Rotate Canvas in Grease Pencil

Here I posted a small add-on that does the job: 2D Viewport Roll

Hello guys, as long as I ve resarched this hasnt been solved. This is my proposal, I work on design and advertising and know how important is this feature for those who work drawing. My proposal focus on precision of the feature and "universality" so it can work precise with, tablet or mouse. I hope I m not asking too much. Thank you everyone.

I use these scripts to orbit, roll and change fov modal

I assigned

Alt+Shift+Middle drag to roll

Alt+Ctrl+Middle drag to orbit horizontal

Ctrl+Shift+Middle drag to orbit vertical

Alt+Ctrl+Shift+Middle drag to change fov

Pretty handy specially with pen which has no scroll. I'm going to change the rotational tweak behavior to linear vertical/horizontal and use tweak direction to switch orbit. i will post the updated version.

these are bare operator scripts i can package them as addon if needed..

{attachment ViewOrbitModalpy}

import bpy,mathutils
Operator = bpy.types.Operator
Vector = mathutils.Vector

class ViewOrbitModal(Operator):
    """Orbit or Roll Viewport Modal"""
    bl_idname = "view3d.view_orbit_modal"
    bl_label = "View Orbit Modal"


    type = bpy.props.EnumProperty(
        items = [
        ('HORIZONTAL','Horizontal',''),
        ('VERTICAL','Vertical',''),
        ('ROLL','Roll',''),
        ('VIEW','View','')
        ],
        name = "Type",
    )

    def get_vec(self, context, event):
        x = event.mouse_region_x-context.region.width/2
        y = event.mouse_region_y-context.region.height/2
        return Vector((x,y))

    def modal(self, context, event):
        if event.type == 'MOUSEMOVE': 
            vec = self.get_vec(context, event)
            delta = self.vec.angle_signed(vec)

            if self.type == 'HORIZONTAL':
                bpy.ops.view3d.view_orbit(angle=delta, type='ORBITRIGHT')
            elif self.type == 'VERTICAL':
                bpy.ops.view3d.view_orbit(angle=delta, type='ORBITUP')
            elif self.type == 'ROLL':
                bpy.ops.view3d.view_roll(angle=delta)

            self.vec = vec

        elif event.type in ('LEFTMOUSE','MIDDLEMOUSE','RIGHTMOUSE','ESC'):
            return {'FINISHED'}

        return {'RUNNING_MODAL'}

    def invoke(self, context, event):
        self.vec = self.get_vec(context, event)
        context.window_manager.modal_handler_add(self)
        return {'RUNNING_MODAL'}

class ViewFovModal(Operator):
    """Set lens/FOV value of viewport or camera modal"""
    bl_idname = "view3d.view_fov_modal"
    bl_label = "View FOV Modal"

    def get_cam(self,context):
        space = context.area.spaces[0]
        if space.region_3d.view_perspective == 'CAMERA':
            return space.camera.data
        else:
            return context.space_data


    def modal(self, context, event):
        if event.type == 'MOUSEMOVE':  
            delta = event.mouse_region_y - self.init
            delta/=2
            cam = self.get_cam(context)
            cam.lens = self.value + delta
            context.area.header_text_set(str(cam.lens))
            # print(cam.lens)



        elif event.type in ('LEFTMOUSE','MIDDLEMOUSE','RIGHTMOUSE','ESC'):
            context.area.header_text_set()
            return {'FINISHED'}

        return {'RUNNING_MODAL'}

    def invoke(self, context, event):
        self.init = event.mouse_region_y
        self.value = self.get_cam(context).lens
        context.window_manager.modal_handler_add(self)
        return {'RUNNING_MODAL'}    

 bpy.utils.register_module(__name__)

<kbd>Shift</kbd>+<kbd>numpad 4</kbd> and <kbd>Shift</kbd>+<kbd>numpad 6</kbd> respectively rotate the view right or left in a 2D manner (it rotates the view camera in its local axis). I know it's not as smooth as a good mouse drag but in case you didn't know about it, you have that in the mean time.

⚠ Note: you have to either be out of the scene's active camera or lock the camera to the view for it to work.

Guys, check this : twitter.com/pablodp606/status/1146063560499318784

It's a good solution locking the view to the camera but i don't want to give the posibility to animate the camera doing that and if the camera is alredy animated.

This means the ability to rotate (roll) the view when in camera perspective (without the camera itself rotating). Right?

This is a pretty much what i wanted. github.com/juanquico/addon_rotate_canvas

Here is two ways.

1. rotate view/camera
2. rotate GP-object.

Anyway, you can clear rotation. But I upvote for easier and smoother roll than Shift+numkeys.

pretty easy modal operator to write. if there are enough people interested I might write one.

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