FLTK 1.3.9: Fl_Printer Class Reference

FLTK 1.3.9

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Public Member Functions | Static Public Attributes | List of all members
Fl_Printer Class Reference

OS-independent print support. More...

`#include <Fl_Printer.H>`

Inheritance diagram for Fl_Printer:

## Public Member Functions
const char * | class_name ()
| Returns the name of the class of this object.
Fl_Graphics_Driver * | driver (void)
void | end_job (void)
| To be called at the end of a print job.
int | end_page (void)
| To be called at the end of each page.
| Fl_Printer (void)
| The constructor.
void | margins (int *left, int *top, int *right, int *bottom)
| Computes the dimensions of margins that lie between the printable page area and the full page.
void | origin (int *x, int *y)
| Computes the page coordinates of the current origin of graphics functions.
void | origin (int x, int y)
| Sets the position in page coordinates of the origin of graphics functions.
void | print_widget (Fl_Widget *widget, int delta_x=0, int delta_y=0)
| Draws the widget on the printed page.
void | print_window_part (Fl_Window *win, int x, int y, int w, int h, int delta_x=0, int delta_y=0)
| Prints a rectangular part of an on-screen window.
int | printable_rect (int *w, int *h)
| Computes the width and height of the printable area of the page.
void | rotate (float angle)
| Rotates the graphics operations relatively to paper.
void | scale (float scale_x, float scale_y=0.)
| Changes the scaling of page coordinates.
void | set_current (void)
| Make this surface the current drawing surface.
int | start_job (int pagecount, int *frompage=NULL, int *topage=NULL)
| Starts a print job.
int | start_page (void)
| Starts a new printed page.
void | translate (int x, int y)
| Translates the current graphics origin accounting for the current rotation.
void | untranslate (void)
| Undoes the effect of a previous translate() call.
| ~Fl_Printer (void)
| The destructor.
Public Member Functions inherited from Fl_Paged_Device
void | print_window (Fl_Window *win, int x_offset=0, int y_offset=0)
| Prints a window with its title bar and frame if any.
virtual | ~Fl_Paged_Device ()
| The destructor.
Public Member Functions inherited from Fl_Surface_Device
const char * | class_name ()
| Returns the name of the class of this object.
Fl_Graphics_Driver * | driver ()
| Returns the graphics driver of this drawing surface.
void | driver (Fl_Graphics_Driver *graphics_driver)
| Sets the graphics driver of this drawing surface.
virtual | ~Fl_Surface_Device ()
| The destructor.
Public Member Functions inherited from Fl_Device
virtual | ~Fl_Device ()
| Virtual destructor.

## Static Public Attributes
static const char * | class_id = "Fl_Printer"
These attributes are effective under the Xlib platform only.
static const char * | dialog_title = "Print"
| [this text may be customized at run-time]
static const char * | dialog_printer = "Printer:"
| [this text may be customized at run-time]
static const char * | dialog_range = "Print Range"
| [this text may be customized at run-time]
static const char * | dialog_copies = "Copies"
| [this text may be customized at run-time]
static const char * | dialog_all = "All"
| [this text may be customized at run-time]
static const char * | dialog_pages = "Pages"
| [this text may be customized at run-time]
static const char * | dialog_from = "From:"
| [this text may be customized at run-time]
static const char * | dialog_to = "To:"
| [this text may be customized at run-time]
static const char * | dialog_properties = "Properties..."
| [this text may be customized at run-time]
static const char * | dialog_copyNo = "# Copies:"
| [this text may be customized at run-time]
static const char * | dialog_print_button = "Print"
| [this text may be customized at run-time]
static const char * | dialog_cancel_button = "Cancel"
| [this text may be customized at run-time]
static const char * | dialog_print_to_file = "Print To File"
| [this text may be customized at run-time]
static const char * | property_title = "Printer Properties"
| [this text may be customized at run-time]
static const char * | property_pagesize = "Page Size:"
| [this text may be customized at run-time]
static const char * | property_mode = "Output Mode:"
| [this text may be customized at run-time]
static const char * | property_use = "Use"
| [this text may be customized at run-time]
static const char * | property_save = "Save"
| [this text may be customized at run-time]
static const char * | property_cancel = "Cancel"
| [this text may be customized at run-time]
Static Public Attributes inherited from Fl_Paged_Device
static const char * | class_id = "Fl_Paged_Device"
static const page_format | page_formats [NO_PAGE_FORMATS]
| width, height and name of all elements of the enum Page_Format.
Static Public Attributes inherited from Fl_Surface_Device
static const char * | class_id = "Fl_Surface_Device"
Static Public Attributes inherited from Fl_Device
static const char * | class_id = "Fl_Device"
| A string that identifies each subclass of Fl_Device.

