自古以来线条被广泛用于各种绘画中，它简约又富有变换的特点，给人一种脱离浮夸之美。本文用R语言绘制了现代感的羽毛图，心形图，幻圈图，土星环，字母印象，绚丽霞光。
羽毛图
x1 = c(seq(0, pi, length = 50), seq(pi, 2*pi, length = 50))
y1 = cos(x1) / sin(x1)
x2 = seq(1.02 * 2 * pi + pi/2, 4*pi + pi/2, length = 50)
y2 = tan(x2)
op = par(bg="black", mar=rep(.5,4))
plot(c(x1, x2), c(y1, y2), type = "n", ylim = c(-11, 11))
for (i in seq(-10, 10, length = 100))
{
lines(x1, y1 + i, col = hsv(runif(1,.65,.7), 1, 1, runif(1,.7)),
lwd = 4 * runif(1, 0.3))
lines(x2, y2 + i, col = hsv(runif(1,.65,.7), 1, 1, runif(1,.7)),
lwd = 4 * runif(1, 0.3))
}
legend("bottomright", legend = "@zhou", bty = "n", text.col = "gray70")
心形图
theta = seq(-2 * pi, 2 * pi, length = 300)
x = cos(theta)
y = x + sin(theta)
op = par(bg = "black", mar = rep(0.1, 4))
plot(x, y, type = "n", xlim = c(-8, 8), ylim = c(-1.5, 1.5))
for (i in seq(-2*pi, 2*pi, length = 100))
{
lines(i*x, y, col = hsv(runif(1, 0.85, 0.95), 1, 1, runif(1, 0.2, 0.5)),
lwd = sample(seq(.5, 3, length = 10), 1))
}
legend("bottomright", legend = "@zhou", bty = "n", text.col = "gray70")
幻圈图
theta = 1:100
x = sin(theta)
y = cos(theta)
op = par(bg = 'black', mar = rep(0.5, 4))
plot.new()
plot.window(xlim = c(-1, 1), ylim = c(-1, 1), asp = 1)
lines(x, y, col = hsv(0.65, 1, 1))
lines(0.8 * x, 0.8 * y, col = hsv(0.8, 1, 1))
lines(0.6 * x, 0.6 * y, col = hsv(0.9, 1, 1))
lines(0.4 * x, 0.4 * y, col = hsv(0.95, 1, 1))
legend("bottomright", legend = "@zhou", bty = "n", text.col = "gray70")
土星环
x = seq(-50, 50, by = 1)
y = -(x^2)
op = par(bg = 'black', mar = rep(0.5, 4))
plot(y, x, type = 'n')
lines(y, x, lwd = 2*runif(1), col = hsv(0.08, 1, 1, alpha = runif(1, 0.5, 0.9)))
for (i in seq(10, 2500, 10))
{
lines(y-i, x, lwd = 2*runif(1), col = hsv(0.08, 1, 1, alpha = runif(1, 0.5,
0.9)))
}
for (i in seq(500, 600, 10))
{
lines(y - i, x, lwd = 2*runif(1), col = hsv(0, 1, 1, alpha = runif(1, 0.5, 0.9)))
}
for (i in seq(2000, 2300, 10))
{
lines(y - i, x, lwd = 2*runif(1), col = hsv(0, 1, 1, alpha = runif(1, 0.5,
0.9)))
}
for (i in seq(100, 150, 10))
{
lines(y - i, x, lwd = 2*runif(1), col = hsv(0, 1, 1, alpha = runif(1, 0.5, 0.9)))
}
legend("bottomright", legend="@zhou", bty = "n", text.col="gray70")
字母印象
nx = 100
ny = 80
x = sample(x = 1:nx, size = 90, replace = TRUE)
y = seq(-1, -ny, length = 90)
op = par(bg = "black", mar = c(0, 0.2, 0, 0.2))
plot(1:nx, seq(-1, -nx), type = "n", xlim = c(1, nx), ylim = c(-ny+10, 1))
for (i in seq_along(x))
{
aux = sample(1:ny, 1)
points(rep(x[i], aux), y[1:aux], pch = sample(letters, aux, replace = TRUE),
col = hsv(0.35, 1, 1, runif(aux, 0.3)), cex = runif(aux, 0.3))
}
legend("bottomright", legend = "@zhou", bty = "n", text.col = "gray70")
绚丽霞光
theta = seq(0, pi, length = 300)
x = cos(theta)
y = sin(theta)op = par(bg = "black", mar = rep(0.5, 4))
plot(x, y, type = 'n')
segments(rep(0, 299), rep(0, 299), x[1:299] * runif(299, 0.7),
y[1:299] * runif(299, 0.7),
col = hsv(runif(299, 0.45, 0.55), 1, 1, runif(299, 0.5)),
lwd = 5*runif(299))
legend("topleft", legend = "@zhou", bty = "n", text.col = "gray70")
