Projectile Motion (ProjMot V1.01)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
© Copyright 1991 Christian E. Hopps

	ProjMot is a graphing program that plots the path of a projectile in a 
plane in real time. The window is scalable, also velocity, angle and time 
acceleration are user definable.  ProjMot is WB1.3 and 2.0 compatible, and 
the window is sizeable so that you may take advantage of virtual screens in 
WB2.0. Math is done using the built in math library and Mathtrans.library 
both single precision, req.library is also required (V2.5 is supplied with 
archive.)

	This program was basically my attempt to apply some of the physics I 
began to learn this year at college. The program is written in C and was 
compiled with Lattice V5.1.  To save time I used req.library for most 
intuition interfacing. ProjMot is a decent example of writing with math 
functions in C.

	Using the program is easy. You can define the velocity and angle of 
the projectile as it leaves the ground. The initial scale of the display is 
1 pixel = 1 meter. This can be adjusted with the scale gadget, so if you 
want 1 pixel = 1km type 1000 in the scale requester. After running the 
program once with the pixel scale at 1km I decided to add time acceleration 
(Acc. Time) Basically if you type 2 in the Time Acc. requester, things will 
happen twice as fast 10 = 10 times... ProjMot does not account for air 
resistance so if you launch something at 10km / second, it's gonna move!  
The Display is not cleared after each firing so that you can compare 
different settings. Re-sizing the window, clicking the Clear gadget, or 
changing the scale, will clear the display. As of this release ProjMot 
simply brings up a text requester to give you the vitals, ie. distance 
traveled in the x direction, and the time it took.

	All the code and including the graphics are Copyrighted but use for 
educational purposes is granted, also if anyone wants to include parts of 
the code for non-profit projects (Public Domain) feel free, just give 
credit where credit is due. This program is uh..FreeWare.. I think that is 
the name for it, anyway you can't sell it but it can be distributed in Disk 
collections (such as Fred Fish.)

	A executable is included but if you wish to recompile the source, some 
modifications need to be made. First I use two directories, the current one 
and link:, they can be one in the same as long as the current directory has 
the assign "link:" attached to it. "graph.c", "window.h" , and "ggads.h" 
must be in the same directory as well as  "makefile", and "withfile" (the 
current directory), all the rest reside in link: to compile all you type is 
"lmk -a" (for lattice) this will do a full compile using "makefile".  
"withfile" is just a blink WITH file, the argument line grew to large for 
CLI to handle.

	I am asking for no money or anything like that, but if you have 
suggestions or REALLY REALLY want to send a poor college boy some study 
money, you can reach me at:

		Chris Hopps
		1609 Fairview
		Royal Oak, MI.	48073

		UseNet: wsu-cs!ro-chp!chopps

History
~~~~~~~
Version 1.01
	o No none bugs.
		Clip routines need to be enhanced so that the path is drawn to 
		edge of clip region.

Version 1.00
	o Would not work with 68000 or 68010
		I had compiled with 68020 option set in SAS/C options. Simple fix
		recompiled with any processor option set!

Future	(In order. Hopefully all will be included in next release.)
~~~~~~
	o Labels that refresh.
	o X/Y axis graphic into window.
	o Air resistance.
	o Variable Mass (only matters for next two.)
	o Variable elasticity of projectile. (watch it bounce!)
	o Solid boarders to bounce projectile off.