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- This is !DrawPersp, version 1.24 (28 April 1995)
-
-
- Intro
- =========
- This is essentially a vector program, with which you can create drawfiles.
- Its special feature is that its drawing tools all provide operations, that
- take into account the perspective of a scene.
-
- Perspective
- ============
-
- Perspective is caused by the fact that objects appear smaller, the further
- away they are. This causes vertical, and horizontal surfaces, to scale down
- smaller at greater distance, and if they were continued, would tend to
- disappear, or become infinitessimally small, at an infinite distance away.
- Such a place we call a 'vanishing point'.
-
- A scene in which all buildings are laid out in a true rectangular grid, will
- have two vanishing points, but normally only one will be in a visible area
- of a picture at a time. When they both show a distorted effect can be
- achieved.
-
- If one vanishing point is in the centre of the picture, a drawing of a scene
- looking straight down a straight road can be achieved. If it is placed off
- centre an effect of looking across a road in a slanting way can be made.
-
- Use
- ===
- The best mode for this is 21 or 28. Other modes work but some give
- poorer results.
-
- The select button is used for most operations described below, while with
- one exception adjust provides you with temporary vertical and horizontal
- guides, emanating from the pointer.
-
- The program is installed on the icon bar in the usual way, by clicking on
- the icon in the directory. The drawing window is opened by clicking on this,
- and a white screen, with a toolbox and a small cross in the middle can be
- seen. This cross represents the visible vanishing point. Other vanishing
- points are sited off the screen at infinite distances away each side.
-
- The top icon can be selected and the vanishing point can then be resited. In
- general to get a drawing that looks correct you need to keep it about two
- thirds of the way up the screen. Putting it higher gives the impression of
- looking from on high. Putting it low gives an ant's eye view.
-
- The next icon down is use for rubber banding. This is used as in !Draw, and
- draws in the selected colour. This operation is the only one that does not
- consider perspective; any line can be drawn.
-
- The next icon down draws vertical surfaces. Dragging will only work from top
- to bottom. dragging towards the visible vanishing point, draws a surface,
- that would vanish at that point. Dragging away from it draws a surface that
- would vanish at the other vanishing point, off of the screen. The textures
- sub menu allows you to choose, unfilled, filled, brick, weather board, or
- block. Spacings of these, can be altered from this sub menu too.
-
- The next icon is for drawing horizontal surfaces. Click and drag, to see a
- surface drawn, which tends to disappear the nearer it gets to a vanishing
- point. There is a bug in this, and it pays to drag from bottom left to top
- right if possible. By selecting one of the options in the sub menu, you can
- choose unfilled, filled or paved options. The paved one does not yet, obey
- correct perspective, but looks good. The field texture is not yet
- implemented.
-
- The next icon is for dragging simple lines, that go towards or away from
- vanishing points. This probably won't often be useful, as all lines on a
- picture are really more accurately described as surfaces.
-
- The next icon is for dragging out objects that are not vertical or
- horizontal. This action is used for drawing roofs. Unlike the other tools
- this one has to be dragged once to do the non vertical non horizontal bit.
- The next drag then creates the surface.
-
- The next icon provides the user with a tool to plant fractal trees and
- bushes at the place of the pointer. These trees can't be drawn above the
- vanishing point which would be in the sky. They obey the rules of
- perspective, becoming smaller further away, though their actual size, can
- also be changed from their sub menu as well.
-
- The palette icon is not implemented
-
- However OLE is now working, so in a very satisfying way a click with Ctrl.
- held down, loads the drawing into !Draw, if it is available. This can be
- used to change colours, and delete objects etc.. For those unfamiliar with
- OLE, a Save from !Draw, best achieved by pressing F3 perhaps, will save the
- edited file back into !DrawPersp.
-
- Saving
- ======
-
- This can be accomplished, from the main window menu, in the
- usual way. The
-
- Drawing ======= Users should experiment, with the above tools. Artists who
- understand the rules of perspective, may find it easy, and it may be of use
- to teach perspective. It is limited in several ways, by simplification, and
- it really needs a fast machine, as it is written in basic, and it needs to
- use a high resolution mode.
-
- Future
- ======
- !DrawPersp should include in the future:
-
- Full colour
- More textures
- More fractal options
- Less bugs and more simplifications
-
- Copyright
- =========
- This program is Public Domain. It may be distributed or
- copied freely as long as no part of this software may is used in any other
- program, whether commercial or public domain, without my prior written
- consent, though any files created by this software are not bound by this
- condition. This software may not be distributed for a profit, save that
- required to cover packaging and media costs..
-
- Copyright (©) is retained by the author, who may be contacted at the address
- beneath. No liability can be accepted by the author for any loss or damage
- arising from use or misuse of this software.
-
- The Fractal trees are copyright of RiscUser and used with their permission.
-
- EventShell
- =========
-
- Thanks to Paul Hobbs for his very useful !EventShell System.
-
- This application uses the library of routines of the above name, which
- provide an easy way of genereating a Wimp Program.
-
- I recommend this system which can be obtained from APDL or other PD
- Libraries.
-
- This program has been written using the routines supplied with the EvntShell
- library which is copyright Paul Hobbs. The library routines may be
- distributed subject to the following conditions:
-
- You have permission to use any part or the whole library in a project you
- intend to place in the public domain, as long as I am fully credited (via
- the inclusion of this file in the program documentation). If you wish to use
- these routines in a program that is for sale (for however much and for
- whatever reasons) or released as copyright material then my express
- permission in writing must be obtained. I maintain copyright on all the
- material supplied and reserve the right to amend these conditions in cases
- where I deem misuse.
-
- The library code is supplied free of charge to everyone 'as is'. There is no
- guarantee that it is free from bugs and no warranty is given about its
- suitability for use.
-
- Further details about EvntShell may be obtained from the author:
-
- Paul Hobbs Rheinpfalzstrasse 2 85049 Ingolstadt Germany
-
- The heap manager routines used by EvntShell are copyright Risc User and are
- used with permission.
-
- -----------------------------------------------------------------------------
- Any improvements or bugs, please report to :-
-
- Robert Seago.
-
- 40 Alton Park Road
- Clacton On Sea
- Essex.
-
- CO15 1ED
-