� > DrawBasic:Utils

=� =======================================================
�
$� copyright Joe Taylor June 1994
�
;� N.B. For ERROR THROWBACK to work The first line above
7�      MUST have the correct pathname of this file.
	;�      If you move the location of the file remember to

�      alter this pathname.
�
=� =======================================================



P� **************************************************************************
�
� 1. SETTING UP A DRAW FILE
�
P� **************************************************************************

� =======================
� 1.1 Memory Manipulation
� =======================

� �FreeSlot
- � --------------------------------------
 �
- � Allocates 'Free' slot for data storage
 �
# � Called in Library setup file
 �
 - � --------------------------------------
! � Buffer%,Free_Size%
", ș "Wimp_SlotSize",-1,-1 � ,,Free_Size%
# � Free_Size%<32 �
$  � � �
%   ș "Wimp_CommandWindow",-1
&N  � � 0,"DrawBasic needs a non-empty 'Free' slot to save Draw file output"
'  �
(6 � Free_Size%>1024*1024*4 � Free_Size%=1024*1024*4
) Buffer%=�
* �=Buffer%+Free_Size%
+ !Buffer%=Buffer%+8
,"  Buffer%!4=Buffer%+Free_Size%
-=Buffer%
.
/� �Draw_AddWord(x%)
0, � -------------------------------------
1 �
2& � Adds the word (4 bytes) x% to a
3 � "formatted" word array.
4 �
5  � The "pointer" is updated.
6 �
7, � -------------------------------------
8+ � (!�)>=(!(�+4)) � � 0,"Out of memory"
9: !(!�)=x%  : � write word to file at next free address
:3 !�+=4     : � update pointer to next free byte
; �
<
=� �Draw_AddFloat(x)
>, � -------------------------------------
? �
@% � Adds the floating-point number
A � (5 or 8 bytes) x .
B �
C  � The "pointer" is updated.
D �
E, � -------------------------------------
F- � (!�)+4>=(!(�+4)) � � 0,"Out of memory"
G5 |(!�)=x   : � write to file at next free address
H3 !�+=8     : � update pointer to next free byte
I �
J
K"� �Draw_AddString(pointer%,x$)
L2 � -------------------------------------------
M �
N1 � Adds string x$ to a "formatted" word array
O � and adds a CHR$0.
P �
Q/ � String is now aligned with word boundary
R �
S1 � ------------------------------------------
T
 � _a%
U _a%=�x$
V6 � (!pointer%+_a%)>=(!(�+4)) � � 0,"Out of memory"
W1 � (_a%�4)<>0 �  x$+=�4-(_a%�4),�0) : _a%=�x$
X $(!pointer%)=x$
Y !pointer%+=_a%
Z �
[
\� �Draw_AddCoords(x,y)
]2 � -------------------------------------------
^ �
_ � Adds coordinates (x,y)
` �
a �
b1 � ------------------------------------------
c �Draw_AddWord(�Draw_X(x))
d �Draw_AddWord(�Draw_Y(y))
e �
f
g$� �MoveMemory(address%,n_words%)
h* � -----------------------------------
i �
j) � Moves n_words% upwards starting at
k � address%
l �
m* � -----------------------------------
n( � _i%,_n% : _n%=4*n_words% : _i%=!�
o8 � address%+_n%>=(!(�+4)) � � 0,"Not enough memory!"
p ȕ _i%>address%
q  _i%-=4
r  _i%!_n%=!_i%
s  �
t
  !�+=_n%
u�
v
w� �ObjectType(path)
x%� path>=!(�+4) �=!(!path) �=!path
y
z� ========================
{� 1.2 Creating A Draw File
|� ========================
}
~� �BeginDrawing
 � ---------------------
� �
� � Sets up "new" drawing
� �
� � ---------------------
� �Draw_SetUp
� �Draw_SetFileHeader
� �Draw_SetFontTable
��
�
�� �Draw_SetUp
�, � _scale%  : _scale%=�(180*256/2.54+.5)
�F �Draw_AddWord(0)                      : � 8  Address of Draw File
�O �Draw_AddWord(0)                      : � 12 Origin x         (Draw units)
�J �Draw_AddWord(0)                      : � 16 Origin y              ""
�J �Draw_AddWord(12*_scale%)             : � 20 Frame_size width      ""
�J �Draw_AddWord(12*_scale%)             : � 24 Frame_size height     ""
�O �Draw_AddFloat(0)                     : � 28 Frame Coords a   (User units)
�J �Draw_AddFloat(0)                     : � 36 Frame Coords u        ""
�J �Draw_AddFloat(12)                    : � 44 Frame Coords width    ""
�J �Draw_AddFloat(12)                    : � 52 Frame Coords height   ""
�7 �Draw_AddWord(_scale%)                : � 60 Units
�
�> �Draw_AddWord(0)                      : � 64 Current path
�A �Draw_AddWord(0)                      : � 68 Current subpath
�
�= �Draw_AddWord(0)                      : � 72 Symbol type
�> �Draw_AddWord(0)                      : � 76 Dash pattern
