Class: HeatLoss::ChartExporter

Inherits:
BaseService
  • Object
show all
Defined in:
app/services/heat_loss/chart_exporter.rb

Overview

Service to export Highcharts configurations to PNG images
Uses the Highcharts Export Server API to convert chart configs to images

Defined Under Namespace

Classes: Result

Constant Summary collapse

EXPORT_URL =

URL for export.

'https://export.highcharts.com/'
REFERER =

Referer.

'https://www.warmlyyours.com/'
USER_AGENT =

User agent.

'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36'

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.month_chart_config(heat_loss) ⇒ Hash

Build a column chart configuration for heat loss vs heat supply by month

Parameters:

  • heat_loss (Hash) —

    Heat loss calculation data

Returns:

  • (Hash) —

    Highcharts column chart configuration



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# File 'app/services/heat_loss/chart_exporter.rb', line 92

def self.month_chart_config(heat_loss)
  months = %w[Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec]
  hl_averages = (heat_loss['hlc_averages'] || []).map { |o| o['heat_loss'].round }
  heat_supplied = (heat_loss['heat_supplied'] || []).map { |o| o['heat_supplied'].round }

  {
    chart: { type: 'column', width: 500, height: 300, backgroundColor: '#ffffff' },
    title: { text: 'Heat Loss vs. Heat Supply' },
    xAxis: { categories: months, crosshair: true },
    yAxis: { title: { text: 'BTU/hour' } },
    series: [
      { name: 'Heat Loss', data: hl_averages, color: '#FF6B6B' },
      { name: 'Heat Supplied', data: heat_supplied, color: '#4ECDC4' }
    ],
    credits: { enabled: false }
  }
end

.pie_chart_config(heat_loss) ⇒ Hash

Build a pie chart configuration for heat loss by type

Parameters:

  • heat_loss (Hash) —

    Heat loss calculation data

Returns:

  • (Hash) —

    Highcharts pie chart configuration



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# File 'app/services/heat_loss/chart_exporter.rb', line 66

def self.pie_chart_config(heat_loss)
  pie_data = (heat_loss['hlc_by_object'] || []).map do |o|
    { name: o['name'], y: o['heat_loss'].round, color: o['color'] }
  end

  {
    chart: { type: 'pie', width: 400, height: 300, backgroundColor: '#ffffff' },
    title: { text: 'Heat Loss by Type' },
    plotOptions: {
      pie: {
        allowPointSelect: true,
        cursor: 'pointer',
        dataLabels: {
          enabled: true,
          format: '<b>{point.name}</b>: {point.y} BTU/hr'
        }
      }
    },
    series: [{ name: 'Heat Loss', colorByPoint: true, data: pie_data }],
    credits: { enabled: false }
  }
end

.temp_chart_config(room, heat_loss) ⇒ Hash

Build a line chart configuration for room vs outside temperature

Parameters:

  • room (RoomConfiguration) —

    The room configuration

  • heat_loss (Hash) —

    Heat loss calculation data

Returns:

  • (Hash) —

    Highcharts line chart configuration



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# File 'app/services/heat_loss/chart_exporter.rb', line 114

def self.temp_chart_config(room, heat_loss)
  months = %w[Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec]
  desired_temps = (heat_loss['avg_temperatures'] || []).map { |_o| room.desired_temperature.round }
  ambient_temps = (heat_loss['ambient_temperatures'] || []).map { |o| o['temperature'].round }
  avg_temps = (heat_loss['avg_temperatures'] || []).map { |o| o['temperature'].round }

  {
    chart: { type: 'line', width: 500, height: 300, backgroundColor: '#ffffff' },
    title: { text: 'Room vs. Outside Temperature' },
    xAxis: { categories: months },
    yAxis: { title: { text: 'Temperature (°F)' } },
    series: [
      { name: 'Desired Temperature', data: desired_temps, color: '#FF6B6B', dashStyle: 'Dash' },
      { name: 'Average Room Temperature', data: ambient_temps, color: '#4ECDC4' },
      { name: 'Outside Temperature', data: avg_temps, color: '#95A5A6' }
    ],
    credits: { enabled: false }
  }
end

Instance Method Details

#process(chart_config:, width: 400, height: 300, type: 'image/png') ⇒ Result

Export a chart configuration to PNG image data

Parameters:

  • chart_config (Hash) —

    Highcharts chart configuration

  • width (Integer) (defaults to: 400) —

    Chart width in pixels

  • height (Integer) (defaults to: 300) —

    Chart height in pixels

  • type (String) (defaults to: 'image/png') —

    Output type ('image/png' or 'image/svg+xml')

Returns:

  • (Result) —

    with image_data (binary string) or error



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# File 'app/services/heat_loss/chart_exporter.rb', line 29

def process(chart_config:, width: 400, height: 300, type: 'image/png')
  response = connection.post do |req|
    req.body = {
      'options' => chart_config.to_json,
      'type' => type,
      'width' => width.to_s,
      'height' => height.to_s
    }
  end

  if response.success?
    Result.new(
      success: true,
      image_data: response.body,
      content_type: response.headers['content-type'],
      error: nil
    )
  else
    Result.new(
      success: false,
      image_data: nil,
      content_type: nil,
      error: "HTTP #{response.status}: #{response.body&.truncate(200)}"
    )
  end
rescue Faraday::Error => e
  Result.new(
    success: false,
    image_data: nil,
    content_type: nil,
    error: "#{e.class}: #{e.message}"
  )
end