Joystick position

From Rosetta Code
Task
Joystick position
You are encouraged to solve this task according to the task description, using any language you may know.

The task is to determine the joystick position and represent this on the display via a crosshair. For a centred joystick, the crosshair should appear in the centre of the screen. If the joystick is pushed left or right, then the cross hair should move left or right according to the extent that the joystick is pushed.

If the joystick is pushed forward or pulled back, then the crosshair should move up or down according to the extent that that joystick is pushed or pulled. The edges of the display represent maximum extents for joystick movement.

For example, a joystick pushed fully forward would raise the crosshair to the top centre of the screen.

A joystick pulled backwards and to the right would move the crosshair to the bottom right of the screen (except for a small area reserved to show joystick status). Implementations can use a graphical display method to produce the crosshair, or alternatively represent the crosshair using a plus symbol on a terminal, and move the plus symbol position according to the joystick. The bottom part of the display can hide or show an alphanumeric sequence to represent the buttons pressed.

For example, if pushbuttons 1,4 and 10 are depressed, we could display "1 4 A".

The implemented code should continue to redraw the crosshair according to the joystick position and show the current pushbutton statuses until the task is terminated. Digital joysticks that produce no extent data, should have their position indicated as full extent movement of the crosshair.

For the purpose of this task, we assume that the joystick is calibrated and that the first joystick is being used.
The task implementer could at their option provide a solution that includes a joystick selection facility, enabling the user to choose which joystick is to be used for this task.

Applesoft BASIC[edit]

100 GOSUB 400
110 P2 = PDL(2) : IF P2 <> O2 THEN O2 = P2 : VTAB 23 : HTAB 33 : PRINT P2; TAB(37);
120 B2 = FNB(2) : IF B2 <> N2 THEN N2 = B2 : VTAB 24 : HTAB 15 : PRINT P$(B2);
130 P3 = PDL(3) : IF P3 <> O3 THEN O3 = P3 : VTAB 23 : HTAB 37 : PRINT P3; : CALL -868
140 X = INT(P3 * RX) : Y = INT(P2 * RY(F))
150 O = (X1 = X2 AND Y1 = Y2) + 1
160 N = (X = X1 AND Y = Y1) + 1
170 IF X <> X2 OR Y <> Y2 THEN XDRAW N AT X, Y : XDRAW O AT X2, Y2 : X2 = X : Y2 = Y : O = N
200 P0 = PDL(0) : IF P0 <> O0 THEN O0 = P0 : VTAB 22 : HTAB 33 : PRINT P0; TAB(37);
210 B0 = FNB(0) : IF B0 <> N0 THEN N0 = B0 : VTAB 22 : HTAB 15 : PRINT P$(B0);
220 P1 = PDL(1) : IF P1 <> O1 THEN O1 = P1 : VTAB 22 : HTAB 37 : PRINT P1; : CALL -868
230 B1 = FNB(1) : IF B1 <> N1 THEN N1 = B1 : VTAB 23 : HTAB 15 : PRINT P$(B1);
240 X = INT(P0 * RX) : Y = INT(P1 * RY(F))
250 O = (X1 = X2 AND Y1 = Y2) + 1
260 N = (X = X2 AND Y = Y2) + 1
270 IF X <> X1 OR Y <> Y1 THEN XDRAW N AT X, Y : XDRAW O AT X1, Y1 : X1 = X : Y1 = Y
300 K = PEEK(-16384) : IF K < 128 THEN 110
310 POKE-16368,0
320 IF K = 198 OR K = 200 THEN F = PEEK(-16302) ^ 0 : GOTO 110HIDE
330 IF K = 155 OR K = 211 THEN F = PEEK(-16301) * 0 : GOTO 110SHOW
340 TEXT : END
400 HOME : HGR
410 DEF FN B(B) = PEEK(49249 + B) > 127
420 P$(0) = "NOT PRESSED" : P$(1) = "PRESSED "
430 VTAB 21 : PRINT "BUTTON:";
440 PRINT TAB(28); "JOYSTICK:"
450 PRINT " OPEN APPLE "P$(0);
460 PRINT TAB(29); "ONE"
470 PRINT " CLOSED APPLE "P$(0);
480 PRINT TAB(29); "TWO"
490 PRINT TAB(9); "SHIFT "P$(0);
500 RX = 35 / 32 : RY(0) = 5 / 8 : RY(1) = 3 / 4
510 DATA2,0,6,0,3,0,29,15,20,6,0
520 FOR I = 768 TO 778 : READ B
530 POKE I, B : NEXT : POKE 232, 0 : POKE 233, 3
550 ROT = 0 : SCALE = 7 : XDRAW 1 AT X1, Y1
560 O0 = -1 : O1 = O0 : O2 = O0 : O3 = O0
570 RETURN

