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from .prefs import get_addon_prefs
import bpy
import math
import mathutils
from bpy_extras.view3d_utils import location_3d_to_region_2d
from bpy.props import BoolProperty, EnumProperty
## draw utils
import gpu
import bgl
import blf
from gpu_extras.batch import batch_for_shader
from gpu_extras.presets import draw_circle_2d
def draw_callback_px(self, context):
# 50% alpha, 2 pixel width line
shader = gpu.shader.from_builtin('2D_UNIFORM_COLOR')
bgl.glEnable(bgl.GL_BLEND)
bgl.glLineWidth(2)
# init
batch = batch_for_shader(shader, 'LINE_STRIP', {"pos": [self.center, self.initial_pos]})#self.vector_initial
shader.bind()
shader.uniform_float("color", (0.5, 0.5, 0.8, 0.6))
batch.draw(shader)
batch = batch_for_shader(shader, 'LINE_STRIP', {"pos": [self.center, self.pos_current]})
shader.bind()
shader.uniform_float("color", (0.3, 0.7, 0.2, 0.5))
batch.draw(shader)
# restore opengl defaults
bgl.glLineWidth(1)
bgl.glDisable(bgl.GL_BLEND)
## text
font_id = 0
## draw text debug infos
blf.position(font_id, 15, 30, 0)
blf.size(font_id, 20, 72)
blf.draw(font_id, f'angle: {math.degrees(self.angle):.1f}')
class RC_OT_RotateCanvas(bpy.types.Operator):
bl_idname = 'view3d.rotate_canvas'
bl_label = 'Rotate Canvas'
bl_options = {"REGISTER", "UNDO"}
def get_center_view(self, context, cam):
'''
https://blender.stackexchange.com/questions/6377/coordinates-of-corners-of-camera-view-border
Thanks to ideasman42
'''
frame = cam.data.view_frame()
mat = cam.matrix_world
frame = [mat @ v for v in frame]
frame_px = [location_3d_to_region_2d(context.region, context.space_data.region_3d, v) for v in frame]
center_x = frame_px[2].x + (frame_px[0].x - frame_px[2].x)/2
center_y = frame_px[1].y + (frame_px[0].y - frame_px[1].y)/2
return mathutils.Vector((center_x, center_y))
def execute(self, context):
if self.hud:
bpy.types.SpaceView3D.draw_handler_remove(self._handle, 'WINDOW')
context.area.tag_redraw()
if self.in_cam:
self.cam.rotation_mode = self.org_rotation_mode
return {'FINISHED'}
def modal(self, context, event):
if event.type in {'MOUSEMOVE','INBETWEEN_MOUSEMOVE'}:
# Get current mouse coordination (region)
self.pos_current = mathutils.Vector((event.mouse_region_x, event.mouse_region_y))
# Get current vector
self.vector_current = (self.pos_current - self.center).normalized()
# Calculates the angle between initial and current vectors
self.angle = self.vector_initial.angle_signed(self.vector_current)#radian
# print (math.degrees(self.angle), self.vector_initial, self.vector_current)
if self.in_cam:
self.cam.matrix_world = self.cam_matrix
self.cam.rotation_euler.rotate_axis("Z", self.angle)
else:#free view
context.space_data.region_3d.view_rotation = self._rotation
rot = context.space_data.region_3d.view_rotation
rot = rot.to_euler()
rot.rotate_axis("Z", self.angle)
context.space_data.region_3d.view_rotation = rot.to_quaternion()
if event.type in {'RIGHTMOUSE', 'LEFTMOUSE', 'MIDDLEMOUSE'} and event.value == 'RELEASE':
if not self.angle:
# self.report({'INFO'}, 'Reset')
aim = context.space_data.region_3d.view_rotation @ mathutils.Vector((0.0, 0.0, 1.0))#view vector
context.space_data.region_3d.view_rotation = aim.to_track_quat('Z','Y')#track Z, up Y
self.execute(context)
return {'FINISHED'}
if event.type == 'ESC':#Cancel
self.execute(context)
if self.in_cam:
self.cam.matrix_world = self.cam_matrix
else:
context.space_data.region_3d.view_rotation = self._rotation
return {'CANCELLED'}
return {'RUNNING_MODAL'}
def invoke(self, context, event):
self.hud = get_addon_prefs().canvas_use_hud
self.angle = 0.0
self.in_cam = context.region_data.view_perspective == 'CAMERA'
if self.in_cam:
# Get camera from scene
self.cam = bpy.context.scene.camera
#return if one element is locked (else bypass location)
if self.cam.lock_rotation[:] != (False, False, False):
self.report({'WARNING'}, 'Camera rotation is locked')
return {'CANCELLED'}
self.center = self.get_center_view(context, self.cam)
# store original rotation mode
self.org_rotation_mode = self.cam.rotation_mode
# set to euler to works with quaternions, restored at finish
self.cam.rotation_mode = 'XYZ'
# store camera matrix world
self.cam_matrix = self.cam.matrix_world.copy()
# self.cam_init_euler = self.cam.rotation_euler.copy()
else:
self.center = mathutils.Vector((context.area.width/2, context.area.height/2))
# store current rotation
self._rotation = context.space_data.region_3d.view_rotation.copy()
# Get current mouse coordination
self.pos_current = mathutils.Vector((event.mouse_region_x, event.mouse_region_y))
self.initial_pos = self.pos_current# for draw debug, else no need
# Calculate inital vector
self.vector_initial = self.pos_current - self.center
self.vector_initial.normalize()
# Initializes the current vector with the same initial vector.
self.vector_current = self.vector_initial.copy()
args = (self, context)
if self.hud:
self._handle = bpy.types.SpaceView3D.draw_handler_add(draw_callback_px, args, 'WINDOW', 'POST_PIXEL')
context.window_manager.modal_handler_add(self)
return {'RUNNING_MODAL'}
### --- REGISTER
def register():
bpy.utils.register_class(RC_OT_RotateCanvas)
def unregister():
bpy.utils.unregister_class(RC_OT_RotateCanvas)
# if __name__ == "__main__":
# register()