旋钮 – 电位器Gui

主要功能是创建一个旋钮控件（Rotary Knob），并在 GUI 中显示和交互。用户可以通过鼠标拖动模拟旋钮转动，从而动态调整旋钮的值（范围为 0 到 360）。

旋钮 - 电位器Gui.ahk

; 原版有4旋钮的示例
; https://www.autohotkey.com/boards/viewtopic.php?f=6&t=77311
Gui, Color, Black 
SetBatchLines -1
hGui := WinExist()
Gui, +Lastfound 

size=75  ; 在35到150之间效果最佳
PotNow = 0

Gui, add, Text, x2 y5 h%size% w%size% hwndhText1 gt1, 
Gui, Add, Progress, x5 y+5 w%size% cBlue Range0-360 vp1, %PotNow%

Gui, Show,  , 1 Pot

RotaryKnob(hText1,size,PotNow,1)
Return

t1:
MouseGetPos, , OutY
StartPoint := OutY
Loop {
  KeyIsDown := GetKeyState("LButton")
  If (KeyIsDown = 1) {
    MouseGetPos, , OutY
    PotSet := StartPoint-OutY+PotNow
    
    If PotSet < 0
      PotSet = 0
    If PotSet > 360
      PotSet = 360
    RotaryKnob(hText1,size,PotSet,1)
    GuiControl, , p1, %PotSet%
    Sleep, 50
  }

  If (KeyIsDown = 0) {
    PotNow := PotSet
    Break
  }
}
Return

; Oringal concept by ahklerner
; https://autohotkey.com/board/topic/64700-rotary-knob-for-a-gui/#entry408451
; Edited to be used as a library function by x32
; https://www.autohotkey.com/boards/viewtopic.php?f=6&t=77311

RotaryKnob(hWnd,Size,angle,tn) {
  Global
  x = 1
  y = 1
  canvas_size := Size
  knob_size := canvas_size * 1.05
  indicator_size := canvas_size /9
  GetXY(pos_x := x+(knob_size/2)-4,pos_y := y+(knob_size/2)-4, knob_size / 3, angle)
  hDc := DllCall("GetDC", "uint", hText%tn%)
  DllCall("Ellipse", "uint", hDc, "int", x, "int", y, "int", knob_size, "int", knob_size)
  DllCall("Ellipse", "uint", hDc, "int", x+2, "int", y+2, "int", knob_size-2, "int", knob_size-2)
  DllCall("Ellipse", "uint", hDc, "int", pos_x, "int", pos_y, "int", pos_x + indicator_size, "int", pos_y + indicator_size)
}

GetXY(Byref x0, byref y0, r, angle) {
  x0 := x0-sin(angle*4*ATan(1)/180)*r
  y0 := y0+cos(angle*4*ATan(1)/180)*r
}