private async Task <bool> SetupColourComboBoxes()
{
bool success = true;
if (_datasetModel.ColourValueCheck(_colourIndex))
{
int nClassesValue = 0;
// colour values are qualitative
// hide number of data classes and colour scheme type combo boxes
// as they are not required, the values have been automatically derived from the data
numDataClassesTextBlock.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
numDataClassesComboBox.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
colourSchemeTypeTextBlock.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
colourSchemeTypeComboBox.Visibility = Windows.UI.Xaml.Visibility.Collapsed;
_distinctCategories = _datasetModel.Dataset.Select(o => o[_colourIndex]).Distinct().ToList();
nClassesValue = _distinctCategories.Count();
if (nClassesValue > 12)
{
// too many categories for a colorbrewer scheme
success = false;
await new MessageDialog("The colour scheme supports a maximum of 12 categories for optimum visualisation refinement",
"More than 12 distinct categories").ShowAsync();
}
// set default colour scheme selections
colourSchemeTypeComboBox.SelectedItem = "Qualitative";
colourSchemeComboBox.DataContext = _colourScheme.GetColourSchemes(nClassesValue, "Qualitative");
List <string> items = (List <string>)colourSchemeComboBox.ItemsSource;
colourSchemeComboBox.SelectedItem = items[0];
}
else
{
// colour values are not qualitative
List <string> colourSchemeTypes = new List <string>();
colourSchemeTypes.Add("Sequential single hue");
colourSchemeTypes.Add("Sequential multi hue");
colourSchemeTypes.Add("Diverging");
colourSchemeTypeComboBox.DataContext = colourSchemeTypes;
// set default colour scheme selections
colourSchemeTypeComboBox.SelectedValue = "Sequential single hue";
colourSchemeComboBox.DataContext = _colourScheme.GetColourSchemes(DEFAULT_NUM_DATA_CLASSES, "Sequential single hue");
colourSchemeComboBox.SelectedValue = "Grey";
}
return(success);
}
private async void Heatmap_Loaded(object sender, RoutedEventArgs e)
{
if (await CheckPropertiesAreSet())
{
_screenWidth = dataListView.ActualWidth - FIRST_ROW_WIDTH;
// setup colour scheme combo box with default values
colourSchemeComboBox.DataContext = _colourScheme.GetColourSchemes(DEFAULT_NUM_DATA_CLASSES, "Sequential single hue");
colourSchemeComboBox.SelectedValue = "Blue";
// Assign event handlers
numDataClassesComboBox.SelectionChanged += numDataClassesComboBox_SelectionChanged;
colourSchemeTypeComboBox.SelectionChanged += colourSchemeTypeComboBox_SelectionChanged;
colourSchemeComboBox.SelectionChanged += colourSchemeComboBox_SelectionChanged;
Initialise();
}
}