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# SPDX-License-Identifier: GPL-2.0-or-later
# -----------------------------------------------------------------------
# Author: Alan Odom (Clockmender), Rune Morling (ermo) Copyright (c) 2019
# -----------------------------------------------------------------------
#
import bpy
import bmesh
from math import sin, cos, tan, pi
from mathutils import Vector
from .pdt_functions import (
set_mode,
view_coords,
)
class PDT_OT_WaveGenerator(bpy.types.Operator):
"""Generate Trig Waves in Active Object"""
bl_idname = "pdt.wave_generator"
bl_label = "Generate Waves"
bl_options = {"REGISTER", "UNDO"}
@classmethod
def poll(cls, context):
pg = context.scene.pdt_pg
return pg.trig_obj is not None
def execute(self, context):
"""Generate Trig Waves in Active Object.
Note:
Uses all the PDT trig_* variables.
This function will draw a trigonometrical wave based upon cycle length
One cycle is assumed to be 180 degrees, so half a revolution of an imaginary
rotating object. If a full cycle from 0 to 360 degrees is required, the cycles
number should be set to 2.
Args:
context: Blender bpy.context instance.
Returns:
Nothing.
"""
pg = context.scene.pdt_pg
plane = pg.plane
# Find the horizontal, vertical and depth axes in the view from working plane.
# Order is: H, V, D.
#
a1, a2, a3 = set_mode(plane)
# Make sure object selected in the UI is the active object.
#
for obj in bpy.data.objects:
obj.select_set(state=False)
context.view_layer.objects.active = pg.trig_obj
# x_inc is the increase in X (Horiz axis) per unit of resolution of the wave, so if
# resolution is 9, nine points will be drawn in each cycle representing increases of
# 20 degrees and 1/9th of the cycle length.
#
x_inc = pg.trig_len / pg.trig_res
if pg.trig_del:
# Delete all existing vertices first.
#
bpy.ops.object.mode_set(mode='EDIT')
for v in pg.trig_obj.data.vertices:
v.select = True
bpy.ops.mesh.delete(type='VERT')
bpy.ops.object.mode_set(mode='OBJECT')
if pg.trig_obj.mode != "EDIT":
bpy.ops.object.mode_set(mode='EDIT')
bm = bmesh.from_edit_mesh(pg.trig_obj.data)
# Loop for each point in the number of cycles times the resolution value.
# Uses basic trigonomtry to calculate the wave locations.
# If Absolute has been set, all values are made positive.
# z_val is assumed to be the offset from the horizontal axis of the wave.
# These values will be offset by the Offset Vector given in the UI.
#
for i in range((pg.trig_res * pg.trig_cycles) + 1):
# Uses a calculation of trig function angle of imaginary object times maximum amplitude
# of wave. So with reolution at 9, angular increments are 20 degrees.
# Angles must be in Radians for this calcultion.
#
if pg.trig_type == "sin":
if pg.trig_abs:
z_val = abs(sin((i / pg.trig_res) * pi) * pg.trig_amp)
else:
z_val = sin((i / pg.trig_res) * pi) * pg.trig_amp
elif pg.trig_type == "cos":
if pg.trig_abs:
z_val = abs(cos((i / pg.trig_res) * pi) * pg.trig_amp)
else:
z_val = cos((i / pg.trig_res) * pi) * pg.trig_amp
else:
if pg.trig_abs:
z_val = abs(tan((i / pg.trig_res) * pi) * pg.trig_amp)
else:
z_val = tan((i / pg.trig_res) * pi) * pg.trig_amp
if abs(z_val) > pg.trig_tanmax:
if z_val >= 0:
z_val = pg.trig_tanmax
else:
if pg.trig_abs:
z_val = pg.trig_tanmax
else:
z_val = -pg.trig_tanmax
# Start with Offset Vector from UI and add wave offsets to it.
# Axis a3 (depth) is never changed from offset vector in UI.
#
vert_loc = Vector(pg.trig_off)
vert_loc[a1] = vert_loc[a1] + (i * x_inc)
vert_loc[a2] = vert_loc[a2] + z_val
if plane == "LO":
# Translate view local coordinates (horiz, vert, depth) into World XYZ
#
vert_loc = view_coords(vert_loc[a1], vert_loc[a2], vert_loc[a3])
vertex_new = bm.verts.new(vert_loc)
# Refresh Vertices list in object data.
#
bm.verts.ensure_lookup_table()
if i > 0:
# Make an edge from last two vertices in object data.
#
bm.edges.new([bm.verts[-2], vertex_new])
bmesh.update_edit_mesh(pg.trig_obj.data)
bpy.ops.object.mode_set(mode='OBJECT')
return {"FINISHED"}
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