如何根据使用D3.js在json中给出的数据在Heatmap中创建可变大小的矩形？

I have made a Heatmap which represents the value by color intensity.how to create a Heatmap in which size of rectangles will be used to represent the value from json? I have tried the following code which is not giving the required output.I have made a Heatmap which represents the valu