AutoHotkey[edit]

Works with: AutoHotkey_L
Library: GDIP

Forum thread

Image link

; Uncomment if Gdip.ahk is not in your standard library
; #Include, Gdip.ahk
 
; Comment for lower CPU usage
SetBatchLines, -1
 
JoystickNumber := 0 ; (1-16) or (0 = Auto-detect)
CrosshairSize := 100
BarWidth := 50
BarSpacing := BarWidth + 8
Color1 := 0x99000000
Color2 := 0x99ffffff
Color3 := 0x99ff6600
Color4 := 0xff0066ff
Color5 := 0xffff6600
Font := "Arial"
FontSize1 := 20
FontSize2 := 30
Lineweight1 := 8
Lineweight2 := 3
Lineweight3 := 2
Lineweight4 := 4
Show2ndCrosshair := true
AxisLabelHeight := 47
 
#SingleInstance, Force
#NoEnv
OnExit, Exit
SysGet, MWA, MonitorWorkArea
CrosshairOffset := CrosshairSize // 2
, CircleOffset := CrosshairOffset - 5
, CircleSize := CrosshairSize - 10
, TaskBarHeight := A_ScreenHeight - MWABottom + Lineweight1 // 2
, ScaleX := A_ScreenWidth / 100
, ScaleY1 := (A_ScreenHeight - TaskBarHeight - AxisLabelHeight) / 100
, ScaleY2 := A_ScreenHeight / 100
, BarCenter := (MWABottom - AxisLabelHeight) // 2 + AxisLabelHeight
, BorderBot := MWABottom - Lineweight1 // 2 + 2
, PieSize := 400
, PieX := (A_ScreenWidth - PieSize) // 2
, PieY := (A_ScreenHeight - PieSize) // 2
, BarHeight := A_ScreenHeight - AxisLabelHeight - TaskBarHeight
, AxisTextOffset := BarWidth > 32 ? (BarWidth - 32) // 2 : 0
, Axis_Array := {"X": "X", "Y": "Y"}
, MaxI := 2
 
; Auto-detect the joystick number if called for
if (JoystickNumber < 1) {
Loop, 16 {
GetKeyState, Joy_Name, %A_Index%JoyName
if (Joy_Name) {
JoystickNumber := A_Index
break
}
}
if (!JoystickNumber) {
MsgBox The system does not appear to have any joysticks.
ExitApp
}
}
else {
GetKeyState, Joy_Name, %JoystickNumber%JoyName
if (!Joy_Name) {
MsgBox The system does not appear to have a joystick number %JoystickNumber%.
ExitApp
}
}
 
if (!pToken := Gdip_Startup()) {
MsgBox, 48, Gdiplus error!, Gdiplus failed to start. Please ensure you have Gdiplus on your system.
ExitApp
}
 
If (!Gdip_FontFamilyCreate(Font)) {
MsgBox, 48, Font error!, The font you have specified does not exist on your system.
ExitApp
}
 
; Get joystick information
SetFormat, FloatFast, 03.2
GetKeyState, Joy_Buttons, % JoystickNumber "JoyButtons"
GetKeyState, Joy_Info, % JoystickNumber "JoyInfo"
Loop, Parse, Joy_Info
if (A_LoopField != "C" && A_LoopField != "D" && A_LoopField != "P")
Axis_Array[A_LoopField] := A_LoopField
, %A_LoopField% := true
, MaxI++
else
%A_LoopField% := true
 
; Setup Gdip
Gui, 1: -Caption +E0x80000 +LastFound +AlwaysOnTop +ToolWindow +OwnDialogs
Gui, 1: Show, NA
hwnd1 := WinExist()
, hbm := CreateDIBSection(A_ScreenWidth, A_ScreenHeight)
, hdc := CreateCompatibleDC()
, obm := SelectObject(hdc, hbm)
, G1 := Gdip_GraphicsFromHDC(hdc)
, Gdip_SetSmoothingMode(G1, 4)
, pPen1 := Gdip_CreatePen(Color1, Lineweight1)
, pPen2 := Gdip_CreatePen(Color2, Lineweight2)
, pPen3 := Gdip_CreatePen(Color4, Lineweight3)
, pPen4 := Gdip_CreatePen(Color5, Lineweight4)
, pBrush1 := Gdip_BrushCreateSolid(Color1)
, pBrush2 := Gdip_BrushCreateSolid(Color3)
 
