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monkstonemonkstone
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Axis stuff
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4 files changed

+276
-3
lines changed

‎contributed/library/branch3D/rotator.rb‎

Lines changed: 6 additions & 3 deletions
Original file line numberDiff line numberDiff line change
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# Rotator module is required because rotate is not implemented for
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# JRubyArt 3D. Here we use Vec2D.rotate! to do Euclid rotation about an
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# axis (we can then apply the rotation to each axis in turn)
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# axis (we can then apply the rotation to each axis in turn) we mimic Toxiclibs
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# Vec3D implementation
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# NB: we use quaternions in ArcBall (to avoid gimbal lock)
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# See:
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# https://medium.com/@behreajj/3d-rotations-in-processing-vectors-matrices-quaternions-10e2fed5f0a3
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module Rotate
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def self.axis!(axis, vec, theta)
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array = vec.to_a
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array.slice! axis
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other = Vec2D.new(*array).rotate! theta
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case axis
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when 0 # xaxis
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vec.y = other.x
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vec.z = other.y
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vec.y = other.y
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vec.z = other.x
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when 1 # yaxis
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vec.x = other.x
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vec.z = other.y

‎processing_app/library/vecmath/arcball/cylinder_axis.rb‎

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# frozen_string_literal: true
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INSTRUCTIONS = <<~TEXT
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#######################################################
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1. Mouse Drag to rotate axes
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2. Hold down x, y or z key to clamp rotation in one axis
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3. Mouse wheel to zoom
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Red = xaxis
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Green = yaxis
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Blue = zaxis
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#######################################################
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TEXT
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SIDES = 30
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ANGLE = 360 / SIDES
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LENGTH = 200
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RADIUS = 20
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def setup
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sketch_title 'Rotate Axes'
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ArcBall.init self
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puts INSTRUCTIONS
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end
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def draw
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background(128, 128, 128)
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lights
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no_stroke
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draw_axes
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end
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def draw_axes
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fill(255, 0, 0)
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draw_x_axis
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fill(0, 255, 0)
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draw_y_axis
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fill(0, 0, 255)
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draw_z_axis
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end
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def draw_y_axis
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# draw top of the tube
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begin_shape
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(0..SIDES).each do |i|
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y = DegLut.cos(i * ANGLE) * RADIUS
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x = DegLut.sin(i * ANGLE) * RADIUS
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vertex(x, 0, y)
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end
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end_shape(CLOSE)
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# draw bottom of the tube
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begin_shape
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(0..SIDES).each do |i|
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y = DegLut.cos(i * ANGLE) * RADIUS
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x = DegLut.sin(i * ANGLE) * RADIUS
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vertex(x, LENGTH, y)
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end
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end_shape(CLOSE)
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# draw SIDES
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begin_shape(TRIANGLE_STRIP)
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(0..SIDES).each do |i|
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y = DegLut.cos(i * ANGLE) * RADIUS
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x = DegLut.sin(i * ANGLE) * RADIUS
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vertex(x, 0, y)
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vertex(x, LENGTH, y)
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end
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end_shape(CLOSE)
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end
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def draw_z_axis
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# draw top of the tube
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begin_shape
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(0..SIDES).each do |i|
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x = DegLut.cos(i * ANGLE) * RADIUS
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y = DegLut.sin(i * ANGLE) * RADIUS
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vertex(0, x, y)
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end
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end_shape(CLOSE)
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# draw bottom of the tube
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begin_shape
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(0..SIDES).each do |i|
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x = DegLut.cos(i * ANGLE) * RADIUS
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y = DegLut.sin(i * ANGLE) * RADIUS
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vertex(LENGTH, x, y)
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end
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end_shape(CLOSE)
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# draw SIDES
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begin_shape(TRIANGLE_STRIP)
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(0..SIDES).each do |i|
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x = DegLut.cos(i * ANGLE) * RADIUS
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y = DegLut.sin(i * ANGLE) * RADIUS
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vertex(0, x, y)
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vertex(LENGTH, x, y)
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end
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end_shape(CLOSE)
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end
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def draw_x_axis
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# draw top of the tube
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begin_shape
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(0..SIDES).each do |i|
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x = DegLut.cos(i * ANGLE) * RADIUS
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y = DegLut.sin(i * ANGLE) * RADIUS
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vertex(x, y, 0)
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end
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end_shape(CLOSE)
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# draw bottom of the tube
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begin_shape
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(0..SIDES).each do |i|
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x = DegLut.cos(i * ANGLE) * RADIUS
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y = DegLut.sin(i * ANGLE) * RADIUS
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vertex(x, y, LENGTH)
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end
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end_shape(CLOSE)
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# draw SIDES
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begin_shape(TRIANGLE_STRIP)
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(0..SIDES).each do |i|
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x = DegLut.cos(i * ANGLE) * RADIUS
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y = DegLut.sin(i * ANGLE) * RADIUS
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vertex(x, y, 0)
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vertex(x, y, LENGTH)
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end
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end_shape(CLOSE)
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end
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def settings
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size(500, 500, P3D)
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end