�= �Draw_AddWord(12)                     : � 80 Symbol size
�
�J �Draw_AddWord(14*640)                 : � 84 Text Font size  (points)
�= �Draw_AddWord(0)                      : � 88 Text colour
�> �Draw_AddWord(1)                      : � 92 Current Font
�
�; �Draw_AddWord(1<<16)                  : � 96 Translate
�2 �Draw_AddWord(0)                      : � 100
�2 �Draw_AddWord(0)                      : � 104
�2 �Draw_AddWord(1<<16)                  : � 108
�2 �Draw_AddWord(256*90)                 : � 112
�2 �Draw_AddWord(256*90)                 : � 116
�
�A �Draw_AddWord(_scale%)                : � 120 Cms/Draw units
�
�= �Draw_AddWord(1<<16)                  : � 124 Axes width
�G �Draw_AddWord((3<<16)+3)              : � 128 Axes Cap Point/width
�C �Draw_AddWord(0)                      : � 132 Axes Extend (0%)
�
�= �Draw_AddWord(1)                      : � 136  Nx scales
�= �Draw_AddWord(0)                      : � 140  nx scales
�= �Draw_AddWord(1)                      : � 144  Ny scales
�= �Draw_AddWord(0)                      : � 148  ny scales
�= �Draw_AddWord(10)                     : � 152  Lx scales
�= �Draw_AddWord(7)                      : � 156  lx scales
�= �Draw_AddWord(10)                     : � 160  Ly scales
�= �Draw_AddWord(7)                      : � 164  ly scales
�= �Draw_AddWord(1<<16)                  : � 168  Wx scales
�= �Draw_AddWord(1<<15)                  : � 172  wx scales
�= �Draw_AddWord(1<<16)                  : � 176  Wy scales
�= �Draw_AddWord(1<<15)                  : � 180  wy scales
�
�I �Draw_AddWord(1<<16)                  : � 184  REM Current Transform
�2 �Draw_AddWord(0)                      : � 188
�2 �Draw_AddWord(0)                      : � 192
�2 �Draw_AddWord(1<<16)                  : � 196
�2 �Draw_AddWord(0)                      : � 200
�2 �Draw_AddWord(0)                      : � 204
�
�C �Draw_AddWord(10000)                  : � 208 Max x resolution
�C �Draw_AddWord(100)                    : � 212 Min x resolution
�I �Draw_AddWord(300)                    : � 216 V resolution dots/inch
�
�C �Draw_AddWord(4)                      : � 220 Bar chart scales
�> �Draw_AddWord(0)                      : � 224 Line Colour
�H �Draw_AddWord(-1)                     : � 228 Fill Colour (no fill)
�= �Draw_AddWord(0)                      : � 232 Line Width
�= �Draw_AddWord(0)                      : � 236 Line style
�? �Draw_AddWord(0)                      : � 240 Chart factor
�: �Draw_AddWord(0)                      : � 244      ""
� |(�+240)=5/6
�
�> !(�+8)=!�                        : � Address of Draw file
��
�
�� �Draw_SetFileHeader
� �
�# � --------40 bytes------------
� �
�0 �Draw_AddString(�,"Draw")         : � Title
�B �Draw_AddWord(201)                    : � major format number
�B �Draw_AddWord(0)                      : � minor format number
�8 �Draw_AddString(�,"DrawBasic   ") : � Program Title
�: �Draw_AddWord(0)                      : � BoundingBox
�: �Draw_AddWord(0)                      : � BoundingBox
�: �Draw_AddWord(256*180*12*3*800)       : � BoundingBox
�: �Draw_AddWord(256*180*12*3*800)       : � BoundingBox
��
�
�� �Draw_SetFontTable
�8 � -------------------------------------------------
� �
�8 � This procedure should not be called in a program.
�) � It is used  to set the Font table.
� �
�8 � -------------------------------------------------
�" � _fonts% : _fonts%=!(�+8)+40
�= �Draw_AddWord(0)                  : � Font object type 0
�= �Draw_AddWord(0)                  : � Font object length
�. �Draw_AddString(�,�1+"Trinity.Medium"+�0)
�< !(_fonts%+4)=!�-_fonts%          : � Font object length
��
�
�� ========================
�� 1.3 Saving A Draw File
�� ========================
�
�� �Quit
�> � -------------------------------------------------------
� �
�, � Saves Draw file to DrawBasic:DrawFile
� �
�< � The file is then *Run so it will be loaded into !Draw
� �
�> � -------------------------------------------------------
�7 � !(�+68)<>0 � � 0,"Paths must end with 'PathEnd'"
�* *Set Draw_Basic$Path <Wimp$ScrapDir>.
�9 �("Save Draw_Basic:DrawFile "+�~(!(�+8))+" "+�~(!�))
�* *SetType Draw_Basic:DrawFile DrawFile
�# *Filer_Run Draw_Basic:DrawFile
��




