Rose
 Volume Number: 3 Issue Number: 1 Column Tag: Assembly Language Lab

# Rose Curve Generator

By Victor Barger, Waunakee, WI

An application of mathematics which produces fascinating designs is the graphing of trigonometric functions using polar coordinates. Each function leads to a beautiful design which bears a strong resemblance to a flower, such as the rose. With its excellent graphics capabilities and superior user interface, the Macintosh is perfect for quickly plotting “rose” functions on the screen with a program simple enough that anyone can use it. The application described in this article takes full advantage of these capabilities to allow the user to experience the graphic beauty of trigonometry.

## Using Rose Curves

After launching Rose Curves, a window will open in the center of the screen and the default function will be drawn inside. (See Figure 1) Both the standard apple menu and a Control menu will be in the menu bar. The apple menu contains the item “About Rose Curves...” and the names of all desk accessories available to the user from the System file. Under the Control menu are two options: Change Parameters and Quit. When the Change Parameters item is selected a window similar to the one in Figure 2 is opened in the center of the screen. With this window the user can select the function to be drawn, choose the size of the drawing and indicate whether the drawing should be multilayered. Function and size are selected by clicking on the appropriate function name or size. For example, selecting cos (sin 100r) gives the design in Figure 3. If multilayered is selected, the function will be drawn at the original size and then shrunk repeatedly to create a “layered” effect, making the design more interesting: See Figure 4.

## Entering the Program

Start up the Macintosh 68000 Development System. The startup disk should be titled ‘MDS1’ and the external disk ‘MDS2.’ The applications Edit, Asm, Link, Exec and RMaker should be on MDS1 and a folder entitled ‘.D Files’ with SysEqu.D, ToolEqu.D, QuickEqu.D, and MacTraps.D inside on MDS2. To make Rose Curves work on a Macintosh 512 with the old ROM, FixMath.Txt and FixMath.Rel must also be in the .D Files folder (The information on where to get these two files is under How Rose Curves Works). FixTraps.Txt and FixTraps.Rel are files which were distributed by Apple Computer under the Apple Software Supplement to aid assembly language programmers in calculating basic arithmetic and trigonometric functions. As the program is presented here, you have everything you need to type the program in and run it on a new ROM machine, since the FixTraps necessary for this program are explicitly defined with the ".TRAPS" statement at the start of the program. The program may also be entered into the new MPW assembler, or assembled with the Consulair C system, which includes the complete MDS assembler built-in.

To create the program, simply assemble the Rose.Asm listing. Then compile the resource file with RMaker. Finally execute the linker on the link file listing and the program object file and resource object file (both ".REL" files) will be linked together, an application generated, and the cute rose application icon should appear on the disk. Double click "Rose Curves" and your in business making fascinating polar coordinate art.

## How Rose Curves Works

The program begins by initializing the standard managers, initializing its variables, setting up the menu bar and opening the window. The initialized variables are Equation, Scale, RealScale, Multilayered and drawn. Equation contains the item number of the selected function in the Change Parameters dialog. To obtain the real equation number, subtract 3 from Equation. Scale is the item number of the selected scale or “size” and RealScale is the actual scalar multiplied on each point before drawing it. Multilayered determines whether the rose will be layered. Finally, drawn is a boolean expression which determines whether the window needs to be updated by redrawing the rose (false) or simply by copying the rose from the offscreen bitmap (true). The offscreen bitmap is also created in this routine. To create a bitmap, create an area in memory with space for a pointer, a word and a rectangle. In Rose Curves, this appears at the end of the program under the label windowBitMap. Now select the rectangle of the bitmap and calculate the rowbytes with the equation

```       rowbytes = int((xright - xleft)/8+1)
```

If rowbytes is odd, round it up. Suppose our rectangle is 0, 0, 50, 96 (remember that a QuickDraw rectangle is stored as y1, x1, y2, x2). Then rowbytes would be 14 and the bitmap would look like this:

```myBitMapDC.L0  ;pointer to bitmap storage
DC14 ;rowbytes
DC0, 0, 50, 96  ;boundsRect
```

The size of the bitmap storage must be determined before it can be created. Use the equation

``` size = rowbytes * (ybottom - ytop)
```

