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HTML 

              
                <div id="paper"></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 

              
                #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);
}

#paper {
  margin: 0 auto;
}

.joint-tool[data-tool-name="button"] circle {
  fill: #333;
}

.joint-tool[data-tool-name="connect"]:not(:hover) {
  opacity: 0;
}

.active [joint-selector="line"] {
  stroke: #4666e5;
}
!

JS 

              
                const { dia, shapes, linkTools, connectors } = joint;
const { Polygon, Ellipse, Rect, toDeg } = g;
const { TangentDirections } = connectors.curve;

// Theme

const highlighterAttributes = {
  stroke: "#4666E5",
  "stroke-width": 2,
  "stroke-linecap": "butt",
  "stroke-linejoin": "miter"
};

const connectToolAttributes = {
  fill: "none",
  "stroke-width": 10,
  "stroke-opacity": 0.4,
  stroke: "#4666E5",
  cursor: "cell"
};

const lineAttributes = {
  stroke: "#333333",
  strokeWidth: 2
};

const labelAttributes = {
  textVerticalAnchor: "middle",
  textAnchor: "middle",
  x: "calc(.5*w)",
  y: "calc(.5*h)",
  fill: "#333333",
  fontSize: 18,
  fontWeight: "bold",
  fontFamily: "sans-serif",
  fontVariant: "small-caps",
  pointerEvents: "none"
};

const bodyAttributes = {
  fill: "#FCFCFC",
  stroke: "#333333",
  strokeWidth: 2,
  cursor: "grab"
};

const ShapeTypes = {
  BASE: "Base",
  RHOMBUS: "Rhombus",
  RECTANGLE: "Rectangle",
  ELLIPSE: "Ellipse",
  LINK: "Link"
};

// Setup

const graph = new dia.Graph({}, { cellNamespace: shapes });
const paper = new dia.Paper({
  el: document.getElementById("paper"),
  model: graph,
  cellViewNamespace: shapes,
  width: 780,
  height: 490,
  gridSize: 1,
  async: true,
  sorting: dia.Paper.sorting.APPROX,
  background: { color: "#F3F7F6" },
  snapLinks: true,
  highlighting: {
    default: {
      name: "mask",
      options: {
        attrs: {
          ...highlighterAttributes
        }
      }
    }
  },
  // This demo does not use the connection points
  defaultConnectionPoint: { name: "anchor" },
  connectionStrategy: function (end, view, _, coords) {
    const { x, y } = view.model.getBoundaryPoint(coords);
    end.anchor = {
      name: "topLeft",
      args: {
        dx: x,
        dy: y,
        rotate: true
      }
    };
  },
  defaultConnector: function (sourcePoint, targetPoint, route, _, linkView) {
    const { model: link } = linkView;
    const targetElement = link.getTargetElement();
    const sourceElement = link.getSourceElement();
    const options = {
      targetDirection: targetElement
        ? targetElement.getCurveDirection(targetPoint)
        : TangentDirections.AUTO,
      sourceDirection: sourceElement
        ? sourceElement.getCurveDirection(sourcePoint)
        : TangentDirections.AUTO
    };
    return connectors.curve(sourcePoint, targetPoint, route, options, linkView);
  },
  defaultLink: () => new Link()
});

paper.svg.style.overflow = "visible";
paper.el.style.border = "1px solid #E5E5E5";
paper.on({
  "cell:mouseenter": (view) => {
    addTools(view);
  },
  "cell:mouseleave": (view) => {
    removeTools(view);
  }
});

graph.on({
  add: (cell) => {
    addTools(cell.findView(paper));
  }
});

const BaseShape = dia.Element.define(
  ShapeTypes.BASE,
  {
    z: 1
  },
  {
    getConnectToolMarkup() {
      return [
        {
          tagName: "rect",
          attributes: {
            ...this.size(),
            ...connectToolAttributes
          }
        }
      ];
    },

    getCurveDirection() {
      return TangentDirections.AUTO;
    },

    getBoundaryPoint(point, snapRadius = 20) {
      const bbox = this.getBBox();
      const angle = this.angle();
      // Relative to the element's position
      const relPoint = point
        .clone()
        .rotate(bbox.center(), angle)
        .difference(bbox.topLeft());
      const relBBox = new Rect(0, 0, bbox.width, bbox.height);
      if (!relBBox.containsPoint(relPoint)) {
        const relCenter = relBBox.center();
        const relTop = relBBox.topMiddle();
        const relLeft = relBBox.leftMiddle();
        if (Math.abs(relTop.x - relPoint.x) < snapRadius) {
          return relCenter.y > relPoint.y ? relTop : relBBox.bottomMiddle();
        }
        if (Math.abs(relLeft.y - relPoint.y) < snapRadius) {
          return relCenter.x > relPoint.x ? relLeft : relBBox.rightMiddle();
        }
      }
      return this.getClosestBoundaryPoint(relBBox, relPoint);
    },

    getClosestBoundaryPoint(bbox, point) {
      return bbox.pointNearestToPoint(point);
    },

    getTools() {
      return [
        new linkTools.Connect({
          focusOpacity: 0,
          markup: this.getConnectToolMarkup()
        })
      ];
    }
  }
);

const Link = shapes.standard.Link.define(
  ShapeTypes.LINK,
  {
    attrs: {
      line: {
        ...lineAttributes
      }
    },
    z: 2
  },
  {
    getTools() {
      return [
        new linkTools.Vertices(),
        new linkTools.Remove(),
        new linkTools.SourceArrowhead(),
        new linkTools.TargetArrowhead()
      ];
    }
  }
);

