1. R 그래픽스 5 : R을 이용한 도형그리기 (1) 원(circle) 그리기
par(pty="s") # “s” for small
angle <- (0:360)*pi/ # method 1
angle <- seq(-pi, pi, length=361) # method 2
x <- 3+5*cos(angle)
y <- 4+5*sin(angle)
plot(x,y, type="l", main=
"circle with radius 5 and center (3,4)")
R Graphics : Device 2 (ACTIVE)

2. R 그래픽스 5 : R을 이용한 도형그리기 (2) 대칭이동 그래프 그리기
par(oma=c(0,0,2,0))
plot(-5:5, -5:5, type="n", xlab="", ylab="")
abline(v=0)
abline(h=0)
mtext("y", side=3, line=1, cex=2)
mtext("x", side=4, line=1, cex=2)
# original
x1 <- 1:4
y1 <- c(1,4,2,3)
lines(x1,y1, lty=1, col=1)
text(4,4, "original", cex=2)
# wrt x
x2 <- x1
y2 <- -y1
lines(x2,y2, lty=2, col=2)
text(4,-4, "wrt x", cex=2)
# wrt y
x3 <- -x1
y3 <- y1
lines(x3,y3, lty=3, col=3)
text(-4,4, "wrt y", cex=2)
# wrt (0,0)
x4 <- -x1
y4 <- -y1
lines(x4,y4, lty=4, col=4)
text(-4,-4, "wrt (0,0)", cex=2)
title(main="symmetry", line=0, outer=T)
R Graphics : Device 2 (ACTIVE)

3. R 그래픽스 5 : R을 이용한 도형그리기 (3) 좌표 회전(rotation)하기
par(oma=c(0,0,2,0))
plot(-5:5, -5:5, type="n", xlab="", ylab="")
abline(v=0)
abline(h=0)
mtext("y", side=3, line=1, cex=2)
mtext("x", side=4, line=1, cex=2)
lines(x1, y1, lty=1, col=1)
text(4,4, "original", cex=1.5)
# 90 degrees rotation
angle1 <- 90/180*pi # radian angle
x2 <- x1*cos(angle1)- y1*sin(angle1)
y2 <- x1*sin(angle1)+ y1*cos(angle1)
lines(x2, y2, lty=2, col=2)
text(-4,4, "90 degrees", cex=1.5)
# 180 degrees rotation
angle2 <- 180/180*pi # radian angle
x3 <- x1*cos(angle2)- y1*sin(angle2)
y3 <- x1*sin(angle2)+ y1*cos(angle2)
lines(x3, y3, lty=3, col=3)
text(-4,-4, "180 degrees", cex=1.5)
# 270 degrees rotation
angle3 <- 270/180*pi # radian angle
x4 <- x1*cos(angle3)- y1*sin(angle3)
y4 <- x1*sin(angle3)+ y1*cos(angle3)
lines(x4, y4, lty=4, col=4)
text(4,-4, "270 degrees", cex=1.5)
title(main="rotation",line=0, outer=T)
R Graphics : Device 2 (ACTIVE)

4. R 그래픽스 5 : R을 이용한 도형그리기 (4) 다각형(polygon) 그리기
par(oma=c(0,0,2,0), mfrow=c(2,2),pty="s")
# triangle
theta <- seq(pi/2, pi/2+2*pi, by=2*pi/3)
tri.x <- cos(theta)
tri.y <- sin(theta)
plot(tri.x, tri.y, type="l", xlim=c(-1,1), ylim=c(-1,1),
main="triangle")
# square
theta <- seq(pi/4, pi/4+2*pi, by=2*pi/4)
sq.x <- cos(theta)
sq.y <- sin(theta)
plot(sq.x, sq.y, type="l", xlim=c(-1,1), ylim=c(-1,1),
main="square")
# pentagon
theta <- seq(pi/2, pi/2+2*pi, by=2*pi/5)
pent.x <- cos(theta)
pent.y <- sin(theta)
plot(pent.x, pent.y, type="l", xlim=c(-1,1), ylim=c(-1,1),
main="pentagon")
# star
s <- seq(length(pent.x))
s <- c(s[s%%2==1], s[s%%2==0])
# line 순서를 지정하는 벡터
plot(pent.x, pent.y, type="n", xlim=c(-1,1), ylim=c(-1,1), main="star shape")
lines(pent.x[s], pent.y[s])
title(main="drawing polygon", line=0, outer=T) # main title
R Graphics : Device 2 (ACTIVE)