� ---------

�

� 1.4 Units

�

� ---------



� �Units=!(�+60)



	� �Centimetres


!(�+60)=�(256*180/2.54+.5)

�FrameSize(0,0,12,12)

�FrameCoords(0,12,0,12)


�Preview

�




� �Inches

!(�+60)=256*180

�FrameSize(0,0,6,6)

�FrameCoords(0,6,0,6)

�Preview

�



"� �DrawUnits(a)=�(�Units*a+.5)



"� �FrameSize(a,b,width,height)

2 � -------------------------------------------

 �

0 � Defines the size of the  drawing "frame".

 �

1 � ------------------------------------------

# �FrameCoords(0,width,0,height)

 9  !(�+20)=�DrawUnits(width)  : � Bounding box - width

!:  !(�+24)=�DrawUnits(height) : � Bounding box - height

",  !(�+12)=�DrawUnits(a)      : � Frame_x

#,  !(�+16)=�DrawUnits(b)      : � Frame_y

$�

%

& � �ReduceFrameSize(fraction)

'
� _w%,_h%

(;_w%=�(!(�+20)*fraction+.5) : _h%=�(!(�+24)*fraction+.5)

)"!(�+12)+=�((!(�+20)-_w%)/2+.5)

*"!(�+16)+=�((!(�+24)-_h%)/2+.5)

+!(�+20)=_w% : !(�+24)=_h%

,�

-

.1� �GetFrameSize(� a%,� b%,� width%,� height%)

/2 � -------------------------------------------

0 �

1. � Gives the size of the  drawing "frame".

2 �

31 � ------------------------------------------

4  width%=!(�+20)

5  height%=!(�+24)

6  a%=!(�+12)

7  b%=!(�+16)

8�

9

:� -----------------

;�

<� 1.5 Co-ordinates

=�

>� -----------------

?

