g2: devices control

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# devices control
[g2 User Interface]

## Functions
void | g2_close (int dev)
void | g2_set_auto_flush (int dev, int on_off)
void | g2_set_coordinate_system (int dev, double x_origin, double y_origin, double x_mul, double y_mul)
int | g2_ld (void)
void | g2_set_ld (int dev)

## Function Documentation

void g2_close | ( | int | dev | ) |

  | Close and delete a device. Parameters:
  | dev | device

int g2_ld | ( | void |  | ) |

| Get the last accessed device. G2LD macro is defined as the g2_ld function.
       g2_open_X11(100, 100);
       g2_plot(G2LD, 50, 50);

void g2_set_auto_flush | ( | int | dev,
|  | int | on_off
| ) |

  | Set auto flush mode for device dev. Auto flush mode means that after each graphical operation g2 library automatically calls flush function to ensure that output is realy displayed. However, freqent flushing decreases performance. Alternative is to flush output when needed by calling g2_flush function. Parameters:
  | dev | device
  | on_off | 1-on 0-off

void g2_set_coordinate_system | ( | int | dev,
|  | double | x_origin,
|  | double | y_origin,
|  | double | x_mul,
|  | double | y_mul
| ) |

  | Set the user coordinate system. Parameters:
  | dev | device
  | x_origin | x coordinate of the new origin (expressed in the default coordinate system)
  | y_origin | x coordinate of the new origin (expressed in the default coordinate system)
  | x_mul | x scaling factor
  | y_mul | y scaling factor

void g2_set_ld | ( | int | dev | ) |

  | Set the last accessed device. See also g2_ld() function. Parameters:
  | dev | device