5. R 그래픽스 5 : R을 이용한 도형그리기 (5) 확대(enlargement) 하기
R Graphics : Device 2 (ACTIVE)
par(oma=c(0,0,0,0), mfrow=c(1,1), pty="s")
angle <- (0:360)*pi/180
x1 <- 3+5*cos(angle)
y1 <- 4+5*sin(angle)
x2 <- (x1-1)*3+1
y2 <- (y1-2)*3+2
x3 <- (x1-1)*sqrt(3)+1
y3 <- (y1-2)*sqrt(3)+2
plot(x1, y1, type="l", xlim=c(-10,25),
ylim=c(-10,25))
lines(x2,y2, lty=2)
lines(x3,y3, lty=3)
points(1,2, pch=3, cex=2)
title("Enlargement of Circle")

6. R 그래픽스 5 : R을 이용한 도형그리기 (6) 타원(ellipse) 그리기
par(mfrow=c(1,1), pty="s")
x1 <- (-20:80)/10
y1 <- sqrt(1-(x1-3)^2/25)*3+4
y2 <- -sqrt(1-(x1-3)^2/25)*3+4
plot(x1,y1, type="l", ylim=c(-1,9))
lines(x1,y2, lty=2)
points(3,4, pch=3)
title("Ellipse1“)
theta <- seq(-pi, pi, length=181)
theta <- seq(-pi, pi, by=2*pi/181)
theta <- (0:180)*pi/90
x <- 5*cos(theta)
y <- 3*sin(theta)
plot(x,y, type="l", ylim=c(-5,5),main="Ellipse2")
theta <- 45*pi/180
x1 <- x*cos(theta)-y*sin(theta)
y1 <- x*sin(theta)+y*cos(theta)
plot(x,y, type="l", xlim=c(-5,5),ylim=c(-5,5))
abline(h=0)
lines(x1,y1, lty=2)
abline(a=0,b=1, lty=1)
title(expression(45*degree~~"rotation"))

7. R 그래픽스 5 : R을 이용한 도형그리기 (7) curve 함수
par(mfrow=c(2,2))
curve(x^3-3*x, -2, 2)
title(main="User defined expression")
myfun <- function(x) {x^2+2}
curve(myfun, -pi, pi) #(2) User Function
title(main="User defined function")
curve(dnorm, from=-3, to=3) #(3) R function
title(main="Normal distribution density")
plot(dnorm, from=-3, to=3) #(4) plot R function
title(main="curve by plot function")
curve(sin, from=-2*pi, to=2*pi, lty=1, col="red")
curve(cos, from=-2*pi, to=2*pi, lty=2, col="blue",
add=T)
title("add=TRUE")
curve(dnorm, from=-3, to=3, log="y")
title(main="dnorm by log=\"y\"")
R Graphics : Device 2 (ACTIVE)

8. R 그래픽스 5 : R을 이용한 도형그리기 (8) persp 함수
x <- seq(-10,10, length=30)
y <- x
f <- function(x,y){r <- sqrt(x^2+y^2); 10*sin(r)/r}
z <- outer(x,y,f)
z[is.na(z)] <- 1 #결측치를 1로 바꾼다.
persp(x,y,z, theta=30, phi=30, expand=0.5,
col="lightblue", ltheta=120, shade=0.75,
ticktype="detailed", xlab="X", ylab="Y",
zlab="Sinc(r)") -> res
title(main="Perspective Plots with Sinc Function")
R Graphics : Device 2 (ACTIVE)