A very simple AHK script that makes zooming with a tablet in aseprite much better

aseprite-zoom-hotkey.ahk

; Very simple AHK script that makes zooming with a tablet in aseprite much better

; -= How to use this =-
; Ensure you have the "Edit -> Keyboard Shortcuts -> Mouse Wheel -> Zoom with scroll wheel" option enabled else this will NOT work
;
; Hold the 'Z' key and move your mouse/pen in either the X or Y axis (depending what you've set in the config below)
; to adjust the Zoom!
;
; Would recommend to disable the Zoom Tool hotkey inside of Aseprite if you have that set to 'Z'

; -= Credit =-
; Inspired by the https://github.com/arcticnoah/aseprite-brush-size-hotkey ahk script
; Please check it out due to this AHK script taking heavy inspiration from there

; -= Config =-
; when true, it'll check the x axis of the mouse, if false, it'll instead use the y axis
check_x_axis := false
; Invert direction to move cursor in order to zoom in/zoom out
inverted := false

; the time interval for when the mouse position is checked (in milliseconds).
; lower means more sensitive/speedy and higher means less sensitive/speedy
tick_rate = 25

; -= Main Script =-
enable_hotkey := true
holding := false
previous_tick_mouse_pos_x = 0
previous_tick_mouse_pos_y = 0

UpdateZoom() 
{
    global check_x_axis
    global previous_tick_mouse_pos_x
    global previous_tick_mouse_pos_y
    global inverted
    ; Check if you're still holding the keybind to make it more responsive
    if (!holding) 
        Return
    ;

    MouseGetPos, current_tick_mouse_pos_x, current_tick_mouse_pos_y

    ; If is inverted
    inverted_value := 0
    If inverted {
        inverted_value := -1
    }   
    Else {
        inverted_value := 1
    }
    
    ; Mouse position difference since last tick
    If check_x_axis {
        ; Checking X axis
        mouse_pos_difference :=  inverted_value * (current_tick_mouse_pos_x - previous_tick_mouse_pos_x)
    }
    Else {
        ; Checking Y axis
        mouse_pos_difference := inverted_value * (current_tick_mouse_pos_y - previous_tick_mouse_pos_y)
    }

    If (mouse_pos_difference != 0 && mouse_pos_difference > 0) {
        ; Mouse position has increased, decrease zoom (The reverse if the 'inverted' configuration is enabled)
        Send {CTRL}{WheelDown}
    }
    Else If (mouse_pos_difference != 0 && mouse_pos_difference < 0) {
        ; Mouse position has decreased, increase zoom (The reverse if the 'inverted' configuration is enabled)
        Send {CTRL}{WheelUp}
    }
}

; CTRL + ALT + Z shortcut to toggle pause the script's functionality
#IfWinActive ahk_exe Aseprite.exe
^!z up::
    global enable_hotkey
    global holding
    holding := false
    enable_hotkey := !enable_hotkey
Return

; You can change this key to whatever you want, just make sure to change it on line 75 and 106 as well
#IfWinActive ahk_exe Aseprite.exe
$z::
    global enable_hotkey

    If (enable_hotkey) {
        MouseGetPos, previous_tick_mouse_pos_x, previous_tick_mouse_pos_y

        ; Send the key input as per usual, ensures typing isn't delayed
        SendInput {Text}z
        holding := true

        ; Start check loop
        loop {
            Sleep, %tick_rate%
            checkMousePos()
            if (!holding) 
                Return
        }
    }
    
Return

; Disable zooming.
$z up::
    global holding
    holding := false
Return

; Check mouse and update zoom.
checkMousePos() {
    global previous_tick_mouse_pos_x
    global previous_tick_mouse_pos_y

    UpdateZoom()

    MouseGetPos, local_x, local_y
    previous_tick_mouse_pos_x := local_x
    previous_tick_mouse_pos_y := local_y
}