Index of /~svobodka/useful/drape2.0
written by Mark Overmars
DRAPE was written to teach people some basic aspects of programming. It
has some resemblance to Logo but DRAPE is completely visually oriented.
Like in Logo, programs in DRAPE create a drawing. A program in DRAPE
consists of a number of commands. There are commands that draw lines and
shapes, commands that move to a particular position, commands that set
properties, like color, line width and size, and control commands, e.g.
to repeat commands, to call procedures, and to test for mouse buttons.
A modern PC, running Windows95 or NT 4.0 or higher is required. The
program requires a screen resolution of 800x600 or higher.
USING AND DISTRIBUTING THE PROGRAM
DRAPE may be used free of charge, in any way, for any purpose. In may be
distributed by any means, provided that the original files as supplied
by the author remain intact and no charge is made other than for
reasonable distribution costs.
DRAPE may be placed on any archive or BBS system.
DRAPE may not be distributed as a component of any commercial product
without a prior license agreement with the author.
INSTALLING THE PROGRAM
To install the program simply unzip the file into any folder you like,
and run it from there. To uninstall, simply remove all files in that
Please read the documentation (it is a Word'95 document that can also be
read using Wordpad). You can also read the documentation on the internet
Here you can also find information about new releases, extra example
programs, lessons, etc.
CONTACTING THE AUTHOR
If you have comments, suggestion, etc. you can send Email to the author:
email@example.com. Please make clear in the subject line that the mail is
CHANGES SINCE VERSION 1.0
- Environments no longer save and restore color or linewidth.
- Changed the file layout, but the program can still read old
files. When saved they will be converted to the new format.
- Two commands were added to set variables (and create your own), and
to test whether boolean expressions are true. This extends the
possibilities of Drape considerably.
- You can now use a number of special variables in the expressions,
like the x and y position, size, angle, etc.
- You can now type in expressions when specifying values. E.g. you
can set the angle to 360/(23-5). A value "random" is a random number
between 0 and 1, so you get a random angle by typing a value
- The sound command can now play midi files.
- You can now view and print your program in a textual form.
- Layout of commands is changed to tabbed pages. Three sets:
easy, normal, and advanced are available.
- An advanced keyboard command with which you can check whether
a particular key was pressed.
- A command to draw rotated text.
- random positions no longer start at the same place each time.
- repeatedly calling another program caused a nested program
error, even when the calls where not nested. This is now
- repeated calling procedures causes a recursion depth error,
even when there was no recursion. This is now corrected.
- Sometimes the program did not correctly skip over a
block (e.g. after a color check). This is now corrected.
- The Exit command did not work correct from within repeated
blocks. This is now corrected.
CHANGES SINCE TEST VERSION 0.9
- the advanced move and line commands now work relative to the
- images you load and programs you call must now be located in the
directory where the program itself is stored
- slightly enlarged the stepsize to make it exaxtly 32 on the
small picture and 64 on the large one. This means that your
drawings get slightly larger
- Push and Pop Environment have been replace by save and restore
environments. They do no longer behave like a stack. You can though
save and restore the environment under a name such that you can
actualy have a number of different environments.
- the size of the cursor is now depending on the current drawing
size. A move or line commands moves you to the cursor tip
- added sound
- added absolute angle, size and position changes
- added the possibility to place images or text without scaling
- added a command to exit the current procedure
- saving the image is now possible when the program is paused
- there is a command now to save the image
- there now is a single-step mode
- catches deep recursion and other errors
- screen button now keeps pressed after running the program
- keeps track of changes and warns the user when a changed program
was not saved
- shows the right default filenames when saving a program.
- changed some of the icons
- you can no longer press the pause button when it is already pressed
- paths for images and programs are no longer stored in full, making
it easier to send such programs to others
- no longer a line is drawn around the image
- picture is cleared when loading a new program and running procedure
is reset to the first one
- increased the waste basket area