public static TSVector2 Gradient(this SDFMap map, List <SDFShape> sharpes, List <DynamicCircle> circles, TSVector2 pos)
{
FP delat = FP.ONE;
FP x = map.Sample(new TSVector2(pos.x + delat, pos.y), sharpes, circles) - map.Sample(new TSVector2(pos.x - delat, pos.y), sharpes, circles);
FP y = map.Sample(new TSVector2(pos.x, pos.y + delat), sharpes, circles) - map.Sample(new TSVector2(pos.x, pos.y - delat), sharpes, circles);
return(new TSVector2(FP.Half * x, FP.Half * y));
}
public static TSVector2 Move(this SDFMap map, List <DynamicCircle> circles, FP radius, TSVector2 start, TSVector2 dir, FP len, int layerMask = -1)
{
start = map.SDF.WorldToLocal(start);
TSVector2 end = start + dir * len;
RectInt rect = map.SDF.ToRect(start, end);
int externSize = (int)TSMath.Ceiling(radius / map.SDF.Grain);
rect.max += new Vector2Int(externSize, externSize);
moveFilterCache.Clear();
map.FilterToList(moveFilterCache, rect, layerMask);
FP maxStepLen = radius * FP.Half;
int moveStep = (int)TSMath.Ceiling(len / maxStepLen);
TSVector2 result = start;
for (int i = 1; i <= moveStep; ++i)
{
FP moveLen = maxStepLen;
if (i == moveStep)
{
moveLen = len - (moveStep - 1) * maxStepLen;
}
TSVector2 newPos = result + dir * moveLen;
FP sd = map.Sample(newPos, moveFilterCache, circles);
if (sd < radius)
{
TSVector2 gradient = map.Gradient(moveFilterCache, circles, newPos);
TSVector2 asjustDir = dir - gradient * TSVector2.Dot(gradient, dir);
newPos = result + asjustDir.normalized * moveLen;
//多次迭代
for (int j = 0; j < 3; ++j)
{
sd = map.Sample(newPos, moveFilterCache, circles);
if (sd >= radius)
{
break;
}
newPos += map.Gradient(moveFilterCache, circles, newPos) * (radius - sd);
}
//避免往返
if (TSVector2.Dot(newPos - start, dir) < FP.Zero)
{
return(result + map.SDF.Origin);
}
else
{
result = newPos;
}
break;
}
else
{
result = newPos;
}
}
return(result + map.SDF.Origin);
}
//直线移动，用于AI的移动
public static TSVector2 StraightMove(this SDFMap map, List <DynamicCircle> circles, FP radius, TSVector2 start, TSVector2 dir, FP len, int layerMask = -1)
{
start = map.SDF.WorldToLocal(start);
TSVector2 end = start + dir * len;
RectInt rect = map.SDF.ToRect(start, end);
int externSize = (int)TSMath.Ceiling(radius / map.SDF.Grain);
rect.max += new Vector2Int(externSize, externSize);
moveFilterCache.Clear();
map.FilterToList(moveFilterCache, rect, layerMask);
FP maxStepLen = radius * FP.Half;
int moveStep = (int)TSMath.Ceiling(len / maxStepLen);
TSVector2 result = start;
for (int i = 1; i <= moveStep; ++i)
{
FP moveLen = maxStepLen;
if (i == moveStep)
{
moveLen = len - (moveStep - 1) * maxStepLen;
}
TSVector2 newPos = result + dir * moveLen;
FP sd = map.Sample(newPos, moveFilterCache, circles);
if (sd < radius)
{
newPos = result + dir * sd;
sd = map.Sample(newPos, moveFilterCache, circles);
if (sd >= radius)
{
result = newPos;
}
break;
}
result = newPos;
}
return(result + map.SDF.Origin);
}
public static TSVector2 DiskCast(this SDFMap map, TSVector2 origin, TSVector2 dir, FP radius, FP maxDistance, List <SDFShape> sharpes, List <DynamicCircle> circles)
{
FP t = FP.Zero;
while (true)
{
TSVector2 p = origin + dir * t;
FP sd = map.Sample(p, sharpes, circles);
if (sd <= radius)
{
return(p);
}
t += (sd - radius);
if (t >= maxDistance)
{
return(origin + dir * maxDistance);
}
}
}