; Crosshair 2
if ((R || U) && Show2ndCrosshair) {
pPen5 := Gdip_CreatePen(Color5, Lineweight3)
, pPen6 := Gdip_CreatePen(Color4, Lineweight4)
, joy_r := joy_u := 50
}
 
; Bar X-offsets
for key, val in Axis_Array
%val%X := A_ScreenWidth - MaxI * BarSpacing + BarSpacing * (A_Index - 1) + 3
 
; Info box
IBH1 := 150
, IBW1 := 450
, IBX1 := A_ScreenWidth - MaxI * BarSpacing - IBW1
, IBY1 := A_ScreenHeight - TaskBarHeight - IBH1 + Lineweight1 // 2
, IBH2 := IBH1 - 8
, IBW2 := IBW1 - 8
, IBX2 := IBX1 + 4
, IBY2 := IBY1 + 4
, FontOptions1 := "x" (IBX1 + 8) " y" (IBY1 + 8) " w" IBW1 - 20 " Left c" SubStr(Color2, 3) " r4 s" FontSize1 " Bold"
 
; Axis box
ABH1 := AxisLabelHeight + 4
, ABW1 := MaxI * BarSpacing
, ABX1 := A_ScreenWidth - MaxI * BarSpacing
, ABY1 := 0
, ABH2 := ABH1 - 16
, ABW2 := ABW1 - 8
, ABX2 := ABX1 + 4
, ABY2 := ABY1 + 4
, FontOptions2 := " y" ABY1 + AxisLabelHeight - 40 " w" ABW1 - 10 " Left c" SubStr(Color2, 3) " r4 s" FontSize2 " Bold"
 
; Update graphics
Loop, {
Buttons_Down := ""
Loop, %Joy_Buttons% {
GetKeyState, joy%A_Index%, %JoystickNumber%joy%A_Index%
if (joy%A_Index% = "D")
Buttons_Down .= " " A_Index
}
 
; Info & axis boxes
InfoText := Joy_Name " (#" JoystickNumber "):`n" Axis_Info "`nButtons Down: " Buttons_Down "`n`n(Ctrl+Esc to exit)"
, Gdip_FillRoundedRectangle(G1, pBrush1, IBX1, IBY1, IBW1, IBH1, 5)
, Gdip_DrawRoundedRectangle(G1, pPen2, IBX2, IBY2, IBW2, IBH2, 5)
, Gdip_TextToGraphics(G1, InfoText, FontOptions1, Font, A_ScreenWidth, A_ScreenHeight)
, Gdip_FillRoundedRectangle(G1, pBrush1, ABX1, ABY1, ABW1, ABH1, 5)
, Gdip_DrawRoundedRectangle(G1, pPen2, ABX2, ABY2, ABW2, ABH2, 5)
 
; Axis bars
Axis_Info := ""
for key, val in Axis_Array {
GetKeyState, joy_%val%, % JoystickNumber "Joy" val
Axis_Info .= val joy_%val% " "
if (joy_%val% > 50)
%val%Y := BarCenter
, %val%h1 := (joy_%val% - 50) * ScaleY1
else
%val%Y := AxisLabelHeight + joy_%val% * ScaleY1 ;
, Sc - (joy_%val% - 50) * ScaleY1
, %val%h1 := BarCenter - %val%Y
Gdip_FillRoundedRectangle(G1, pBrush2, %val%X, %val%Y, BarWidth, %val%h1, 2)
, Gdip_DrawRoundedRectangle(G1, pPen1, %val%X, AxisLabelHeight, BarWidth, BarHeight, 5)
, Gdip_DrawRoundedRectangle(G1, pPen2, %val%X, AxisLabelHeight, BarWidth, BarHeight, 5)
, Gdip_TextToGraphics(G1, val, "x" (%val%X + AxisTextOffset) FontOptions2, Font, A_ScreenWidth, A_ScreenHeight)
}
 
