Method: Scale#draw_xy_scale

Defined in:
lib/scale.rb

#draw_xy_scale(data, data_description, y_serie_name, x_serie_name, r, g, b, with_margin = 0, angle = 0, decimals = 1) ⇒ Object

This function is used by scatter charts. It will compute everything needed to draw the associated line and plot charts. You must specify the name of the two series that will be used as X and Y data. By default this function will compute the min & max values of both series, anyway you can override the automatic scaling by calling first the setFixedScale function.



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# File 'lib/scale.rb', line 279

def draw_xy_scale(data,data_description,y_serie_name,x_serie_name,r,g,b,with_margin=0,angle=0,decimals=1)

  self.validate_data("draw_xy_scale",data)
  c_text_color         = allocate_color(@picture,r,g,b)
  self.draw_line(@g_area_x1,@g_area_y1,@g_area_x1,@g_area_y2,r,g,b)
  self.draw_line(@g_area_x1,@g_area_y2,@g_area_x2,@g_area_y2,r,g,b)

  # Process Y scale */
  if(@vmin.nil? && @vmax.nil?)
    @vmin = data[0][y_serie_name]
    @vmax = data[0][y_serie_name]
    data.each do |key|
      if !key[y_serie_name].nil?
        value = key[y_serie_name]
        if (value.is_a?(Numeric))
          @vmax = value if ( @vmax < value)
          @vmin = value  if ( @vmin > value)
        end
      end
    end

    if(@vmax.is_a?(String))
      @vmax = @vmax.gsub(/\.[0-9]+/,'')+1 if (@vmax > @vmax.gsub(/\.[0-9]+/,'') )
    end
    data_range = @vmax - @vmin
    data_range = 0.1 if (data_range.to_f == 0.0 )

    #Compute automatic scaling
    scale_ok = false
    factor = 1
    min_div_height = 25
    max_divs = (@g_area_y2 - @g_area_y1)*1.0 / min_div_height
    if (@vmin == 0 && @vmax == 0 )
      @vmin = 0
      @vmax = 2
      scale = 1
      divisions = 2
    elsif (max_divs > 1)
      while(!scale_ok)
        scale1 = ( @vmax - @vmin )*1.0 / factor
        scale2 = ( @vmax - @vmin )*1.0 /factor / 2
        scale4 = ( @vmax - @vmin )*1.0 / factor / 4

        if ( scale1 > 1 && scale1 <= max_divs && !scale_ok)
          scale_ok = true
          divisions = (scale1).floor
          scale = 1
        end
        if ( scale2 > 1 && scale2 <= max_divs && !scale_ok)
          scale_ok = true
          divisions = (scale2).floor
          scale = 2
        end
        if (!scale_ok)
          factor = factor * 10.0  if ( scale2 > 1 )
          factor = factor / 10.0  if ( scale2 < 1 )
        end
      end
      if ((((@vmax*1.0 / scale) / factor)).floor != ((@vmax*1.0 / scale) / factor))
        grid_id     = ( @vmax*1.0 / scale / factor).floor  + 1
        @vmax       = grid_id * scale * factor
        divisions   = divisions+1
      end

      if (((@vmin*1.0 / scale) / factor).floor != ((@vmin*1.0 / scale) / factor))

        grid_id     = ( @vmin*1.0 / scale / factor).floor
        @vmin       = grid_id * scale * factor*1.0
        divisions   = divisions+1
      end

    else #/* Can occurs for small graphs */
      scale = 1
    end
    divisions = 2 if ( divisions.nil? )

    if ( is_real_int((@vmax-@vmin)/(divisions-1)))
      divisions-=1
    elsif ( is_real_int((@vmax-@vmin)/(divisions+1)))
      divisions+=1
    end
  else
    divisions = @divisions
  end
  @division_count = divisions

  data_range = @vmax - @vmin
  data_range = 0.1  if (data_range.to_f == 0.0 )
  @division_height = ( @g_area_y2 - @g_area_y1 )*1.0 / divisions
  @division_ratio  = ( @g_area_y2 - @g_area_y1 )*1.0 /data_range
  ypos = @g_area_y2
  xmin = nil
  i =1

  while(i<= divisions+1)
    self.draw_line(@g_area_x1,ypos,@g_area_x1-5,ypos,r,g,b)
    value     = @vmin*1.0 + (i-1) * (( @vmax - @vmin ) / divisions)
    value = value.round(decimals)
    value = value.round if value.floor == value.ceil
    value = "#{value} #{data_description['unit']['y']}"  if ( data_description["format"]["y"]== "number")
    value = self.to_time(value)                  if ( data_description["format"]["y"] == "time" )
    value = self.to_date(value)                  if ( data_description["format"]["y"] == "date" )
    value = self.to_metric(value)                if ( data_description["format"]["Y"] == "metric" )
    value = self.to_currency(value)             if ( data_description["format"]["Y"] == "currency" )

    position  = image_ftb_box(@font_size,0,@font_name,value)
    text_width =position[2]-position[0]
    image_ttf_text(@picture,@font_size,0,@g_area_x1-10-text_width,ypos+(@font_size/2),c_text_color,@font_name,value)
    xmin = @g_area_x1-10-text_width if (  xmin.nil? || xmin > @g_area_x1-10-text_width)
    ypos = ypos - @division_height
    i = i+1

  end

  # Process X scale */
  if(@v_x_min.nil? && @v_x_max.nil?)

    @v_x_min =data[0][x_serie_name]
    @v_x_max =data[0][x_serie_name]
    data.each do |key|

      if !key[x_serie_name].nil?
        value = key[x_serie_name]
        if (value.is_a?(Numeric))