const RhombusShape = BaseShape.define(
  ShapeTypes.RHOMBUS,
  {
    size: { width: 140, height: 70 },
    attrs: {
      root: {
        highlighterSelector: "body"
      },
      body: {
        d:
          "M calc(.5*w) 0 calc(w) calc(.5*h) calc(.5*w) calc(h) 0 calc(.5*h) Z",
        ...bodyAttributes
      },
      label: {
        text: "Rhombus",
        ...labelAttributes
      }
    }
  },
  {
    markup: [
      {
        tagName: "path",
        selector: "body"
      },
      {
        tagName: "text",
        selector: "label"
      }
    ],

    getConnectToolMarkup() {
      const { width, height } = this.size();
      return [
        {
          tagName: "path",
          attributes: {
            d: `M ${width / 2} 0 ${width} ${height / 2} ${
              width / 2
            } ${height} 0 ${height / 2} Z`,
            ...connectToolAttributes
          }
        }
      ];
    },

    getCurveDirection(point) {
      const bbox = this.getBBox();
      const angle = bbox.center().angleBetween(point, bbox.topMiddle());
      if (angle % 90 === 0) {
        return "auto";
      }
      let ratio = bbox.height / bbox.width;
      if (angle % 180 < 90) {
        ratio = 1 / ratio;
      }
      return 360 - Math.floor(angle / 90) * 90 + toDeg(Math.atan(ratio));
    },

    getClosestBoundaryPoint(bbox, point) {
      const rhombus = new Polygon([
        bbox.topMiddle(),
        bbox.rightMiddle(),
        bbox.bottomMiddle(),
        bbox.leftMiddle()
      ]);
      return rhombus.closestPoint(point);
    }
  }
);

const RectangleShape = BaseShape.define(
  ShapeTypes.RECTANGLE,
  {
    size: { width: 140, height: 70 },
    attrs: {
      root: {
        highlighterSelector: "body"
      },
      body: {
        width: "calc(w)",
        height: "calc(h)",
        ...bodyAttributes
      },
      label: {
        text: "Rectangle",
        ...labelAttributes
      }
    }
  },
  {
    markup: [
      {
        tagName: "rect",
        selector: "body"
      },
      {
        tagName: "text",
        selector: "label"
      }
    ]
  }
);

const EllipseShape = BaseShape.define(
  ShapeTypes.ELLIPSE,
  {
    size: { width: 140, height: 70 },
    attrs: {
      root: {
        highlighterSelector: "body"
      },
      body: {
        cx: "calc(.5*w)",
        cy: "calc(.5*h)",
        rx: "calc(.5*w)",
        ry: "calc(.5*h)",
        ...bodyAttributes
      },
      label: {
        text: "Ellipse",
        ...labelAttributes
      }
    }
  },
  {
    markup: [
      {
        tagName: "ellipse",
        selector: "body"
      },
      {
        tagName: "text",
        selector: "label"
      }
    ],

    getConnectToolMarkup() {
      const { width, height } = this.size();
      return [
        {
          tagName: "ellipse",
          attributes: {
            rx: width / 2,
            ry: height / 2,
            cx: width / 2,
            cy: height / 2,
            ...connectToolAttributes
          }
        }
      ];
    },

    getCurveDirection() {
      return TangentDirections.OUTWARDS;
    },

    getClosestBoundaryPoint(bbox, point) {
      const ellipse = Ellipse.fromRect(bbox);
      return ellipse.intersectionWithLineFromCenterToPoint(point);
    }
  }
);

const rhombus = new RhombusShape({
  position: { x: 50, y: 250 }
});

const rectangle = new RectangleShape({
  position: { x: 450, y: 50 }
});

const ellipse = new EllipseShape({
  position: { x: 450, y: 300 }
});

const link1 = new Link({
  source: {
    id: rectangle.id,
    anchor: {
      name: "bottom"
    }
  },
  target: {
    id: rhombus.id,
    anchor: {
      name: "topLeft",
      args: {
        dx: 113.6,
        dy: 48.2,
        rotate: true
      }
    }
  }
});

const link2 = new Link({
  source: {
    id: rectangle.id,
    anchor: {
      name: "bottom"
    }
  },
  target: {
    id: ellipse.id,
    anchor: {
      name: "topLeft",
      args: {
        dx: 112.2,
        dy: 7,
        rotate: true
      }
    }
  }
});

const link3 = new Link({
  source: {
    id: ellipse.id,
    anchor: {
      name: "topLeft",
      args: {
        dx: 8.893956250391483,
        dy: 52.07374751827297,
        rotate: true
      }
    }
  },
  target: {
    id: rhombus.id,
    anchor: {
      name: "topLeft",
      args: {
        dx: 98.00000000000001,
        dy: 56,
        rotate: true
      }
    }
  }
});

graph.resetCells([rectangle, ellipse, rhombus, link1, link2, link3]);

// Tools

function addTools(view) {
  const { paper, model } = view;
  paper.removeTools();
  const tools = new dia.ToolsView({ tools: model.getTools() });
  view.el.classList.add("active");
  view.addTools(tools);
}

function removeTools(view) {
  view.el.classList.remove("active");
  view.removeTools();
}
!
999px

Console