FLTK 1.3.4
Fl_Printer Class Reference

OS-independent print support. More...

#include <Fl_Printer.H>

Inheritance diagram for Fl_Printer:
Fl_Paged_Device Fl_Surface_Device Fl_Device

Public Member Functions

const char * class_name ()
 Returns the name of the class of this object. More...
 
Fl_Graphics_Driverdriver (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. More...
 
 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. More...
 
void origin (int *x, int *y)
 Computes the page coordinates of the current origin of graphics functions. More...
 
void origin (int x, int y)
 Sets the position in page coordinates of the origin of graphics functions. More...
 
void print_widget (Fl_Widget *widget, int delta_x=0, int delta_y=0)
 Draws the widget on the printed page. More...
 
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. More...
 
int printable_rect (int *w, int *h)
 Computes the width and height of the printable area of the page. More...
 
void rotate (float angle)
 Rotates the graphics operations relatively to paper. More...
 
void scale (float scale_x, float scale_y=0.)
 Changes the scaling of page coordinates. More...
 
void set_current (void)
 Make this surface the current drawing surface. More...
 
int start_job (int pagecount, int *frompage=NULL, int *topage=NULL)
 Starts a print job. More...
 
int start_page (void)
 Starts a new printed page. More...
 
void translate (int x, int y)
 Translates the current graphics origin accounting for the current rotation. More...
 
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. More...
 
virtual ~Fl_Paged_Device ()
 The destructor.
 
- Public Member Functions inherited from Fl_Surface_Device
void driver (Fl_Graphics_Driver *graphics_driver)
 Sets the graphics driver of this drawing surface. More...
 
Fl_Graphics_Driverdriver ()
 Returns the graphics driver of this drawing surface. More...
 
virtual ~Fl_Surface_Device ()
 The destructor. More...
 
- Public Member Functions inherited from Fl_Device
virtual ~Fl_Device ()
 Virtual destructor. More...
 

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. More...
 

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_Devicesurface ()
 The current drawing surface. More...
 
- 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. More...
 
- 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_rect(0, 0, width, height);
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;

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:
    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

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.

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.

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]leftIf non-null, *left is set to the left margin size.
[out]topIf non-null, *top is set to the top margin size.
[out]rightIf non-null, *right is set to the right margin size.
[out]bottomIf non-null, *bottom is set to the bottom margin size.

Reimplemented from Fl_Paged_Device.

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

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

Parameters
[out]xIf non-null, *x is set to the horizontal page offset of graphics origin.
[out]ySame as above, vertically.

Reimplemented from Fl_Paged_Device.

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]xHorizontal position in page coordinates of the desired origin of graphics functions.
[in]ySame as above, vertically.

Reimplemented from Fl_Paged_Device.

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]widgetAny FLTK widget (e.g., standard, custom, window).
[in]delta_xOptional horizontal offset for positioning the widget relatively to the current origin of graphics functions.
[in]delta_ySame as above, vertically.

Reimplemented from Fl_Paged_Device.

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
winThe window from where to capture.
xThe rectangle left
yThe rectangle top
wThe rectangle width
hThe rectangle height
delta_xOptional horizontal offset from current graphics origin where to print the captured rectangle.
delta_yAs above, vertically.

Reimplemented from Fl_Paged_Device.

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.

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
angleRotation angle in counter-clockwise degrees.

Reimplemented from Fl_Paged_Device.

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_xHorizontal dimensions of plot are multiplied by this quantity.
scale_ySame 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.

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.

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]pagecountthe total number of pages of the job (or 0 if you don't know the number of pages)
[out]frompageif non-null, *frompage is set to the first page the user wants printed
[out]topageif 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.

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.

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.


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