/// <summary>
/// Draws the trail as a dotted line, fading away with age.
/// </summary>
public void Draw(IDraw drawer)
{
int index = currentIndex;
for (int j = 0; j < vertices.Length; j++)
{
// index of the next vertex (mod around ring buffer)
int next = (index + 1) % vertices.Length;
// "tick mark": every second, draw a segment in a different color
bool tick = ((flags[index] & 2) != 0 || (flags[next] & 2) != 0);
Color color = tick ? tickColor : trailColor;
// draw every other segment
if ((flags[index] & 1) != 0)
{
if (j == 0)
{
// draw segment from current position to first trail point
drawer.LineAlpha(currentPosition, vertices[index], color, 1);
}
else
{
// draw trail segments with opacity decreasing with age
const float minO = 0.05f; // minimum opacity
float fraction = (float)j / vertices.Length;
float opacity = (fraction * (1 - minO)) + minO;
drawer.LineAlpha(vertices[index], vertices[next], color, opacity);
}
}
index = next;
}
}
/// <summary>
/// Draws the trail as a dotted line, fading away with age.
/// </summary>
public void Draw(IDraw drawer)
{
int index = _currentIndex;
for (int j = 0; j < _vertices.Length; j++)
{
// index of the next vertex (mod around ring buffer)
int next = (index + 1) % _vertices.Length;
// "tick mark": every second, draw a segment in a different color
bool tick = ((_flags[index] & 2) != 0 || (_flags[next] & 2) != 0);
Color color = tick ? _tickColor : _trailColor;
// draw every other segment
if ((_flags[index] & 1) != 0)
{
if (j == 0)
{
// draw segment from current position to first trail point
drawer.LineAlpha(_currentPosition, _vertices[index], color, 1);
}
else
{
// draw trail segments with opacity decreasing with age
const float minO = 0.05f; // minimum opacity
float fraction = (float)j / _vertices.Length;
float opacity = (fraction * (1 - minO)) + minO;
drawer.LineAlpha(_vertices[index], _vertices[next], color, opacity);
}
}
index = next;
}
}