@� �Frame_x=!(�+12)

A� �Frame_y=!(�+16)

B� �Frame_Width=!(�+20)

C� �Frame_Height=!(�+24)

D

E� �FRAME_x=|(�+28)

F� �FRAME_y=|(�+36)

G� �FRAME_Width=|(�+44)

H� �FRAME_Height=|(�+52)

I

J(� �X_Scale=�Frame_Width/�FRAME_Width

K*� �Y_Scale=�Frame_Height/�FRAME_Height

L

M� �Epsilon=1/�Y_Scale

N

O� �MaxNoofPoints=!(�+208)

P� �MinNoofPoints=!(�+212)

Q� �DotsPerInch=!(�+216)

R

S5� �Draw_X(x)=�(�Frame_x+(x-�FRAME_x)*�X_Scale+.5)

T5� �Draw_Y(y)=�(�Frame_y+(y-�FRAME_y)*�Y_Scale+.5)

U

V� �FrameCoords(a,b,u,v)

W2 � -------------------------------------------

X �

Y0 � The bounding box in the (x,y) plane which

Z. � contains the drawing is a<x<b , u<y<v .

[ �

\ �

]1 � ------------------------------------------

^ � _frame%

_ _frame%=�+28

`7 � a>=b � � 0, �a+" < x < "+�b+" is a bad x range "

a7 � u>=v � � 0, �u+" < y < "+�v+" is a bad y range "

b' |(_frame%)=a      : |(_frame%+8)=u

c* |(_frame%+16)=b-a : |(_frame%+24)=v-u

d �

e

f� �OutsideFrame(x,y)

g� _a,_b,_u,_v

h �GetFrameCoords(_a,_b,_u,_v)

i3=-((x<_a)<<3)�-((x>_b)<<2)�-((y<_u)<<1)�-(y>_v)

j

k� �InFrame(x,y)

l!� �OutsideFrame(x,y) � =� �=�

m

n&� �GetFrameCoords(� a,� b,� u,� v)

o2 � -------------------------------------------

p �

q0 � The bounding box in the (x,y) plane which

r. � contains the drawing is a<x<b , u<y<v .

s �

t �

u1 � ------------------------------------------

v � width,height

w#     a=|(�+28) :      u=|(�+36)

x# width=|(�+44) : height=|(�+52)

y b=a+width : v=u+height

z �

{

|� �ShowFrame

}2 � -------------------------------------------

~ �

0 � The bounding box in the (x,y) plane which

�. � contains the drawing is a<x<b , u<y<v .

� �

� �

�1 � ------------------------------------------

� � _path%,_a,_b,_u,_v

�"  �GetFrameCoords(_a,_b,_u,_v)

�*  _path%=�Rectangle(_a,_u,_b-_a,_v-_u)

�  �Fill@(_path%,1)

�  �DrawPath(_path%)

��

�

�� �Origin(A,B)

� � --------------

� �

� � Changes origin

� �

� � --------------

� � _a,_b,_u,_v

�! �GetFrameCoords(_a,_b,_u,_v)

�& �FrameCoords(_a-A,_b-A,_u-B,_v-B)

��

�

�

�� -------------------

��

�� 1.6 Preview Screen

��

�� -------------------

�

�� �DrawDx=!(�+112)

�

�� �DrawDy=!(�+116)

�

�� �DrawTrans=�+96

�

�� �Preview

�( � ---------------------------------

� �

�* � Draws any paths also to screen with

� � a white background

� �

�( � ---------------------------------

�
 � 26 : �

�& � _h,_max%,_x%,_y%,_I%,_font%,_n$

�$ �DrawPreviewBorders(3000,12,8) 

� �DrawPreviewHScales(3000)

� �DrawPreviewVScales(3000)

� �DrawPreviewTitle(14,7)

��

�

�.� �DrawPreviewBorders(max%,point%,colour%)

�� Draw Borders

�point%=point%*16

�.ș "ColourTrans_SetGCOL",�DesktopColour(2)

�ȓ Ȑ 0,0,�DrawDy>>8,max%

�ȓ Ȑ 0,0,max%,�DrawDx>>8

�.ș "ColourTrans_SetGCOL",�DesktopColour(7)

�+� �DrawDx>>8,�DrawDy>>8,max%,�DrawDy>>8

�+� �DrawDx>>8,�DrawDy>>8,�DrawDx>>8,max%

�9ș "Font_FindFont",,"Trinity.Medium"+�0,point%,point%

�Qș "ColourTrans_SetFontColours",,�DesktopColour(2),�DesktopColour(colour%),14

��

�

�'� �DrawPreviewTitle(point%,colour%)

