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340 lines
8.1 KiB
C++
340 lines
8.1 KiB
C++
#include "stdafx.h"
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#include "topologicalanalysis.h"
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TopologicalAnalysis::TopologicalAnalysis(void)
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{
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}
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TopologicalAnalysis::~TopologicalAnalysis(void)
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{
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}
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bool TopologicalAnalysis::isPointInLine(double* point, double* startPoint, double* endPoint,float tolerance)
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{
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double AX = startPoint[0];
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double AY = startPoint[1];
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double BX = endPoint[0];
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double BY = endPoint[1];
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double PX = point[0];
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double PY = point[1];
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double dx_AB = AX - BX;
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double dy_AB = AY - BY;
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double dx_PA = PX - AX;
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double dy_PA = PY - AY;
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double dx_PB = PX - BX;
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double dy_PB = PY - BY;
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double AB = sqrt(dx_AB*dx_AB + dy_AB*dy_AB);
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double PA = sqrt(dx_PA*dx_PA + dy_PA*dy_PA);
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double PB = sqrt(dx_PB*dx_PB + dy_PB*dy_PB);
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double rate = abs(PA + PB - AB) / AB;
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if (rate < tolerance)
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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//判断线是否在折线上
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int TopologicalAnalysis::isPointInPolyLine(double* point, vector<double>& lineX,vector<double>& lineY,float tolerance)
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{
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int lineNum = lineX.size();
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double startPoint[2],endPoint[2];
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for (int i=0;i<lineNum-1;i++)
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{
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startPoint[0] = lineX.at(i);
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startPoint[1] = lineY.at(i);
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endPoint[0] = lineX.at(i+1);
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endPoint[1] = lineY.at(i+1);
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bool b_in = isPointInLine(point,startPoint,endPoint,tolerance);
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if(b_in)
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{
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return (i+1);
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}
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}
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//判断收尾点线段
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startPoint[0] = lineX.at(lineNum-1);
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startPoint[1] = lineY.at(lineNum-1);
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endPoint[0] = lineX.at(0);
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endPoint[1] = lineY.at(0);
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bool b_end = isPointInLine(point,startPoint,endPoint,tolerance);
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if (b_end)
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{
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return lineNum;
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}
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else
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{
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return 0;
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}
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}
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//根据两点求出垂线过第三点的直线的交点
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bool TopologicalAnalysis::GetPointToLineVerticalCross(double* linePt1,double* linePt2,double* pt,double* crossPt)
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{
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//垂直线
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if (linePt1[0] == linePt2[0])
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{
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crossPt[0] = linePt1[0];
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crossPt[1] = pt[1];
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return true;
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}
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//水平线
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if (linePt1[1] == linePt2[1])
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{
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crossPt[0] = pt[0];
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crossPt[1] = linePt1[1];
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return true;
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}
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float A = (linePt1[1]- linePt2[1]) * 1.0 / (linePt1[0]- linePt2[0]);
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float B = (linePt1[1] - A * linePt1[0]);
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float m = pt[0] + A * pt[1];
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/// 求两直线交点坐标
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crossPt[0] = (m - A * B) * 1.0f / (A * A + 1);
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crossPt[1] = A * crossPt[0] + B;
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return true;
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}
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//判断点是否在(简单)多边形内
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//polygon: 首尾相同的Cpoint1列表
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bool TopologicalAnalysis::isPointInPolygon(CPoint1 point, vector<CPoint1> polygon){
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if (polygon.size()<=3) return false; // 一个有效多边形顶点数应大于3
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int LineNum = polygon.size();
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CPoint1 leftP = point;
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CPoint1 rightP;
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rightP.SetX(getMaxX(polygon) + 1);
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rightP.SetY(point.GetY());
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int count = 0, yPrev = polygon[LineNum - 2].GetY();
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CPoint1 v1, v2;
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v1 = polygon[LineNum - 1];
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for (int i = 0; i < LineNum; i++)
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{
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v2 = polygon[i];
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if (isPointInLine(leftP, v1, v2))
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return true;
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if (v1.GetY() != v2.GetY())
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{
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if (isLineIntersect(v1, v2, leftP, rightP))
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{
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if (isPointInLine(v1, leftP, rightP))
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{
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if (v1.GetY()<v2.GetY()) { if (v1.GetY()>yPrev) count++; }
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else { if (v1.GetY() < yPrev) count++; }
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}
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else if (!isPointInLine(v2, leftP, rightP))
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{
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count++;
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}
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}
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}
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yPrev = v1.GetY();
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v1 = v2;
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}
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return (count % 2 == 1);
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}
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double TopologicalAnalysis::getMaxX(vector<CPoint1> points){
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if (points.size()==0)
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return -1;
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else if(points.size()==1)
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return points[0].GetX();
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else{
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double maxx = points[0].GetX();
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for (unsigned i=1; i<points.size();i++)
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{
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if(points[i].GetX()>maxx){
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maxx = points[i].GetX();
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}
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}
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return maxx;
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}
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}
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bool TopologicalAnalysis::isPointInLine(CPoint1 point, CPoint1 startPoint, CPoint1 endPoint)
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{
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long AX = startPoint.GetX();
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long AY = startPoint.GetY();
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long BX = endPoint.GetX();
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long BY = endPoint.GetY();
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long PX = point.GetX();
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long PY = point.GetY();
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double dx_AB = AX - BX;
