public FormResistorHelper()
{
InitializeComponent();
if (File.Exists("autosave.txt"))
{
listBoxResistors.Items.AddRange(File.ReadLines("autosave.txt").Select(Resistor.FromTsv).ToArray());
Resistor.ResetSearchCache();
}
}
/// <summary>
/// Enter-Taste, wenn ein neuer Widerstandwert hinzugefügt werden soll
/// </summary>
void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar == '\r')
{
var p = Resistor.Parse(textBoxValue.Text);
if (p != null)
{
p.ident = textBoxIdent.Text;
textBoxIdent.Text = Increment(textBoxIdent.Text);
int insertPos = 0;
while (insertPos < listBoxResistors.Items.Count && ((Resistor)listBoxResistors.Items[insertPos]).valueMilliOhm < p.valueMilliOhm)
{
insertPos++;
}
listBoxResistors.Items.Insert(insertPos, p);
AutoSave(listBoxResistors.Items.Cast <Resistor>().ToArray());
}
}
}
/// <summary>
/// Änderung der Sucheingabe
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void textBoxSearch_TextChanged(object sender, EventArgs e)
{
var val = Resistor.Parse(textBoxSearch.Text);
if (val == null)
{
return;
}
int searchType = radioButtonSearchType1.Checked ? 1 : radioButtonSearchType2.Checked ? 2 : radioButtonSearchType3.Checked ? 3 : radioButtonSearchType4.Checked ? 4 : radioButtonSearchType5.Checked ? 5 : radioButtonSearchType6.Checked ? 6 : 0;
if (searchType == 0)
{
throw new ArgumentException("searchType");
}
const int TargetLimit = 1000;
var time = Stopwatch.StartNew();
ResistorResult[] results = null;
foreach (double searchLevel in new[] { 1.0001, 1.0002, 1.0005, 1.001, 1.002, 1.005, 1.01, 1.02, 1.05, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 9999999.9 })
{
results = Resistor.Search(listBoxResistors.Items.Cast <Resistor>().ToArray(), val, searchType, searchLevel).Take(TargetLimit).ToArray();
if (results.Length >= TargetLimit / 2)
{
break; // mindestens die Hälfte an Ergebnissen erreicht?
}
}
Array.Sort(results, (x, y) => x.errorMilliOhm.CompareTo(y.errorMilliOhm));
time.Stop();
Text = "Search-Time: " + time.ElapsedMilliseconds.ToString("N0", CultureInfo.InvariantCulture) + " ms";
listBoxSearchResults.BeginUpdate();
listBoxSearchResults.Items.Clear();
listBoxSearchResults.Items.AddRange(results);
listBoxSearchResults.EndUpdate();
}
/// <summary>
/// Suchmethode, um passende Widerstände bzw. deren Kombinationen zu finden
/// </summary>
/// <param name="allResistors">Alle Widerstände, welche zur Verfügung stehen</param>
/// <param name="searchValue">gesuchter Widerstandswert</param>
/// <param name="maxResistors">optional: gibt die maximale Anzahl der kombinierbaren Widerstände an, welche verwendet werden dürfen (default: 2)</param>
/// <param name="maxError">optional: maximale Abweichung des Ergebnisses (default: 1.10 = 10 % Abweichung)</param>
/// <returns>Enumerable der gefundenen Ergebnisse</returns>
public static IEnumerable <ResistorResult> Search(Resistor[] allResistors, Resistor searchValue, int maxResistors = 2, double maxError = 1.10)
{
if (allResistors.Length < 2)
{
yield break;
}
long search = searchValue.valueMilliOhm;
long max = (long)(search * maxError) - search;
foreach (var r in allResistors)
{
long err = Math.Abs(r.valueMilliOhm - search);
if (err <= max)
{
yield return(new ResistorResult(r, err));
}
}
var fullList = GetAllDoubles(allResistors);
var fullRevList = GetAllRevDoubles(allResistors);
if (maxResistors >= 2) // 2-teilige Suche
{
int p = BinarySearch(fullList, search - max);
while (p < fullList.Length && fullList[p].Key - search < max)
{
yield return(new ResistorResult(fullList[p].Value, Math.Abs(search - fullList[p].Key)));
p++;
}
}
if (maxResistors >= 3)
{
// --- 3er Kombination - seriell ---
for (int z = 0; z < allResistors.Length - 2; z++)
{
for (int y = z + 1; y < allResistors.Length - 1; y++)
{
for (int x = y + 1; x < allResistors.Length; x++)
{
long err = Math.Abs(allResistors[x].valueMilliOhm + allResistors[y].valueMilliOhm + allResistors[z].valueMilliOhm - search);
if (err <= max)
{
yield return(new ResistorResult(new ResistorCombined(true, allResistors[x], allResistors[y], allResistors[z]), err));
}
}
}
}
// --- 3er Kombination - parallel ---
for (int z = 0; z < allResistors.Length - 2; z++)
{
for (int y = z + 1; y < allResistors.Length - 1; y++)
{
for (int x = y + 1; x < allResistors.Length; x++)
{
var c = new ResistorCombined(false, allResistors[x], allResistors[y], allResistors[z]);
long err = Math.Abs(c.valueMilliOhm - search);
if (err <= max)
{
yield return(new ResistorResult(c, err));
}
}
}
}
}
}
/// <summary>
/// Konstruktor
/// </summary>
/// <param name="resultResistor">Widerstand oder eine Kombination, welcher als Ergebnis gefunden wurde</param>
/// <param name="errorMilliOhm">Fehler-Abstand in milli-Ohm</param>
public ResistorResult(Resistor resultResistor, long errorMilliOhm)
{
this.resultResistor = resultResistor;
resultMilliOhm = resultResistor.valueMilliOhm;
this.errorMilliOhm = errorMilliOhm;
}
/// <summary>
/// speichert automatisch alle Widerstände
/// </summary>
/// <param name="resistors">Widerstände, welche gespeichert werden sollen</param>
static void AutoSave(Resistor[] resistors)
{
File.WriteAllLines("autosave.txt", resistors.Select(x => x.ToTsv()));
Resistor.ResetSearchCache();
}