private void TheImage_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
// Get the hue index ( zero based )
SelectedColor = GetHueIndex(e.X, e.Y);
// Handle selection of hues
if (!(ShiftPressed() || ControlPressed()))
{
if ((SelectedHues.Count == 1) && (SelectedHues.Contains(SelectedColor)))
{
SelectedHues.Clear();
DrawSelectionChart();
return;
}
// No modifier keys pressed. Clear selection and add current item
SelectedHues.Clear();
SelectedHues.Add(SelectedColor);
PreviousSelectedColor = SelectedColor;
DrawSelectionChart();
return;
}
if (SelectedHues.Contains(SelectedColor))
{
// Clicking the same just deselects it
SelectedHues.Remove(SelectedColor);
if (ShiftPressed())
{
// Go down
if (SelectedHues.Contains((SelectedColor + 1)))
{
for (int i = (SelectedColor + 1); i <= PreviousSelectedColor; i++)
{
if (SelectedHues.Contains(i))
{
SelectedHues.Remove(i);
}
else
{
break;
}
}
}
}
PreviousSelectedColor = (SelectedColor - 1);
DrawSelectionChart();
return;
}
if (ControlPressed())
{
// Add a single item to the list
SelectedHues.Add(SelectedColor);
PreviousSelectedColor = SelectedColor;
DrawSelectionChart();
return;
}
if (ShiftPressed())
{
// Add a selection of items
if (PreviousSelectedColor < SelectedColor)
{
// Moving backwards
for (int i = SelectedColor; i > PreviousSelectedColor; i--)
{
if (!SelectedHues.Contains(i))
{
SelectedHues.Add(i);
}
}
}
if (PreviousSelectedColor > SelectedColor)
{
// Moving forward
for (int i = SelectedColor; i < PreviousSelectedColor; i++)
{
if (!SelectedHues.Contains(i)) // Avoid duplicates
{
SelectedHues.Add(i);
}
}
}
PreviousSelectedColor = SelectedColor;
DrawSelectionChart();
return;
}
}
public void ClearSelection()
{
SelectedHues.Clear();
SelectionChart = (Bitmap)Chart.Clone();
TheImage.Image = Chart;
}