1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
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()
|
