275 lines
5.9 KiB
Java
275 lines
5.9 KiB
Java
/**
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Copyright 2004-2008 Ricard Marxer <email@ricardmarxer.com>
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This file is part of Geomerative.
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Geomerative is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Geomerative is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Geomerative. If not, see <http://www.gnu.org/licenses/>.
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*/
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package geomerative;
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import processing.core.*;
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/**
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* RPoint is a very simple interface for creating, holding and drawing 2D points.
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* @eexample RPoint
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* @usage Geometry
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* @related x
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* @related y
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*/
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public class RPoint extends PVector
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{
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/**
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* Create a new point, given the coordinates.
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* @eexample RPoint_constructor
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* @usage Geometry
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* @param x the x coordinate of the new point
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* @param y the y coordinate of the new point
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* @related x
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* @related y
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*/
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public RPoint(float x,float y)
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{
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super(x, y);
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}
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public RPoint(double x, double y)
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{
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super((float)x, (float)y);
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}
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/**
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* Create a new point at (0, 0).
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* @eexample RPoint_constructor
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* @usage Geometry
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* @related x
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* @related y
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*/
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public RPoint()
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{
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super(0, 0);
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}
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/**
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* Copy a point.
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* @eexample RPoint_constructor
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* @usage Geometry
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* @param p the point we wish to make a copy of
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* @related x
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* @related y
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*/
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public RPoint(RPoint p)
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{
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this(p.x, p.y);
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}
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/**
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* @invisible
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*/
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float getX()
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{
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return this.x;
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}
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/**
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* @invisible
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*/
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float getY()
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{
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return this.y;
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}
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/**
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* @invisible
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*/
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void setLocation(float nx, float ny)
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{
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set(nx, ny, 0);
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}
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/**
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* Use this to apply a transformation to the point.
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* @eexample RPoint_transform
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* @usage Geometry
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* @param m the transformation matrix to be applied
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* @related translate ( )
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* @related rotate ( )
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* @related scale ( )
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*/
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public void transform(RMatrix m)
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{
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float tempx = m.m00*x + m.m01*y + m.m02;
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float tempy = m.m10*x + m.m11*y + m.m12;
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x = tempx;
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y = tempy;
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}
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/**
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* Apply a translation to the point.
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* @eexample RPoint_translate
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* @usage Geometry
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* @param tx the coefficient of x translation
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* @param ty the coefficient of y translation
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* @related transform ( )
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* @related rotate ( )
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* @related scale ( )
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*/
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public void translate(float tx, float ty)
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{
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add(tx, ty, 0);
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}
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/**
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* Apply a translation to the point.
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* @eexample RPoint_translate
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* @usage Geometry
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* @param t the translation vector to be applied
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* @related transform ( )
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* @related rotate ( )
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* @related scale ( )
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*/
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public void translate(RPoint t)
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{
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add(t);
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}
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/**
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* Apply a rotation to the point, given the angle and optionally the coordinates of the center of rotation.
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* @eexample RPoint_rotate
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* @usage Geometry
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* @param angle the angle of rotation to be applied
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* @param vx the x coordinate of the center of rotation
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* @param vy the y coordinate of the center of rotation
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* @related transform ( )
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* @related translate ( )
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* @related scale ( )
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*/
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public void rotate(float angle, float vx, float vy)
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{
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sub(vx, vy, 0);
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rotate(angle);
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add(vx, vy, 0);
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}
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/**
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* Apply a rotation to the point, given the angle and optionally the point of the center of rotation.
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* @eexample RPoint_rotate
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* @usage Geometry
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* @param angle the angle of rotation to be applied
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* @param v the position vector of the center of rotation
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* @related transform ( )
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* @related translate ( )
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* @related scale ( )
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*/
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public void rotate(float angle, RPoint v)
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{
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sub(v);
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rotate(angle);
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add(v);
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}
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/**
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* Apply a scaling to the point, given the scaling factors.
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* @eexample RPoint_scale
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* @usage Geometry
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* @param sx the scaling coefficient over the x axis
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* @param sy the scaling coefficient over the y axis
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* @related transform ( )
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* @related translate ( )
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* @related rotate ( )
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*/
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public void scale (float sx, float sy)
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{
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this.x *= sx;
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this.y *= sy;
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}
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/**
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* Apply a scaling to the point, given a scaling factor.
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* @eexample RPoint_scale
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* @usage Geometry
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* @param s the scaling coefficient for a uniform scaling
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* @related transform ( )
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* @related translate ( )
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* @related rotate ( )
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*/
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public void scale (float s)
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{
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mult(s);
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}
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/**
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* Apply a scaling to the point, given a scaling vector.
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* @eexample RPoint_scale
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* @usage Geometry
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* @param s the scaling vector
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* @related transform ( )
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* @related translate ( )
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* @related rotate ( )
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*/
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public void scale (RPoint s)
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{
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mult(s);
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}
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/**
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* Use this to obtain the norm of the point.
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* @eexample RPoint_norm
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* @usage Geometry
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* @return float, the norm of the point
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* @related angle ( )
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*/
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public float norm ()
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{
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return mag();
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}
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/**
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* Use this to obtain the square norm of the point.
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* @eexample RPoint_norm
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* @usage Geometry
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* @return float, the norm of the point
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* @related angle ( )
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*/
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public float sqrnorm ()
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{
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return magSq();
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}
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/**
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* Use this to obtain the angle between the vector and another vector
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* @eexample RPoint_angle
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* @usage Geometry
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* @param p the vector relative to which we want to evaluate the angle
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* @return float, the angle between the two vectors
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* @related norm ( )
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*/
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public float angle (RPoint p)
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{
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return PVector.angleBetween((PVector)this, (PVector)p);
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}
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public void print(){
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System.out.print("("+x+","+y+")\n");
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}
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}
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