; POV hat
If (P) {
GetKeyState, Joy_P, %JoystickNumber%JoyPOV
Axis_Info .= " POV" Joy_P
if (Joy_P > -1) {
StartAngle := (Joy_P > 33750 || Joy_P <= 2250) ? 247.5 ; up
: Joy_P > 29250 ? 202.5 ; up left
: Joy_P > 24750 ? 157.5 ; left
: Joy_P > 20250 ? 112.5 ; down left
: Joy_P > 15750 ? 67.5 ; down
: Joy_P > 11250 ? 22.5 ; down right
: Joy_P > 6750 ? 337.5 ; right
: 292.5 ; up right
, Gdip_FillPie(G1, pBrush2, PieX, PieY, PieSize, PieSize, StartAngle, 45)
, Gdip_DrawPie(G1, pPen1, PieX, PieY, PieSize, PieSize, StartAngle, 45)
, Gdip_DrawPie(G1, pPen2, PieX, PieY, PieSize, PieSize, StartAngle, 45)
}
}
 
; Crosshair 1
CenterX := ScaleX * joy_x
, CenterY := ScaleY2 * joy_y
, Gdip_DrawLine(G1, pPen3, CenterX-CrosshairOffset, CenterY, CenterX+CrosshairOffset, CenterY)
, Gdip_DrawLine(G1, pPen3, CenterX, CenterY-CrosshairOffset, CenterX, CenterY+CrosshairOffset)
, Gdip_DrawEllipse(G1, pPen4, CenterX-CircleOffset, CenterY-CircleOffset, CircleSize, CircleSize)
, Gdip_DrawEllipse(G1, pPen4, CenterX-3, CenterY-3, 6, 6)
 
; Crosshair 2
if ((R || U) && Show2ndCrosshair)
CenterU := ScaleX * joy_u
, CenterR := ScaleY2 * joy_r
, Gdip_DrawLine(G1, pPen5, CenterU-CrosshairOffset, CenterR, CenterU+CrosshairOffset, CenterR)
, Gdip_DrawLine(G1, pPen5, CenterU, CenterR-CrosshairOffset, CenterU, CenterR+CrosshairOffset)
, Gdip_DrawEllipse(G1, pPen6, CenterU-CircleOffset, CenterR-CircleOffset, CircleSize, CircleSize)
, Gdip_DrawEllipse(G1, pPen6, CenterU-3, CenterR-3, 6, 6)
 
UpdateLayeredWindow(hwnd1, hdc, 0, 0, A_ScreenWidth, A_ScreenHeight)
, Gdip_GraphicsClear(G1)
}
return
 
^Esc::
Exit:
Gdip_Shutdown(pToken)
ExitApp

BBC BASIC[edit]

      VDU 23,22,512;512;8,16,16,0
VDU 5
 
GCOL 4,15
REPEAT
B% = ADVAL(0)
X% = ADVAL(1) / 64
Y% = 1023 - ADVAL(2) / 64
PROCjoy(B%,X%,Y%)
WAIT 4
PROCjoy(B%,X%,Y%)
UNTIL FALSE
END
 
DEF PROCjoy(B%,X%,Y%)
LOCAL I%
LINE X%-32,Y%,X%+32,Y% : LINE X%,Y%-32,X%,Y%+32
VDU 30
FOR I% = 0 TO 15
IF B% AND 1<<I% THEN PRINT "Button "; I%+1 " pressed";
VDU 10,13
NEXT
ENDPROC

GUISS[edit]

Graphical User Interface Support Script only makes use of installed applications. So for this task, we use the joystick calibration routine, which shows a joystick position indicator:

Start,Control Panel, Game Controllers, List:installed controllers,Click:Joystick,
Button:Properties,Button:Test

Liberty BASIC[edit]

    'disable text window
nomainwin
 
'set window size
WindowWidth = 308
WindowHeight = 331
 
'center window on screen
UpperLeftX = int((DisplayWidth-WindowWidth)/2)
UpperLeftY = int((DisplayHeight-WindowHeight)/2)
 
'open graphics window
open "Joystick Position" for graphics_nf_nsb as #m
 
'trap window closing
#m "trapclose [quit]"
 
'put pen down
#m "down"
 
'get center of graphics window
#m "home"
#m "posxy CenterX CenterY"
 