## Additional Inherited Members
Public Types inherited from Fl_Paged_Device
enum | Page_Format { A0 = 0 , A1 , A2 , A3 , A4 , A5 , A6 , A7 , A8 , A9 , B0 , B1 , B2 , B3 , B4 , B5 , B6 , B7 , B8 , B9 , B10 , C5E , DLE , EXECUTIVE , FOLIO , LEDGER , LEGAL , LETTER , TABLOID , ENVELOPE , MEDIA = 0x1000 }
| Possible page formats. More...
enum | Page_Layout { PORTRAIT = 0 , LANDSCAPE = 0x100 , REVERSED = 0x200 , ORIENTATION = 0x300 }
| Possible page layouts. More...
Static Public Member Functions inherited from Fl_Surface_Device
static Fl_Surface_Device * | surface ()
| The current drawing surface.
Protected Member Functions inherited from Fl_Paged_Device
| Fl_Paged_Device ()
| The constructor.
Protected Member Functions inherited from Fl_Surface_Device
| Fl_Surface_Device (Fl_Graphics_Driver *graphics_driver)
| Constructor that sets the graphics driver to use for the created surface.
Protected Attributes inherited from Fl_Paged_Device
int | x_offset
| horizontal offset to the origin of graphics coordinates
int | y_offset
| vertical offset to the origin of graphics coordinates

## Detailed Description

OS-independent print support.

Fl_Printer allows to use all drawing, color, text, image, and clip FLTK functions, and to have them operate on printed page(s). There are two main, non exclusive, ways to use it.

- Print any widget (standard, custom, Fl_Window, Fl_Gl_Window) as it appears on screen, with optional translation, scaling and rotation. This is done by calling print_widget(), print_window() or print_window_part().
- Use a series of FLTK graphics commands (e.g., font, text, lines, colors, clip, image) to compose a page appropriately shaped for printing.

In both cases, begin by start_job(), start_page(), printable_rect() and origin() calls and finish by end_page() and end_job() calls.

Example of use: print a widget centered in a page

#include <FL/Fl_Printer.H>
#include <FL/fl_draw.H>
int width, height;
Fl_Widget *widget = ... // a widget we want printed
Fl_Printer *printer = new Fl_Printer();
if (printer->start_job(1) == 0) {
printer->start_page();
printer->printable_rect(&width, &height);
fl_color(FL_BLACK);
fl_line_style(FL_SOLID, 2);
fl_rect(0, 0, width, height);
fl_font(FL_COURIER, 12);
time_t now; time(&now); fl_draw(ctime(&now), 0, fl_height());
printer->origin(width/2, height/2);
printer->print_widget(widget, -widget->w()/2, -widget->h()/2);
printer->end_page();
printer->end_job();
}
delete printer;
FL_COURIER
const Fl_Font FL_COURIER
Courier normal.
Definition Enumerations.H:881
Fl_Printer.H
declaration of classes Fl_Printer, Fl_System_Printer and Fl_PostScript_Printer.
Fl_Printer
OS-independent print support.
Definition Fl_Printer.H:176
Fl_Printer::print_widget
void print_widget(Fl_Widget *widget, int delta_x=0, int delta_y=0)
Draws the widget on the printed page.
Definition Fl_Printer.cxx:173
Fl_Printer::end_job
void end_job(void)
To be called at the end of a print job.
Definition Fl_Printer.cxx:168
Fl_Printer::Fl_Printer
Fl_Printer(void)
The constructor.
Definition Fl_Printer.cxx:92
Fl_Printer::start_job
int start_job(int pagecount, int *frompage=NULL, int *topage=NULL)
Starts a print job.
Definition Fl_Printer.cxx:113
Fl_Printer::start_page
int start_page(void)
Starts a new printed page.
Definition Fl_Printer.cxx:118
Fl_Printer::origin
void origin(int *x, int *y)
Computes the page coordinates of the current origin of graphics functions.
Definition Fl_Printer.cxx:133
Fl_Printer::end_page
int end_page(void)
To be called at the end of each page.
Definition Fl_Printer.cxx:163
Fl_Printer::printable_rect
int printable_rect(int *w, int *h)
Computes the width and height of the printable area of the page.
Definition Fl_Printer.cxx:123
Fl_Widget
Fl_Widget is the base class for all widgets in FLTK.
Definition Fl_Widget.H:101
Fl_Widget::w
void w(int v)
Internal use only.
Definition Fl_Widget.H:143
Fl_Widget::h
void h(int v)
Internal use only.
Definition Fl_Widget.H:145
fl_draw.H
utility header to pull drawing functions together
fl_height
int fl_height()
Returns the recommended minimum line spacing for the current font.
Definition fl_draw.H:527
fl_font
Fl_Font fl_font()
Returns the face set by the most recent call to fl_font().
Definition fl_draw.H:515
fl_color
Fl_Color fl_color()
Returns the last fl_color() that was set.
Definition fl_draw.H:70
fl_rect
void fl_rect(int x, int y, int w, int h)
Draws a 1-pixel border inside the given bounding box.
Definition fl_draw.H:201
fl_line_style
void fl_line_style(int style, int width=0, char *dashes=0)
Sets how to draw lines (the "pen").
Definition fl_draw.H:177
fl_draw
FL_EXPORT void fl_draw(const char *str, int x, int y)
Draws a nul-terminated UTF-8 string starting at the given x, y location.
Definition fl_font.cxx:70
FL_SOLID
@ FL_SOLID
line style: ___________
Definition fl_draw.H:179

