{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Image Functions 2\n",
    "\n",
    "To work with images in Jupyter Processing, you need to do three things:\n",
    "\n",
    "1. Upload your images to the same folder where your notebook is\n",
    "1. List the images in a @pjs comment (see below)\n",
    "3. use loadImage() to load the image into Processing"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "application/javascript": [
       "\n",
       "        var component = document.getElementById(\"sketch_1\");\n",
       "        if (component != undefined)\n",
       "            component.remove();\n",
       "        component = document.getElementById(\"state_1\");\n",
       "        if (component != undefined)\n",
       "            component.remove();\n",
       "        component = document.getElementById(\"controls_div_1\");\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_1\");\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>"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/html": [
       "\n",
       "<div id=\"canvas_div_1\">\n",
       "  <b>Sketch #1:</b><br/>\n",
       "  <canvas id=\"canvas_1\"></canvas><br/>\n",
       "</div>\n",
       "<div id=\"controls_div_1\">\n",
       "  <button id=\"run_button_1\" onclick=\"startSketch('1');\">\n",
       "    <i class=\"fa fa-play-circle-o\" style=\"size: 2em;\"></i>\n",
       "        Run\n",
       "  </button>\n",
       "  <button id=\"pause_button_1\" onclick=\"pauseSketch('1');\">\n",
       "    <i class=\"fa fa-pause\" style=\"size: 2em;\"></i>\n",
       "        Pause\n",
       "  </button>\n",
       "  <button id=\"setup_button_1\" onclick=\"setupSketch('1');\">\n",
       "    setup()\n",
       "  </button>\n",
       "  <button id=\"draw_button_1\" onclick=\"drawSketch('1');\">\n",
       "    draw()\n",
       "  </button>\n",
       "</div>\n",
       "<b>Sketch #1 state:</b> <span id=\"state_1\">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 = '/* @pjs preload=\"pic3.jpg,tornadovolcano.jpg\"; */\\n\\nPImage img;\\nPImage bimg;\\n\\nvoid setup() {\\n    int guess = 13;\\n    img = loadImage(\"pic3.jpg\");\\n    bimg = loadImage(\"tornadovolcano.jpg\");\\n    img.resize(600, 400);\\n    bimg.resize(600, 400);\\n    size(img.width, img.height);\\n    img.loadPixels();\\n    bimg.loadPixels();\\n    for (int y=0; y < img.height; y++) {\\n        for (int x=0; x < img.width; x++) {\\n            color c = img.pixels[x + y * img.width];\\n            float r = red(c);\\n            float g = green(c);\\n            float b = blue(c);\\n            if (\\n            (((201 - guess) < r && r < (201 + guess)) && \\n             ((59 - guess) < g  && g < (59 + guess)) && \\n             ((98 - guess) < b && b < (98 + guess)))\\n            ||\\n            (((180 - guess) < r && r < (211 + guess)) && \\n             ((141 - guess) < g  && g < (141 + guess)) && \\n             ((151 - guess) < b && b < (151 + guess)))\\n            || // 162, 113, 116\\n            (((162 - guess) < r && r < (162 + guess)) && \\n             ((113 - guess) < g  && g < (113 + guess)) && \\n             ((120 - guess) < b && b < (116 + guess)))\\n            ||\\n            (((123 - guess) < r && r < (123 + guess)) && \\n             ((77 - guess) < g  && g < (77 + guess)) && \\n             ((80 - guess) < b && b < (80 + guess)))) {\\n                img.pixels[x + (y * img.width)] = bimg.pixels[x + (y * bimg.width)];\\n            }\\n        }\\n    }    \\n    img.updatePixels();    \\n}\\n\\nvoid mousePressed() {\\n    img.loadPixels();\\n    color c = img.pixels[mouseX + mouseY * img.width]; // img.get(mouseX, mouseY);\\n    float r = red(c);\\n    float g = green(c);\\n    float b = blue(c);\\n    println(\"RGB: (\" + mouseX + \", \" + mouseY + \") \" + r + \", \" + g + \", \" + b);\\n}\\n\\nvoid draw() {\\n    image(img, 0, 0);\\n    noLoop();\\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_1\").innerHTML = e.toString();\n",
       "        document.getElementById(\"state_1\").style.color = \"red\";\n",
       "        has_error = true;\n",
       "    }\n",
       "    if (cc != undefined) {\n",
       "        try {\n",
       "            processingInstance = new Processing(\"canvas_1\", 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_1\").innerHTML = e.toString();\n",
       "            document.getElementById(\"state_1\").style.color = \"red\";\n",
       "            processingInstance = new Processing(\"canvas_1\", 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_1\").style.display = \"none\";\n",
