GtkPrintContext {RGtk2} | R Documentation

## GtkPrintContext

### Description

Encapsulates context for drawing pages

### Methods and Functions

`gtkPrintContextGetCairoContext(object)`
`gtkPrintContextSetCairoContext(object, cr, dpi.x, dpi.y)`
`gtkPrintContextGetPageSetup(object)`
`gtkPrintContextGetWidth(object)`
`gtkPrintContextGetHeight(object)`
`gtkPrintContextGetDpiX(object)`
`gtkPrintContextGetDpiY(object)`
`gtkPrintContextGetPangoFontmap(object)`
`gtkPrintContextCreatePangoContext(object)`
`gtkPrintContextCreatePangoLayout(object)`
`gtkPrintContextGetHardMargins(object)`

### Hierarchy

    GObject
       +----GtkPrintContext

### Detailed Description

A GtkPrintContext encapsulates context information that is required when drawing pages for printing, such as the cairo context and important parameters like page size and resolution. It also lets you easily create `PangoLayout` and `PangoContext` objects that match the font metrics of the cairo surface.

GtkPrintContext objects gets passed to the ::begin-print, ::end-print, ::request-page-setup and ::draw-page signals on the `GtkPrintOperation`.

Using GtkPrintContext in a ::draw-page callback

    draw_page <- function(operation, context, page_nr)
    {
      cr <- context$getCairoContext()

      # Draw a red rectangle, as wide as the paper (inside the margins)
      cr$setSourceRgb(1.0, 0, 0)
      cr$rectangle(0, 0, context$getWidth(), 50)

      cr$fill()

      # Draw some lines
      cr$moveTo(20, 10)
      cr$lineTo(40, 20)
      cr$arc(60, 60, 20, 0, pi)
      cr$lineTo(80, 20)

      cr$setSourceRgb(0, 0, 0)
      cr$setLineWidth(5)
      cr$setLineCap("round")
      cr$setLineJoin("round")

      cr$stroke()

      # Draw some text

      layout <- context$createLayout()
      layout$setText("Hello World! Printing is easy")
      desc <- pangoFontDescriptionFromString("sans 28")
      layout$setFontDescription(desc)

      cr$moveTo(30, 20)
      cr$layoutPath(layout)

      # Font Outline
      cr$setSourceRgb(0.93, 1.0, 0.47)
      cr$setLineWidth(0.5)
      cr$strokePreserve()

      # Font Fill
      cr$setSourceRgb(0, 0.0, 1.0)
      cr$fill()
    }

Printing support was added in GTK+ 2.10.

### Structures

`GtkPrintContext`

  undocumented

### Author(s)

Derived by RGtkGen from GTK+ documentation

### References

https://developer.gnome.org/gtk2/stable/GtkPrintContext.html

[Package RGtk2 version 2.20.36.3 Index]