private void drawSingleStrecke(int i)
{
Line tempLine = new Line();
tempLine.Stroke = System.Windows.Media.Brushes.Red;
tempLine.StrokeThickness = 3;
cStrecken Strecke = meineStrecken[i];
tempLine.X1 = Strecke.Ep1X;
tempLine.Y1 = Strecke.Ep1Y;
tempLine.X2 = Strecke.Ep2X;
tempLine.Y2 = Strecke.Ep2Y;
CanvasEinlesen.Children.Add(tempLine);
}
private void miEinselen_Click(object sender, RoutedEventArgs e)
{
clearAll();
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.Filter = "Text Files|*.txt";
openFileDialog1.Title = "Select a Text File";
if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
string[] dateiinhalt = File.ReadAllLines(openFileDialog1.FileName);
for (int i = 1; i < dateiinhalt.Length; i++)
{
string[] tempCoord = dateiinhalt[i].Split(' ');
float tempEp1X = float.Parse(tempCoord[0], CultureInfo.InvariantCulture);
float tempEp1Y = float.Parse(tempCoord[1], CultureInfo.InvariantCulture);
float tempEp2X = float.Parse(tempCoord[2], CultureInfo.InvariantCulture);
float tempEp2Y = float.Parse(tempCoord[3], CultureInfo.InvariantCulture);
cStrecken tempStrecke = new cStrecken(tempEp1X, tempEp1Y, tempEp2X, tempEp2Y);
meineStrecken.Add(tempStrecke);
}
foreach (cStrecken Strecke in meineStrecken)
{
lbCoord.Items.Add("ID: " + Strecke.MyId + " P1: (" + Strecke.Ep1X + "|" + Strecke.Ep1Y + ") P2: (" + Strecke.Ep2X + "|" + Strecke.Ep2Y + ")");
Line tempLine = new Line();
tempLine.Stroke = System.Windows.Media.Brushes.Black;
tempLine.StrokeThickness = 3;
tempLine.X1 = Strecke.Ep1X;
tempLine.Y1 = Strecke.Ep1Y;
tempLine.X2 = Strecke.Ep2X;
tempLine.Y2 = Strecke.Ep2Y;
CanvasEinlesen.Children.Add(tempLine);
}
}
else
{
System.Windows.Forms.MessageBox.Show("Keine Datei gewählt");
}
}
private void FindIntersection(cStrecken linie1, cStrecken linie2,
out bool lines_intersect, out bool segments_intersect,
out PointF intersection,
out PointF close_p1, out PointF close_p2)
{
PointF p1 = new PointF(linie1.Ep1X, linie1.Ep1Y);
PointF p2 = new PointF(linie1.Ep2X, linie1.Ep2Y);
PointF p3 = new PointF(linie2.Ep1X, linie2.Ep1Y);
PointF p4 = new PointF(linie2.Ep2X, linie2.Ep2Y);
// Get the segments' parameters.
float dx12 = p2.X - p1.X;
float dy12 = p2.Y - p1.Y;
float dx34 = p4.X - p3.X;
float dy34 = p4.Y - p3.Y;
// Solve for t1 and t2
float denominator = (dy12 * dx34 - dx12 * dy34);
float t1 =
((p1.X - p3.X) * dy34 + (p3.Y - p1.Y) * dx34)
/ denominator;
if (float.IsInfinity(t1))
{
// The lines are parallel (or close enough to it).
lines_intersect = false;
segments_intersect = false;
intersection = new PointF(float.NaN, float.NaN);
close_p1 = new PointF(float.NaN, float.NaN);
close_p2 = new PointF(float.NaN, float.NaN);
return;
}
lines_intersect = true;
float t2 =
((p3.X - p1.X) * dy12 + (p1.Y - p3.Y) * dx12)
/ -denominator;
// Find the point of intersection.
double tempX = p1.X + dx12 * t1;
double tempY = p1.Y + dy12 * t1;
intersection = new PointF(Convert.ToSingle(Math.Round(tempX, 2)), Convert.ToSingle(Math.Round(tempY, 2)));
// The segments intersect if t1 and t2 are between 0 and 1.
segments_intersect =
((t1 >= 0) && (t1 <= 1) &&
(t2 >= 0) && (t2 <= 1));
// Find the closest points on the segments.
if (t1 < 0)
{
t1 = 0;
}
else if (t1 > 1)
{
t1 = 1;
}
if (t2 < 0)
{
t2 = 0;
}
else if (t2 > 1)
{
t2 = 1;
}
close_p1 = new PointF(p1.X + dx12 * t1, p1.Y + dy12 * t1);
close_p2 = new PointF(p3.X + dx34 * t2, p3.Y + dy34 * t2);
}
