gdk-Drawing-Primitives: Drawing Primitives
In RGtk2: R Bindings for Gtk 2.8.0 and Above

Description Methods and Functions Hierarchy Detailed Description Structures Author(s) References

Functions for drawing points, lines, arcs, and text

gdkDrawableSetData(object, key, data)
gdkDrawableGetData(object, key)
gdkDrawableGetDisplay(object)
gdkDrawableGetScreen(object)
gdkDrawableGetVisual(object)
gdkDrawableSetColormap(object, colormap)
gdkDrawableGetColormap(object)
gdkDrawableGetDepth(object)
gdkDrawableGetSize(object)
gdkDrawableGetClipRegion(object)
gdkDrawableGetVisibleRegion(object)
gdkDrawPoint(object, gc, x, y)
gdkDrawPoints(object, gc, points)
gdkDrawLine(object, gc, x1, y1, x2, y2)
gdkDrawLines(object, gc, points)
gdkDrawPixbuf(object, gc = NULL, pixbuf, src.x, src.y, dest.x, dest.y, width = -1, height = -1, dither = "GDK_RGB_DITHER_NORMAL", x.dither = 0, y.dither = 0)
gdkDrawSegments(object, gc, segs)
gdkDrawRectangle(object, gc, filled, x, y, width, height)
gdkDrawArc(object, gc, filled, x, y, width, height, angle1, angle2)
gdkDrawPolygon(object, gc, filled, points)
gdkDrawTrapezoids(drawable, gc, trapezoids)
gdkDrawGlyphs(object, gc, font, x, y, glyphs)
gdkDrawGlyphsTransformed(drawable, gc, matrix, font, x, y, glyphs)
gdkDrawLayoutLine(object, gc, x, y, line)
gdkDrawLayoutLineWithColors(drawable, gc, x, y, line, foreground, background)
gdkDrawLayout(object, gc, x, y, layout)
gdkDrawLayoutWithColors(drawable, gc, x, y, layout, foreground, background)
gdkDrawString(object, font, gc, x, y, string)
gdkDrawText(object, font, gc, x, y, text, text.length)
gdkDrawTextWc(object, font, gc, x, text)
gdkDrawDrawable(object, gc, src, xsrc, ysrc, xdest, ydest, width, height)
gdkDrawImage(object, gc, image, xsrc, ysrc, xdest, ydest, width, height)
gdkDrawableGetImage(object, x, y, width, height)
gdkDrawableCopyToImage(object, image = NULL, src.x, src.y, dest.x, dest.y, width, height)

GObject
   +----GdkDrawable
         +----GdkWindow
         +----GdkPixmap

These functions provide support for drawing points, lines, arcs and text onto what are called 'drawables'. Drawables, as the name suggests, are things which support drawing onto them, and are either GdkWindow or GdkPixmap objects.

Many of the drawing operations take a GdkGC argument, which represents a graphics context. This GdkGC contains a number of drawing attributes such as foreground color, background color and line width, and is used to reduce the number of arguments needed for each drawing operation. See the Graphics Contexts section for more information.

Some of the drawing operations take Pango data structures like PangoContext, PangoLayout or PangoLayoutLine as arguments. If you're using GTK+, the ususal way to obtain these structures is via gtkWidgetCreatePangoContext or gtkWidgetCreatePangoLayout.

GdkDrawable

An opaque structure representing an object that can be drawn onto. This can be a GdkPixmap, a GdkBitmap, or a GdkWindow.

GdkSegment

Specifies the start and end point of a line for use by the gdkDrawSegments function. GdkSegment is a transparent-type.

x1: [integer] the x coordinate of the start point.
y1: [integer] the y coordinate of the start point.
x2: [integer] the x coordinate of the end point.
y2: [integer] the y coordinate of the end point.

GdkTrapezoid

Specifies a trapezpoid for use by the gdkDrawTrapezoids. The trapezoids used here have parallel, horizontal top and bottom edges. GdkTrapezoid is a transparent-type.

y1: [numeric] the y coordinate of the start point.
x11: [numeric] the x coordinate of the top left corner
x21: [numeric] the x coordinate of the top right corner
y2: [numeric] the y coordinate of the end point.
x12: [numeric] the x coordinate of the bottom left corner
x22: [numeric] the x coordinate of the bottom right corner