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double dy_AB = AY - BY;
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double dx_PA = PX - AX;
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double dy_PA = PY - AY;
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double dx_PB = PX - BX;
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double dy_PB = PY - BY;
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double AB = sqrt(dx_AB*dx_AB + dy_AB*dy_AB);
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double PA = sqrt(dx_PA*dx_PA + dy_PA*dy_PA);
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double PB = sqrt(dx_PB*dx_PB + dy_PB*dy_PB);
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double rate = abs(PA + PB - AB) / AB;
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if (rate < 0.001)
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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// 叉积
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double mult(CPoint1 a, CPoint1 b, CPoint1 c)
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{
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return (a.GetX()-c.GetX())*(b.GetY()-c.GetY())-(b.GetX()-c.GetX())*(a.GetY()-c.GetY());
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}
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//判断两条直线段是否相交
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bool TopologicalAnalysis::isLineIntersect(CPoint1 line1Start, CPoint1 line1End, CPoint1 line2Start, CPoint1 line2End){
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double l1sx = line1Start.GetX();
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double l1sy = line1Start.GetY();
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double l1ex = line1End.GetX();
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double l1ey = line1End.GetY();
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double l2sx = line2Start.GetX();
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double l2sy = line2Start.GetY();
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double l2ex = line2End.GetX();
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double l2ey = line2End.GetY();
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if ( max(l1sx, l1ex)<min(l2sx, l2ex) )
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{
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return false;
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}
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if ( max(l1sy, l1ey)<min(l2sy,l2ey) )
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{
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return false;
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}
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if ( max(l2sx, l2ex)<min(l1sx, l1ex) )
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{
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return false;
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}
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if ( max(l2sy,l2ey)<min(l1sy, l1ey) )
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{
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return false;
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}
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if ( mult(line2Start, line1End, line1Start)*mult(line1End, line2End, line1Start)<0 )
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{
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return false;
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}
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if ( mult(line1Start, line2End, line2Start)*mult(line2End, line1End, line2Start)<0 )
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{
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return false;
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}
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return true;
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}
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bool TopologicalAnalysis::GetBoundingBoxVertices(const vector<double>& polygonX,const vector<double>& polygonY,vector<double>& rectangleX,vector<double>& rectangleY)
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{
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if (polygonX.size()<3 || polygonY.size()<3) return false;
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//计算最大最小x和y
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double minX = polygonX[0];
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double minY = polygonY[0];
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double maxX = polygonX[0];
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double maxY = polygonY[0];
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for (int i=0;i<polygonY.size();++i) {
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if (polygonX[i] < minX) minX = polygonX[i];
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if (polygonY[i] < minY) minY = polygonY[i];
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if (polygonX[i] > maxX) maxX = polygonX[i];
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if (polygonY[i] > maxY) maxY = polygonY[i];
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}
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rectangleX.push_back(minX);
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rectangleX.push_back(maxX);
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rectangleX.push_back(maxX);
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rectangleX.push_back(minX);
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rectangleY.push_back(maxY);
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rectangleY.push_back(maxY);
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rectangleY.push_back(minY);
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rectangleY.push_back(minY);
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}
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//计算直线与多边形的交点
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void TopologicalAnalysis::linePolygonIntersections(const Point2D& linePt1,const Point2D& linePt2,const vector<double>& polygonX,const vector<double>& polygonY, vector<Point2D>& result)
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{
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Line2D line1;
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line1.p1 = linePt1;
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line1.p2 = linePt2;
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Point2D intersectionPt;
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vector<Point2D> resPoints;
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for (int i=0;i<polygonX.size()-1;++i)
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{
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Point2D pt1,pt2;
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pt1.x = polygonX[i];
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pt1.y = polygonY[i];
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pt2.x = polygonX[i+1];
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pt2.y = polygonY[i+1];
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Line2D line2;
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line2.p1 = pt1;
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line2.p2 = pt2;
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int type = isLineIntersecting(line1,line2,intersectionPt);
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if (type == 1 || type == 2) //相交或重合
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{
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resPoints.push_back(intersectionPt);
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}
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}
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if (resPoints.size()>0)
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{
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//获取最左或者最右的两个点,忽略凹多边形中间交点
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double minX = resPoints[0].x;
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double maxX = resPoints[0].x;
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int minIndex = 0;
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int maxIndex = 0;
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for (int i=0;i<resPoints.size();++i) {
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if (resPoints[i].x < minX) minIndex = i;
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if (resPoints[i].x > maxX) maxIndex = i;
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}
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result.push_back(resPoints[minIndex]);
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result.push_back(resPoints[maxIndex]);
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}
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}
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// 判断两条线段是否相交
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int TopologicalAnalysis::isLineIntersecting(const Line2D& l1, const Line2D& l2, Point2D& intersection) {
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float numera = (l2.p2.x-l2.p1.x) * (l1.p1.y-l2.p1.y) - (l2.p2.y-l2.p1.y) * (l1.p1.x-l2.p1.x);
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float numerb = (l1.p2.x-l1.p1.x) * (l1.p1.y-l2.p1.y) - (l1.p2.y-l1.p1.y) * (l1.p1.x-l2.p1.x);
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float denom = (l2.p2.y-l2.p1.y) * (l1.p2.x-l1.p1.x) - (l2.p2.x-l2.p1.x) * (l1.p2.y-l1.p1.y);
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if(denom == 0.0f)
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{
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if(numera == 0.0f && numerb == 0.0f)
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{
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intersection.x = l2.p2.x;
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intersection.y = l2.p2.y;
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return 2; //重合
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}
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return 3; //平行
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}
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float ua = numera / denom;
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float ub = numerb / denom;
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if(ua >= 0.0f && ua <= 1.0f && ub >= 0.0f && ub <= 1.0f)
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{
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intersection.x = l1.p1.x + ua*(l1.p2.x - l1.p1.x);
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intersection.y = l1.p1.y + ua*(l1.p2.y - l1.p1.y);
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return 1; //相交
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}
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return 0; //不相交
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}
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