Struct PolylineSegmentHiLoGpu

Namespace

LansMap.Lines

Assembly

LansMap.Runtime.dll

public struct PolylineSegmentHiLoGpu

Inherited Members

ValueType.Equals(object)

ValueType.GetHashCode()

ValueType.ToString()

Fields

AHi

Coarse half of endpoint A's absolute mercator position, snapped to the PositionGrid lattice.

public Vector2 AHi

Field Value

Vector2

ALo

Fine remainder of endpoint A's absolute mercator position; magnitude below one lattice step.

public Vector2 ALo

Field Value

Vector2

AltA

Endpoint A's height above the ground in normalized mercator units.

public float AltA

Field Value

float

AltB

Endpoint B's height above the ground in normalized mercator units.

public float AltB

Field Value

float

BHi

Coarse half of endpoint B's absolute mercator position, on the same lattice as AHi.

public Vector2 BHi

Field Value

Vector2

BLo

Fine remainder of endpoint B's absolute mercator position; magnitude below one lattice step.

public Vector2 BLo

Field Value

Vector2

ColorRgba

Line color, RGBA one byte per channel, red in the high byte.

public uint ColorRgba

Field Value

uint

CornerRadiusRatio

Corner radius of the joins and caps as a fraction of the half width, 0 (miter, butt) to 1 (round).

public float CornerRadiusRatio

Field Value

float

DashPeriod

Positive is screen px, or render-texture px on the world path; negative is normalized mercator; 0 draws solid.

public float DashPeriod

Field Value

float

DistMercA

Chain-unwrapped mercator path length from the line's first vertex to endpoint A, narrowed from the store's double. Screen px per mercator unit at zoom 16 is about 16.7 million, so a world- circling trail carries about 1 px of phase error here - invisible; a 100 km line carries about 0.003 px. A set sign bit marks a flat segment (PackedDistMercA); read it with a bit test, not a sign comparison, since the first segment of a flat line packs as negative zero.

public float DistMercA

Field Value

float

Flags

Reserved flag word, zero today and read by nothing; keeps the stride 8-aligned until a future field needs real bits here.

public uint Flags

Field Value

uint

NextSlotOffset

Slot offset of the segment that starts at this segment's B, relative to this slot; 0 when B ends the line (a cap).

public int NextSlotOffset

Field Value

int

PrevSlotOffset

Slot offset of the segment that ends at this segment's A, relative to this slot; 0 when A starts the line (a cap).

public int PrevSlotOffset

Field Value

int

Stride

Byte size of one segment, the stride of the buffer the polyline shader reads.

public const int Stride = 72

Field Value

int

WidthPx

Line width in screen px (flat draw) or render-texture px (world draw); negative marks a screen-dashed line whose dash ignores pitch; 0 hides the segment.

public float WidthPx

Field Value

float

Methods

SetEndpoints(double, double, double, double)

Fills both endpoints from absolute normalized mercator coordinates, splitting all four on the shared HiLoLattice.

public void SetEndpoints(double ax, double ay, double bx, double by)

Parameters

ax double

Endpoint A's absolute mercator X.

ay double

Endpoint A's absolute mercator Y.

bx double

Endpoint B's absolute mercator X.

by double

Endpoint B's absolute mercator Y.

Remarks

Deliberately takes the store's raw doubles and does no folding and no anchor subtraction. Baking either one here is exactly what made every stored position stale the moment the view moved.