‎processing_app/library/vecmath/arcball/cylinder_axis_vec3D.rb‎

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# frozen_string_literal: true
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INSTRUCTIONS = <<~TEXT
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#######################################################
5+
1. Mouse Drag to rotate axes
6+
2. Hold down x, y or z key to clamp rotation in one axis
7+
3. Mouse wheel to zoom
8+
Red = xaxis
9+
Green = yaxis
10+
Blue = zaxis
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#######################################################
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TEXT
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load_library :axes
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attr_reader :axes
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def setup
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sketch_title 'Rotate Axes'
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ArcBall.init self
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@axes = Axes.new self
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puts INSTRUCTIONS
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end
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def draw
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background(128, 128, 128)
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lights
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no_stroke
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axes.draw
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end
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def settings
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size(500, 500, P3D)
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end

‎processing_app/library/vecmath/arcball/library/axes/axes.rb‎

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# frozen_string_literal: true
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java_import 'processing.core.PConstants'
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# Three axes as a class
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class Axes
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SIDES = 30
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ANGLE = 360 / SIDES
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LENGTH = 200
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RADIUS = 20
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attr_reader :app
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def initialize(app)
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@app = app
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end
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def draw
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app.fill(255, 0, 0)
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draw_x_axis
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app.fill(0, 255, 0)
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draw_y_axis
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app.fill(0, 0, 255)
23+
draw_z_axis
24+
end
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26+
def draw_y_axis
27+
# draw top of the tube
28+
app.begin_shape
29+
(0..SIDES).each do |i|
30+
y = DegLut.cos(i * ANGLE) * RADIUS
31+
x = DegLut.sin(i * ANGLE) * RADIUS
32+
app.vertex(x, 0, y)
33+
end
34+
app.end_shape(PConstants::CLOSE)
35+
# draw bottom of the tube
36+
app.begin_shape
37+
(0..SIDES).each do |i|
38+
y = DegLut.cos(i * ANGLE) * RADIUS
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x = DegLut.sin(i * ANGLE) * RADIUS
40+
app.vertex(x, LENGTH, y)
41+
end
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app.end_shape(PConstants::CLOSE)
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# draw SIDES
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app.begin_shape(PConstants::TRIANGLE_STRIP)
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(0..SIDES).each do |i|
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y = DegLut.cos(i * ANGLE) * RADIUS
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x = DegLut.sin(i * ANGLE) * RADIUS
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app.vertex(x, 0, y)
49+
app.vertex(x, LENGTH, y)
50+
end
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app.end_shape(PConstants::CLOSE)
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end
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def draw_z_axis
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# draw top of the tube
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app.begin_shape
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(0..SIDES).each do |i|
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x = DegLut.cos(i * ANGLE) * RADIUS
59+
y = DegLut.sin(i * ANGLE) * RADIUS
60+
app.vertex(0, x, y)
61+
end
62+
app.end_shape(PConstants::CLOSE)
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# draw bottom of the tube
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app.begin_shape
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(0..SIDES).each do |i|
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x = DegLut.cos(i * ANGLE) * RADIUS
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y = DegLut.sin(i * ANGLE) * RADIUS
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app.vertex(LENGTH, x, y)
69+
end
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app.end_shape(PConstants::CLOSE)
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# draw SIDES
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app.begin_shape(PConstants::TRIANGLE_STRIP)
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(0..SIDES).each do |i|
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x = DegLut.cos(i * ANGLE) * RADIUS
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y = DegLut.sin(i * ANGLE) * RADIUS
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app.vertex(0, x, y)
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app.vertex(LENGTH, x, y)
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end
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app.end_shape(PConstants::CLOSE)
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end
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82+
def draw_x_axis
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# draw top of the tube
84+
app.begin_shape
85+
(0..SIDES).each do |i|
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x = DegLut.cos(i * ANGLE) * RADIUS
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y = DegLut.sin(i * ANGLE) * RADIUS
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app.vertex(x, y, 0)
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end
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app.end_shape(PConstants::CLOSE)
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# draw bottom of the tube
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app.begin_shape
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(0..SIDES).each do |i|
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x = DegLut.cos(i * ANGLE) * RADIUS
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y = DegLut.sin(i * ANGLE) * RADIUS
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app.vertex(x, y, LENGTH)
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end
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app.end_shape(PConstants::CLOSE)
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# draw SIDES
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app.begin_shape(PConstants::TRIANGLE_STRIP)
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(0..SIDES).each do |i|
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x = DegLut.cos(i * ANGLE) * RADIUS
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y = DegLut.sin(i * ANGLE) * RADIUS
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app.vertex(x, y, 0)
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app.vertex(x, y, LENGTH)
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end
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app.end_shape(PConstants::CLOSE)
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end
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end

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