How to implement minimap of kineticjs layer?

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var minimapLayer = new Kinetic.Layer();

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var minimapRect = new Kinetic.Rect({
    x: 0,
    y: 0,
    width: stage.getWidth() / 4, // adjust size as needed
    height: stage.getHeight() / 4,
    fill: 'rgba(0, 0, 0, 0.2)',
    stroke: 'black',
    strokeWidth: 1
});

minimapLayer.add(minimapRect);

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stage.add(minimapLayer);

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// Update minimap view area based on main layer's position and scale
minimapRect.setX(mainLayer.getX() * scale);
minimapRect.setY(mainLayer.getY() * scale);
minimapRect.setWidth(stage.getWidth() / scale);
minimapRect.setHeight(stage.getHeight() / scale);

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// Update scale of minimap view area based on main layer's scale
var scale = mainLayer.getScale().x; // assuming x and y scales are the same
minimapLayer.setScale({x: 1 / scale, y: 1 / scale });