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HTML 

              
                <div id="paper-container"></div>
<div id="power-input-container">
  <label for="power-input">Power</label>
  <input type="range" id="power-input" min="0" max="4" step="0.1" />
  <output id="power-output" for="power-input"></output>
</div>
<a target="_blank" href="https://www.jointjs.com">
  <img id="logo" src="https://assets.codepen.io/7589991/jointjs-logo.svg" width="200" height="50"></img>
</a>
!

CSS 

              
                #paper-container {
  position: absolute;
  right: 0;
  top: 0;
  left: 0;
  bottom: 0;
  overflow: scroll;
}

#power-input-container {
  position: absolute;
  font-family: sans-serif;
  font-size: 20px;
  border: 1px solid lightgray;
  background: white;
  padding: 5px 10px;
  border-radius: 3px;

  output {
    display: inline-block;
    width: 50px;
    text-align: right;
  }
}

#logo {
  position: absolute;
  bottom: 20px;
  right: 20px;
  background-color: #ffffff;
  border: 1px solid #d3d3d3;
  padding: 5px;
  box-shadow: 2px 2px 2px 1px rgba(0, 0, 0, 0.3);
}
!

JS 

              
                const { dia, shapes, util } = joint;

const paperContainerEl = document.getElementById("paper-container");
const playbackRateEl = document.getElementById("power-input");
const playbackRateOutputEl = document.getElementById("power-output");

// Turbine metrics
const r = 16;
const a = 3;
const b = 4;

// Custom view flags
const POWER_FLAG = "POWER";
const LIGHT_FLAG = "LIGHT";

class Generator extends dia.Element {
  defaults() {
    return {
      ...super.defaults,
      type: "Generator",
      size: {
        width: 60,
        height: 80
      },
      power: 0,
      attrs: {
        root: {
          magnetSelector: "body"
        },
        body: {
          width: "calc(w)",
          height: "calc(h)",
          stroke: "#7f4439",
          strokeWidth: 2,
          fill: "#945042",
          rx: 5,
          ry: 5
        },
        label: {
          text: "Generator",
          textAnchor: "middle",
          textVerticalAnchor: "top",
          x: "calc(0.5*w)",
          y: "calc(h+10)",
          fontSize: "14",
          fontFamily: "sans-serif",
          fill: "#350100"
        },
        generatorGroup: {
          transform: "translate(calc(w/2),calc(h/2))",
          event: "element:power:click",
          cursor: "pointer"
        },
        generatorBackground: {
          r: 24,
          fill: "#350100",
          stroke: "#a95b4c",
          strokeWidth: 2
        },
        generator: {
          d: `M ${a} ${a} ${b} ${r} -${b} ${r} -${a} ${a} -${r} ${b} -${r} -${b} -${a} -${a} -${b} -${r} ${b} -${r} ${a} -${a} ${r} -${b} ${r} ${b} Z`,
          stroke: "#a95b4c",
          strokeWidth: 2,
          fill: "#c99287"
        }
      }
    };
  }

  get power() {
    return Math.round(this.get("power") * 100);
  }

  preinitialize() {
    this.markup = util.svg/* xml */ `
            <rect @selector="body" />
            <g @selector="generatorGroup">
                <circle @selector="generatorBackground" />
                <path @selector="generator" />
            </g>
            <text @selector="label" />
        `;
  }
}

const GeneratorView = dia.ElementView.extend({
  presentationAttributes: dia.ElementView.addPresentationAttributes({
    power: [POWER_FLAG]
  }),

  initFlag: [dia.ElementView.Flags.RENDER, POWER_FLAG],

  powerAnimation: null,

  confirmUpdate(...args) {
    let flags = dia.ElementView.prototype.confirmUpdate.call(this, ...args);
    if (this.hasFlag(flags, POWER_FLAG)) {
      this.togglePower();
      flags = this.removeFlag(flags, POWER_FLAG);
    }
    return flags;
  },