To create the bitmap, use the following routine.

``` move.l #size,D0
_NewPtr;allocate new pointer
lea  myBitMap,A1
move.l A0,(A1)  ;put the pointer to the
;storage in myBitMap
```

To copy a picture from the current window to myBitMap, use this routine

``` pea  aPort(A5)  ;storage for the port
_GetPort ;get the current port
move.l aPort(A5),A0 ;put the port pointer in A0
pea  portBits(A0) ;push ptr to port’s bitmap
pea  myBitMap ;push ptr to our bitMap
pea  srcRect  ;push srcRect
pea  dstRect  ;push dstRect
clr  -(SP) ;srcCopy
_CopyBits;copy the bits
```

Finally, remember to dispose of the bitmap’s storage after finishing with it. This is accomplished simply with

```move.l  myBitMap,A0
_DisposPtr
```

The EventLoop allows desk accessories to perform their periodic events by calling _SystemTask and, if an event occurs, branches to HandleEvent which transfers execution to the appropriate routine: Activate, Update, KeyDown or MouseDown. The Activate routine activates or deactivates the Rose Curves window depending on what the user requested. Update updates the window by either drawing the curve or using _CopyBits, depending on whether the curve had been drawn previously. KeyDown checks if the command-key was down when the KeyDown event occurred by testing bit eight of the ModifyReg. If bit eight equals one, a command-key was pressed and _MenuKey is called to determine the appropriate menuNumber and itemNumber for Choices, the routine which handles menu selections. MouseDown finds the area the mouse was clicked in using _FindWindow and jumps to the appropriate routine to handle the click.

The heart of the program lies in the DrawRose subroutine. Before outlining how it operates, an explanation of the fixed-point math routines is needed. Fixed-point math is not as accurate as floating-point math, but much faster. With graphics programs, speed is often much more important than accuracy, especially when there is the possibility of losing the user’s attention. Since Apple elected not to implement the fixed-point routines into the old toolbox, they released the file's FixTraps. Txt and FixMath.Rel in the Apple Software Supplement of May 6, 1985. These files are available from local user groups, bulletin boards, Apple dealerships or directly from Apple. FixTraps.Txt includes a nice description of the “toolbox additions” and FixMath.Rel contains the actual routines. To use the fixed-point routines on a Macintosh with the old ROM, type ‘INCLUDE FixTraps.Txt’ at the beginning of your .Asm file. Also include the line ‘FixTraps’ after the name of the application under development in the .Link file. To use the fixed-point routines on a Macintosh with the new ROM, simply define the trap using .TRAP at the beginning of the ASM file as we did in our listing here. The complete list of new fixed-point traps is as follows:

Long2Fix \$A83F

FracSin \$A848

FracSqrt \$A849

FracMul \$A84A

FracDiv \$A84B

FixAtan2 \$A818

FixDiv \$A84D

Fix2Long \$A840

Fix2Frac \$A841

Frac2Fix \$A842

Fix2X \$A843

X2Fix \$A844

Frac2X \$A845

X2Frac \$A846

FracCos \$A847

The fixed-point routines support three types of numbers: longint (long integer), fixed, and fract (fractional). Type longint represents integers between ±2147483647, type fixed represents fractional quantities between ±32768 with about 5 digits of accuracy and type fract represents fractional quantities between ±2 with about 9 digits of accuracy. Rose Curves uses _FracSin, _FracCos, _FixMul and _FracMul to perform its arithmetic operations. These routines work like any other toolbox trap: space is cleared on the stack for the result, the parameters are pushed on the stack and the trap is called. The Pascal definitions for these routines are

```function FracSin( x : Fixed ) : Fract
function FracCos( x : Fixed ) : Fract
function FixMul( x, y : Fixed ) : Fixed
function FracMul( x, y : Fract ) : Fract
```

With _FixMul and _FracMul it is possible to pass parameters of different types than specified. For example, one could pass x as type longint and y as type fixed to _FixMul and the result would be type longint. The following table contains the result types for multiplying different types using _FixMul and _FracMul.