'draw sprite for crosshair
#m "backcolor black; color black"
#m "place 0 20;boxfilled 20 40"
#m "line 0 10 20 10"
#m "line 10 0 10 20"
#m "place 10 10; circle 10"
#m "backcolor white; color red"
#m "line 0 30 20 30"
#m "line 10 20 10 40"
#m "place 10 30; circle 10"
#m "flush"
 
'get sprite image
#m "getbmp plus 0 0 20 40"
#m "cls"
 
'create sprite from image
#m "addsprite crosshair plus"
#m "centersprite crosshair"
#m "spritexy crosshair "; CenterX; " "; CenterY
#m "drawsprites"
 
'check joystick every 100 milliseconds
timer 100, [CheckJoystick]
wait
 
[CheckJoystick]
readjoystick 1
 
'calculate crosshair position
PosX = int(CenterX*Joy1x/32767)
PosY = int(CenterY*Joy1y/32767)
 
'update crosshair position
#m "spritexy crosshair "; PosX; " "; PosY
#m "drawsprites"
 
'display button information
if Joy1button1 > 0 then #m "place 0 0;\\Button 1 pressed"
if Joy1button2 > 0 then #m "place 0 0;\\\Button 2 pressed"
 
wait
 
[quit]
timer 0
close #m
unloadbmp "plus"
end

Locomotive Basic[edit]

10 MODE 1:BORDER 14:x=320:y=200:d=1
20 a=JOY(0) ' read state of first joystick
30 IF d THEN q$="*" ELSE q$=" "
40 IF a THEN MOVE x-8,y+8:TAG:PRINT q$;:TAGOFF
50 IF (a AND 1) AND y<380 THEN y=y+10
60 IF (a AND 2) AND y>20 THEN y=y-10
70 IF (a AND 4) AND x>20 THEN x=x-10
80 IF (a AND 8) AND x<620 THEN x=x+10
90 IF a AND 16 THEN LOCATE 1,1:PRINT "Fire1 pressed":d=1
100 IF a AND 32 THEN LOCATE 1,2:PRINT "Fire2 pressed":d=0
110 IF a<16 THEN LOCATE 1,1:PRINT " ":PRINT " "
120 MOVE x-8,y+8:TAG:PRINT "X";:TAGOFF
130 GOTO 20

Output (this version supports drawing with the cursor):

CPC drawing with joystick.png

Mathematica[edit]

Slider2D[Dynamic[ControllerState[{"X", "Y"}]], ImageSize -> {500, 500}]

OCaml[edit]

Library: SFML

Using the SFML with its OCaml bindings ocaml-sfml:

let remove x = List.filter (fun y -> y <> x)
let buttons_string b =
String.concat " " (List.map string_of_int b)
 
let position app x y =
let view = SFRenderWindow.getView app in
let width, height = SFView.getSize view in
let hw = width /. 2.0 in
let hh = height /. 2.0 in
(hw +. ((x /. 100.0) *. hw),
hh +. ((y /. 100.0) *. hh))
 
let cross =
[| 1.0, 1.0; 10.0, 1.0; 10.0, -1.0; 1.0, -1.0;
1.0, -10.0; -1.0, -10.0; -1.0, -1.0; -10.0, -1.0;
-10.0, 1.0; -1.0, 1.0; -1.0, 10.0; 1.0, 10.0; |]
 
let () =
let app = SFRenderWindow.make (800, 600) "Joystick Position" in
let text = SFText.make "" in
let shape = SFShape.create cross in
SFShape.setFillColor shape SFColor.white;
SFShape.setOutlineColor shape SFColor.white;
SFShape.setOutlineThickness shape 1.0;
let rec display ((x, y), b) =
SFText.setString text (buttons_string b);
let x, y = position app x y in
SFShape.setPosition shape x y;
SFRenderWindow.clear app SFColor.black;
SFRenderWindow.drawText app text ();
SFRenderWindow.drawShape app shape ();
SFRenderWindow.display app;
and loop joyd =
let get_joystick (((x, y), b) as joyd) = function
| SFEvent.JoystickButtonPressed (0, button) -> ((x, y), button::b)
| SFEvent.JoystickButtonReleased (0, button) -> ((x, y), remove button b)
| SFEvent.JoystickMoved (0, SFEvent.JoystickX, av) -> ((av, y), b)
| SFEvent.JoystickMoved (0, SFEvent.JoystickY, av) -> ((x, av), b)
| _ -> joyd
in
let rec proc_event joyd =
match SFRenderWindow.pollEvent app with
| Some SFEvent.KeyPressed (SFKey.Escape,_,_,_,_)
| Some SFEvent.Closed -> ()
| Some event ->
let joyd = get_joystick joyd event in
proc_event joyd
| None ->
display joyd;
loop joyd
in
proc_event joyd
in
loop ((0.0, 0.0), [])

PicoLisp[edit]

This is for the 64-bit version.