  getSpinAnimation() {
    let { spinAnimation } = this;
    if (spinAnimation) return spinAnimation;
    const [generatorEl] = this.findBySelector("generator");
    // It's important to use start and end frames to make it work in Safari.
    const keyframes = { transform: ["rotate(0deg)", "rotate(360deg)"] };
    spinAnimation = generatorEl.animate(keyframes, {
      fill: "forwards",
      duration: 1000,
      iterations: Infinity
    });
    this.spinAnimation = spinAnimation;
    return spinAnimation;
  },

  togglePower() {
    const { model } = this;
    const playbackRate = model.get("power");
    this.getSpinAnimation().playbackRate = playbackRate;
  }
});

class Bulb extends dia.Element {
  defaults() {
    return {
      ...super.defaults,
      type: "Bulb",
      size: {
        width: 28,
        height: 30
      },
      attrs: {
        root: {
          magnetSelector: "glass"
        },
        cap1: {
          y: "calc(h + 1)",
          x: "calc(w / 2 - 6)",
          width: 12
        },
        cap2: {
          y: "calc(h + 5)",
          x: "calc(w / 2 - 5)",
          width: 10
        },
        cap: {
          fill: "#350100",
          height: 3
        },
        glass: {
          fill: "#f1f5f7",
          stroke: "#659db3",
          refD:
            "M 14.01 0 C 3.23 0.01 -3.49 11.68 1.91 21.01 C 2.93 22.78 4.33 24.31 6.01 25.48 L 6.01 32 L 22.01 32 L 22.01 25.48 C 30.85 19.31 29.69 5.89 19.93 1.32 C 18.08 0.45 16.06 0 14.01 0 Z"
        },
        label: {
          textAnchor: "middle",
          textVerticalAnchor: "middle",
          x: "calc(w / 2)",
          y: "calc(h / 2)",
          fontSize: 7,
          fontFamily: "sans-serif",
          fill: "#350100"
        }
      }
    };
  }

  preinitialize() {
    this.markup = util.svg/* xml */ `
            <rect @selector="cap1" @group-selector="cap"/>
            <rect @selector="cap2" @group-selector="cap"/>
            <path @selector="glass"/>
            <text @selector="label" />
        `;
  }

  static create(watts = 100) {
    return new this({
      watts: watts,
      attrs: {
        label: {
          text: `${watts} W`
        }
      }
    });
  }
}

const BulbView = dia.ElementView.extend({
  presentationAttributes: dia.ElementView.addPresentationAttributes({
    light: [LIGHT_FLAG]
  }),

  initFlag: [dia.ElementView.Flags.RENDER, LIGHT_FLAG],

  spinAnimation: null,

  confirmUpdate(...args) {
    let flags = dia.ElementView.prototype.confirmUpdate.call(this, ...args);
    if (this.hasFlag(flags, LIGHT_FLAG)) {
      this.toggleLight();
      flags = this.removeFlag(flags, LIGHT_FLAG);
    }
    return flags;
  },

  getGlassAnimation() {
    let { glassAnimation } = this;
    if (glassAnimation) return glassAnimation;
    const [glassEl] = this.findBySelector("glass");
    const keyframes = {
      stroke: ["#edbc26"],
      fill: ["#f5e5b7"],
      strokeWidth: [2]
    };
    glassAnimation = glassEl.animate(keyframes, {
      fill: "forwards",
      duration: 500,
      iterations: 1
    });
    this.glassAnimation = glassAnimation;
    return glassAnimation;
  },

  toggleLight() {
    const { model } = this;
    const state = model.get("light") ? 1 : -1;
    this.getGlassAnimation().playbackRate = state;
  }
});

class Wire extends dia.Link {
  defaults() {
    return {
      ...super.defaults,
      type: "Wire",
      z: -1,
      attrs: {
        line: {
          connection: true,
          stroke: "#346f83",
          strokeWidth: 2,
          strokeLinejoin: "round",
          strokeLinecap: "round"
        },
        outline: {
          connection: true,
          stroke: "#004456",
          strokeWidth: 4,
          strokeLinejoin: "round",
          strokeLinecap: "round"
        }
      }
    };
  }