_FixMul _FracMul

x y result x y result

fixed fixed fixed fract fract fract

longint fixed longint longint fract longint

fixed longint longint fract longint longint

fract fixed fract fixed fract fixed

fixed fract fract fract fixed fixed

Note: To convert a number to type Fract, multiply it by 65536. To convert a number to type Fixed, multiply it by 32768.

DrawRose begins by changing the cursor to a watch, setting the counter to 721 steps (1 + 360° x 1/increment), the increment to 572 (.5° in fixed-point radians) and the present angle to 0. It then loops until the counter is zero, evaluating the current function (bsr EvalFunction), converting the function result to rectangular coordinates and scaling and centering the points. After completing each layer, the program decreases the scale by 20 and redraws the curve if multilayered was selected. After drawing all of the layers, the variable drawn is set to true and the image in the window is copied onto the offscreen bitmap for future update events.

## Possible Modifications

Rose Curves could be improved in several ways. The most obvious way would be to add more functions to the program. To accomplish this, add the “function” buttons in the Rose.R file and add the subroutines to evaluate the new functions to Rose.Asm. Note that the displacement to the function must be included in the equation table for the new subroutine to be executed. To do this, add the line DC functionLabel-EquationTable after the line DC Six-EquationTable. As more functions are added, keep adding the labels to the equation table. The second improvement would be to decrease the time required to draw the rose when multilayered is on. To do this, copy the image of the rose into an offscreen bitmap using _CopyBits after the first rose has been drawn. Then shrink CopyBits’ dstRect and copy the rose from the offscreen bitmap onto the screen. Although many times faster, this method greatly reduces the accuracy with which layers are drawn since they are being scaled by _CopyBits, not mathematically graphed. An option to this problem would be to include a checkbox in the Change Parameters dialog titled ‘Accurate Multilayers.’ If selected, Rose Curves would draw the layers using its normal drawing routine. If not, Rose Curves would use the copy-and-shrink method, thus giving the user the choice of accuracy or speed.

```;File: Rose.Asm
;---------------------------------------------
;Rose Curves draws curves expressed as a
; function of r and theta.
;Written by Victor Barger on April 2, 1986.
;---------------------------------------------
INCLUDEMacTraps.D
INCLUDEQuickEqu.D
INCLUDEToolEqu.D
;---------------------------------------------
.trap  _FracMul \$A84A  ;New Roms
.trap  _FracCos \$A847
.trap  _FracSin \$A848
;----------------------------------------------
TopButton EQU  D3
BottomButtonEQU  D4
ModifyReg EQU  D4
Increment EQU  D4
Counter EQU D5
CheckBoxEQU D6
FuncResultEQU  A4

ParamDlgIDEQU  2000
DrawWindIDEQU  2001

InitialScaleEQU  13
RealInitScale  EQU 460
;-------------------------------------------------
Start
bsr  InitManagers ;initialize managers
bsr  InitVariables;initialize variables
bsr  SetupWindow;draw the window

EventLoop
clr  -(SP)
move #\$0FFF,-(SP)
pea  EventRecord
_GetNextEvent   ;get the next event
move (SP)+,D0
beq.s  EventLoop;no event, loop back
bsr  HandleEvent;handle the event
beq.s  EventLoop;if 0, continue; else quit
rts

Beep
move #12,-(SP)
_SysBeep
rts
;---------------------------------------------------
InitManagers
pea  -4(A5)
_InitGraf
_InitFonts
move.l #\$0000FFFF,D0
_FlushEvents
_InitWindows
clr.l  -(SP)
_InitDialogs
_TEInit
_InitCursor
rts