       "            }\n",
       "        }, 100);\n",
       "        // Controls:\n",
       "        if (!(processingInstance.isRunning() && processingInstance.draw != undefined)) {\n",
       "            document.getElementById(\"controls_div_1\").style.display = \"none\";\n",
       "        }\n",
       "        if (processingInstance.draw != undefined) {\n",
       "            if (!has_error) {\n",
       "                document.getElementById(\"state_1\").innerHTML = \"Running...\";\n",
       "                document.getElementById(\"state_1\").style.color = \"green\";\n",
       "            }\n",
       "            change_button(document.getElementById(\"run_button_1\"), true);\n",
       "            change_button(document.getElementById(\"pause_button_1\"), false);\n",
       "            change_button(document.getElementById(\"setup_button_1\"),  true);\n",
       "            change_button(document.getElementById(\"draw_button_1\"), true);\n",
       "        } else {\n",
       "            if (!has_error) {\n",
       "                document.getElementById(\"state_1\").innerHTML = \"Done.\";\n",
       "                document.getElementById(\"state_1\").style.color = \"blue\";\n",
       "            }\n",
       "            change_button(document.getElementById(\"run_button_1\"), true);\n",
       "            change_button(document.getElementById(\"pause_button_1\"), true);\n",
       "            change_button(document.getElementById(\"setup_button_1\"),  processingInstance.setup == undefined);\n",
       "            change_button(document.getElementById(\"draw_button_1\"), true);\n",
       "        }\n",
       "    } else {\n",
       "        document.getElementById(\"canvas_div_1\").style.display = \"none\";\n",
       "        document.getElementById(\"controls_div_1\").style.display = \"none\";\n",
       "        if (!has_error) {\n",
       "            document.getElementById(\"state_1\").innerHTML = \"Error.\";\n",
       "            document.getElementById(\"state_1\").style.color = \"red\";\n",
       "        }\n",
       "        change_button(document.getElementById(\"run_button_1\"), true);\n",
       "        change_button(document.getElementById(\"pause_button_1\"), true);\n",
       "        change_button(document.getElementById(\"setup_button_1\"),  true);\n",
       "        change_button(document.getElementById(\"draw_button_1\"), true);\n",
       "    }\n",
       "});\n",
       "\n",
       "</script>\n"
      ],
      "text/plain": [
       "<IPython.core.display.HTML object>"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "/* @pjs preload=\"pic3.jpg,tornadovolcano.jpg\"; */\n",
    "\n",
    "PImage img;\n",
    "PImage bimg;\n",
    "\n",
    "void setup() {\n",
    "    int guess = 13;\n",
    "    img = loadImage(\"pic3.jpg\");\n",
    "    bimg = loadImage(\"tornadovolcano.jpg\");\n",
    "    img.resize(600, 400);\n",
    "    bimg.resize(600, 400);\n",
    "    size(img.width, img.height);\n",
    "    img.loadPixels();\n",
    "    bimg.loadPixels();\n",
    "    for (int y=0; y < img.height; y++) {\n",
    "        for (int x=0; x < img.width; x++) {\n",
    "            color c = img.pixels[x + y * img.width];\n",
    "            float r = red(c);\n",
    "            float g = green(c);\n",
    "            float b = blue(c);\n",
    "            if (\n",
    "            (((201 - guess) < r && r < (201 + guess)) && \n",
    "             ((59 - guess) < g  && g < (59 + guess)) && \n",
    "             ((98 - guess) < b && b < (98 + guess)))\n",
    "            ||\n",
    "            (((180 - guess) < r && r < (211 + guess)) && \n",
    "             ((141 - guess) < g  && g < (141 + guess)) && \n",
    "             ((151 - guess) < b && b < (151 + guess)))\n",
    "            || // 162, 113, 116\n",
    "            (((162 - guess) < r && r < (162 + guess)) && \n",
    "             ((113 - guess) < g  && g < (113 + guess)) && \n",
    "             ((120 - guess) < b && b < (116 + guess)))\n",
    "            ||\n",
    "            (((123 - guess) < r && r < (123 + guess)) && \n",
    "             ((77 - guess) < g  && g < (77 + guess)) && \n",
    "             ((80 - guess) < b && b < (80 + guess)))) {\n",
    "                img.pixels[x + (y * img.width)] = bimg.pixels[x + (y * bimg.width)];\n",
    "            }\n",
    "        }\n",
    "    }    \n",
    "    img.updatePixels();    \n",
    "}\n",
    "\n",
    "void mousePressed() {\n",
    "    img.loadPixels();\n",
    "    color c = img.pixels[mouseX + mouseY * img.width]; // img.get(mouseX, mouseY);\n",
