grid.curve(grid)
grid.curve()所属R语言包：grid
Draw a Curve Between Locations
位置之间画一个曲线
译者：生物统计家园网 机器人LoveR
描述----------Description----------
These functions create and draw a curve from one location to another.
这些功能创建和绘制曲线从一个位置到另一个。
用法----------Usage----------
grid.curve(...)
curveGrob(x1, y1, x2, y2, default.units = "npc",
curvature = 1, angle = 90, ncp = 1, shape = 0.5,
square = TRUE, squareShape = 1,
inflect = FALSE, arrow = NULL, open = TRUE,
debug = FALSE,
name = NULL, gp = gpar(), vp = NULL)
arcCurvature(theta)
参数----------Arguments----------
参数：x1
A numeric vector or unit object specifying the x-location of the start point.
一个数值向量或单位对象指定的起点X-位置。
参数：y1
A numeric vector or unit object specifying the y-location of the start point.
一个数值向量或单位对象指定起点的y位置。
参数：x2
A numeric vector or unit object specifying the x-location of the end point.
一个数值向量或单位对象指定终点的X-位置。
参数：y2
A numeric vector or unit object specifying the y-location of the end point.
一个数值向量或单位对象指定终点的y位置。
参数：default.units
A string indicating the default units to use if x1, y1, x2 or y2 are only given as numeric values.
一个字符串，指示默认单位使用如果x1，y1，x2或y2只给定的数值。
参数：curvature
A numeric value giving the amount of curvature. Negative values produce left-hand curves, positive values produce right-hand curves, and zero produces a straight line.
曲率量的数值。负值产生左手的曲线，正面的价值观产生右边的曲线，和零产生一条直线。
参数：angle
A numeric value between 0 and 180, giving an amount to skew the control points of the curve. Values less than 90 skew the curve towards the start point and values greater than 90 skew the curve towards the end point.
0和180之间的数值，金额歪斜曲线的控制点。值小于90歪斜对起点的曲线和值大于90倾斜的曲线走向终点。
参数：ncp
The number of control points used to draw the curve. More control points creates a smoother curve.
用于绘制曲线的控制点的数量。更多的控制点，创建一个平滑的曲线。
参数：shape
A numeric vector of values between -1 and 1, which control the shape of the curve relative to its control points. See grid.xspline for more details.
-1和1之间的值，从而控制相对其控制点的曲线的形状的一个数值向量。看到grid.xspline更多细节。
参数：square
A logical value that controls whether control points for the curve are created city-block fashion or obliquely. When ncp is 1 and angle is 90, this is typically TRUE, otherwise this should probably be set to FALSE (see Examples below).
一个逻辑值，控制曲线的控制点是否是城市时尚块或斜。当ncp1angle90，这是典型的TRUE，否则这应该被设置为FALSE（见下面的例子）。
参数：squareShape
A shape value to control the behaviour of the curve relative to any additional control point that is inserted if square is TRUE.
一个shape值如果squareTRUE，插入任何额外的控制点来控制曲线的行为。
参数：inflect
A logical value specifying whether the curve should be cut in half and inverted (see Examples below).
一个逻辑值，指定曲线是否应削减一半，并反转（见下面的例子）。
参数：arrow
A list describing arrow heads to place at either end of the curve, as produced by the arrow function.
描述箭头头放在arrow函数的曲线，两端的列表。
参数：open
A logical value indicating whether to close the curve (connect the start and end points).
一个逻辑值，指示是否关闭曲线（连接起点和终点）。
参数：debug
A logical value indicating whether debugging information should be drawn.
显示调试信息是否应制定一个逻辑值。
参数：name
A character identifier.
字符识别。
参数：gp
An object of class gpar, typically the output from a call to the function gpar. This is basically a list of graphical parameter settings.
一个类的对象gpar，通常从调用输出函数gpar。这基本上是一个图形参数设置列表。
参数：vp
A Grid viewport object (or NULL).
一个网格视口对象（或NULL）。
参数：...
Arguments to be passed to curveGrob.
参数被传递到curveGrob。
参数：theta
An angle (in degrees).
一个角（度）。
Details
详情----------Details----------
Both functions create a curve grob (a graphical object describing an curve), but only grid.curve draws the curve.
这两个函数创建一个曲线，GROB（图形对象描述曲线），但只有grid.curve绘制的曲线。
The arcCurvature function can be used to calculate a curvature such that control points are generated on an arc corresponding to angle theta. This is typically used in conjunction with a large ncp to produce a curve corresponding to the desired arc.
arcCurvature函数可以用来计算curvature等控制点上产生相应的弧角theta。这通常是用在大ncp生产所需的弧曲线相应的配合。
值----------Value----------
A grob object.
一个GROB对象。
参见----------See Also----------
Grid, viewport, grid.xspline, arrow
电网，viewport，grid.xspline，arrow
举例----------Examples----------
curveTest <- function(i, j, ...) {
pushViewport(viewport(layout.pos.col=j, layout.pos.row=i))
do.call("grid.curve", c(list(x1=.25, y1=.25, x2=.75, y2=.75), list(...)))
grid.text(sub("list\\((.*)\\)", "\\1",
deparse(substitute(list(...)))),
y=unit(1, "npc"))
popViewport()
}
# grid.newpage()[grid.newpage（）]
pushViewport(plotViewport(c(0, 0, 1, 0),
layout=grid.layout(2, 1, heights=c(2, 1))))
pushViewport(viewport(layout.pos.row=1,
layout=grid.layout(3, 3, respect=TRUE)))
curveTest(1, 1)
curveTest(1, 2, inflect=TRUE)
curveTest(1, 3, angle=135)
curveTest(2, 1, arrow=arrow())
curveTest(2, 2, ncp=8)
curveTest(2, 3, shape=0)
curveTest(3, 1, curvature=-1)
curveTest(3, 2, square=FALSE)
curveTest(3, 3, debug=TRUE)
popViewport()
pushViewport(viewport(layout.pos.row=2,
layout=grid.layout(3, 3)))
curveTest(1, 1)
curveTest(1, 2, inflect=TRUE)
curveTest(1, 3, angle=135)
curveTest(2, 1, arrow=arrow())
curveTest(2, 2, ncp=8)
curveTest(2, 3, shape=0)
curveTest(3, 1, curvature=-1)
curveTest(3, 2, square=FALSE)
curveTest(3, 3, debug=TRUE)
popViewport(2)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注：
注1：为了方便大家学习，本文档为生物统计家园网机器人LoveR翻译而成，仅供个人R语言学习参考使用，生物统计家园保留版权。
注2：由于是机器人自动翻译，难免有不准确之处，使用时仔细对照中、英文内容进行反复理解，可以帮助R语言的学习。
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发表于 2012-2-16 20:55:03
