Module: SkippyLib::DrawingHelper

Extended by:
DrawingHelper
Included in:
DrawingHelper
Defined in:
modules/drawing_helper.rb

Overview

Since:

  • 3.0.0

Instance Method Summary collapse

Instance Method Details

#adjust_to_pixel_grid(points, mid_pixel = false) ⇒ Array<Geom::Point3d>

Parameters:

  • points (Array<Geom::Point3d>)
  • mid_pixel (Boolean) (defaults to: false)

Returns:

  • (Array<Geom::Point3d>)

Since:

  • 3.0.0



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# File 'modules/drawing_helper.rb', line 15

def adjust_to_pixel_grid(points, mid_pixel = false)
  points.map { |point|
    point.x = point.x.to_i
    point.y = point.y.to_i
    point.z = point.z.to_i
    if mid_pixel
      point.x -= 0.5
      point.y -= 0.5
      point.z -= 0.5
    end
    point
  }
end

#draw2d_point(view, point, size) ⇒ Nil

TODO:

Change this to accept an array of vertices/points.

Draw 2D squares which are adjusted to the pixel grid.

Parameters:

  • view (Sketchup::View)
  • point (Enumerable<Geom::Point3d>)
  • size (Integer)

Returns:

  • (Nil)

Since:

  • 3.0.0



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# File 'modules/drawing_helper.rb', line 125

def draw2d_point(view, point, size)
  half_size = size / 2.0
  # rubocop:disable Layout/SpaceInsideArrayLiteralBrackets
  points = [
    point.offset([-half_size, -half_size, 0]),
    point.offset([ half_size, -half_size, 0]),
    point.offset([ half_size,  half_size, 0]),
    point.offset([-half_size,  half_size, 0]),
  ]
  # rubocop:enable Layout/SpaceInsideArrayLiteralBrackets
  points = adjust_to_pixel_grid(points)
  view.draw2d(GL_QUADS, points)
  nil
end

#draw_edges(view, edges, width = 1, color = nil) ⇒ Object

Parameters:

  • view (Sketchup::View)
  • edges (Enumerable<Sketchup::Edge>)
  • width (Integer) (defaults to: 1)
  • color (Sketchup::Color) (defaults to: nil)

Since:

  • 3.0.0



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# File 'modules/drawing_helper.rb', line 61

def draw_edges(view, edges, width = 1, color = nil)
  color ||= view.model.rendering_options['ForegroundColor']
  points = edges.map { |edge|
    edge.vertices.map { |vertex|
      offset_toward_camera(view, vertex.position)
    }
  }
  points.flatten!
  view.drawing_color = color
  view.line_width = width
  view.line_stipple = ''
  view.draw(GL_LINES, points)
  nil
end

#draw_points(view, points, size) ⇒ Nil

Because the SU API doesn't let one set the Point size and style when drawing 3D points the vertices are simulated by using GL_LINES instead. There is a slight overhead by generating the new points like this, but it's the only solution at the moment.

Parameters:

  • view (Sketchup::View)
  • points (Enumerable<Geom::Point3d, Sketchup::Vertex>)
  • size (Integer)

Returns:

  • (Nil)

Since:

  • 3.0.0



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# File 'modules/drawing_helper.rb', line 86

def draw_points(view, points, size)
  return nil if points.empty?

  segments = []
  # Draw each point as a line segment. It's currently a workaround as the
  # SketchUp Ruby API doesn't give enough control for drawing points.
  camera_right = view.camera.direction.axes.x
  camera_left = camera_right.reverse
  toward_camera = view.camera.direction.reverse
  # Offset the points a little bit so they don't disappear into the
  # mesh. The offset distance is picked by experimenting with what looked
  # good. It might not scale properly for all sizes.
  screen_offset_distance = (size / 3.0).to_i
  points.each { |point|
    point = point.position if point.is_a?(Sketchup::Vertex)
    # Calculate the offset position for the vertex relative to the camera.
    offset_distance = view.pixels_to_model(screen_offset_distance, point)
    camera_point = point.offset(toward_camera, offset_distance)
    # Calculate the world coordinates for the vertex in order to draw it in
    # the given screen size.
    offset = view.pixels_to_model(size / 2.0, camera_point)
    segments << camera_point.offset(camera_left, offset)
    segments << camera_point.offset(camera_right, offset)
  }
  view.line_stipple = ''
  view.line_width = size
  view.draw(GL_LINES, segments)
  nil
end

#offset_toward_camera(view, point) ⇒ Geom::Point3d

Parameters:

  • view (Sketchup::View)
  • point (Geom::Point3d)

Returns:

  • (Geom::Point3d)

Since:

  • 3.0.0



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# File 'modules/drawing_helper.rb', line 33

def offset_toward_camera(view, point)
  # Model.pixels_to_model converts argument to integers. So in order to get
  # a fraction we compute that from the result.
  size = view.pixels_to_model(1, point) * 0.01
  point.offset(view.camera.direction.reverse!, size)
end

#screen_point(screen_point, line_width) ⇒ Object

Ensures the given screen point is adjusted to the screen pixel grid. Drawing odd width lines require the pixel coordinate to be in the centre of the pixel in order for it to be drawn crisp when anti-aliasing is enabled.

Since:

  • 3.0.0



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# File 'modules/drawing_helper.rb', line 46

def screen_point(screen_point, line_width)
  odd_line_width = line_width.to_i.odd?
  adjustment = odd_line_width ? 0.5 : 0.0
  corrected_point = screen_point.clone
  corrected_point.x = corrected_point.x.to_i + adjustment
  corrected_point.y = corrected_point.y.to_i + adjustment
  corrected_point.z = 0.0
  corrected_point
end