    "    float r = red(c);\n",
    "    float g = green(c);\n",
    "    float b = blue(c);\n",
    "    println(\"RGB: (\" + mouseX + \", \" + mouseY + \") \" + r + \", \" + g + \", \" + b);\n",
    "}\n",
    "\n",
    "void draw() {\n",
    "    image(img, 0, 0);\n",
    "    noLoop();\n",
    "}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "application/javascript": [
       "\n",
       "        var component = document.getElementById(\"sketch_2\");\n",
       "        if (component != undefined)\n",
       "            component.remove();\n",
       "        component = document.getElementById(\"state_2\");\n",
       "        if (component != undefined)\n",
       "            component.remove();\n",
       "        component = document.getElementById(\"controls_div_2\");\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_2\");\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>"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    },
    {
     "data": {
      "text/html": [
       "\n",
       "<div id=\"canvas_div_2\">\n",
       "  <b>Sketch #2:</b><br/>\n",
       "  <canvas id=\"canvas_2\"></canvas><br/>\n",
       "</div>\n",
       "<div id=\"controls_div_2\">\n",
       "  <button id=\"run_button_2\" onclick=\"startSketch('2');\">\n",
       "    <i class=\"fa fa-play-circle-o\" style=\"size: 2em;\"></i>\n",
       "        Run\n",
       "  </button>\n",
       "  <button id=\"pause_button_2\" onclick=\"pauseSketch('2');\">\n",
       "    <i class=\"fa fa-pause\" style=\"size: 2em;\"></i>\n",
       "        Pause\n",
       "  </button>\n",
       "  <button id=\"setup_button_2\" onclick=\"setupSketch('2');\">\n",
       "    setup()\n",
       "  </button>\n",
       "  <button id=\"draw_button_2\" onclick=\"drawSketch('2');\">\n",
       "    draw()\n",
       "  </button>\n",
       "</div>\n",
       "<b>Sketch #2 state:</b> <span id=\"state_2\">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 = '/* @pjs preload=\"pic3.jpg\"; */\\n// (34, 89) \\n// (135, 186) \\n\\nPImage img;\\nPImage head;\\n\\nHead[] heads;\\n\\nvoid setup() {\\n    img = loadImage(\"pic3.jpg\");\\n    head = createImage(135 - 34, 186 - 89, RGB);\\n    img.resize(600, 400);\\n    size(img.width, img.height);\\n    img.loadPixels();\\n    head.loadPixels();\\n    for (int x=34; x < 135; x++) {\\n        for (int y=89; y < 186; y++) {\\n            head.pixels[x - 34 + (y - 89) * head.width] = img.pixels[x + y * img.width];\\n        }\\n    }    \\n    head.updatePixels();  \\n    head.resize(30, 30);\\n    heads = new Head[100];\\n    for (int i =0; i < 100; i++) {\\n        heads[i] = new Head(random(width), random(height));\\n    }\\n    \\n}\\n\\nclass Head {\\n    float hx, hy, vx, vy;\\n    \\n    Head(float hx, float hy) {\\n        this.hx = hx;\\n        this.hy = hy;\\n        this.vx = random(5) - 2.5;\\n        this.vy = random(5) - 2.5;\\n    }\\n    \\n    void move() {\\n        hx += vx;\\n        hy += vy;\\n        if (hx > width)\\n            vx = -vx;\\n        else if (hx < 0)\\n            vx = -vx;\\n        if (hy > height)\\n            vy = -vy;\\n        else if (hy < 0)\\n            vy = -vy;\\n    }\\n    \\n    void draw() {\\n        image(head, hx, hy);\\n    }\\n}\\n\\nvoid draw() {\\n    background(255);\\n    for (int i =0; i < 100; i++) {\\n        heads[i].move();\\n        heads[i].draw();\\n    }\\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_2\").innerHTML = e.toString();\n",
       "        document.getElementById(\"state_2\").style.color = \"red\";\n",
       "        has_error = true;\n",
       "    }\n",
       "    if (cc != undefined) {\n",
       "        try {\n",
       "            processingInstance = new Processing(\"canvas_2\", 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_2\").innerHTML = e.toString();\n",
       "            document.getElementById(\"state_2\").style.color = \"red\";\n",
       "            processingInstance = new Processing(\"canvas_2\", 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_2\").style.display = \"none\";\n",
       "            }\n",
       "        }, 100);\n",
       "        // Controls:\n",
       "        if (!(processingInstance.isRunning() && processingInstance.draw != undefined)) {\n",
       "            document.getElementById(\"controls_div_2\").style.display = \"none\";\n",
       "        }\n",
       "        if (processingInstance.draw != undefined) {\n",
       "            if (!has_error) {\n",
       "                document.getElementById(\"state_2\").innerHTML = \"Running...\";\n",
