Method: HDLRuby::Viz::Node#arrow_svg

Defined in:
lib/HDLRuby/hruby_viz.rb

#arrow_svg(x0, y0, x1, y1) ⇒ Object

Generate an arrow description SVG text for connection nodes. +x0+, +y0+, +x1+ and +y1+ are the coordinates of the arrow.



3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
 
# File 'lib/HDLRuby/hruby_viz.rb', line 3794

def arrow_svg(x0,y0,x1,y1)
  # Draw the line.
    # Vertical part
  res =  "<line stroke=\"#000\" " +
    "stroke-width=\"#{@scale/12.0}\" stroke-linecap=\"round\" " +
    "x1=\"#{x0*@scale}\" " +
    "y1=\"#{y0*@scale}\" " +
    "x2=\"#{x0*@scale}\" " +
    "y2=\"#{y1*@scale}\" " +
    "/>\n"
    # Horizontal part
  res += "<line stroke=\"#000\" " +
    "stroke-width=\"#{@scale/12.0}\" stroke-linecap=\"round\" " +
    "x1=\"#{x0*@scale}\" " +
    "y1=\"#{y1*@scale}\" " +
    "x2=\"#{x1*@scale}\" " +
    "y2=\"#{y1*@scale}\" " +
    "/>\n"
  # The head.
  if x0 == x1 then
    # Vertical case
    res += "<polygon fill=\"#000\" stroke=\"none\" " +
      "points=\"#{(x1-1/4.0)*@scale},#{(y1-1/2.0-1/8.0)*@scale} " +
      "#{(x1+1/4.0)*@scale},#{(y1-1/2.0-1/8.0)*@scale} " +
      "#{(x1)*@scale},#{(y1)*@scale}\"/>\n"
  elsif x0 < x1 then
    # Horizontal left case: always end horizontally.
    res += "<polygon fill=\"#000\" stroke=\"none\" " +
      "points=\"#{(x1-1/2.0)*@scale},#{(y1-1/4.0)*@scale} " +
      "#{(x1-1/2.0)*@scale},#{(y1+1/4.0)*@scale} " +
      "#{(x1+1/8.0)*@scale},#{(y1)*@scale}\"/>\n"
  else
    # Horizontal right case: always end horizontally.
    res += "<polygon fill=\"#000\" stroke=\"none\" " +
      "points=\"#{(x1)*@scale},#{(y1+1/4.0)*@scale} " +
      "#{(x1)*@scale},#{(y1-1/4.0)*@scale} " +
      "#{(x1-1/8.0-1/2.0)*@scale},#{(y1)*@scale}\"/>\n"
  end
  return res
end