View source: R/visualization.R

gplot.arrow | R Documentation |

`gplot.arrow`

draws a segment or arrow between two pairs of points; unlike `arrows`

or `segments`

, the new plot element is drawn as a polygon.

gplot.arrow(x0, y0, x1, y1, length = 0.1, angle = 20, width = 0.01, col = 1, border = 1, lty = 1, offset.head = 0, offset.tail = 0, arrowhead = TRUE, curve = 0, edge.steps = 50, ...)

`x0` |
A vector of x coordinates for points of origin |

`y0` |
A vector of y coordinates for points of origin |

`x1` |
A vector of x coordinates for destination points |

`y1` |
A vector of y coordinates for destination points |

`length` |
Arrowhead length, in current plotting units |

`angle` |
Arrowhead angle (in degrees) |

`width` |
Width for arrow body, in current plotting units (can be a vector) |

`col` |
Arrow body color (can be a vector) |

`border` |
Arrow border color (can be a vector) |

`lty` |
Arrow border line type (can be a vector) |

`offset.head` |
Offset for destination point (can be a vector) |

`offset.tail` |
Offset for origin point (can be a vector) |

`arrowhead` |
Boolean; should arrowheads be used? (Can be a vector)) |

`curve` |
Degree of edge curvature (if any), in current plotting units (can be a vector) |

`edge.steps` |
For curved edges, the number of steps to use in approximating the curve (can be a vector) |

`...` |
Additional arguments to |

`gplot.arrow`

provides a useful extension of `segments`

and `arrows`

when fine control is needed over the resulting display. (The results also look better.) Note that edge curvature is quadratic, with `curve`

providing the maximum horizontal deviation of the edge (left-handed). Head/tail offsets are used to adjust the end/start points of an edge, relative to the baseline coordinates; these are useful for functions like `gplot`

, which need to draw edges incident to vertices of varying radii.

None.

Carter T. Butts buttsc@uci.edu

`gplot`

, `gplot.loop`

, `polygon`

#Plot two points plot(1:2,1:2) #Add an edge gplot.arrow(1,1,2,2,width=0.01,col="red",border="black")

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