;---------------------------------------------------
InitVariables
move #3,Equation(A5)
move #InitialScale,Scale(A5)
move.l #RealInitScale,RealScale(A5)
clr  Multilayered(A5)  ;not multilayered
move.l #11520,D0
_NewPtr;create a new bit map
lea  windowBitMap,A1
move.l A0,(A1)  ;remember the pointer
clr  drawn(A5)  ;not drawn yet
rts
;-----------------------------------------------------
clr.l  -(SP)
move.l (SP),-(SP)
clr  -(SP)
move.l #'DRVR',-(SP)

clr.l  -(SP)
clr  -(SP)

rts
;------------------------------------------------------
SetupWindow
clr.l  -(SP)
move #DrawWindID,-(SP)
pea  WindowStorage(A5)
move.l #-1,-(SP)
_GetNewWindow   ;get the RoseCurves Window
move.l (SP),DrawPtr(A5)
_SetPort ;set the new grafport
rts
;------------------------------------------------------
HandleEvent
move Modify,ModifyReg
move What,D0
move EventTable(D0),D0
jmp  EventTable(D0)

EventTable
DCNextEvent-EventTable
DCMouseDown-EventTable
DCNextEvent-EventTable
DCKeyDown-EventTable
DCNextEvent-EventTable
DCKeyDown-EventTable
DCUpdate-EventTable
DCNextEvent-EventTable
DCActivate-EventTable
DCNextEvent-EventTable
DCNextEvent-EventTable
;-------------------------------------------------------
Activate
move.l DrawPtr(A5),D0
cmp.l  Message,D0 ;was it our window?
bne  NextEvent  ;no, get next event
btst #0,ModifyReg ;activate?
beq  NextEvent  ;no, deactivate

SetOurPort
move.l DrawPtr(A5),-(SP) ;push pointer to draw window
_SetPort ;set our port
bra  NextEvent
;-------------------------------------------------------
Update
move.l Message,D0 ;get the window ptr
cmp.l  DrawPtr(A5),D0
bne  NextEvent

tst  drawn(A5)
bne.s  copyIt
move.l DrawPtr(A5),-(SP) ;push window ptr
_SetPort ;set the port
move.l DrawPtr(A5),-(SP)
_BeginUpdate
move.l DrawPtr(A5),-(SP)
_EndUpdate
pea  windowRect
_EraseRect
bsr  DrawRose   ;draw the rose
bra  NextEvent

copyIt
move.l DrawPtr(A5),-(SP) ;push window ptr
_SetPort ;set the port
move.l DrawPtr(A5),-(SP)
_BeginUpdate
pea  windowBitMap ;get the rose from the bitMap
move.l drawPtr(A5),A0
pea  portBits(A0) ;put the rose in our window
pea  windowRect ;same rect for src and dest
pea  windowRect
clr  -(SP) ;srcCopy
_CopyBits;copy It
move.l DrawPtr(A5),-(SP)
_EndUpdate
bra  NextEvent
;-----------------------------------------------------
KeyDown
btst #8,ModifyReg ;is the command key down?
beq  NextEvent  ;no, exit
clr.l  -(SP)    ;space for menu and item
move Message+2,-(SP);get character
_MenuKey ;see if its a command
bra.s  Choices
;------------------------------------------------------
MouseDown
clr  -(SP) ;space for result
move.l Point,-(SP);get mouse coordinates
pea  WWindow    ;push event window
_FindWindow;find the window
move (SP)+,D0   ;get region number
add  D0,D0 ;*2 for index into table
move WindowTable(D0),D0  ;point to routine offset

WindowTable
DCNextEvent-WindowTable  ;in desk (not used)
DCSystemEvent-WindowTable;in system window
DCNextEvent-WindowTable  ;in content (not used)
DCNextEvent-WindowTable  ;in drag (not used)
DCNextEvent-WindowTable  ;in grow (not used)
DCQuitRoutine-WindowTable;in go away
;-----------------------------------------------------
SystemEvent
pea  EventRecord;ptr to the event record
move.l WWindow,-(SP);push window ptr
_SystemClick    ;let system take care of it
bra  NextEvent  ;next event
;-------------------------------------------------------
clr.l  -(SP)    ;space for menu choice
move.l Point,-(SP);mouse at time of event

Choices
bne.s  NotQuit  ;no
bne.s  NotQuit  ;no, continue
QuitRoutine
move.l DrawPtr(A5),-(SP) ;push ptr to draw window
_CloseWindow    ;close the window
move.l windowBitMap,A0
_DisposPtr ;dispose of the bitmap
move #-1,D0;say it was Quit
rts

NotQuit
