public void calcAngle(AsteroidPoint source)
{
this.angle = GetAngle(source);
if (source.x == this.x)
{
this.distance = Math.Abs(this.y - source.y);
}
else
{
this.distance = Math.Sqrt((Math.Pow((this.y - source.y) * 1.0, 2) + Math.Pow(this.x - source.x, 2)));
}
}
public double GetAngle(AsteroidPoint source)
{
// Get the angle from the source point to this one
// Need to convert to doubles before the slope calc
double dy = (this.y - source.y) * 1.0;
double dx = (this.x - source.x) * 1.0;
// Convert to degrees and offset so 0 degrees is up
// Swap the dy,dx parameters and rotate it
double atan = Math.Atan2(dy, dx) * (180 / Math.PI) + 180 + 270;
if (atan >= 360)
{
atan -= 360;
}
return(atan);
}
protected override string SolvePartTwo()
{
// Get the starting point from part 1
AsteroidPoint source = this.map.Where(t => t.x == 28 && t.y == 29).First();
// Remove from the list
//this.map.Remove(source);
// Set the angles
this.map.ForEach(b => b.calcAngle(source));
// List of angles to process
List <double> angles = this.map.Where(t => t.asteroid == 1).Select(t => t.angle).OrderBy(t => t).Distinct().ToList();
// We need to rotate through and figure out what to do with our lives
int vaporized = 0;
int maxVaporized = 200;
AsteroidPoint temp = null;
do
{
int i = 0;
do
{
// Is there a point to remove?
var t = this.map.Where(t => (t.x != source.x || t.y != source.y) && t.angle == angles[i] && t.asteroid == 1);
if (t.Count() > 0)
{
temp = t.OrderBy(d => d.distance).First();
temp.asteroid = 0;
vaporized++;
}
i++;
} while (i < angles.Count && vaporized < maxVaporized);
} while (vaporized < maxVaporized);
return($"Value: {((temp.x * 100) + temp.y).ToString("0000")}, x: {temp.x.ToString()}, y: {temp.y.ToString()}");
}
