Z. Zhu, S. Ordonez, C. Kasten, May 20003

1
Z. Zhu, S. Ordonez, C. Kasten, May 20003
2
Language Overview

• jGTL is a high-level interpreter language.
• Basic Language functions are implemented in jGTL
  like in C.
• jGTL is focus on 3D graphic transformations, such
  as object scaling, translation, rotation, and
  projection.

3
Major Features

• Simple
• Simple syntax (similar to Java and C) and
  transformation functions.
• Intuitive
• An intuitive approach to 3D graphic
  definition and manipulation.
• Friendly Programming
• Graphical IDE makes coding in jGTL easy and
  convenient for error checking.
• Object-Oriented
• Each defined point, matrix, and group of
  points is represented by an object.

4
Why jGTL?
OpenGL Utility Library (GLU) provides about 150
distinct commands to specify the objects and
operations
The graphics libraries of most popular
languages, such as Borland C and Java, are very
large and complex.
Graphic definitions using Java 3D is complicated
and verbose.
5
Why jGTL?
The jGTL language provides a powerful and simple
approach to 3D graphics programming.
With this object-oriented language and its
graphic development environment, users can
control the geometrical transformation of 3D
objects easily and quickly.

• It is good for the user without much
  computer programming experience and graphical
  knowledge to learn and create complex 3D
  graphical objects.

6
(No Transcript)
7
jGTL Grammar----What this language can do?
BASIC Graphics
8
Data Flow Control if-else
Java-like
If n1lt0 then n2n2n1 n3n22
else n30
9
Iterationfor-loop
Java-like
for(n11 n1lt10 n1n11)
n_fn_fn1
10
System Commands
Graphic output JdrawPoint( ) JdrawLine(
) JdrawConfig( )
Text output JprintLine( ) JprintList ( )
11
Language Components and Interfaces
12
Code StructureIDE
13
Design Features

• Graphic interface IDE

14
Design Features

• Graphic output and Text output

15
Design Features

• Simultaneous help document checking

16
Design Features

• Object-oriented Language
• Compile error report and handle

17
Applications--Sphere Ring
/Draw Double Courves/ for(ni-n_
max_x nilt(n_max_x0.05) nini0.05)
n_parasin(ni3.1416/n_max_x) n_z
n_max_zn_para n_y n_max_yn_para n_cr
0.50.5n_para n_cg0.50.5sin(
(ni/n_max_x1/3)3.1416) n_cb0.50.5sin(
(ni/n_max_x2/3)3.1416)   p1ni, n_y,
-n_z p2-ni, n_y, n_z JdrawPoint(p1,
0.0, n_cg, n_cb, n_r) JdrawPoint(p2, n_cr,
0.0, n_cb, n_r)
18
(No Transcript)
19
Applications--Colorful Circle
for(ni5 nilt360 nini5)
p21JRotate(ni, 1.0, 0.0, 0.0)-gtpt1 n_cr
0.50.5sin(3.1416(ni/1802/3)) n_cg
0.50.5sin(3.1416ni/180)
n_cb0.50.5sin(3.1416(ni/1801/3))
JdrawPoint(pt1, n_cr, n_cg, n_cb, 0.06)
JdrawLine(p0, pt1, n_cr, n_cg, n_cb, 0.04)

20
(No Transcript)
21
(No Transcript)
22
Applications--Body Center Structure NaCl
//Initial B type Points g2 lt gt
n0-n_bondn_bond/2 for(nin0 niltn_bond
ninin_bond) for(njn0 njltn_bond
njnjn_bond) for(nkn0
nkltn_bondnknkn_bond) p_b1ni,
nk, nj g2JAppend(p_b1)-gtg2
//End of for
23
(No Transcript)
24
Applications--Face Center Structure CsCl
25
Applications--S3 Space Group Structure Silicon
/Draw Lines in a lattice Double for
loop/ g_totalJgetSize( )-gtn_total JprintLine
(n_total) for(ni0 niltn_total nini5)
g_totalJgetPoint(ni)-gtp_center for(njni1
njlt(ni4) njnj1)
g_totalJgetPoint(nj)-gtptemp
JdrawLine(p_center, ptemp, 1.0, 0.0, 0.0,
n_r2) //End
26
(No Transcript)
27
(No Transcript)
28
(No Transcript)
29
(No Transcript)
30
Application--Amino Acids Aspartic acid
31
Application--Amino Acids Aspartic
acid-Conformations
32
Application--Amino Acids Aspartic
acid---Backbone Rotomer
33
Software Process and Testing
Phase I Lexer, Parser test 1
Phase II Tree Walker test 2
Phase III Point, Group, Matrix Tree Walker
test 3
Phase IV Graphic Interface
test 4
Phase V Overall Maintenance
test 5- Regression Test
34
Lessons from jGTL Project

• Compiler Implementation
• Difficulties Symbol Table, List Tree walker,
  Language standardization
• Error Handle
• Team Work

35
Thank you!