painting

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Drawing API

These functions constitute the primary drawing API. There is support for drawing points, polylines, segments, circles, rectangles, polygons, vector paths, text, images and plot glyphs.

Usage
qdrawLine(p, x, y, stroke)
qdrawSegment(p, x0, y0, x1, y1, stroke)
qdrawPoint(p, x, y, stroke)
qdrawRect(p, xleft, ybottom, xright, ytop, stroke, fill)
qdrawCircle(p, x, y, r, stroke, fill)
qdrawPolygon(p, x, y, stroke, fill)
qdrawPath(p, path, stroke, fill)
qdrawText(p, text, x, y, halign=c("center", "left", "right"), valign=c("center",
    "basecenter", "baseline", "bottom", "top"), rot=0, color, cex=1,
    hcex=cex, vcex=cex)
qdrawImage(p, image, x, y)
qdrawGlyph(p, path, x, y, cex, stroke, fill)
Arguments
p
The paint context
x
The X coordinate vector, recycled. For polygons and polylines, NA values separate the graphical primitives.
y
The Y coordinate vector, recycled. For polygons and polylines, NA values separate the graphical primitives.
stroke
The vector of stroke colors, either a C++ QColor object, a matrix returned by col2rgb or any valid input to col2rgb, recycled
x0
The vector of first X coordinates, recycled
y0
The vector of first Y coordinates, recycled
x1
The vector of second X coordinates, recycled
y1
The vector of second Y coordinates, recycled
fill
The vector of fill colors, either a C++ QColor object, a matrix returned by col2rgb or any valid input to col2rgb, recycled
xleft
The vector of left X coordinates for a rectangle, recycled
ybottom
The vector of bottom Y coordinates for a rectangle, recycled
xright
The vector of right X coordinates for a rectangle, recycled
ytop
The vector of top Y coordinates for a rectangle, recycled
r
The radius of the circle, in device coordinates, recycled
path
A C++ QPainterPath object describing the glyph, or a list of such objects for qdrawPath.
text
The vector of strings to draw, recycled
halign
The side of the text to horizontally align to the coordinate
valign
The side of the text to vertically align to the coordinate. Besides the obvious alignment options, there are two different ways to center the text: according to the entire text extents ("center") or only according to the region above the baseline ("basecenter"). The former may be better for plotting text, while the latter may be better for labeling.
rot
The vector of the text rotations, in degrees, recycled
color
The stroke color of the text
cex
The vector of numeric expansion factors of the glyphs, recycled
hcex
The vector of numeric horizontal expansion factors of the glyphs, recycled. Overrides the cex in the horizontal direction.
vcex
The vector of numeric vertical expansion factors of the glyphs, recycled. Overrides the cex in the vertical direction.
image
A C++ QImage object
Aliases
  • qdrawLine
  • qdrawSegment
  • qdrawPoint
  • qdrawRect
  • qdrawCircle
  • qdrawPolygon
  • qdrawPath
  • qdrawText
  • qdrawImage
  • qdrawGlyph
Documentation reproduced from package qtpaint, version 1.1.0, License: GPL version 2 or later

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