如何使用网格图形系统将交叉阴影应用于多边形? [英] How to apply cross-hatching to a polygon using the grid graphical system?
问题描述
rect()
和 polygon()
,支持交叉影线通过它们的 angle =
和 density =
参数: <$ p (0,0,0,1,0.5)
y = c(0.5,1,0.5,0)
par(mar = c(0,0, 0,0))
plot.new()
多边形(x,y,angle = 45,density = 10)
如何将类似交叉阴影应用于由网格图形系统的 grid.polygon()
函数绘制的多边形:
库(网格)
grid.newpage()
grid.polygon(x,y)
我查看了?grid.polygon
和?gpar
,并通过Paul Murrel的书进行了探索R图形,并且迄今为止都是空着的。我错过了明显的东西吗?如果不是,是否有一些简单的黑客可以使这成为可能?
下面是一个使用gridSVG的例子 Paul Murrell的介绍
<$ (gridSVG)
library(grid)
x = c(0,0.5,1,0.5)
y = c(0.5,1,0.5,0,0,0,0,0,0,0) 0)
grid.newpage()
grid.polygon(x,y,name =goodshape)
pat < - pattern(linesGrob(gp = gpar(col =black,lwd = 3)),
width = unit(5,mm),height = unit(5,mm),
dev.width = 1,dev.height = 1)
#注册模式
registerPatternFill(pat,pat)
#应用模式填充
grid.patternFill(goodshape,label =pat )
grid.export(test-pattern.svg)
更复杂的grobs也可以,因为svg tak
Several functions in R's base graphical system, including rect()
and polygon()
, support cross-hatching via their angle=
and density=
arguments:
x = c(0, 0.5, 1, 0.5)
y = c(0.5, 1, 0.5, 0)
par(mar=c(0,0,0,0))
plot.new()
polygon(x, y, angle=45, density=10)
How might I apply similar cross-hatching to a polygon drawn by the grid graphical system's grid.polygon()
function:
library(grid)
grid.newpage()
grid.polygon(x,y)
I've looked in the documentation for ?grid.polygon
and ?gpar
, and have skimmed through Paul Murrel's book on R graphics, and have so far come up empty. Am I missing something obvious? If not, is there some simple hack which will make this possible?
Here's an example with gridSVG adapted from Paul Murrell's presentation
library(gridSVG)
library(grid)
x = c(0, 0.5, 1, 0.5)
y = c(0.5, 1, 0.5, 0)
grid.newpage()
grid.polygon(x,y, name="goodshape")
pat <- pattern(linesGrob(gp=gpar(col="black",lwd=3)),
width = unit(5, "mm"), height = unit(5, "mm"),
dev.width = 1, dev.height = 1)
# Registering pattern
registerPatternFill("pat", pat)
# Applying pattern fill
grid.patternFill("goodshape", label = "pat")
grid.export("test-pattern.svg")
more complex grobs are allowed as well, since svg takes care of the clipping.
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