LFLineSegment.cpp

00001 /*
00002 Copyright 2010, Ming-Yu Liu
00003 
00004 All Rights Reserved 
00005 
00006 Permission to use, copy, modify, and distribute this software and 
00007 its documentation for any non-commercial purpose is hereby granted 
00008 without fee, provided that the above copyright notice appear in 
00009 all copies and that both that copyright notice and this permission 
00010 notice appear in supporting documentation, and that the name of 
00011 the author not be used in advertising or publicity pertaining to 
00012 distribution of the software without specific, written prior 
00013 permission. 
00014 
00015 THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, 
00016 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
00017 ANY PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 
00018 ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 
00019 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 
00020 AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 
00021 OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 
00022 */
00023 
00024 
00025 
00026 #include "LFLineSegment.h"
00027 
00028 void LFLineSegment::Read(FILE* fin)
00029 {
00030   int ret=0;
00031         ret=fscanf(fin, "%lf %lf", &sx_, &sy_);
00032         ret=fscanf(fin, "%lf %lf", &ex_, &ey_);
00033 }
00034 
00035 double LFLineSegment::Theta()
00036 {
00037         double theta = atan2(ey_-sy_,ex_-sx_);
00038         if (theta<0)
00039                 theta += M_PI;
00040         return theta;
00041 }
00042 
00043 void LFLineSegment::Center(double *center)
00044 {
00045         center[0] = (sx_ + ex_) / 2;
00046         center[1] = (sy_ + ey_) / 2;
00047 }
00048 
00049 void LFLineSegment::Translate(double *vec)
00050 {
00051         sx_ += vec[0];
00052         sy_ += vec[1];
00053 
00054         ex_ += vec[0];
00055         ey_ += vec[1];
00056 }
00057 
00058 
00059 void LFLineSegment::Rotate(double theta)
00060 {
00061         double x, y;
00062         x = sx_, y = sy_;
00063 
00064         double sinTheta;
00065         double cosTheta;
00066         double mat[2][2];
00067 
00068         sinTheta = sin(theta);
00069         cosTheta = cos(theta);
00070         mat[0][0] = cosTheta;
00071         mat[0][1] = -sinTheta;
00072         mat[1][0] = sinTheta;
00073         mat[1][1] = cosTheta;
00074 
00075         sx_ = x*mat[0][0] + y*mat[0][1];
00076         sy_ = x*mat[1][0] + y*mat[1][1];
00077 
00078         x = ex_, y = ey_;
00079         ex_ = x*mat[0][0] + y*mat[0][1];
00080         ey_ = x*mat[1][0] + y*mat[1][1];
00081 }
00082 
00083 void LFLineSegment::Scale(double s)
00084 {
00085         sx_ *= s;
00086         sy_ *= s;
00087         ex_ *= s;
00088         ey_ *= s;
00089 
00090 }
00091 
00092 double LFLineSegment::Length()
00093 {
00094         double x, y;
00095         x = ex_ - sx_;
00096         y = ey_ - sy_;
00097 
00098         return sqrt(x*x+y*y);
00099 }
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