.location.protocol + \"//calysto.github.io/javascripts/processing/processing.js\"], function () {\n",
       "    var processingCode = '\\nclass Person {\\n    int x;\\n    int y;\\n    String state;\\n    int time;\\n    \\n    Person(int x, int y, String state) {\\n        this.x = x;\\n        this.y = y;\\n        this.state = state;\\n        this.time = 0;\\n    }\\n    \\n    void draw() {\\n        if ((this.time % 20) < 10) {\\n            rect(this.x, this.y, 5, 10);\\n        } else {\\n            rect(this.x, this.y - 5, 5, 10);\\n        }\\n    }\\n    \\n    void move() {\\n        this.time += 1;\\n        // Change state if necessary:\\n        if (this.x > width) {\\n            state = \"to left\";\\n        } else if (this.x < 0) {\\n            state = \"to right\";            \\n        }\\n        \\n        // Update position based on state:\\n        if (state.equals(\"to right\")) {\\n            this.x += 1;\\n        } else if (state.equals(\"to left\")) {\\n            this.x -= 1;\\n        }\\n    }\\n}\\n\\nPerson[] people = new Person[10];\\n\\nvoid setup() {\\n    for (int i=0; i<people.length; i++) {\\n        people[i] = new Person(int(random(width)), int(random(height)), \"to right\");\\n    }\\n}\\n\\nvoid draw() {\\n    background(color(255, 128, 0));\\n    for (int i=0; i<people.length; i++) {\\n        people[i].move();\\n        people[i].draw();\\n    }    \\n}';\n",
       "    var cc;\n",
       "    var processingInstance;\n",
       "    var has_error = false;\n",
       "\n",
       "    try {\n",
       "        cc = Processing.compile(processingCode);\n",
       "    } catch (e) {\n",
       "        console.log(e);\n",
       "        cc = Processing.compile(\"println('\" + e.toString() + \"');\");\n",
       "        document.getElementById(\"state_5\").innerHTML = e.toString();\n",
       "        document.getElementById(\"state_5\").style.color = \"red\";\n",
       "        has_error = true;\n",
       "    }\n",
       "    if (cc != undefined) {\n",
       "        try {\n",
       "            processingInstance = new Processing(\"canvas_5\", cc);\n",
       "            processingInstance.println = window.jyp_println\n",
       "        } catch (e) {\n",
       "            console.log(e);\n",
       "            cc = Processing.compile(\"println('\" + e.toString() + \"');\");\n",
       "            document.getElementById(\"state_5\").innerHTML = e.toString();\n",
       "            document.getElementById(\"state_5\").style.color = \"red\";\n",
       "            processingInstance = new Processing(\"canvas_5\", cc);\n",
       "            processingInstance.println = window.jyp_println\n",
       "            has_error = true;\n",
       "        }\n",
       "    }\n",
       "    if (processingInstance != undefined) {\n",
       "        setTimeout(function () {\n",
       "            // Canvas:\n",
       "            if (processingInstance.externals.context === undefined) {\n",
       "                document.getElementById(\"canvas_div_5\").style.display = \"none\";\n",
       "            }\n",
       "        }, 100);\n",
       "        // Controls:\n",
       "        if (!(processingInstance.isRunning() && processingInstance.draw != undefined)) {\n",
       "            document.getElementById(\"controls_div_5\").style.display = \"none\";\n",
       "        }\n",
       "        if (processingInstance.draw != undefined) {\n",
       "            if (!has_error) {\n",
       "                document.getElementById(\"state_5\").innerHTML = \"Running...\";\n",
       "                document.getElementById(\"state_5\").style.color = \"green\";\n",
       "            }\n",
       "            change_button(document.getElementById(\"run_button_5\"), true);\n",
       "            change_button(document.getElementById(\"pause_button_5\"), false);\n",
       "            change_button(document.getElementById(\"setup_button_5\"),  true);\n",
       "            change_button(document.getElementById(\"draw_button_5\"), true);\n",
       "        } else {\n",
       "            if (!has_error) {\n",
       "                document.getElementById(\"state_5\").innerHTML = \"Done.\";\n",
       "                document.getElementById(\"state_5\").style.color = \"blue\";\n",
       "            }\n",
       "            change_button(document.getElementById(\"run_button_5\"), true);\n",
       "            change_button(document.getElementById(\"pause_button_5\"), true);\n",
       "            change_button(document.getElementById(\"setup_button_5\"),  processingInstance.setup == undefined);\n",
       "            change_button(document.getElementById(\"draw_button_5\"), true);\n",
       "        }\n",
       "    } else {\n",
       "        document.getElementById(\"canvas_div_5\").style.display = \"none\";\n",
       "        document.getElementById(\"controls_div_5\").style.display = \"none\";\n",
       "        if (!has_error) {\n",
       "            document.getElementById(\"state_5\").innerHTML = \"Error.\";\n",
       "            document.getElementById(\"state_5\").style.color = \"red\";\n",
       "        }\n",
       "        change_button(document.getElementById(\"run_button_5\"), true);\n",
       "        change_button(document.getElementById(\"pause_button_5\"), true);\n",
       "        change_button(document.getElementById(\"setup_button_5\"),  true);\n",
       "        change_button(document.getElementById(\"draw_button_5\"), true);\n",
       "    }\n",
       "});\n",
       "\n",
       "</script>\n"
      ],
      "text/plain": [
       "<IPython.core.display.HTML object>"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "%include Person.java\n",
    "\n",
    "Person[] people = new Person[10];\n",
    "\n",
    "void setup() {\n",
    "    for (int i=0; i<people.length; i++) {\n",
    "        people[i] = new Person(int(random(width)), int(random(height)), \"to right\");\n",
    "    }\n",
    "}\n",
    "\n",
    "void draw() {\n",
    "    background(color(255, 128, 0));\n",
    "    for (int i=0; i<people.length; i++) {\n",
    "        people[i].move();\n",
    "        people[i].draw();\n",
    "    }    \n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Calysto Processing",
   "language": "java",
   "name": "calysto_processing"
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  "language_info": {
   "codemirror_mode": {
    "name": "text/x-java",
    "version": 2
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   "file_extension": ".java",
   "mimetype": "text/x-java",
   "name": "java"
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