protected Vector2d CalculateOffset(int frame)
{
var box = CameraBoundingBox.Create(Vector2d.Zero, _zoom);
if (_prevframe != -1 &&
_prevframe <= frame &&
(frame - _prevframe) <= 1)
{
if (frame == _prevframe)
{
return(_prevcamera);
}
if (frame % cacherate != 0)
{
return(box.Clamp(StepCamera(box, ref _prevcamera, frame)));
}
}
int cachepos = Math.Min(frame / cacherate, _framecache.Count - 1);
int framestart = cachepos * cacherate;
Vector2d start = _framecache[cachepos];
for (int i = framestart; i <= frame; i++)
{
if (i % cacherate == 0 && i / cacherate == _framecache.Count)
{
_framecache.Add(start);
}
start = StepCamera(box, ref start, i);
}
// Debug.WriteLine("Calculating " + framestart + "-" + (frame) + " for legacy camera");
return(box.Clamp(start));
}
/// <summary>
/// reduces the amount of movement the camera has to do to capture the
/// rider. It does so predictively
/// </summary>
/// <returns>The reduced position in game coords</returns>
private Vector2d CameraMotionReducer(int frame)
{
const int forwardcount = 40;
EnsureFrame(frame + forwardcount);
Vector2d offset = CalculateOffset(frame);
var box = CameraBoundingBox.Create(Vector2d.Zero, _zoom);
var framebox = CameraBoundingBox.Create(
_frames[frame].RiderCenter,
_zoom);
Vector2d center = Vector2d.Zero;
int math = 0;
for (int i = 0; i < forwardcount; i++)
{
var f = _frames[frame + i];
offset = box.Clamp(offset + f.CameraOffset);
center += framebox.Clamp(f.RiderCenter + offset);
math++;
}
// force the rider to center at the beginning
// it looks awkward to predict heavily at the start.
if (frame < forwardcount)
{
return(Vector2d.Lerp(
_frames[frame].RiderCenter,
center / math,
frame / (float)forwardcount));
}
return(center / math);
}
protected override Vector2d StepCamera(CameraBoundingBox box, ref Vector2d prev, int frame)
{
const double push = 0.8;
const double pull = 0.01;
CameraEntry entry = _frames[frame];
var ret = box.Clamp(prev + entry.CameraOffset);
Angle a = Angle.FromVector(ret);
double length = ret.Length;
double prevlength = prev.Length;
var edge = a.MovePoint(
Vector2d.Zero,
Math.Max(box.Bounds.Width, box.Bounds.Height));
double maxlength = box.Clamp(edge).Length;
double lengthratio = length / maxlength;
double prevratio = prevlength / maxlength;
double diffratio = Math.Abs(lengthratio - prevratio);
if (length > prevlength)
{
var dr = lengthratio - prevratio;
var damper = lengthratio - (dr / 2);
var delta = length - prevlength;
delta *= Math.Max(0.05, push * (1 - Math.Max(0, damper)));
length = prevlength + delta;
}
length -= length * pull;
return(box.Clamp(a.MovePoint(Vector2d.Zero, length)));
}
public override Vector2d GetFrameCamera(int frame)
{
base.GetFrameCamera(frame);
var box = CameraBoundingBox.Create(_frames[frame].RiderCenter, _zoom);
return(box.Clamp(CameraMotionReducer(frame)));
}
private Vector2d Calculate(int frame)
{
if (_cacheframe != -1 &&
_cacheframe <= frame &&
(frame - _cacheframe) < 80)
{
return(ClampFrames(
_cacheframe,
(frame - _cacheframe),
_cachepos));
}
Vector2d framecenter = _frames[frame].RiderCenter;
var box = new CameraBoundingBox(framecenter);
if (Settings.RoundLegacyCamera)
{
box.SetupSmooth(_frames[frame].ppf, _zoom);
}
else
{
box.SetupLegacy(_zoom);
}
var framebounds = box.Bounds;
int calcstart = 0;
var ret = framecenter;
var xfound = false;
var yfound = false;
for (int i = frame; i >= 0; i--)
{
var current = _frames[i].RiderCenter;
var cmp = framecenter - current;
// todo, i have no idea why this works.
// seriously, ive tried so much stuff, but for the ellipse
// camera i can't seem to make it work any better than with
// width or height * 2
if (Math.Abs(cmp.X) >= framebounds.Width * 2)
{
xfound = true;
}
if (Math.Abs(cmp.Y) >= framebounds.Height * 2)
{
yfound = true;
}
if (xfound && yfound)
{
calcstart = i;
break;
}
}
var calccount = (frame - calcstart);
return(ClampFrames(calcstart, calccount, _frames[calcstart].RiderCenter));
}
public static CameraBoundingBox Create(Vector2d center, float zoom)
{
CameraBoundingBox box = new CameraBoundingBox(new Vector2d(center.X, center.Y));
if (Settings.RoundLegacyCamera || Settings.SmoothCamera)
{
box.SetupSmooth(0, zoom);
}
else
{
box.SetupLegacy(zoom);
}
return(box);
}
private Vector2d Clamp(Vector2d pos, Vector2d center, double ppf)
{
CameraBoundingBox box = new CameraBoundingBox(center);
if (Settings.SmoothCamera)
{
box.SetupSmooth(ppf, _zoom);
}
else
{
box.SetupLegacy(_zoom);
}
return(box.Clamp(pos));
}
private Vector2d Clamp(Vector2d pos, int frame)
{
var entry = _frames[frame];
CameraBoundingBox box = new CameraBoundingBox(entry.RiderCenter);
if (Settings.RoundLegacyCamera)
{
box.SetupSmooth(entry.ppf, _zoom);
}
else
{
box.SetupLegacy(_zoom);
}
return(box.Clamp(pos));
}
public DoubleRect getclamp(float zoom, int width, int height)
{
var ret = GetViewport(zoom, width, height);
var pos = ret.Vector + (ret.Size / 2);
var b = new CameraBoundingBox(pos);
if (Settings.SmoothCamera || Settings.RoundLegacyCamera)
{
b.SetupSmooth(GetPPF(_currentframe), _zoom);
return(b.Bounds);
}
else
{
b.SetupLegacy(_zoom);
return(b.Bounds);
}
}
public DoubleRect getclamp(float zoom, int width, int height, Vector2d offset)
{
offset.Y = -offset.Y; //Flip Y value so it's up, not down
var ret = GetViewport(zoom, width, height, offset);
var pos = ret.Vector + (ret.Size / 2);
var b = new CameraBoundingBox(pos);
if (Settings.SmoothCamera || Settings.RoundLegacyCamera)
{
b.SetupSmooth(GetPPF(_currentframe), _zoom);
return(b.Bounds);
}
else
{
b.SetupLegacy(_zoom);
return(b.Bounds);
}
}
protected abstract Vector2d StepCamera(CameraBoundingBox box, ref Vector2d prev, int frame);
protected override Vector2d StepCamera(CameraBoundingBox box, ref Vector2d prev, int frame)
{
var entry = _frames[frame];
return(box.Clamp(prev + entry.CameraOffset));
}