71 lines
2.4 KiB
C#
71 lines
2.4 KiB
C#
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using UnityEngine;
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using System.Collections;
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using System.Collections.Generic;
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namespace TGS.Geom {
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class SweepEvent {
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public Point p;
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public bool isLeft; // Is the point the left endpoint of the segment (p, other->p)?
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public PolygonType polygonType; // PolygonType to which this event belongs to: either PolygonClipper.SUBJECT, or PolygonClipper.CLIPPING
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public SweepEvent otherSE; // Event associated to the other endpoint of the segment
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public Segment _segment;
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/* Does the segment (p, other->p) represent an inside-outside transition
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* in the polygon for a vertical ray from (p.x, -infinite) that crosses the segment?
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*/
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public bool inOut;
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public EdgeType edgeType; // The EdgeType. @see EdgeType.as
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public bool inside; // Only used in "left" events. Is the segment (p, other->p) inside the other polygon?
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public SweepEvent(Point p, bool isLeft, PolygonType polygonType): this(p,isLeft,polygonType,null, EdgeType.NORMAL) {
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}
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public SweepEvent(Point p, bool isLeft, PolygonType polygonType, SweepEvent otherSweepEvent): this(p,isLeft,polygonType,otherSweepEvent, EdgeType.NORMAL) {
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}
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public SweepEvent(Point p, bool isLeft, PolygonType polygonType, SweepEvent otherSweepEvent, EdgeType edgeType) {
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this.p = p;
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this.isLeft = isLeft;
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this.polygonType = polygonType;
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this.otherSE = otherSweepEvent;
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this.edgeType = edgeType;
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}
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public Segment segment {
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get {
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if (_segment==null) {
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_segment = new Segment(p, otherSE.p);
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}
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return _segment;
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}
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}
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double signedArea(Point p0, Point p1, Point p2) {
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return (p0.x - p2.x) * (p1.y - p2.y) - (p1.x - p2.x) * (p0.y - p2.y);
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}
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// Checks if this sweep event is below point p.
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public bool isBelow(Point x) {
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return (isLeft) ? (signedArea(p, otherSE.p, x) > 0) : (signedArea(otherSE.p, p, x) > 0);
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}
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public bool isAbove(Point x) {
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return !isBelow(x);
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}
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public bool Equals(SweepEvent e2) {
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bool equal = isLeft == e2.isLeft && polygonType == e2.polygonType && inOut == e2.inOut && edgeType == e2.edgeType && inside == e2.inside && Point.EqualsBoth(p, e2.p);
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if (!equal) return false;
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return otherSE.isLeft == e2.otherSE.isLeft && otherSE.polygonType == e2.otherSE.polygonType &&
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otherSE.inOut == e2.otherSE.inOut && otherSE.edgeType == e2.otherSE.edgeType && otherSE.inside == e2.otherSE.inside && Point.EqualsBoth(otherSE.p, e2.otherSE.p);
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}
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}
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}
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