Library: GLUT

Note: The code is not yet tested with a real joystick (I don't have one), it was just simulated with dummy functions. Can somebody having a joystick please test it, and remove this message?

(load "@lib/openGl.l")
 
(setq *JoyX 0.0 *JoyY 0.0)
 
(glutInit)
(glutInitDisplayMode (| GLUT_RGBA GLUT_DOUBLE GLUT_ALPHA GLUT_DEPTH))
(glutInitWindowSize 400 400)
(glutCreateWindow "Joystick")
 
(glClearColor 0.3 0.3 0.5 0)
 
(displayPrg
(glClear GL_COLOR_BUFFER_BIT)
(glBegin GL_LINES)
(glVertex2f *JoyX (- *JoyY 0.1)) # Draw crosshair
(glVertex2f *JoyX (+ *JoyY 0.1))
(glVertex2f (- *JoyX 0.1) *JoyY)
(glVertex2f (+ *JoyX 0.1) *JoyY)
(glEnd)
(glFlush)
(glutSwapBuffers) )
 
# Track joystick position
(native `*GlutLib "glutJoystickFunc" NIL
(lisp 'joystickFunc
'((Btn X Y Z)
(msg # Display buttons
(make
(for (B 1 (n0 Btn) (inc B))
(and (bit? 1 Btn) (link B))
(setq Btn (>> 1 Btn)) ) ) )
(setq # Move crosshair
*JoyX (*/ X 1.0 1000)
*JoyY (*/ Y 1.0 1000) )
(glutPostRedisplay) ) )
100 )
 
# Exit upon mouse click
(mouseFunc '((Btn State X Y) (bye)))
(glutMainLoop)

PureBasic[edit]

This is limited to only digital joysticks.

If InitJoystick() = 0
MessageRequester("Error!", "Need to connect a joystick", #PB_MessageRequester_Ok)
End
EndIf
 
;some constants for Window positioning
#WindowW = 100: #WindowH = 100
#CrossW = 10
#p1 = (#WindowW - #CrossW) / 2
#p2 = (#WindowW / 2 - #CrossW)
 
If OpenWindow(0, 0, 0, #WindowW * 2 + 10, #WindowH, "Joystick Position", #PB_Window_SystemMenu)
CreateImage(0, #WindowW, #WindowW)
ImageGadget(0, 0, 0, 0, 0, ImageID(0))
TextGadget(2, #WindowW + 5, 10, #WindowW, 20, "Buttons Pressed:")
CreateImage(1, #WindowW, 40)
ImageGadget(1, #WindowW + 5, 30, 0, 0, ImageID(1))
 
AddKeyboardShortcut(0, #PB_Shortcut_Escape, 0)
Define event, x_movement, y_movement
Repeat
Repeat
event = WindowEvent()
Select event
Case #PB_Event_Menu
If EventMenu() = 0
End
EndIf
Case #PB_Event_CloseWindow
End
EndSelect
Until event = 0
 
Define pressed.s, buttonNum, buttonX, buttonY, buttonText.s, buttonColor
pressed.s = ""
If ExamineJoystick(0)
x_movement = JoystickAxisX(0)
y_movement = JoystickAxisY(0)
 
StartDrawing(ImageOutput(1))
DrawingMode(#PB_2DDrawing_Transparent)
Box(0, 0, #WindowW, 50, RGB($D4, $D0, $C8)) ;a Gray
; check to see if any of the buttons have been pressed
For buttonNum = 1 To 10
buttonX = ((buttonNum - 1) * 20 + 10) % #WindowW
buttonY = ((buttonNum - 1) / 5) * 20 + 10
If JoystickButton(0, buttonNum)
buttonColor = RGB($FF, 0, 0) ;Red
Else
buttonColor = RGB($80, $80, $80) ;Gray
EndIf
Circle(buttonX, buttonY, 9, buttonColor)
buttonText = Str(buttonNum)
DrawText(buttonX - TextWidth(buttonText) / 2, buttonY - TextHeight(buttonText) / 2, buttonText, RGB($FF, $FF, $FF)) ;White
Next
StopDrawing()
 
