A function
graphing utility
This software utility can
plot regular or parametric functions, in
Cartesian or polar coordinate systems, and is
capable to evaluate the roots, minimum and maximum
points as well as the first derivative and the
integral value of regular functions. Easy to
use, ergonomic and intuitive interface, large
graphs are
only a few of the
program features, allowing any
user, from students to experts, to have a nice
experience dealing with this chapter of
mathematics. Moreover, the interface language can be
selected from English, French, Spanish and
Romanian, for now. Several examples to test are
delivered along with this utility and they can
be found in the Functions folder.

The function to plot can be entered in the bottom field
of the program window. It uses a Pascallike
syntax, and the function formula is case insensitive. A
single variable function F, with the real argument x,
may include almost all the mathematic operations and
functions, and it is computed obeying the well known
order of operations. If parametric function is enabled,
a new field for function G is displayed underneath the F's
one. Notice that both function types use the same x
variable for simplicity, no matter the coordinate system
you have set. A new function can be plotted over the old
one (if it wasn't cleared), when the scaling setting
isn't automatic.
Regular functions,
Cartesian coordinate system case:
The function F of one
variable x, real value, is computed and displayed on the
domain x min...x max, having X samples in this interval
(entire X axis  horizontal). The vertical axis has Y
samples, corresponding with the y min...y max domain. If
Automatic scale is enabled, y min and y max are
automatically computed and so they can no longer be
edited. The current point on X axis is determined by the
horizontal mouse position inside the graphic area, and
it can be displayed as a circle, if enabled. The x,F(x)
coordinates are computed on mouse movements over the
graphic, as well as the first function derivative in the
current point. For the x domain you have entered, the
integral value is also numerically computed and
displayed in the right side of the program window. In
this case, the graph can have some visual enhancements, as a
solid filling, normal and antialiased line drawing,
darker color for the negative points and areas.
Regular functions,
polar coordinate system case:
When polar coordinates
are selected, the x argument gets Z values in z min...z
max domain, representing the angle to the horizontal
axis, in radians. The function value for this angle
gives the distance from the pole, and so these polar
coordinates set a point in x min...x max and y min...y
max domains. Automatic scale adjusts the graph size to
the minimum and maximum values of the function F. The
current point of the graph can be displayed as a circle
along the graphic line and it glides forward on z domain
on any mouse movement. If Ctrl is pressed, it'll glide
backward on z domain. Same as before, the x,F(x)
coordinates are computed and shown on mouse movements
over the graphic. Filled and Darker options are not used
in this case.
Any regular function,
having graph on either Cartesian or polar system, can be
saved/loaded to/from a wd1 file. This file type
embeds the formula, the x, y and z domains, plus some
display parameters (color, filling, lines...).
Parametric functions,
Cartesian coordinate system case:
A system of two functions
F and G, of the same real argument (parameter) x, can be
graphically represented as a curve from their values
which are corresponding to points in the XY axes system.
To keep the things simpler, the x argument also gets Z
values in z min...z max domain. If Automatic scale is
enabled, the graphical x and y domains are automatically
computed and so they can no longer be edited. The
current point of the graph can be displayed as a circle
along the graphic line and it glides forward on z domain
on any mouse movement. If Ctrl is pressed, it'll glide
backward on z domain. Same as before, the x value and
F(x),G(x) coordinates are computed and shown on mouse
movements over the graphic. Filled and Darker options
are not used in this case.
Parametric functions,
polar coordinate system case:
This case is similar with
the previous one, the only difference is that the
F(x),G(x) values are now polar coordinates for the
graphic representation. Filled and Darker options are
not used in this case.
Any set of parametric
functions, having graph on either Cartesian or polar
system, can be saved/loaded to/from a wd2 file.
This file type also embeds the formulas, the x, y and z
domains, plus some display parameters (color, filling,
lines...).