  preinitialize() {
    this.markup = util.svg/* xml */ `
            <path @selector="outline" fill="none"/>
            <path @selector="line" fill="none"/>
        `;
  }
}

const StatusEffect = dia.HighlighterView.extend({
  UPDATE_ATTRIBUTES: ["power"],
  tagName: "circle",
  attributes: {
    r: 5,
    stroke: "white",
    event: "element:power:click",
    cursor: "pointer"
  },
  highlight: function (cellView) {
    const { vel } = this;
    const { model } = cellView;
    const { width, height } = model.size();
    const power = model.get("power");
    vel.attr("fill", power === 0 ? "#ed4912" : "#65b374");
    vel.attr("cx", width - 10);
    vel.attr("cy", height - 10);
  }
});

const PlaybackRateEffect = dia.HighlighterView.extend({
  UPDATE_ATTRIBUTES: ["power"],
  tagName: "text",
  attributes: {
    r: 5,
    fill: "white",
    "font-size": 7,
    "font-family": "sans-serif",
    "text-anchor": "end"
  },
  highlight: function (cellView) {
    const { vel } = this;
    const { model } = cellView;
    const { width, height } = model.size();
    const { power } = model;
    let text;
    switch (power) {
      case 0:
        text = "Off";
        break;
      case 100:
        text = "On";
        break;
      case 400:
        text = "Max";
        break;
      default:
        text = `${power} %`;
    }
    vel.attr("x", width - 18);
    vel.attr("y", height - 5);
    vel.text(text, { textVerticalAnchor: "bottom" });
  }
});

const namespace = { ...shapes, Generator, GeneratorView, Bulb, BulbView, Wire };

const graph = new dia.Graph(
  {},
  {
    cellNamespace: namespace
  }
);

const paper = new dia.Paper({
  model: graph,
  width: "100%",
  height: "100%",
  async: true,
  sorting: dia.Paper.sorting.APPROX,
  background: { color: "#F3F7F6" },
  interactive: {
    linkMove: false
  },
  cellViewNamespace: namespace,
  defaultAnchor: {
    name: "perpendicular"
  },
  defaultConnectionPoint: {
    name: "anchor"
  }
});

paperContainerEl.appendChild(paper.el);

paper.on("element:power:click", ({ model }, evt) => {
  evt.stopPropagation();
  const playbackRate = model.get("power") ? 0 : 1;
  setPlaybackRate(playbackRate);
});

playbackRateEl.addEventListener("input", ({ target }) => {
  const playbackRate = parseFloat(target.value);
  setPlaybackRate(playbackRate);
});

const generator = new Generator({
  position: { x: 50, y: 50 }
});

function setPlaybackRate(playbackRate) {
  generator.set("power", playbackRate);
  playbackRateEl.value = playbackRate;
  playbackRateOutputEl.value = `${playbackRate} x`;
}

const bulb1 = Bulb.create(100).position(150, 45);

const bulb2 = Bulb.create(40).position(150, 105);

const wire1 = new Wire({
  source: { id: generator.id },
  target: { id: bulb1.id }
});

const wire2 = new Wire({
  source: { id: generator.id },
  target: { id: bulb2.id }
});

graph.addCells([generator, bulb1, bulb2, wire1, wire2]);

StatusEffect.add(generator.findView(paper), "root", "status");
PlaybackRateEffect.add(generator.findView(paper), "root", "playback-rate");

paper.scale(4);
setPlaybackRate(1);

graph.on("change:power", (el) => toggleLights(graph, el));

function toggleLights(graph, el) {
  graph.getNeighbors(el, { outbound: true }).forEach((bulb) => {
    bulb.set("light", el.power >= bulb.get("watts"));
  });
}

toggleLights(graph, generator);
!
999px

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