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SketchUp Plugin: Sine Wave

Just a quick little plugin to draw a sine curve in SketchUp.

Draws a sine curve at the Origin and in a Group. User is asked for amplitude, length, and number of segments.

sine_wave.rb



on

1 comment:

  1. LunkwillJuly 17, 2010

    Here's an enhancement that adds cosine and tangent, and changes the amplitude and frequency to be floats instead of ints.

    # Copyright (C) 2010 Jim Foltz
    # Draw a Sine wave
    require "sketchup"

    module JF
    def self.clamp(y, max)
    if y > max
    y = max
    end
    if y < -max
    y = -max
    end
    return y
    end

    def self.draw_sine_wave
    prompts = %w( Length Amplitude Segments Function )
    defaults = [10.0, 5.0, 24, "Sine"]
    list = ['','','',"Sine|Cosine|Tan"]
    title = "Parameters"

    ret = UI.inputbox(prompts, defaults, list, title)
    return unless ret
    #a = 10.0.feet
    #b = 250.0.feet
    b = ret[0].to_l
    a = ret[1].to_l
    segments = ret[2].to_l
    f = ret[3]
    #b, a, segments, f = ret.map{|e| e.to_l}
    pts = []
    0.step(b, b/segments) do |x|
    y = 0.0
    case f
    when 'Sine'
    y = a * Math::sin( (x / b) * 2 * Math::PI)
    when 'Cosine'
    y = a * Math::cos( (x / b) * 2 * Math::PI)
    when 'Tan'
    y = Math::tan( (x / b) * 2 * Math::PI)
    y = clamp(y, a)
    end
    pts << [x, y]
    end
    Sketchup.active_model.start_operation("Trig Function")
    grp = Sketchup.active_model.active_entities.add_group
    entities = grp.entities
    entities.add_edges pts
    Sketchup.active_model.commit_operation

    end

    end
    unless file_loaded? "jf_trig.rb"
    UI.menu("Plugins").add_item("Trig functions") { JF.draw_sine_wave }
    file_loaded "jf_trig.rb"
    end

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