beq  ParameterChange;yes

ChoiceReturn
;fall through get next event
;---------------------------------------------------------
NextEvent
moveq  #0,D0    ;say it's not Quit
;--------------------------------------------------------
rts
;--------------------------------------------------------
beq.s  Info

pea  DeskName
_GetItem ;get name of the desk accessory
clr  -(SP)
pea  DeskName
_OpenDeskAcc    ;open the desk accessory
move (SP)+,D0

RestoreOurPort
bsr  SetOurPort
bra  ChoiceReturn

Info
clr  -(SP)
clr.l  -(SP)
move (SP)+,D0
bra  RestoreOurPort
;---------------------------------------------------------
ParameterChange
clr.l  -(SP)
move #ParamDlgID,-(SP)
pea  DStorage
move.l #-1,-(SP)
_GetNewDialog   ;get the dialog
move.l (SP),ParamDlgPtr(A5);preserve the dialogPtr

_SetPort ;set the port

move Equation(A5),TopButton;TopButton = current button
;highlighted in top section
move TopButton,D0
bsr  FindButton ;sub. to return handle
move.l itemHandle(A5),-(SP)
move #1,-(SP)
_SetCtlValue    ;highlight the button

move Scale(A5),BottomButton;BottomButton = current
; button in bottom section
move BottomButton,D0
bsr  FindButton
move.l itemHandle(A5),-(SP)
move #1,-(SP)
_SetCtlValue    ;highlight the button

move Multilayered(A5),CheckBox
move #17,D0
bsr  FindButton ;get handle to check-box
move.l itemHandle(A5),-(SP)
move CheckBox,-(SP)
_SetCtlValue    ;check or uncheck it

RepeatLoop
clr.l  -(SP)
pea  ItemHit
_ModalDialog    ;modal dialog

move ItemHit,D1
cmp  #2,D1 ;was it Cancel?
beq  Done;yes
cmp  #1,D1 ;was it OK?
beq  SetNewParams ;yes
cmp  #9,D1 ;was it in the bottom set?
bge.s  BottomSet;yes

move TopButton,D0
move D1,TopButton ;set new button number
bsr  FindButton ;get handle to last button
move.l itemHandle(A5),-(SP)
clr  -(SP)
_SetCtlValue    ;unhighlight last button

move TopButton,D0
bsr  FindButton
move.l itemHandle(A5),-(SP)
move #1,-(SP)
_SetCtlValue    ;highlight new button
bra.s  RepeatLoop

BottomSet
cmp  #14,D1;in bottom set?
bge.s  CheckForBox;no

move BottomButton,D0
move D1,BottomButton
bsr  FindButton ;get handle to last button
move.l itemHandle(A5),-(SP)
clr  -(SP)
_SetCtlValue    ;unhighlight last button

move BottomButton,D0
bsr  FindButton
move.l itemHandle(A5),-(SP)
move #1,-(SP)
_SetCtlValue    ;highlight new button
bra  RepeatLoop

CheckForBox
cmp  #17,D1;click in the check box?
bne  RepeatLoop
cmp  #1,CheckBox
bne.s  NotOne
move #0,CheckBox
bra.s  SetCheck

NotOne
move #1,CheckBox
SetCheck
move #17,D0
bsr  FindButton ;get handle to check-box
move.l itemHandle(A5),-(SP)
move CheckBox,-(SP)
_SetCtlValue    ;check or uncheck it
bra  RepeatLoop

SetNewParams
clr  drawn(A5)
move TopButton,Equation(A5);set new equation number
move BottomButton,Scale(A5);set new scale
move CheckBox,Multilayered(A5)  ;set multilayered
move Scale(A5),D0
sub  #9,D0
asl.l  #2,D0
move.l ScaleTable(D0),RealScale(A5) ;look up real scale

Done
move.l ParamDlgPtr(A5),-(SP)
_CloseDialog    ;close the dialog
bra  RestoreOurPort

ScaleTable
DC.L 140,220,300,380,460
;------------------------------------------------------
FindButton
move.l ParamDlgPtr(A5),-(SP)
move D0,-(SP)
pea  itemType
pea  itemHandle(A5)
pea  dispRect
_GetDItem;get handle to itemnumber in D0
rts
;-------------------------------------------------------
;to convert a fract number to type fract, multipy by 65536
DrawRose
clr.l  -(SP)
move #4,-(SP)
_GetCursor ;get the watch cursor (ID=4)
move.l (SP)+,D0
move.l D0,A0
move.l (A0),-(SP)
_SetCursor ;set the new cursor

move.l RealScale(A5),-(SP) ;preserve the realScale
DrawRose1
move #720,Counter ;721 steps (360 x 2)
move.l #572,Increment    ;572 = .5° increment in radians
;(.5Π/180)*65536

nextDegree

sub  #14,SP
