How can i plot heat map with square as each intensity pixel instead of rectable as show in the link.

https://www.google.com/search?q=LDPlot&tbm=isch&imgil=ICFp6809JK6hWM%253A%253BVHF1_YFTi_sqJM%253Bhttps%25253A%25252F%25252Ffamilyhistorybowelcancer.wordpress.com%25252F2012%25252F12%25252F14%25252Fp21-cdkn1a-germline-variation-and-low-penetrance-predisposition-to-colorectal-cancer%25252Fld-plot-p-value%25252F&source=iu&pf=m&fir=ICFp6809JK6hWM%253A%252CVHF1_YFTi_sqJM%252C_&biw=1920&bih=925&usg=__Wj4_gQNXgkC-2_yc45whZ3X7Opw%3D&ved=0CEAQyjdqFQoTCPWe1s69wccCFcUrHgodgrYE5A&ei=--3aVbW1KcXXeILtkqAO#imgrc=ICFp6809JK6hWM%3A&usg=__Wj4_gQNXgkC-2_yc45whZ3X7Opw%3D

Pls hlep me as i am in great need.

Thanks