          @v_x_max = value if ( @v_x_max < value)
          @v_x_min = value  if ( @v_x_min > value)
        end
      end
    end

    if (@v_x_max.is_a?(String))
      @v_x_max = @v_x_max.gsub(/\.[0-9]+/,'')+1 if (@v_x_max > @v_x_max.gsub(/\.[0-9]+/,'') )
    end

    data_range = @vmax - @vmin
    data_range = 0.1 if (data_range.to_f == 0.0 )

    # Compute automatic scaling
    scale_ok = false
    factor = 1
    min_div_width = 25
    max_divs = (@g_area_x2 - @g_area_x1) / min_div_width

    if ( @v_x_min == 0 && @v_x_max == 0 )
      @v_x_min = 0
      @v_x_max = 2
      scale = 1
      x_divisions = 2
    elsif (max_divs > 1)

      while(!scale_ok)
        scale1 = ( @v_x_max - @v_x_min ) / factor
        scale2 = ( @v_x_max - @v_x_min ) / factor / 2
        scale4 = ( @v_x_max - @v_x_min ) / factor / 4
        if ( scale1 > 1 && scale1 <= max_divs && !scale_ok)
          scale_ok = true
          x_divisions = (scale1).floor
          scale = 1
        end

        if ( scale2 > 1 && scale2 <= max_divs && !scale_ok)
          scale_ok = true
          x_divisions = (scale2).floor

          scale = 2
        end
        if (!scale_ok)
          factor = factor * 10 if ( scale2 > 1 )
          factor = factor / 10  if ( scale2 < 1 )
        end
      end

      if ( (@v_x_max*1.0 / scale / factor).floor != @v_x_max / scale / factor)
        grid_id     =  ( @v_x_max*1.0 / scale / factor).floor + 1
        @v_x_max = grid_id * scale * factor
        x_divisions+=1
      end

      if ( (@v_x_min*1.0 / scale / factor).floor != @v_x_min / scale / factor)
        grid_id     = ( @v_x_min / scale / factor).floor
        @v_x_min = grid_id * scale * factor
        x_divisions+=1
      end
    else #/* Can occurs for small graphs */
      scale = 1
    end
    x_divisions = 2 if ( x_divisions.nil? )

    if ( is_real_int((@v_x_max-@v_x_min)/(x_divisions-1)))
      x_divisions-=1
    elsif ( is_real_int((@v_x_max-@v_x_min)/(x_divisions+1)))
      x_divisions+=1
    end
  else

    x_divisions = @x_divisions
  end

  @x_division_count = divisions
  @data_count      = divisions + 2

  x_data_range = @v_x_max - @v_x_min
  x_data_range = 0.1   if ( x_data_range == 0 )

  @division_width   = ( @g_area_x2 - @g_area_x1 ) / x_divisions
  @x_division_ratio  = ( @g_area_x2 - @g_area_x1 ) / x_data_range
  xpos = @g_area_x1
  ymax =nil
  i=1

  while(i<= x_divisions+1)
    self.draw_line(xpos,@g_area_y2,xpos,@g_area_y2+5,r,g,b)
    value = @v_x_min + (i-1) * (( @v_x_max - @v_x_min ) / x_divisions)
    value = value.round(decimals)
    value = value.round if value.floor == value.ceil
    value = "#{value}#{data_description['unit']['y']}"  if ( data_description["format"]["y"] == "number")
    value = self.to_time(value)                  if ( data_description["format"]["y"] == "time" )
    value = self.to_date(value)                  if ( data_description["format"]["y"] == "date" )
    value = self.to_metric(value)                if ( data_description["format"]["Y"] == "metric" )
    value = self.to_currency(value)             if ( data_description["format"]["Y"] == "currency" )
    position  = image_ftb_box(@font_size,angle,@font_name,value)
    text_width =position[2].abs+position[0].abs
    text_height = position[1].abs+position[3].abs

    if ( angle == 0 )
      ypos = @g_area_y2+18
      image_ttf_text(@picture,@font_size,angle,(xpos).floor-(text_width/2).floor,ypos,c_text_color,@font_name,value)
    else

      ypos = @g_area_y2+10+text_height
      if ( angle <= 90 )
        image_ttf_text(@picture,@font_size,angle,(xpos).floor-text_width+5,ypos,c_text_color,@font_name,value)
      else
        image_ttf_text(@picture,@font_size,angle,(xpos).floor+text_width+5,ypos,c_text_color,@font_name,value)
      end

    end

    ymax = ypos if (ymax.nil? || ymax < ypos)
    i=i+1
    xpos = xpos + @division_width
  end
  #Write the Y Axis caption if set
  if ((!data_description["axis"].nil? && !data_description["axis"]["y"].nil?) )
    position   = image_ftb_box(@font_size,90,@font_name,data_description["axis"]["y"])
    text_height  = (position[1]).abs+(position[3]).abs
    text_top   = ((@g_area_y2 - @g_area_y1) / 2) + @g_area_y1 + (text_width/2)
    image_ttf_text(@picture,@font_size,90,xmin-@font_size,text_top,c_text_color,@font_name,data_description["axis"]["y"].to_s)
  end
  if ((!data_description["axis"].nil? && !data_description["axis"]["x"].nil?) )
    position   = image_ftb_box(@font_size,90,@font_name,data_description["axis"]["x"])
    text_width  = (position[2]).abs+(position[0]).abs
    text_left   = ((@g_area_x2 - @g_area_x1) / 2) + @g_area_x1 + (text_width/2)
    image_ttf_text(@picture,@font_size,0,text_left,ymax+@font_size+5,c_text_color,@font_name,data_description["axis"]["x"].to_s)
  end

end