Platform specifics

- Unix/Linux platforms: Unless it has been previously changed, the default paper size is A4. To change that, press the "Properties" button of the "Print" dialog window opened by an Fl_Printer::start_job() call. This opens a "Printer Properties" window where it's possible to select the adequate paper size. Finally press the "Save" button therein to assign the chosen paper size to the chosen printer for this and all further print operations.
  Class Fl_RGB_Image prints but loses its transparency if it has one. See class Fl_PostScript_Graphics_Driver for a description of how UTF-8 strings appear in print. Use the static public attributes of this class to set the print dialog to other languages than English. For example, the "Printer:" dialog item Fl_Printer::dialog_printer can be set to French with:
  Fl_Printer::dialog_printer = "Imprimante:";
  Fl_Printer::dialog_printer
  static const char * dialog_printer
  [this text may be customized at run-time]
  Definition Fl_Printer.H:205
  before creation of the Fl_Printer object. Use Fl_PostScript_File_Device::file_chooser_title to customize the title of the file chooser dialog that opens when using the "Print To File" option of the print dialog.
- MSWindows platform: Transparent Fl_RGB_Image 's don't print with exact transparency on most printers. Fl_RGB_Image 's don't rotate() well. A workaround is to use the print_window_part() call.
- Mac OS X platform: all graphics requests print as on display.

## Member Function Documentation

## ◆ class_name()

const char * Fl_Printer::class_name | ( |  | ) |
| inlinevirtual

Returns the name of the class of this object.

Use of the class_name() function is discouraged because it will be removed from future FLTK versions.

The class of an instance of an Fl_Device subclass can be checked with code such as:

if ( instance->class_name() == Fl_Printer::class_id ) { ... }

Reimplemented from Fl_Paged_Device.

## ◆ end_job()

void Fl_Printer::end_job | ( | void |  | ) |
| virtual

To be called at the end of a print job.

Reimplemented from Fl_Paged_Device.

## ◆ end_page()

int Fl_Printer::end_page | ( | void |  | ) |
| virtual

To be called at the end of each page.

Returns
  0 if OK, non-zero if any error.

Reimplemented from Fl_Paged_Device.

## ◆ margins()

void Fl_Printer::margins | ( | int * | left,
|  | int * | top,
|  | int * | right,
|  | int * | bottom )
| virtual

Computes the dimensions of margins that lie between the printable page area and the full page.

Values are in the same unit as that used by FLTK drawing functions. They are changed by scale() calls.

Parameters

  [out] | left | If non-null, *left is set to the left margin size.
  [out] | top | If non-null, *top is set to the top margin size.
  [out] | right | If non-null, *right is set to the right margin size.
  [out] | bottom | If non-null, *bottom is set to the bottom margin size.

Reimplemented from Fl_Paged_Device.

## ◆ origin() [1/2]

void Fl_Printer::origin | ( | int * | x,
|  | int * | y )
| virtual

Computes the page coordinates of the current origin of graphics functions.

Parameters

  [out] | x | If non-null, *x is set to the horizontal page offset of graphics origin.
  [out] | y | Same as above, vertically.

Reimplemented from Fl_Paged_Device.

## ◆ origin() [2/2]

void Fl_Printer::origin | ( | int | x,
|  | int | y )
| virtual

Sets the position in page coordinates of the origin of graphics functions.

Arguments should be expressed relatively to the result of a previous printable_rect() call. That is, `printable_rect(&w, &h); origin(w/2, 0);` sets the graphics origin at the top center of the page printable area. Origin() calls are not affected by rotate() calls. Successive origin() calls don't combine their effects.

Parameters

  [in] | x | Horizontal position in page coordinates of the desired origin of graphics functions.
  [in] | y | Same as above, vertically.

Reimplemented from Fl_Paged_Device.