_FracSin
move.l FuncResult,-(SP)
move.l RealScale(A5),-(SP)
_FixMul;y = y * realScale
_HiWord
move (SP)+,y(A5);y = int(y)

sub  #14,SP
_FracCos
move.l FuncResult,-(SP)
move.l RealScale(A5),-(SP)
_FixMul;x = x * realScale
_HiWord
move (SP)+,x(A5);x = int(x)

move x(A5),D0
move D0,-(SP)   ;x = x + 154

move y(A5),D0
move D0,-(SP)   ;y = y + 144

bne.s  NotFirst
_MoveTo;moveto x,y if first point
bra.s  Skip

NotFirst
_LineTo;else lineto x,y
Skip
dbra Counter,nextDegree  ;loop back
cmp  #1,Multilayered(A5) ;another layer?
bne.s  NoExtraLayers;no
move.l #20,D0
sub.l  D0,RealScale(A5)  ;decrease the real scale by 20
cmp.l  RealScale(A5),D0  ;is the real scale = 20?
bne  DrawRose1  ;no, do next layer

NoExtraLayers
move #1,drawn(A5) ;the rose has been drawn
move.l drawPtr(A5),A0
pea  portBits(A0) ;put the rose in our window
pea  windowBitMap ;get from offscreen bitmap
pea  windowRect ;same size windowRect
pea  windowRect
clr  -(SP) ;srcCopy
_CopyBits;copy the bits
move.l (SP)+,RealScale(A5)
_InitCursor
rts
;----------------------------------------------------
EvalFunction
move Equation(A5),D0
sub  #3,D0
move EquationTable(D0),D0
jmp  EquationTable(D0)

EquationTable
DCOne-EquationTable ;sin 4r
DCTwo-EquationTable ;cos (2 sin r)
DCThree-EquationTable  ;cos (2 sin 2r)
DCFour-EquationTable;cos (sin 100r)
DCFive-EquationTable;cos (sin 8 r)
DCSix-EquationTable ;cos (4 sin 2r)
;-------------------------------------------------------
None
move.l #0,FuncResult
rts
;-------------------------------------------------------
One
;sin 4r
clr.l  -(SP)
asl.l  #2,D0
move.l D0,-(SP)
_FracSin
rts
;-------------------------------------------------------
Two
;cos (2 sin r)
subq #8,SP
_FracSin
move.l (SP),D0
asr.l  #7,D0
asr.l  #6,D0    ;convert to fixed x 2
move.l D0,(SP)
_FracCos
move.l (SP)+,FuncResult  ;fn r(Radians) = cos (2 sin r)
rts
;--------------------------------------------------------
Three
;cos (2 sin 2r)
subq #8,SP
asl.l  #1,D0
move.l D0,-(SP)
_FracSin
move.l (SP),D0
asr.l  #7,D0
asr.l  #6,D0    ;convert to fixed x 2
move.l D0,(SP)
_FracCos
move.l (SP)+,FuncResult  ;fn r(Radians) = cos (2 sin 2r)
rts
;-------------------------------------------------------
Four
;cos (sin 100r)
sub  #12,SP
move.l #3276800,-(SP)
_FixMul
_FracSin
move.l (SP),D0
asr.l  #7,D0
asr.l  #7,D0    ;convert to fixed
move.l D0,(SP)
_FracCos
move.l (SP)+,FuncResult  ;fn r(Radians) = cos (sin 100r)
rts
;--------------------------------------------------------
Five
;cos (sin 8 r)
subq #8,SP
asl.l  #3,D0
move.l D0,-(SP)
_FracSin
move.l (SP),D0
asr.l  #7,D0
asr.l  #7,D0
move.l D0,(SP)
_FracCos
move.l (SP)+,FuncResult  ;fn r(Radians) = cos (sin 8r)
rts
;---------------------------------------------------------
Six
;cos (4 sin 2r)
subq #8,SP
asl.l  #1,D0
move.l D0,-(SP)
_FracSin
move.l (SP),D0
asr.l  #7,D0
asr.l  #5,D0
move.l D0,(SP)
_FracCos
move.l (SP)+,FuncResult  ;fn r(Radians) = cos (4 sin 2r)
rts
;------------------ Local Variables -----------------
EventRecord
What:  DC0
Message: DC.L 0
When:  DC.L0
Point: DC.L0
Modify:DC0
WWindow: DC.L 0

windowRectDC0,0,288,308
windowBitMapDC.L 0
DC40
DC0,0,288,308

ItemHit DC0
itemTypeDC0
dispRectDC0,0,0,0
DStorageDCB DWindLen,0
DeskNameDCB 16,0
;-------------- Application Globals ----------------
WindowStorage  DSWindowSize ;storage for draw window
DrawPtr DS.L1    ;pointer to draw window
EquationDS1 ;equation number
Scale   DS1 ;scale
RealScale DS.L 1 ;longint real scale
MultiLayeredDS 1 ;multilayered (0 = false, 1 = true)
ParamDlgPtr DS.L 1 ;pointer to the parameter dialog
itemHandleDS.L 1 ;itemHandle
yDS1    ;y-value
xDS1    ;x-value
drawn   DS1
;--------------------------------------------------------
END
```