Rules for entering functions
The function's formula may contain up to 9 levels of
parentheses and maximum 100 constants. All the trigonometric
functions are considered with their arguments in
radians. The order of operations is the standard
algebraic left to right of:

Functions

Parentheses

Exponents

Unary minus

Multiplication, division

Addition, subtraction
Any function can be
loaded and saved from/to specific text files, containing
the formulas, domains for graph representation and for
argument, as well as some plotting parameters. The file
extensions this program tries to register are wd1
for regular functions and wd2 for parametric ones. So, when this kind of files
are clicked in Windows Explorer, the WinDraw utility is
automatically launched and the function is plotted.
Another way to open a function is to simply drag and
drop its file over the program window. In order to see
some functions and their graphs, just open the Functions
folder from the Start Menu and click on any example file
to run it. When
syntax or overflow errors are generated, you'll be
prompted with an error message telling you what to do
next, and the function string to be edited will change
color. 
Settings
The first two program
options configure the function type, regular or
parametric, and its coordinate system. They are followed
by the graphic options, which are self explanatory. For
regular functions a text report can be generated, if
enabled, containing function data such as formulas,
domains, roots,
maxima and minima, integral
value. It is automatically displayed with the text
associated program (Notepad, WordPad).
WinDraw's default language is English, but you have
several options to choose from. We will try to add other
languages files as soon as possible. 

Mouse and keyboard
commands The
buttons located next to function's fields are self
explanatory; from left to right, you have:
 plot the current
function (same as Enter in function field)
 clear all graphs and
initialize the grid
 save displayed
graphs as bitmap or jpeg picture files
 previous function
(last ten are stored)
 zoom in on the X
axis; if Ctrl is pressed, zoom in on the Y axis
 zoom out on the X
axis; if Ctrl is pressed, zoom out on the Y axis
 this utility's web
page
 settings
page
On the currently displayed
graph, the mouse commands are:
 left button allows
you to move the graph on XY axis (this depends on
Automatic scale setting);
 right button popsup
a menu containing the same commands as the bottom
buttons do;
 the mouse wheel
zooms in or out on X axis; Ctrl changes this to Y
axis;

Graphic options
The XY axes system has a
flexible size, which can be modified by resizing the
program window. Starting from 660 x 500, it can be enlarged
up to 2000 x 1300 pixels. The drawing can be made of
lines or dots, normal size (1pixel wide) or thick (2pixels), using a color selectable from the Color palette.
Regardless of other program settings, the XY axis and the
grid can be independently enabled or prevented from showing.
For a higher contrast during presentations, we have
added the White background option for the displayed
graphics.

Language
Four unicode text files are
located in program's folder, one for each available
language. The file lang_eng contains the program
menus, messages, titles in plain English, and this could
be useful for anyone willing to translate it to a new
language. Notice that the text structure and the number
of lines should be kept as in this document, as well as
the logic and the meaning of some consecutive lines.
Moreover, all the lines have to be short, in order to
fit their program spaces. Do not hesitate to share them
with us for a possible inclusion in the next releases.
Also you can recommend alternate, more accurate
translations for the actual language files our software
has.

Registration
The trial version currently
available for download has a few limitations:

a maximum of 100 different
functions may be displayed

some texts are shown in
the graphic area and in the picture files

PrtScr function is
disabled during the trial period
The current license type
available for purchase is Personal,
meaning that the owner is an individual using one
registered copy of our utility, on a single computer at
a time, for an unlimited period of time. Do not hesitate
to ask us for special license pricing for larger
entities (companies, schools, classes). Any future
upgrades will be free for the registered users. 

Version:
Size:
Updated:
Shareware:
Download:

1.0
1.18MB
1/10/2014
100uses trial
UK host 
Features

fast and easy function
graphing

Cartesian and polar coordinate
system

several program languages

antialiased line drawing

simple mouse operations

flexible graphic window size
Requirements

Windows XP,
Vista, 7 or 8, both 32 or 64 bit

Minimum 1024 x 768 pixel screen resolution

Pentium III 1GHz processor and 256Mb memory
Settings
Colors
Registration
Demo