## ◆ print_widget()

void Fl_Printer::print_widget | ( | Fl_Widget * | widget,
|  | int | delta_x = 0,
|  | int | delta_y = 0 )
| virtual

Draws the widget on the printed page.

The widget's position on the printed page is determined by the last call to origin() and by the optional delta_x and delta_y arguments. Its dimensions are in points unless there was a previous call to scale().

Parameters

  [in] | widget | Any FLTK widget (e.g., standard, custom, window).
  [in] | delta_x | Optional horizontal offset for positioning the widget relatively to the current origin of graphics functions.
  [in] | delta_y | Same as above, vertically.

Reimplemented from Fl_Paged_Device.

## ◆ print_window_part()

void Fl_Printer::print_window_part | ( | Fl_Window * | win,
|  | int | x,
|  | int | y,
|  | int | w,
|  | int | h,
|  | int | delta_x = 0,
|  | int | delta_y = 0 )
| virtual

Prints a rectangular part of an on-screen window.

Parameters

  win | The window from where to capture.
  x | The rectangle left
  y | The rectangle top
  w | The rectangle width
  h | The rectangle height
  delta_x | Optional horizontal offset from current graphics origin where to print the captured rectangle.
  delta_y | As above, vertically.

Reimplemented from Fl_Paged_Device.

## ◆ printable_rect()

int Fl_Printer::printable_rect | ( | int * | w,
|  | int * | h )
| virtual

Computes the width and height of the printable area of the page.

Values are in the same unit as that used by FLTK drawing functions, are unchanged by calls to origin(), but are changed by scale() calls. Values account for the user-selected paper type and print orientation.

Returns
  0 if OK, non-zero if any error

Reimplemented from Fl_Paged_Device.

## ◆ rotate()

void Fl_Printer::rotate | ( | float | angle | ) |
| virtual

Rotates the graphics operations relatively to paper.

The rotation is centered on the current graphics origin. Successive rotate() calls don't combine their effects.

Parameters

  angle | Rotation angle in counter-clockwise degrees.

Reimplemented from Fl_Paged_Device.

## ◆ scale()

void Fl_Printer::scale | ( | float | scale_x,
|  | float | scale_y = 0. )
| virtual

Changes the scaling of page coordinates.

This function also resets the origin of graphics functions at top left of printable page area. After a scale() call, do a printable_rect() call to get the new dimensions of the printable page area. Successive scale() calls don't combine their effects.

Parameters

  scale_x | Horizontal dimensions of plot are multiplied by this quantity.
  scale_y | Same as above, vertically. The value 0. is equivalent to setting `scale_y` = `scale_x`. Thus, scale(factor); is equivalent to scale(factor, factor);

Reimplemented from Fl_Paged_Device.

## ◆ set_current()

void Fl_Printer::set_current | ( | void |  | ) |
| virtual

Make this surface the current drawing surface.

This surface will receive all future graphics requests.

Reimplemented from Fl_Surface_Device.

## ◆ start_job()

int Fl_Printer::start_job | ( | int | pagecount,
|  | int * | frompage = NULL,
|  | int * | topage = NULL )
| virtual

Starts a print job.

Opens a platform-specific dialog window allowing the user to set several options including the desired printer and the page orientation. Optionally, the user can also select a range of pages to be printed. This range is returned to the caller that is in charge of sending only these pages for printing.

Parameters

  [in] | pagecount | the total number of pages of the job (or 0 if you don't know the number of pages)
  [out] | frompage | if non-null, *frompage is set to the first page the user wants printed
  [out] | topage | if non-null, *topage is set to the last page the user wants printed

Returns
  0 if OK, non-zero if any error occurred or if the user cancelled the print request.

Reimplemented from Fl_Paged_Device.

## ◆ start_page()

int Fl_Printer::start_page | ( | void |  | ) |
| virtual

Starts a new printed page.

The page coordinates are initially in points, i.e., 1/72 inch, and with origin at the top left of the printable page area.

Returns
  0 if OK, non-zero if any error

Reimplemented from Fl_Paged_Device.

## ◆ translate()

void Fl_Printer::translate | ( | int | x,
|  | int | y )
| virtual

Translates the current graphics origin accounting for the current rotation.

This function is only useful after a rotate() call. Each translate() call must be matched by an untranslate() call. Successive translate() calls add up their effects.

Reimplemented from Fl_Paged_Device.

## ◆ untranslate()

void Fl_Printer::untranslate | ( | void |  | ) |
| virtual

Undoes the effect of a previous translate() call.

Reimplemented from Fl_Paged_Device.

The documentation for this class was generated from the following files:

- Fl_Printer.H
- Fl_Printer.cxx