G2(3pm) User Contributed Perl Documentation G2(3pm)
NAME
G2 - A simple graphics library ported to Perl.
SYNOPSIS
use G2;
$dev1 = newX11 G2::Device(775, 575);
$dev2 = newGD G2::Device("test.png",600,200);
$dev1->rectangle(20,20,150,150);
$dev1->circle(100,150,60);
$dev2->circle(100,150,60);
$dev2->string(100,50,"A circle in a PNG file");
DESCRIPTION
g2 is a simple to use graphics library for 2D graphical applications. This library provides a comprehensive set of functions for
simultaneous generation of graphical output on different types of devices. Presently, following devices are currently supported by g2:
X11, PNG, PostScript (xfig is in developement). One major feature of the g2_library is the concept of virtual devices. An arbitrary number
of physical devices (such as PNG, or X11) can be grouped to create a so-called virtual device. Commands sent to such a virtual devices will
automatically issued to all attached physical devices. This allows for example simultaneous output to a PNG file and a Postscript file. A
virtual device in turn can be attached to another virtual device, allowing to construct trees of devices. Virtual devices can also be
useful when using different user-coordinate systems. E.g. one X11 window showing an overview of a graphical output, and a second window
showing a zoom of a more detailed area of the graphic. Drawing in both windows is performed by one single command to the virtual device.
Please see g2 documentation (C interface) for up to date version.
Exported constants
G2LD
G2_H
G2_VERSION
Exported functions
Creating new devices
"newX11"
"G2::Device::newX11(width,height)" class method
opens an X11 window with width and height of X11 window given in pixels. returns : a new X11 device.
"newPS"
"G2::Device::newPS(filename,paper,orientation)" class method
opens a new PostScript device. file_name: name of PostScript file paper: Paper size (e.g. g2_A4, g2_Letter). See PostScript paper
sizes for a full list of supported sizes. orientation: paper orientation. Either g2_PS_land for landscape or g2_PS_port for
portrait returns : a new PostScript device.
"newGD"
"G2::Device::newGD(filename,width,height,type)" class method
open a new GD device width,height: width and height of the image in pixels filename: name of the output file. type: file type,
0-jpeg, 1-png returns : a new GD device
"newVD"
"G2::Device::newVD()" class method
Create a new Virtual Device. An arbitrary number of physical devices (such as PNG, or X11) can be grouped to create a so-called
virtual device. Commands sent to such a virtual devices will automatically issued to all attached physical devices. This allows for
example simultaneous output to a PNG file and a Postscript file. A virtual device in turn can be attached to another virtual device,
allowing to construct trees of devices. Virtual devices can also be useful when using different user-coordinate systems. E.g. one X11
window showing an overview of a graphical output, and a second window showing a zoom of a more detailed area of the graphic. Drawing
in both windows is performed by one single command to the virtual device.
Device Functions
"" "G2::Device::attach(dev)" object method
"" "G2::Device::detach(dev)" object method
"" "G2::Device::close()" object method
"set_auto_flush"
"G2::Device::set_auto_flush(on_off)" object method
"flush"
"G2::Device::flush()" object method
"save"
"G2::Device::save()" object method
"set_coordinate_system"
"G2::Device::set_coordinate_system(x_origin, y_origin, x_mul, y_mul)" object method
"ld" "G2::Device::ld()" object method
"set_ld"
"G2::Device::set_ld( dev)" object method
"ink"
"G2::Device::ink( pd_dev, red, green, blue)" object method
"pen"
"G2::Device::pen(color)" object method
"set_dash"
"G2::Device::set_dash(N, *dashes)" object method
"set_font_size"
"G2::Device::set_font_size(size)" object method
"set_line_width"
G2::Device::set_line_width(w) object method
"clear_palette"
"G2::Device::clear_palette( dev)" object method
"reset_palette"
"G2::Device::reset_palette( dev)" object method
"allocate_basic_colors"
"G2::Device::allocate_basic_colors( dev)" object method
"clear"
"G2::Device::clear( dev)" object method
"set_background"
"G2::Device::set_background(color)" object method
Drawing Functions
"move"
"G2::Device::move(x, y)" object method
"move_r"
"G2::Device::move_r(dx, dy)" object method
"plot"
"G2::Device::plot(x, y)" object method
"plot_r"
"G2::Device::plot_r(dx, dy)" object method
"line"
"G2::Device::line(x1, y1, x2, y2)" object method
"line_r"
"G2::Device::line_r(dx, dy)" object method
"line_to"
"G2::Device::line_to(x, y)" object method
"poly_line"
"G2::Device::poly_line(N_pt, *pos)" object method
"triangle"
"G2::Device::triangle(x1, y1, x2, y2, x3, y3)" object method
"filled_triangle"
"G2::Device::filled_triangle(x1, y1, x2, y2, x3, y3)" object method
"rectangle"
"G2::Device::rectangle(x1, y1, x2, y2)" object method
"filled_rectangle"
"G2::Device::filled_rectangle(x1, y1, x2, y2)" object method
"polygon"
"G2::Device::polygon(N_pt, *pos)" object method
"filled_polygon"
"G2::Device::filled_polygon(N_pt, *pos)" object method
"circle"
"G2::Device::circle(x, y, r)" object method
"filled_circle"
"G2::Device::filled_circle(x, y, r)" object method
"ellipse"
"G2::Device::ellipse(x, y, r1, r2)" object method
Draw an ellipse on device dev
x,y: center point
r1,r2: x and y radius
"filled_ellipse"
"G2::Device::filled_ellipse(x, y, r1, r2)" object method
Draw a filled ellipse on device dev
x,y: center point
r1,r2: x and y radius
"arc"
"G2::Device::arc(x, y, r1, r2, a1, a2)" object method
Draw an arc with center point at (x,y), x and y radius given by r1,r2 and starting and ending angle in radians a1,a2
"filled_arc"
"G2::Device::filled_arc(x, y, r1, r2, a1, a2)" object method
Draw a filled arc on device dev
x,y: center point
r1,r2: x and y radius
a1,a2: starting and ending angle in radians
"string"
"G2::Device::string(x, y, char *text)" object method
"" "G2::Device::set_QP(d, enum QPshape shape)" object method
"" "G2::Device::plot_QP(x, y)" object method
AUTHORS
Horst Wagner (wagner/users-sourceforge.net) and Ljubomir Milanovic (ljubo/users-sourceforge-net)
COPYRIGHT
Copyright (C) 1998-2001 Ljubomir Milanovic & Horst Wagner This file is part of the g2 library
This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
perl v5.14.2 2011-11-15 G2(3pm)