Method: GraphHelper#draw_dotted_line

Defined in:
lib/graph_helper.rb

#draw_dotted_line(x1, y1, x2, y2, dot_size, r, g, b, graph_function = false) ⇒ Object

This function will draw an aliased dotted line between points (x1,y1) and (x2,y2). Parameter #5 is used to specify the dot size ( 2 will draw 1 point every 2 points ) The last 3 parameters are used to set the line color.



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# File 'lib/graph_helper.rb', line 326

def draw_dotted_line(x1,y1,x2,y2,dot_size,r,g,b,graph_function=false)
  b, g, r = validate_color(b, g, r)
  distance = Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1))
  x_step = (x2-x1) / distance
  y_step = (y2-y1) / distance
  dot_index = 0
  i = 0
  start_offset = 0

  while(i<=distance)
    x = i * x_step  + x1
    y = i * y_step + y1
    if ( dot_index <= dot_size)
      if ( (x >= @g_area_x1 && x <= @g_area_x2 && y >= @g_area_y1 && y <= @g_area_y2) || !graph_function )
        if (@line_width == 1 )
          draw_antialias_pixel(x,y,r,g,b)
        else
          start_offset = start_offset -(@line_width/2)
          end_offset = (@line_width/2)
          j = start_offset
          while(j<= end_offset)
            draw_antialias_pixel(x+j,y+j,r,g,b)
            j= j+1
          end
        end
      end
    end
    dot_index = dot_index+1
    dot_index = 0 if (dot_index == dot_size * 2)
    i= i+1
  end

end