�� _n$,_f$,i%

�0_f$=�ReadSystemVariable("DrawBasic$Options")

�.i%=�_f$,":") : � i%<>0 � _f$=�_f$,�_f$-i%)

�point%=point%*16

� _n$="DrawBasic "+�Leaf(_f$) 

�:� �Units=256*180 �  _n$+=" (Inches)"  �  _n$+=" (Cms)"

�9ș "Font_FindFont",,"Trinity.Medium"+�0,point%,point%

�Qș "ColourTrans_SetFontColours",,�DesktopColour(2),�DesktopColour(colour%),14

�%ș "Font_Paint",,_n$,%10000,16,12

��   

�

�$� �ReadSystemVariable(variable$)

��

�"� ----------------------------

�"�  Reads the value of a string

��  system variable

�"� ----------------------------

��

�� _len%,_variable%

�� _variable% 256

�<ș "OS_ReadVarVal",variable$,_variable%,256,,3 � ,,_len%

�_variable%?_len%=13

�=$_variable%

�

�� �Leaf(x$)

�� _i% : _i%=�x$,".")

�&� _i%=0 �=x$ �=�Leaf(�x$,�x$-_i%))

�

�� �DrawPreviewHScales(max%)

�� Draw Scales

�� _h,_x%,_I%,_dx%,_dy%

�>_I%=0  : _h%=�Units>>8 :_dx%=�DrawDx>>8 :  _dy%=�DrawDy>>8

�"� : _x%=_dx%+(�Draw_Y(_I%)>>8)

� � _x%,_dy%,_x%,3*_dy%/4

�( � _x%+_h%/2,_dy%,_x%+_h%/2,7*_dy%/8

�0 ș "Font_Paint",,�(_I%),%10000,_x%-8,_dy%/2

� _I%+=1

� � _x%>max%

��

�

�� �DrawPreviewVScales(max%)

�� _h,_y%,_I%,_dx%,_dy%

�=_I%=0 : _h%=�Units>>8 :_dx%=�DrawDx>>8 :  _dy%=�DrawDy>>8

�"� : _y%=_dy%+(�Draw_X(_I%)>>8)

