/********************************************************** * To check the Pt is in the Triangle or not. * If the Pt is in the line or is a vertex, then return true. * If the Pt is out of the Triangle, then return false. * * This method is used for triangle only. ***********************************************************/ private bool TriangleContainsPoint(CPoint2D[] trianglePts, CPoint2D pt) { if (trianglePts.Length != 3) { return(false); } for (int i = trianglePts.GetLowerBound(0); i < trianglePts.GetUpperBound(0); i++) { if (pt.EqualsPoint(trianglePts[i])) { return(true); } } bool bIn = false; CLineSegment line0 = new CLineSegment(trianglePts[0], trianglePts[1]); CLineSegment line1 = new CLineSegment(trianglePts[1], trianglePts[2]); CLineSegment line2 = new CLineSegment(trianglePts[2], trianglePts[0]); if (pt.InLine(line0) || pt.InLine(line1) || pt.InLine(line2)) { bIn = true; } else //point is not in the lines { double dblArea0 = CPolygon.PolygonArea(new CPoint2D[] { trianglePts[0], trianglePts[1], pt }); double dblArea1 = CPolygon.PolygonArea(new CPoint2D[] { trianglePts[1], trianglePts[2], pt }); double dblArea2 = CPolygon.PolygonArea(new CPoint2D[] { trianglePts[2], trianglePts[0], pt }); if (dblArea0 > 0) { if ((dblArea1 > 0) && (dblArea2 > 0)) { bIn = true; } } else if (dblArea0 < 0) { if ((dblArea1 < 0) && (dblArea2 < 0)) { bIn = true; } } } return(bIn); }
/***Check whether this line is in a longer line***/ public bool InLine(CLineSegment longerLineSegment) { bool bInLine = false; if ((m_startPoint.InLine(longerLineSegment)) && (m_endPoint.InLine(longerLineSegment))) { bInLine = true; } return(bInLine); }