public void NextBool()
{
for (int i = 0; i < __loops; i++)
{
_rng.NextBool();
}
}
public void NextBool()
{
int sampleCount = 10000000;
XorShiftRandom rng = new XorShiftRandom();
int trueCount = 0, falseCount = 0;
double maxExpectedCountErr = sampleCount / 25.0;
for (int i = 0; i < sampleCount; i++)
{
if (rng.NextBool())
{
trueCount++;
}
else
{
falseCount++;
}
}
double countErr = Math.Abs(trueCount - falseCount);
if (countErr > maxExpectedCountErr)
{
Assert.Fail();
}
}
private IntPoint[] GenerateRandomTestCase(int largeBoxRelativePos)
{
// Randomly select a position for the small box (the box is a single pixel in size).
IntPoint smallBoxPos = new IntPoint(_rng.Next(TestFieldResolution), _rng.Next(TestFieldResolution));
// Large box center is 5 pixels to the right, down or diagonally from the small box.
IntPoint largeBoxPos = smallBoxPos;
switch (largeBoxRelativePos)
{
case 0: // Right
largeBoxPos._x += 5;
break;
case 1: // Down
largeBoxPos._y += 5;
break;
case 2: // Diagonal
// Two alternate position get us to exactly 5 pixels distant from the small box.
if (_rng.NextBool())
{
largeBoxPos._x += 3;
largeBoxPos._y += 4;
}
else
{
largeBoxPos._x += 4;
largeBoxPos._y += 3;
}
break;
}
// Handle cases where the large box is outside the visual field or overlapping the edge.
if (largeBoxPos._x > CoordBoundIdx)
{ // Wrap around.
largeBoxPos._x -= TestFieldResolution;
if (0 == largeBoxPos._x)
{ // Move box fully into the visual field.
largeBoxPos._x++;
}
}
else if (CoordBoundIdx == largeBoxPos._x)
{ // Move box fully into the visual field.
largeBoxPos._x--;
}
else if (0 == largeBoxPos._x)
{ // Move box fully into the visual field.
largeBoxPos._x++;
}
if (largeBoxPos._y > CoordBoundIdx)
{ // Wrap around.
largeBoxPos._y -= TestFieldResolution;
if (0 == largeBoxPos._y)
{ // Move box fully into the visual field.
largeBoxPos._y++;
}
}
else if (CoordBoundIdx == largeBoxPos._y)
{ // Move box fully into the visual field.
largeBoxPos._y--;
}
else if (0 == largeBoxPos._y)
{ // Move box fully into the visual field.
largeBoxPos._y++;
}
return(new IntPoint[] { smallBoxPos, largeBoxPos });
}