G23pm

A simple graphics library ported to perl.

Usage

  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");

Overview

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 development). 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

Releases

11 releases since Debian 3.1 (Sarge); the text changed 10 times.