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Box Sync gives you a hard-drive in the Cloud for online storage. Note: You must first sign up to use Box. What if the files you need are on your laptop -- but you're on the road with your iPhone? No... Read more
Audio Hijack 3.8.10 - Record and enhance...
Audio Hijack (was Audio Hijack Pro) drastically changes the way you use audio on your computer, giving you the freedom to listen to audio when you want and how you want. Record and enhance any audio... Read more
Direct Mail 6.0.1 - Create and send grea...
Direct Mail is an easy-to-use, fully-featured email marketing app purpose-built for macOS. Create, send, and track great looking email campaigns that get results. Start your newsletter by selecting... Read more

## Latest Forum Discussions

Hopefully Not Jared’s Last Show – The To...
My suspicions from last week were correct, and after my two kids tested positive for Covid last week both my wife and I have now tested positive as well. It seems you just can’t escape this stuff lately. Thankfully the two little ones are pretty... | Read more »
TouchArcade Game of the Week: ‘Micro RPG...
I feel like idle games are one of those perfect fits for the mobile platform. Not that they replace more involved gaming experiences when you’re in the mood for that, but they do fit in alongside other types of games just fine as a “go to" when you... | Read more »
Phantom Blade: Executioners is holding a small-scale technical test that lets players get first dibs on the KungFuPunk action RPG. Offered to selected players only, S-Game’s first Closed Beta Test will provide players with limited edition in-game... | Read more »
New ‘Warhammer 40,000: Tacticus’ Video S...
Back in September Snowprint Studios, who you may know from their previous Legend of Solgard or Rivengard, announced that they’d partnered up with Games Workshop to put out a new tactical game in the Warhammer 40,000 universe titled Warhammer 40,000... | Read more »
Hello gentle readers, and welcome to the SwitchArcade Round-Up for January 28th, 2022. We’ve got a bunch of new releases to look at today, with a few big hitters, a few mid-level diversions, and a healthy supply of compost. Since it’s Friday, we... | Read more »
S-Game has kicked off its first Closed Beta Test for Phantom Blade: Executioners, inviting a selected few to get first dibs on the upcoming KungFuPunk action RPG on mobile. The CBT officially begins this January 28th, and beta testers will receive... | Read more »
‘Infinite Galaxy’ First Anniversary: Cel...
Cultivating a new generation of valiant commanders across 240 countries worldwide, Infinite Galaxy has quenched players’ thirst to explore the vastness of space – and there are only more intergalactic adventures to embark on from here on out. Camel... | Read more »
War and Order: How to brave the cold in...
War and Order's 6th-anniversary celebrations are underway, and all in good time too - this season not only brings about fabulous festivities, but it also lets players experience the harsh winter in an entirely new way. [Read more] | Read more »
‘Hidden Folks+’ Is This Week’s New Apple...
The original Hidden Folks from Adriaan de Jongh is an excellent hidden objects game featuring hand drawn visuals. It is an absolute joy to play, and it has now released on Apple Arcade in the form of Hidden Folks+ () as an App Store great. If you’... | Read more »
Mini Metro’s First Big Update of 2022 Ad...
Last year saw great updates for Dinosaur Polo Club’s Mini Metro (\$3.99) which is also available on Apple Arcade as an App Store Great. | Read more »

