painting: Drawing API

Description Usage Arguments Author(s)

Description

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

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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

Author(s)

Michael Lawrence


qtpaint documentation built on May 30, 2017, 8:14 a.m.