SetGadgetState(1, ImageID(1))
EndIf
 
 
StartDrawing(ImageOutput(0))
Box(0,0, #WindowW, #WindowW, RGB($FF, $FF, $FF)) ;White
Line(#p1 + x_movement * #p2, #WindowW / 2 + y_movement * #p2, #CrossW, 1, RGB($FF, 0, 0)) ;Red
Line(#WindowW / 2 + x_movement * #p2, #p1 + y_movement * #p2, 1, #CrossW, RGB($FF, 0, 0)) ;Red
StopDrawing()
 
SetGadgetState(0, ImageID(0))
 
Delay(10)
Until event = #PB_Event_CloseWindow
EndIf

JoystickPosition-PureBasic.png

Python[edit]

Library: Pygame
import sys
import pygame
 
pygame.init()
 
# Create a clock (for framerating)
clk = pygame.time.Clock()
 
# Grab joystick 0
if pygame.joystick.get_count() == 0:
raise IOError("No joystick detected")
joy = pygame.joystick.Joystick(0)
joy.init()
 
# Create display
size = width, height = 600, 600
screen = pygame.display.set_mode(size)
pygame.display.set_caption("Joystick Tester")
 
# Frame XHair zone
frameRect = pygame.Rect((45, 45), (510, 510))
 
# Generate crosshair
crosshair = pygame.surface.Surface((10, 10))
crosshair.fill(pygame.Color("magenta"))
pygame.draw.circle(crosshair, pygame.Color("blue"), (5,5), 5, 0)
crosshair.set_colorkey(pygame.Color("magenta"), pygame.RLEACCEL)
crosshair = crosshair.convert()
 
# Generate button surfaces
writer = pygame.font.Font(pygame.font.get_default_font(), 15)
buttons = {}
for b in range(joy.get_numbuttons()):
buttons[b] = [
writer.render(
hex(b)[2:].upper(),
1,
pygame.Color("red"),
pygame.Color("black")
).convert(),
# Get co-ords: ((width*slot)+offset, offset). Offsets chosen
# to match frames.
((15*b)+45, 560)
]
 
while True:
# Pump and check the events queue
pygame.event.pump()
for events in pygame.event.get():
if events.type == pygame.QUIT:
pygame.quit()
sys.exit()
 
# Black the screen
screen.fill(pygame.Color("black"))
 
# Get joystick axes
x = joy.get_axis(0)
y = joy.get_axis(1)
 
# Blit to the needed coords:
# x*amplitude+(centre offset (window size/2))-(xhair offset (xh size/2))
screen.blit(crosshair, ((x*250)+300-5, (y*250)+300-5))
pygame.draw.rect(screen, pygame.Color("red"), frameRect, 1)
 
# Get and display the joystick buttons
for b in range(joy.get_numbuttons()):
if joy.get_button(b):
screen.blit(buttons[b][0], buttons[b][1])
 
# Write the display
pygame.display.flip()
clk.tick(40) # Limit to <=40 FPS

Tcl[edit]

Library: Tk
Library: mkLibsdl
package require Tk 8.6
package require mkLibsdl
 
# This code assumes we're dealing with the first pair of axes on the first
# joystick; modern joysticks are complex...
 
# Callback for all joystick activity
proc display {joyDict} {
global x y buttons message
set axis -1
dict with joyDict {
if {$joystick != 0} return
if {[info exist button]} {
# Handle button presses...
set buttons($button) $value
set message "Buttons:"
foreach b [lsort -integer [array names buttons]] {
if {$buttons($b)} {
lappend message $b
}
}
} else {
# Handle joystick movement...
if {$axis == -1} return
set value [expr {$value / 32768.0 * 100 + 120}]
if {$axis == 0} {
set x $value
} elseif {$axis == 1} {
set y $value
}
.c coords xhairV $x [expr {$y-5}] $x [expr {$y+5}]
.c coords xhairH [expr {$x-5}] $y [expr {$x+5}] $y
}
}
}
 
# Make a GUI
set message "Buttons:"
pack [canvas .c -width 240 -height 240] [label .l -textvariable message]
set x [set y 120]
.c create line {120 115 120 125} -tags xhairV
.c create line {115 120 125 120} -tags xhairH
joystick event eval {display [joystick event peek]}