## Price Scanner via MacPrices.net

Apple has clearance 2020 13″ MacBook Airs ava...
Apple has clearance, Certified Refurbished, 2020 13″ Intel-based MacBook Airs in stock today starting at only \$719 and up to \$370 off original MSRP. Each MacBook features a new outer case, comes with... Read more
The cheapest iPhones for sale today at Apple...
Apple has restocked Apple Certified Refurbished iPhone 8 models starting at only \$359. Each refurbished iPhone comes with a fresh external case, standard Apple 1-year warranty, and free shipping.... Read more
14″ MacBook Pro with Apple M1 Max CPU now in...
Looking for a new 14″ MacBook Pro with an Apple M1 Max CPU? Stock is finally trickling into Apple resellers. B&H has Silver 14″ M1 Max MacBook Pros in stock today for \$2899 including free 1-2 day... Read more
14″ MacBook Pros with Apple M1 Pro CPUs are i...
Amazon is reporting stock of 14″ MacBook Pros with M1 Pro CPUs today with a \$50 discount. Shipping is free, and delivery is available by February 1st for most configurations. Be sure to make your... Read more
Apple has restocked 13″ M1 MacBook Pros for \$...
Apple has restocked a full line of 13″ M1 MacBook Pros available Certified Refurbished, starting at only \$1099 and up to \$230 off original MSRP. These are the cheapest M1 MacBook Pros for sale today... Read more
Apple’s AirPods Max headphones are on sale fo...
Amazon has Silver, Blue, and Space Gray Apple AirPods Max headphones on sale today for \$100 off MSRP. Shipping is free, and all models are in stock today. Their price is the lowest currently... Read more
Open a new line of service at Verizon and get...
Verizon is giving away 64GB Apple iPhone 12 minis or your choice of an iPhone 11 to customers who choose one of these phones and open a new line of service. Offer is available online only, and no... Read more
Open-box 13″ M1 MacBook Airs now available st...
QuickShip Electronics has open-box return 13″ M1 MacBook Airs in stock and on sale for \$200-\$400 off MSRP on their eBay store right now with free express delivery. According to QuickShip, “The item... Read more
Verizon’s 2022 iPad promo: \$100-\$310 off any...
Verizon has cellular-capable iPads on sale for \$100-\$310 off MSRP when purchased with an Unlimited service plan. Sale price is applied to your account monthly over a 24 or 30 month period, depending... Read more
Sunday Sale: Apple AirPods are on sale for up...
Amazon has Apple AirPods on sale for \$10-\$100 off MSRP today, depending on the model. All are in stock today with free delivery: – AirPods Max headphones (Blue): \$449 \$100 off MSRP – AirPods Max... Read more

## Jobs Board

Registered Nurse (RN) Employee Health PSJH -...
…is calling for a Registered Nurse (RN) Employee Health PSJH to our location in Apple Valley, CA.** We are seeking a Registered Nurse (RN) Employee Health PSJH to be Read more
Systems Administrator - Pearson (United State...
…and troubleshoot Windows operating systems (workstation and server), laptop computers, Apple iPads, Chromebooks and printers** + **Administer and troubleshoot all Read more
IT Assistant Level 1- IT Desktop Support Anal...
…providing tier-1 or better IT help desk support in a large Windows and Apple environment * Experience using IT Service Desk Management Software * Knowledge of IT Read more
Human Resources Business Partner PSJH - Provi...
…**is calling a** **Human Resources Business Partner, PSJH** **to our location in Apple Valley, CA.** **Applicants that meet qualifications will receive a text with Read more
Manager Community Health Investment Programs...
…is calling a Manager Community Health Investment Programs PSJH to our location in Apple Valley, CA.** **Qualified candidates will be invited to do a self-paced video Read more