# The Moon And The Sun

Do not swear by the moon, for she changes constantly. Then your love would also change (William Shakespeare, Romeo and Juliet)

The sun is a big point ant the moon is a cardioid:

Here you have the code. It is a simple example of how to use ggplot:

library(ggplot2)
n=160
t1=1:n
t0=seq(from=3, to=2*n+1, by=2) %% n
t2=t0+(t0==0)*n
df=data.frame(x1=cos((t1-1)*2*pi/n), y1=sin((t1-1)*2*pi/n), x2=cos((t2-1)*2*pi/n), y2=sin((t2-1)*2*pi/n))
opt=theme(legend.position="none",
panel.background = element_rect(fill="white"),
panel.grid = element_blank(),
axis.ticks=element_blank(),
axis.title=element_blank(),
axis.text =element_blank())
ggplot(df, aes(x = x1, y = y1, xend = x2, yend = y2)) +
geom_point(x=0, y=0, size=245, color="gold")+
geom_segment(color="white", alpha=.5)+opt


# Trigonometric Pattern Design

Triangles are my favorite shape, three points where two lines meet (Tessellate, Alt-J)

Inspired by recurrence plots and by the Gauss error function, I have done the following plots. The first one represents the recurrence plot of $f\left ( x \right )= sec\left ( x \right )$ where distance between points is measured by Gauss error function:

This one is the same for $f\left ( x \right )= tag\left ( x \right )$

And this one represents $f\left ( x \right )= sin\left ( x \right )$

I like them: they are elegant, attractive and easy to make. Try your own functions. One final though: the more I use magrittr package, the more I like it. This is the code for the first plot.

library("magrittr")
library("ggplot2")
library("pracma")
RecurrencePlot = function(from, to, col1, col2) {
opt = theme(legend.position  = "none",
panel.background = element_blank(),
axis.ticks       = element_blank(),
panel.grid       = element_blank(),
axis.title       = element_blank(),
axis.text        = element_blank())
seq(from, to, by = .1) %>% expand.grid(x=., y=.) %>%
ggplot( ., aes(x=x, y=y, fill=erf(sec(x)-sec(y)))) + geom_tile() +