public void Tan(double value, AngularUnit unit, double expected)
{
var v = new Measurement <AngularUnit>(value, unit);
MeasurementMath.Tan(v).Should().BeApproximately(expected, 1e-10);
MeasurementMath.Atan(expected).In(unit).Should().BeApproximately(value, 1e-7);
}
public TrajectoryPoint(TimeSpan time, Measurement <DistanceUnit> distance,
Measurement <VelocityUnit> velocity, double mach, Measurement <DistanceUnit> drop,
Measurement <DistanceUnit> windage, Measurement <EnergyUnit> energy,
Measurement <WeightUnit> optimalGameWeight)
{
Time = time;
Distance = distance;
Velocity = velocity;
Drop = drop;
DropAdjustment = MeasurementMath.Atan(Drop / Distance);
Mach = mach;
Windage = windage;
WindageAdjustment = MeasurementMath.Atan(Windage / Distance);
Energy = energy;
OptimalGameWeight = optimalGameWeight;
}
/// <summary>
/// <para>Draws a square target on the specified canvas</para>
/// <para>Use this method before drawing the reticle</para>
/// </summary>
/// <param name="trajectory">The trajectory to get the BDC parameters</param>
/// <param name="targetSize">The size of a side of a rectangular target</param>
/// <param name="targetDistance">The distance to the target</param>
/// <param name="color">The color of the target</param>
public void DrawTarget(IEnumerable <TrajectoryPoint> trajectory,
Measurement <DistanceUnit> targetSize, Measurement <DistanceUnit> targetDistance,
string color)
{
var angularTargetSize = MeasurementMath.Atan(targetSize / targetDistance);
var trajectoryPoint = FindByDistance(trajectory, targetDistance);
if (trajectoryPoint != null)
{
var centerY = trajectoryPoint.DropAdjustment;
var centerX = trajectoryPoint.WindageAdjustment;
var x0 = centerX - angularTargetSize / 2;
var y0 = centerY + angularTargetSize / 2;
DrawElement(new ReticleRectangle()
{
TopLeft = new ReticlePosition(x0, y0),
Size = new ReticlePosition(angularTargetSize, angularTargetSize),
Fill = false,
Color = color,
});
}
}