1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/*
* $RCSfile$
*
* Copyright (c) 2004 Sun Microsystems, Inc. All rights reserved.
*
* Use is subject to license terms.
*
* $Revision$
* $Date$
* $State$
*/
package javax.vecmath;
import java.lang.Math;
/**
* A 4-element vector represented by single-precision floating point x,y,z,w
* coordinates.
*
*/
public class Vector4f extends Tuple4f implements java.io.Serializable {
// Compatible with 1.1
static final long serialVersionUID = 8749319902347760659L;
/**
* Constructs and initializes a Vector4f from the specified xyzw coordinates.
* @param x the x coordinate
* @param y the y coordinate
* @param z the z coordinate
* @param w the w coordinate
*/
public Vector4f(float x, float y, float z, float w)
{
super(x,y,z,w);
}
/**
* Constructs and initializes a Vector4f from the array of length 4.
* @param v the array of length 4 containing xyzw in order
*/
public Vector4f(float[] v)
{
super(v);
}
/**
* Constructs and initializes a Vector4f from the specified Vector4f.
* @param v1 the Vector4f containing the initialization x y z w data
*/
public Vector4f(Vector4f v1)
{
super(v1);
}
/**
* Constructs and initializes a Vector4f from the specified Vector4d.
* @param v1 the Vector4d containing the initialization x y z w data
*/
public Vector4f(Vector4d v1)
{
super(v1);
}
/**
* Constructs and initializes a Vector4f from the specified Tuple4f.
* @param t1 the Tuple4f containing the initialization x y z w data
*/
public Vector4f(Tuple4f t1)
{
super(t1);
}
/**
* Constructs and initializes a Vector4f from the specified Tuple4d.
* @param t1 the Tuple4d containing the initialization x y z w data
*/
public Vector4f(Tuple4d t1)
{
super(t1);
}
/**
* Constructs and initializes a Vector4f from the specified Tuple3f.
* The x,y,z components of this vector are set to the corresponding
* components of tuple t1. The w component of this vector
* is set to 0.
* @param t1 the tuple to be copied
*
* @since Java 3D 1.2
*/
public Vector4f(Tuple3f t1) {
super(t1.x, t1.y, t1.z, 0.0f);
}
/**
* Constructs and initializes a Vector4f to (0,0,0,0).
*/
public Vector4f()
{
super();
}
/**
* Sets the x,y,z components of this vector to the corresponding
* components of tuple t1. The w component of this vector
* is set to 0.
* @param t1 the tuple to be copied
*
* @since Java 3D 1.2
*/
public final void set(Tuple3f t1) {
this.x = t1.x;
this.y = t1.y;
this.z = t1.z;
this.w = 0.0f;
}
/**
* Returns the length of this vector.
* @return the length of this vector as a float
*/
public final float length()
{
return
(float) Math.sqrt(this.x*this.x + this.y*this.y +
this.z*this.z + this.w*this.w);
}
/**
* Returns the squared length of this vector
* @return the squared length of this vector as a float
*/
public final float lengthSquared()
{
return (this.x*this.x + this.y*this.y +
this.z*this.z + this.w*this.w);
}
/**
* returns the dot product of this vector and v1
* @param v1 the other vector
* @return the dot product of this vector and v1
*/
public final float dot(Vector4f v1)
{
return (this.x*v1.x + this.y*v1.y + this.z*v1.z + this.w*v1.w);
}
/**
* Sets the value of this vector to the normalization of vector v1.
* @param v1 the un-normalized vector
*/
public final void normalize(Vector4f v1)
{
float norm;
norm = (float) (1.0/Math.sqrt(v1.x*v1.x + v1.y*v1.y +
v1.z*v1.z + v1.w*v1.w));
this.x = v1.x*norm;
this.y = v1.y*norm;
this.z = v1.z*norm;
this.w = v1.w*norm;
}
/**
* Normalizes this vector in place.
*/
public final void normalize()
{
float norm;
norm = (float) (1.0/Math.sqrt(this.x*this.x + this.y*this.y +
this.z*this.z + this.w*this.w));
this.x *= norm;
this.y *= norm;
this.z *= norm;
this.w *= norm;
}
/**
* Returns the (4-space) angle in radians between this vector and
* the vector parameter; the return value is constrained to the
* range [0,PI].
* @param v1 the other vector
* @return the angle in radians in the range [0,PI]
*/
public final float angle(Vector4f v1)
{
double vDot = this.dot(v1) / ( this.length()*v1.length() );
if( vDot < -1.0) vDot = -1.0;
if( vDot > 1.0) vDot = 1.0;
return((float) (Math.acos( vDot )));
}
}
|
