//----------------------------------------------------------------
public void Begin(double x, double y, int len)
{
// Calculate transformed coordinates at x1,y1
double xt = x;
double yt = y;
_trans_dir.Transform(ref xt, ref yt);
int x1 = AggMath.iround(xt * SUBPIXEL_SCALE);
int y1 = AggMath.iround(yt * SUBPIXEL_SCALE);
double dx;
double dy;
double delta = 1 / (double)SUBPIXEL_SCALE;
// Calculate scale by X at x1,y1
dx = xt + delta;
dy = yt;
_trans_inv.Transform(ref dx, ref dy);
dx -= x;
dy -= y;
int sx1 = (int)AggMath.uround(SUBPIXEL_SCALE / Math.Sqrt(dx * dx + dy * dy)) >> SUBPIXEL_SHIFT;
// Calculate scale by Y at x1,y1
dx = xt;
dy = yt + delta;
_trans_inv.Transform(ref dx, ref dy);
dx -= x;
dy -= y;
int sy1 = (int)AggMath.uround(SUBPIXEL_SCALE / Math.Sqrt(dx * dx + dy * dy)) >> SUBPIXEL_SHIFT;
// Calculate transformed coordinates at x2,y2
x += len;
xt = x;
yt = y;
_trans_dir.Transform(ref xt, ref yt);
int x2 = AggMath.iround(xt * SUBPIXEL_SCALE);
int y2 = AggMath.iround(yt * SUBPIXEL_SCALE);
// Calculate scale by X at x2,y2
dx = xt + delta;
dy = yt;
_trans_inv.Transform(ref dx, ref dy);
dx -= x;
dy -= y;
int sx2 = (int)AggMath.uround(SUBPIXEL_SCALE / Math.Sqrt(dx * dx + dy * dy)) >> SUBPIXEL_SHIFT;
// Calculate scale by Y at x2,y2
dx = xt;
dy = yt + delta;
_trans_inv.Transform(ref dx, ref dy);
dx -= x;
dy -= y;
int sy2 = (int)AggMath.uround(SUBPIXEL_SCALE / Math.Sqrt(dx * dx + dy * dy)) >> SUBPIXEL_SHIFT;
// Initialize the interpolators
_coord_x = new LineInterpolatorDDA2(x1, x2, len);
_coord_y = new LineInterpolatorDDA2(y1, y2, len);
_scale_x = new LineInterpolatorDDA2(sx1, sx2, len);
_scale_y = new LineInterpolatorDDA2(sy1, sy2, len);
}
public static VertexStore TransformToVxs(this Perspective perspecitveTx, VertexStoreSnap snap, VertexStore vxs)
{
var vsnapIter = snap.GetVertexSnapIter();
double x, y;
VertexCmd cmd;
do
{
cmd = vsnapIter.GetNextVertex(out x, out y);
perspecitveTx.Transform(ref x, ref y);
vxs.AddVertex(x, y, cmd);
} while (!VertexHelper.IsEmpty(cmd));
return(vxs);
}
public static VertexStore TransformToVxs(this Perspective perspecitveTx, VertexStore src, VertexStore vxs)
{
VertexCmd cmd;
double x, y;
int count = src.Count;
for (int i = 0; i < count; ++i)
{
cmd = src.GetVertex(i, out x, out y);
perspecitveTx.Transform(ref x, ref y);
vxs.AddVertex(x, y, cmd);
}
return(vxs);
}
