Shape

canvas.node(1).add({
    shape: 'rect',
    size: [30, 30],
    labels: { 0: { text: 'Square' } }
})

canvas.node(2).add({
    shape: 'rect',
    size: [40, 12],
    labels: { 0: { text: 'Rectangle' } }
})

canvas.node(3).add({
    shape: 'circle',
    size: 25,
    labels: { 0: { text: 'Circle' } }
})

canvas.edges([[1, 2], [2, 3], [3, 1]]).add()