"Veusz操作手册1：SCI绘图利器Veusz详解"

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Introduction

coordinates given, or in integer values from 1 upward if none are given. Error bars are plotted for each of

the datasets.

Different fill styles can be given for each dataset given. A separate key value can be given for each dataset.

e. key - a box which describes the data plotted. If a key is added to a plot, the key looks for "key" settings of

the other data plotted within a graph. If there any it builds up a box containing the symbol and line for the

plotter, and the text in the "key" setting of the widget. This allows a key to be very easily added to a plot.

The key may be placed in any of the corners of the plot, in the centre, or manually placed. Depending on

the ordering of the widgets, the key will be placed behind or on top of the widget. The key can be filled and

surrounded by a box, or not filled or surrounded.

f. label - a text label places on a graph. The alignment can be adjusted and the font changed. The position of

the label can be specified in fractional terms of the current graph, or using axis coordinates.

g. rect, ellipse - these draw a rectangle or ellipse, respectively, of size and rotation given. These widgets can

be placed directly on the page or on a graph. The centre can be given in axis coordinates or fractional

coordinates.

h. imagefile - draw an external graphs file on the graph or page, with size and rotation given. The centre can

be given in axis coordinates or fractional coordinates.

i. line - draw a line with optional arrowheads on the graph or page. One end can be given in axis coordinates

or fractional coordinates.

j. contour - plot contours of a 2D dataset on the graph. Contours are automatically calculated between the

minimum and maximum values of the graph or chosen manually. The line style of the contours can be chosen

individually and the region between contours can be filled with shading or color.

2D datasets currently consist of a regular grid of values between minimum and maximum positions in x and

y. They can be constructed from three 1D datasets of x, y and z if they form a regular x, y grid.

k. image - plot a 2D dataset as a colored image. Different color schemes can be chosen. The scaling between

the values and the image can be specified as linear, logarithmic, square-root or square.

l. polygon - plot x and y points from datasets as a polygon. The polygon can be placed directly on the page

or within a graph. Coordinates are either plotted using the axis or as fractions of the width and height of

the containing widget.

m. boxplot - plot distribution of points in a dataset.

n. polar - plot polar data or functions. This is a non-orthogonal plot and is placed directly on the page rather

than in a graph.

o. ternary - plot data of three variables which add up to 100 per cent.This is a non-orthogonal plot and is

placed directly on the page rather than in a graph.

Settings: properties and formatting

The various settings of the widgets come in a number of types, including integers (e.g. 10), floats (e.g. 3.14),

dataset names ("mydata"), expressions ("x+y"), text ("hi there!"), distances (see above), options ("horizontal" or

"vertical" for axes).

Veusz performs type checks on these parameters. If they are in the wrong format the control to edit the setting

will turn red. In the command line, a TypeError exception is thrown.

In the GUI, the current page is replotted if a setting is changed when enter is pressed or the user moves to another

setting.

Introduction

The settings are split up into formatting settings, controlling the appearance of the plot, or properties, controlling

what is plotted and how it is plotted.

Default settings, including the default font and line style, and the default settings for any graph widget, can be

modified in the "Default styles" dialog box under the "Edit" menu. Default settings are set on a per-document

basis, but can be saved into a separate file and loaded. A default default settings file can be given to use for new

documents (set in the preferences dialog).

Datasets

Data are imported into Veusz as a dataset. A dataset is imported from a file, entered manually, set via the command

line, or linked to other datasets via an expression or dataset plugin. Each dataset has a unique name in the document.

They can be seen in the dataset browser panel, or in the Data, Edit dialog box. To choose the data to be plotted,

the user usually selects the dataset in the appropriate setting of a widget.

Veusz supports one-dimensional (1D) datasets, which are a list of values with optional error bars. Error bars can

either be symmetric or asymmetric. Veusz also supports two-dimensional (2D) data. A 2D dataset is a grid of

values, with either a fixed spacing in coordinates, or with arbitrary pixel sizes. An n-dimensional (nD) dataset is

an arbitrary matrix of values. These cannot be plotted directly, but subsets can be plotted using python slice syntax

to convert to 1D or 2D datasets.

In addition to simple numeric datasets, Veusz also supports date-time datasets. For details see the sections on

reading data. Also supported are text datasets, which are lists of text strings.

Datasets can either be plain lists of values which are stored within the document, or they can be linked to a file,

so that the values update if the file is reloaded, or they can be linked to other datasets via expressions or dataset

plugins.

Text

Veusz understands a limited set of LaTeX-like formatting for text. There are some differences (for example,

"10^23" puts the 2 and 3 into superscript), but it is fairly similar. You should also leave out the dollar signs. Veusz

supports superscripts ("^"), subscripts ("_"), brackets for grouping attributes are "{" and "}".

Supported LaTeX symbols include: \AA, \Alpha, \Beta, \Chi, \Delta, \Epsilon, \Eta, \Gamma, \Iota, \Kappa, \Lamb-

da, \Mu, \Nu, \Omega, \Omicron, \Phi, \Pi, \Psi, \Rho, \Sigma, \Tau, \Theta, \Upsilon, \Xi, \Zeta, \alpha, \approx,

\ast, \asymp, \beta, \bowtie, \bullet, \cap, \chi, \circ, \cup, \dagger, \dashv, \ddagger, \deg, \delta, \diamond, \divide,

\doteq, \downarrow, \epsilon, \equiv, \eta, \gamma, \ge, \gg, \in, \infty, \int, \iota, \kappa, \lambda, \le, \leftarrow,

\lhd, \ll, \models, \mp, \mu, \neq, \ni, \nu, \odot, \omega, \omicron, \ominus, \oplus, \oslash, \otimes, \parallel,

\perp, \phi, \pi, \pm, \prec, \preceq, \propto, \psi, \rhd, \rho, \rightarrow, \sigma, \sim, \simeq, \sqrt, \sqsubset, \sq-

subseteq, \sqsupset, \sqsupseteq, \star, \stigma, \subset, \subseteq, \succ, \succeq, \supset, \supseteq, \tau, \theta,

\times, \umid, \unlhd, \unrhd, \uparrow, \uplus, \upsilon, \vdash, \vee, \wedge, \xi, \zeta. Please request additional

characters if they are required (and exist in the unicode character set). Special symbols can be included directly

from a character map.

Other LaTeX commands are supported. "\\" breaks a line. This can be used for simple tables. For example "{a\\b}

{c\\d}" shows "a c" over "b d". The command "\frac{a}{b}" shows a vertical fraction a/b.

Also supported are commands to change font. The command "\font{name}{text}" changes the font text is written

in to name. This may be useful if a symbol is missing from the current font, e.g. "\font{symbol}{g}" should

produce a gamma. You can increase, decrease, or set the size of the font with "\size{+2}{text}", "\size{-2}{text}",

or "\size{20}{text}". Numbers are in points.

Various font attributes can be changed: for example, "\italic{some italic text}" (or use "\textit" or "\emph"),

"\bold{some bold text}" (or use "\textbf") and "\underline{some underlined text}".

Example text could include "Area / \pi (10^{-23} cm^{-2})", or "\pi\bold{g}".

Veusz plots these symbols with Qt's unicode support. You can also include special characters directly, by copying

and pasting from a character map application. If your current font does not contain these symbols then you may

get a box character.

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