private void MoveCamera(DrawContext dc, Vector2 prev, Vector2 current)
{
Vector3d pv = new Vector3d(prev.X, prev.Y, 0);
Vector3d cv = new Vector3d(current.X, current.Y, 0);
Vector3d dv = cv - pv;
dv.X *= -1.0;
dc.WorldVectorToDevVector(dv);
Vector3d lookAt = dc.LookAt + dv;
Vector3d eye = dc.Eye + dv;
dc.SetCamera(eye, lookAt, dc.UpVector);
}
/**
* 画面上での間隔が min より大きくなるように間引く為のサイズの
* 倍率を求める
*/
public double Decimate(DrawContext dc, Gridding grid, double min)
{
double scaleX = 1.0;
double scaleY = 1.0;
double scaleZ = 1.0;
double gridSizeX = grid.GridSize.X;
double gridSizeY = grid.GridSize.Y;
double gridSizeZ = grid.GridSize.Z;
Vector3d devLen;
double t = 1;
double d;
double devLenX;
double devLenY;
double devLenZ;
// X axis
devLen = dc.WorldVectorToDevVector(new Vector3d(gridSizeX, 0, 0));
devLenX = Math.Max(Math.Abs(devLen.X), Math.Abs(devLen.Y));
if (devLenX != 0 && devLenX < min)
{
d = Math.Ceiling(min / devLenX) * devLenX;
t = d / devLenX;
}
if (t > scaleX)
{
scaleX = t;
}
// Y axis
devLen = dc.WorldVectorToDevVector(new Vector3d(0, gridSizeY, 0));
devLenY = Math.Max(Math.Abs(devLen.X), Math.Abs(devLen.Y));
if (devLenY != 0 && devLenY < min)
{
d = Math.Ceiling(min / devLenY) * devLenY;
t = d / devLenY;
}
if (t > scaleY)
{
scaleY = t;
}
// Z axis
devLen = dc.WorldVectorToDevVector(new Vector3d(0, 0, gridSizeZ));
devLenZ = Math.Max(Math.Abs(devLen.X), Math.Abs(devLen.Y));
if (devLenZ != 0 && devLenZ < min)
{
d = Math.Ceiling(min / devLenZ) * devLenZ;
t = d / devLenZ;
}
if (t > scaleZ)
{
scaleZ = t;
}
return(Math.Max(Math.Max(scaleX, scaleY), scaleZ));
}