       "                document.getElementById(\"state_2\").style.color = \"green\";\n",
       "            }\n",
       "            change_button(document.getElementById(\"run_button_2\"), true);\n",
       "            change_button(document.getElementById(\"pause_button_2\"), false);\n",
       "            change_button(document.getElementById(\"setup_button_2\"),  true);\n",
       "            change_button(document.getElementById(\"draw_button_2\"), true);\n",
       "        } else {\n",
       "            if (!has_error) {\n",
       "                document.getElementById(\"state_2\").innerHTML = \"Done.\";\n",
       "                document.getElementById(\"state_2\").style.color = \"blue\";\n",
       "            }\n",
       "            change_button(document.getElementById(\"run_button_2\"), true);\n",
       "            change_button(document.getElementById(\"pause_button_2\"), true);\n",
       "            change_button(document.getElementById(\"setup_button_2\"),  processingInstance.setup == undefined);\n",
       "            change_button(document.getElementById(\"draw_button_2\"), true);\n",
       "        }\n",
       "    } else {\n",
       "        document.getElementById(\"canvas_div_2\").style.display = \"none\";\n",
       "        document.getElementById(\"controls_div_2\").style.display = \"none\";\n",
       "        if (!has_error) {\n",
       "            document.getElementById(\"state_2\").innerHTML = \"Error.\";\n",
       "            document.getElementById(\"state_2\").style.color = \"red\";\n",
       "        }\n",
       "        change_button(document.getElementById(\"run_button_2\"), true);\n",
       "        change_button(document.getElementById(\"pause_button_2\"), true);\n",
       "        change_button(document.getElementById(\"setup_button_2\"),  true);\n",
       "        change_button(document.getElementById(\"draw_button_2\"), true);\n",
       "    }\n",
       "});\n",
       "\n",
       "</script>\n"
      ],
      "text/plain": [
       "<IPython.core.display.HTML object>"
      ]
     },
     "metadata": {},
     "output_type": "display_data"
    }
   ],
   "source": [
    "/* @pjs preload=\"pic3.jpg\"; */\n",
    "// (34, 89) \n",
    "// (135, 186) \n",
    "\n",
    "PImage img;\n",
    "PImage head;\n",
    "\n",
    "Head[] heads;\n",
    "\n",
    "void setup() {\n",
    "    img = loadImage(\"pic3.jpg\");\n",
    "    head = createImage(135 - 34, 186 - 89, RGB);\n",
    "    img.resize(600, 400);\n",
    "    size(img.width, img.height);\n",
    "    img.loadPixels();\n",
    "    head.loadPixels();\n",
    "    for (int x=34; x < 135; x++) {\n",
    "        for (int y=89; y < 186; y++) {\n",
    "            head.pixels[x - 34 + (y - 89) * head.width] = img.pixels[x + y * img.width];\n",
    "        }\n",
    "    }    \n",
    "    head.updatePixels();  \n",
    "    head.resize(30, 30);\n",
    "    heads = new Head[100];\n",
    "    for (int i =0; i < 100; i++) {\n",
    "        heads[i] = new Head(random(width), random(height));\n",
    "    }\n",
    "    \n",
    "}\n",
    "\n",
    "class Head {\n",
    "    float hx, hy, vx, vy;\n",
    "    \n",
    "    Head(float hx, float hy) {\n",
    "        this.hx = hx;\n",
    "        this.hy = hy;\n",
    "        this.vx = random(5) - 2.5;\n",
    "        this.vy = random(5) - 2.5;\n",
    "    }\n",
    "    \n",
    "    void move() {\n",
    "        hx += vx;\n",
    "        hy += vy;\n",
    "        if (hx > width)\n",
    "            vx = -vx;\n",
    "        else if (hx < 0)\n",
    "            vx = -vx;\n",
    "        if (hy > height)\n",
    "            vy = -vy;\n",
    "        else if (hy < 0)\n",
    "            vy = -vy;\n",
    "    }\n",
    "    \n",
    "    void draw() {\n",
    "        image(head, hx, hy);\n",
    "    }\n",
    "}\n",
    "\n",
    "void draw() {\n",
    "    background(255);\n",
    "    for (int i =0; i < 100; i++) {\n",
    "        heads[i].move();\n",
    "        heads[i].draw();\n",
    "    }\n",
    "}\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": true
   },
   "outputs": [],
   "source": []
  }
 ],
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  "kernelspec": {
   "display_name": "Calysto Processing",
   "language": "java",
   "name": "calysto_processing"
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    "name": "text/x-java",
    "version": 2
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   "file_extension": ".java",
   "mimetype": "text/x-java",
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