PLUGIN: Multiple - Wall of code for OP8 and OP12

[Danweel]

Very difficult to observe (it's 50 lines I think?) though it walks through the logic steps, consider:

def op8(context: bpy.types.Context) -> None:
    """Apply random noise to strokes to simulate hand-drawn jitter."""
    
    # 1. Prepare the canvas
    bpy.ops.object.mode_set(mode='EDIT_GPENCIL')
    
    # 2. Apply the "Jitter" effect (The core logic)
    _apply_jitter_pattern(context, iterations=2)
    
    # 3. Apply thickness variation
    _apply_thickness_variation(context)
    
    # 4. Cleanup
    bpy.ops.gpencil.select_all(action='DESELECT')
    bpy.ops.object.mode_set(mode='PAINT_GPENCIL')
    bpy.ops.ed.undo_push(message="Randomize Line Art")

this is what this is trying to do:

def op8(context):
    _do_jitter_step_1(context)
    _do_jitter_step_2(context)
    _do_thickness(context)

def _do_jitter_step_1(context):
    # ... logic for step 1 ...

def _do_jitter_step_2(context):
    # ... logic for step 2 ...

Which makes it easier for maintainers and forkers to work with.

• If the "Thickness" part is broken, you can look at _apply_thickness_variation in isolation. You don't have to scroll through 100 lines of selection logic to find the bug.
• If you ever want to test just the thickness logic, you can call that helper function directly.
• If you want to change the "Jitter" to only happen 3 times instead of 4, you just change the loop inside the helper function, rather than hunting through the main function

That's the idea anyway.

?? needs testing:

# --- CONSTANTS ---
MYBRUSHSIZE: int = 13

# --- HELPER FUNCTIONS (The "Ingredients") ---
# These are private helpers, not meant to be called by users directly.
# They are prefixed with _ to indicate they are internal.

def _toggle_select_mode(context: bpy.types.Context, mode: int) -> None:
    """Helper to toggle selection mode safely."""
    bpy.ops.gpencil.selectmode_toggle(mode=mode)

def _apply_noise_step(context: bpy.types.Context, x: float, y: float, size: float) -> None:
    """Applies one direction of noise to the selection."""
    bpy.ops.gpencil.select_all(action='SELECT')
    bpy.ops.gpencil.selectmode_toggle(mode=0)
    bpy.ops.gpencil.select_random(ratio=0.995, seed=random.randint(0, 255), action='DESELECT', unselect_ends=False)
    bpy.ops.transform.translate(
        value=(x, y, 0), 
        orient_type='VIEW', 
        use_proportional_edit=True, 
        proportional_edit_falloff='SMOOTH', 
        proportional_size=size, 
        gpencil_strokes=True
    )

def _apply_thickness_variation(context: bpy.types.Context, factor: float) -> None:
    """Applies thickness variation to the selection."""
    bpy.ops.transform.transform(
        mode='GPENCIL_SHRINKFATTEN', 
        value=(factor, 1, 1, 1), 
        use_proportional_edit=True, 
        proportional_edit_falloff='SMOOTH', 
        proportional_size=10, 
        use_proportional_connected=True, 
        gpencil_strokes=True
    )

# --- OPERATORS ---

class SimpleOperatorOP8(bpy.types.Operator):
    bl_idname = "fred.op8"
    bl_label = "Randomize Line Art"

    def execute(self, context: bpy.types.Context) -> {'FINISHED'}:
        # The operator becomes a clear list of steps
        bpy.ops.object.mode_set(mode='EDIT_GPENCIL')
        
        # Run the noise pattern 4 times with different directions
        _apply_noise_step(context, 0.0005, 0.0005, 0.01)
        _apply_noise_step(context, -0.0005, -0.0005, 0.01)
        _apply_noise_step(context, -0.0005, 0.0005, 0.01)
        _apply_noise_step(context, 0.0005, -0.0005, 0.01)
        
        # Apply thickness
        _apply_thickness_variation(context, 1.0)
        
        # Cleanup
        bpy.ops.gpencil.select_all(action='DESELECT')
        bpy.ops.object.mode_set(mode='PAINT_GPENCIL')
        
        self.report({'INFO'}, "Randomized Line Art")
        return {'FINISHED'}