（转帖）Android系列之浅谈Android 3D旋转
原创地址：http://www.cnblogs.com/jk1001/archive/2010/07/28/1787009.html
最近和一哥们在聊Android的3D旋转效果的技术实现的事情，今天正好有点时间就把技术细节写了出来
在ANDROID中实现3D旋转直接使用animation配合camera就可以实现，在apidemo里就有这样的实例
我们首先做一个继承animation的类Rotate3d.java
1
public
class
Rotate3d extends Animation {
2
private
float
mFromDegree;
3
private
float
mToDegree;
4
private
float
mCenterX;
5
private
float
mCenterY;
6
private
float
mLeft;
7
private
float
mTop;
8
private
Camera mCamera;
9
private
static
final String TAG
=
"
Rotate3d
"
;
10
11
public
Rotate3d(
float
fromDegree,
float
toDegree,
float
left,
float
top,
12
float
centerX,
float
centerY) {
13
this
.mFromDegree
=
fromDegree;
14
this
.mToDegree
=
toDegree;
15
this
.mLeft
=
left;
16
this
.mTop
=
top;
17
this
.mCenterX
=
centerX;
18
this
.mCenterY
=
centerY;
19
20
}
21
22
@Override
23
public
void
initialize(
int
width,
int
height,
int
parentWidth,
24
int
parentHeight) {
25
super.initialize(width, height, parentWidth, parentHeight);
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mCamera
=
new
Camera();
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}
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@Override
30
protected
void
applyTransformation(
float
interpolatedTime, Transformation t) {
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final
float
FromDegree
=
mFromDegree;
32
float
degrees
=
FromDegree
+
(mToDegree
-
mFromDegree)
33
*
interpolatedTime;
34
final
float
centerX
=
mCenterX;
35
final
float
centerY
=
mCenterY;
36
final Matrix matrix
=
t.getMatrix();
37
38
if
(degrees
<=
-
76.0f
) {
39
degrees
=
-
90.0f
;
40
mCamera.save();
41
mCamera.rotateY(degrees);
42
mCamera.getMatrix(matrix);
43
mCamera.restore();
44
}
else
if
(degrees
>=
76.0f
){
45
degrees
=
90.0f
;
46
mCamera.save();
47
mCamera.rotateY(degrees);
48
mCamera.getMatrix(matrix);
49
mCamera.restore();
50
}
else
{
51
mCamera.save();
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//
这里很重要哦。
53
mCamera.translate(
0
,
0
, centerX);
54
mCamera.rotateY(degrees);
55
mCamera.translate(
0
,
0
,
-
centerX);
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mCamera.getMatrix(matrix);
57
mCamera.restore();
58
}
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matrix.preTranslate(
-
centerX,
-
centerY);
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matrix.postTranslate(centerX, centerY);
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}
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}
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public
class
Rotate3d extends Animation {
66
private
float
mFromDegree;
67
private
float
mToDegree;
68
private
float
mCenterX;
69
private
float
mCenterY;
70
private
float
mLeft;
71
private
float
mTop;
72
private
Camera mCamera;
73
private
static
final String TAG
=
"
Rotate3d
"
;
74
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public
Rotate3d(
float
fromDegree,
float
toDegree,
float
left,
float
top,
76
float
centerX,
float
centerY) {
77
this
.mFromDegree
=
fromDegree;
78
this
.mToDegree
=
toDegree;
79
this
.mLeft
=
left;
80
this
.mTop
=
top;
81
this
.mCenterX
=
centerX;
82
this
.mCenterY
=
centerY;
83
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}
85
86
@Override
87
public
void
initialize(
int
width,
int
height,
int
parentWidth,
88
int
parentHeight) {
89
super.initialize(width, height, parentWidth, parentHeight);
90
mCamera
=
new
Camera();
91
}
92
93
@Override
94
protected
void
applyTransformation(
float
interpolatedTime, Transformation t) {
95
final
float
FromDegree
=
mFromDegree;
96
float
degrees
=
FromDegree
+
(mToDegree
-
mFromDegree)
97
*
interpolatedTime;
98
final
float
centerX
=
mCenterX;
99
final
float
centerY
=
mCenterY;
100
final Matrix matrix
=
t.getMatrix();
101
102
if
(degrees
<=
-
76.0f
) {
103
degrees
=
-
90.0f
;
104
mCamera.save();
105
mCamera.rotateY(degrees);
106
mCamera.getMatrix(matrix);
107
mCamera.restore();
108
}
else
if
(degrees
>=
76.0f
){
109
degrees
=
90.0f
;
110
mCamera.save();
111
mCamera.rotateY(degrees);
112
mCamera.getMatrix(matrix);
113
mCamera.restore();
114
}
else
{
115
mCamera.save();
116
//
这里很重要哦。
117
mCamera.translate(
0
,
0
, centerX);
118
mCamera.rotateY(degrees);
119
mCamera.translate(
0
,
0
,
-
centerX);
120
mCamera.getMatrix(matrix);
121
mCamera.restore();
122
}
123
124
matrix.preTranslate(
-
centerX,
-
centerY);
125
matrix.postTranslate(centerX, centerY);
126
}
127
}
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有了这个类一切都会变得简单的，接着只要在activity中写两个Rotate3d的对象，让两个view,分别做这两个对象的animation就好了;
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//
下面两句很关键哦，
2
Rotate3d leftAnimation
=
new
Rotate3d(
-
0
,
-
90
,
0
,
0
, mCenterX, mCenterY);
3
Rotate3d rightAnimation
=
new
Rotate3d(
-
0
+
90
,
-
90
+
90
,
0.0f
,
0.0f
, mCenterX, mCenterY);
4
5
leftAnimation.setFillAfter(
true
);
6
leftAnimation.setDuration(
1000
);
7
rightAnimation.setFillAfter(
true
);
8
rightAnimation.setDuration(
1000
);
9
10
mImageView1.startAnimation(leftAnimation);
11
mImageView2.startAnimation(rightAnimation);
12
最后就是还要写一下mImageView1,mImageView2的xml,
1
<?
xml version="1.0" encoding="utf-8"
?>
2
<
LinearLayout
xmlns:android
="http://schemas.android.com/apk/res/android"
3
android:orientation
="vertical"
4
android:layout_width
="fill_parent"
5
android:layout_height
="wrap_content"
6
>
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<
FrameLayout
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android:layout_width
="fill_parent"
10
android:layout_height
="fill_parent"
>
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<
ImageView
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android:id
="@+id/image1"
14
android:layout_gravity
="center_horizontal"
15
android:layout_width
="fill_parent"
16
android:layout_height
="wrap_content"
17
android:src
="@drawable/image1"
18
/>
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<
ImageView
20
android:id
="@+id/image2"
21
android:background
="#ffff0000"
22
android:layout_gravity
="center_horizontal"
23
android:layout_width
="fill_parent"
24
android:layout_height
="wrap_content"
25
android:src
="@drawable/image2"
26
/>
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</
FrameLayout
>
29
</
LinearLayout
>
需要源代码的留下邮箱！