| // |
// |
| // |
|
| // |
|
| // $B:BI87O$,2hLL:BI87O(B($B:8>e$,(B(0,0))$B$G$"$k$3$H$KCm0U$9$k(B |
// $B:BI87O$,2hLL:BI87O(B($B:8>e$,(B(0,0))$B$G$"$k$3$H$KCm0U$9$k(B |
| // |
// |
| |
// (0,-1) |
| |
// (-1,0) (0,0) (1,0) |
| |
// (0,1) |
| public final class Point { |
public final class Point { |
| double x,y; |
double x,y; |
| // 10^-5$B0J2<$O(B0$B$H8+$J$9!%(B |
// 10^-5$B0J2<$O(B0$B$H8+$J$9!%(B |
| public Point minus(Point p){ |
public Point minus(Point p){ |
| return new Point(x-p.getX(),y-p.getY()); |
return new Point(x-p.getX(),y-p.getY()); |
| } |
} |
| |
public Point neg(){ |
| |
return new Point(-x,-y); |
| |
} |
| public Point times(double r){ |
public Point times(double r){ |
| return new Point(x*r,y*r); |
return new Point(x*r,y*r); |
| } |
} |
| |
public Point timesX(double r){ |
| |
return new Point(x*r,y); |
| |
} |
| |
public Point timesY(double r){ |
| |
return new Point(x,y*r); |
| |
} |
| // $B%Y%/%?!<$ND9$5$r(B newLength$B$K@55,2=$9$k!%(B |
// $B%Y%/%?!<$ND9$5$r(B newLength$B$K@55,2=$9$k!%(B |
| public Point normal(double newLength){ |
public Point normal(double newLength){ |
| double ratio=newLength/length(); |
double ratio=newLength/length(); |
| public Point rot270(){ |
public Point rot270(){ |
| return new Point(-y,x); |
return new Point(-y,x); |
| } |
} |
| |
// $BG$0UEY$N2sE>(B |
| |
public Point rot(double theta){ |
| |
double cosTheta=Math.cos(theta),sinTheta=Math.sin(theta); |
| |
return new Point(x*cosTheta+y*sinTheta,-x*sinTheta+y*cosTheta); |
| |
} |
| // $B<+J,$H%Y%/%?!<(Bp$B$NFb@Q(B(inner product) |
// $B<+J,$H%Y%/%?!<(Bp$B$NFb@Q(B(inner product) |
| public double product(Point p){ |
public double product(Point p){ |
| return x*p.x+y*p.y; |
return x*p.x+y*p.y; |
| } |
} |
| |
// (1,0)$B$+$i8+$?<+J,$N3QEY(B |
| |
public double theta(){ |
| |
return Math.atan2(-y,x); |
| |
} |
| // $B<+J,$+$i%Y%/%?!<(Bp$B$r8+$?3QEY$N(B cos |
// $B<+J,$+$i%Y%/%?!<(Bp$B$r8+$?3QEY$N(B cos |
| public double cosTheta(Point p){ |
public double cosTheta(Point p){ |
| return product(p)/(p.length()*length()); |
return product(p)/(p.length()*length()); |
| } |
} |
| // $B<+J,$+$i%Y%/%?!<(Bp$B$r8+$?3QEY$N(B sin |
// $B<+J,$+$i%Y%/%?!<(Bp$B$r8+$?3QEY$N(B sin |
| public double cosTheta(Point p){ |
public double sinTheta(Point p){ |
| return rot270().cosTheta(p); |
return rot270().cosTheta(p); |
| } |
} |
| // $B<+J,$+$i%Y%/%?!<(B p $B$r8+$?3QEY(B |
// $B<+J,$+$i%Y%/%?!<(B p $B$r8+$?3QEY(B |
Diff of /java/Point.java
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