StrokeCountMap Class

data carrier interface for per-primitive stroke counts and distances used by PolyfaceBuilder.

  • For a simple primitive (Line segment or arc) that is stroked with uniform fraction, the members are:

    • numStroke = total number of strokes
    • curveLength = length of this curve
    • a0 = external mapped coordinate for fraction 0 on this primitive or component
    • a1 = external mapped coordinate for fraction 1 on this primitive or component
  • For linestring and bspline curve, those numbers are totals for the overall curve, and breakdown within the components (line segments or bezier spans) is recoreded on the optional array componentData[]

    • Members of the array are annotated with componentIndex within the linestring or bspline curve

Methods

Name Description
addToCountAndLength(numStroke: number, curveLength: number): void Apply stroke count and curve length from a component to a parent map.  
clone(): StrokeCountMap * clone all data from root.  
fractionToA(fraction: number): number interpolate in the a0,a1 mapping.  
isCompatibleComponentStructure(other: StrokeCountMap, enforceCounts: boolean): boolean return true if other has the same component structure as this
* testing recursives through corresponding members of cmomponentData arrays.
 
createWithComponentIndex(componentIndex: number = 0, numStroke: number = 0, curveLength: number = 0, a0: number = 0, a1: number = 0): StrokeCountMap Static Create a StrokeCountMap with componentIndex (but no primitive or componentData array)  
createWithCurvePrimitive(primitive: CurvePrimitive, numStroke: number, curveLength: number, a0: number, a1: number, componentData?: StrokeCountMap[]): StrokeCountMap Static Create a StrokeCountMap with curve primitive and optional compontnData array.  
createWithCurvePrimitiveAndOptionalParent(curvePrimitive: CurvePrimitive, parentMap?: StrokeCountMap, componentData?: StrokeCountMap[]): StrokeCountMap Static create a StrokeCountMap, optionally
(a) use parent a1 as new a0
(b) attach a (usually empty) array for component counts.
 

Properties

Name Type Description
a0 number start coordinate (in user-defined space) for fraction 0 on this primitive or component  
a1 number end coordinate (in user-defined space) for fraction 0 on this primitive or component  
componentData undefined | StrokeCountMap[] further StrokeCountMap's within this interval (e.g.  
componentIndex undefined | number this curve's index within its parent.  
curveLength number Length of the curve interval.  
numStroke number number of strokes expected in this interval.  
primitive undefined | CurvePrimitive The curve that this map represents  

Defined in

Last Updated: 20 September, 2019