How to resize the line using kineticjs?

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// Create a stage
var stage = new Kinetic.Stage({
  container: 'container',
  width: 500,
  height: 500
});

// Create a layer
var layer = new Kinetic.Layer();

// Create a line
var line = new Kinetic.Line({
  points: [50, 50, 200, 200],
  stroke: 'black',
  strokeWidth: 2
});

// Add the line to the layer
layer.add(line);

// Add the layer to the stage
stage.add(layer);

// Resize the line
line.points([50, 50, 300, 300]);

// Redraw the layer
layer.draw();