function strokifyDrawing(d) {
var drawing = JSON.parse(JSON.stringify(d))
var strokes = d.drawing.map(function(s) {
var points = []
s[0].forEach(function(x,i) {
points.push({x: x, y: s[1][i] })
})
return points;
})
drawing.strokes = strokes;
return drawing
}