� �  _dx%,_y%,3*_dx%/4,_y%

�) �  _dx%,_y%+_h%/2,7*_dx%/8,_y%+_h%/2

� � _I%>9 �

�.  ș "Font_Paint",,�(_I%),%10000,36,_y%-10

� �

�.  ș "Font_Paint",,�(_I%),%10000,48,_y%-10

� �

� _I%+=1

� � _y%>max%

��

�
�

00000000  0d 00 01 17 f4 20 3e 20  44 72 61 77 42 61 73 69  |..... > DrawBasi|
00000010  63 3a 55 74 69 6c 73 0d  00 02 04 0d 00 03 3d f4  |c:Utils.......=.|
00000020  20 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  | ===============|
00000030  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |================|
*
00000050  3d 3d 3d 3d 3d 3d 3d 3d  0d 00 04 05 f4 0d 00 05  |========........|
00000060  24 f4 20 63 6f 70 79 72  69 67 68 74 20 4a 6f 65  |$. copyright Joe|
00000070  20 54 61 79 6c 6f 72 20  4a 75 6e 65 20 31 39 39  | Taylor June 199|
00000080  34 0d 00 06 05 f4 0d 00  07 3b f4 20 4e 2e 42 2e  |4........;. N.B.|
00000090  20 46 6f 72 20 45 52 52  4f 52 20 54 48 52 4f 57  | For ERROR THROW|
000000a0  42 41 43 4b 20 74 6f 20  77 6f 72 6b 20 54 68 65  |BACK to work The|
000000b0  20 66 69 72 73 74 20 6c  69 6e 65 20 61 62 6f 76  | first line abov|
000000c0  65 0d 00 08 37 f4 20 20  20 20 20 20 4d 55 53 54  |e...7.      MUST|
000000d0  20 68 61 76 65 20 74 68  65 20 63 6f 72 72 65 63  | have the correc|
000000e0  74 20 70 61 74 68 6e 61  6d 65 20 6f 66 20 74 68  |t pathname of th|
000000f0  69 73 20 66 69 6c 65 2e  0d 00 09 3b f4 20 20 20  |is file....;.   |
00000100  20 20 20 49 66 20 79 6f  75 20 6d 6f 76 65 20 74  |   If you move t|
00000110  68 65 20 6c 6f 63 61 74  69 6f 6e 20 6f 66 20 74  |he location of t|
00000120  68 65 20 66 69 6c 65 20  72 65 6d 65 6d 62 65 72  |he file remember|
00000130  20 74 6f 0d 00 0a 1f f4  20 20 20 20 20 20 61 6c  | to.....      al|
00000140  74 65 72 20 74 68 69 73  20 70 61 74 68 6e 61 6d  |ter this pathnam|
00000150  65 2e 0d 00 0b 05 f4 0d  00 0c 3d f4 20 3d 3d 3d  |e.........=. ===|
00000160  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |================|
*
00000190  3d 3d 3d 3d 0d 00 0d 04  0d 00 0e 04 0d 00 0f 50  |====...........P|
000001a0  f4 20 2a 2a 2a 2a 2a 2a  2a 2a 2a 2a 2a 2a 2a 2a  |. **************|
000001b0  2a 2a 2a 2a 2a 2a 2a 2a  2a 2a 2a 2a 2a 2a 2a 2a  |****************|
*
000001e0  2a 2a 2a 2a 2a 2a 2a 2a  2a 2a 2a 2a 0d 00 10 05  |************....|
000001f0  f4 0d 00 11 1f f4 20 31  2e 20 53 45 54 54 49 4e  |...... 1. SETTIN|
00000200  47 20 55 50 20 41 20 44  52 41 57 20 46 49 4c 45  |G UP A DRAW FILE|
00000210  0d 00 12 05 f4 0d 00 13  50 f4 20 2a 2a 2a 2a 2a  |........P. *****|
00000220  2a 2a 2a 2a 2a 2a 2a 2a  2a 2a 2a 2a 2a 2a 2a 2a  |****************|
*
00000260  2a 2a 2a 2a 2a 0d 00 14  04 0d 00 15 1d f4 20 3d  |*****......... =|
00000270  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |================|
00000280  3d 3d 3d 3d 3d 3d 0d 00  16 1d f4 20 31 2e 31 20  |======..... 1.1 |
00000290  4d 65 6d 6f 72 79 20 4d  61 6e 69 70 75 6c 61 74  |Memory Manipulat|
000002a0  69 6f 6e 0d 00 17 1d f4  20 3d 3d 3d 3d 3d 3d 3d  |ion..... =======|
000002b0  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |================|
000002c0  0d 00 18 04 0d 00 19 0f  dd 20 a4 46 72 65 65 53  |......... .FreeS|
000002d0  6c 6f 74 0d 00 1a 2d 20  f4 20 2d 2d 2d 2d 2d 2d  |lot...- . ------|
000002e0  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
*
00000300  0d 00 1b 06 20 f4 0d 00  1c 2d 20 f4 20 41 6c 6c  |.... ....- . All|
00000310  6f 63 61 74 65 73 20 27  46 72 65 65 27 20 73 6c  |ocates 'Free' sl|
00000320  6f 74 20 66 6f 72 20 64  61 74 61 20 73 74 6f 72  |ot for data stor|
00000330  61 67 65 0d 00 1d 06 20  f4 0d 00 1e 23 20 f4 20  |age.... ....# . |
00000340  43 61 6c 6c 65 64 20 69  6e 20 4c 69 62 72 61 72  |Called in Librar|
00000350  79 20 73 65 74 75 70 20  66 69 6c 65 0d 00 1f 06  |y setup file....|
00000360  20 f4 0d 00 20 2d 20 f4  20 2d 2d 2d 2d 2d 2d 2d  | ... - . -------|
00000370  2d 2d 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |----------------|
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000039f0  e1 0d 01 f6 04 0d ff                              |.......|
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