How to plot bivariate function involving modulus and floor functions? I need to plot:


*

*$\displaystyle\large|||x|-2|-1|+|||y|-2|-1|=1$

*$\displaystyle\large\left\lfloor\frac{|3x+4y|}{5}\right\rfloor+\left\lfloor\frac{|4x-3y|}{5}\right\rfloor=3$


either for finding area of some region or the length of the wire, if used to make the graph(maybe the line integral.) Only consider the plotting of these graphs:
 and  

For the first : 
The graph is symmetry both about $x$-axis and $y$-axis. So, we only need to consider the case when $x\ge 0$ and $y\ge 0$. Then, note that 
$$|||a|-2|-1|=\begin{cases}-a+1&\text{if $0\le a\lt 1$}\\a-1&\text{if $1\le a\lt 2$}\\-a+3&\text{if $2\le a\lt 3$}\\a-3&\text{if $a\ge 3$}\end{cases}$$
For the second : 
Since 
$$\frac{|3x+4y|}{5}\ge 0\ \ \text{and}\ \ \frac{|4x-3y|}{5}\ge 0,$$
each term of the left-hand-side is a non-negative integer. 
Hence, we have only four cases as the followings : 
(1) 
$$\left\lfloor\frac{|3x+4y|}{5}\right\rfloor=0\ \ \text{and}\ \ \left\lfloor\frac{|4x-3y|}{5}\right\rfloor=3.$$
(2) 
$$\left\lfloor\frac{|3x+4y|}{5}\right\rfloor=1\ \ \text{and}\ \ \left\lfloor\frac{|4x-3y|}{5}\right\rfloor=2.$$
(3) 
$$\left\lfloor\frac{|3x+4y|}{5}\right\rfloor=2\ \ \text{and}\ \ \left\lfloor\frac{|4x-3y|}{5}\right\rfloor=1.$$
(4)
$$\left\lfloor\frac{|3x+4y|}{5}\right\rfloor=3\ \ \text{and}\ \ \left\lfloor\frac{|4x-3y|}{5}\right\rfloor=0.$$
