darrows: Draw Arrows

In ablejec/animatoR: Support for Animated Graphics in Base R Graphics

Description

Draw arrows from start to end location. The effect is like starting from a point and draw an arrow on the screen.

Usage

darrows(x0, y0, x1, y1, t, when, p = 1, length = 0.125, ...)

Arguments

x0	numeric vector, start x coordinates.
y0	numeric vector, start y coordinates.
x1	numeric vector, end x coordinates.
y1	numeric vector, end y coordinates.
t	numeric, homotopy parameter, limited between 0 and 1. This parameter can be considered as fraction of animation duration time.
when	numeric vector. This parameter controls the times of: entrance, exit, start of movement and, end of movement.
p	numeric, homotopy power parameter. Defaults to 1.
length	length of the edges of the arrow head (in inches).
...	additional arguments passed to arrows.

Value

List with numerical components x and y with current position.

Author(s)

Andrej Blejec [e-mail]

See Also

arrows, tarrows for moving arrows and dsegments for drawing segments.

Examples

x0 <- c(0,5,10)
y0 <- c(0,10,0)
x1 <- c(10,5,0)
y1 <- c(10,0,10)
newplot()
pos <- darrows(x0,y0,x1,y1,0.25)
points(pos)
points(x0,y0,pch="0")
points(x1,y1,pch="1")
#############
if(interactive()){
par(mfrow=c(2,2))
for( t in seq(0,1,1/3)) {
newplot()
darrows(x0,y0,x1,y1,t)
points(x0,y0,pch="0")
points(x1,y1,pch="1")
}
}
#############
if(interactive()){
par(mfrow=c(2,2))
for( t in seq(0,1,1/3)) {
newplot()
darrows(x1,y1,x0,y0,t)
points(x0,y0,pch="0")
points(x1,y1,pch="1")
}
}

ablejec/animatoR documentation built on Feb. 21, 2020, 10:09 p.m.