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
|
public class CameraPreview extends Activity
{
private Preview mPreview = null ;
/** Called when the activity is first created.*/
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState) ;
requestWindowFeature(Window.FEATURE_NO_TITLE) ; // Hide the window title.
mPreview = new Preview(this) ; // Create our Preview view and set it as the content of our activity.
setContentView(mPreview) ;
}
}
class Preview extends SurfaceView implements SurfaceHolder.Callback
{
SurfaceHolder mHolder;
Camera mCamera;
public Preview(Context context)
{
super(context);
// Install a SurfaceHolder.Callback so we get notified when the underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
try {
// ... Initialisations ...
}
catch ( Error E )
{
System.exit(0) ;
}
catch ( Exception E )
{
System.exit(0) ;
}
Log.i("Start", "Start Camera Preview") ;
}
private int nb = 0 ;
public void surfaceCreated(SurfaceHolder holder)
{ // The Surface has been created, acquire the camera and tell it where to draw.
mCamera = Camera.open();
mCamera.setPreviewCallback(
new PreviewCallback()
{
public void onPreviewFrame(byte[] data, Camera camera)
{ // On utilise cette méthode pour récupérer l'image de la caméra et ainsi travailler dessus.
Camera.Parameters parameters = camera.getParameters() ;
int height = parameters.getPreviewSize().height ;
int width = parameters.getPreviewSize().width ;
//... Traitement de ma vidéo ...
invalidate() ;
}
}
) ;
try {
mCamera.setPreviewDisplay(holder);
}
catch (Exception exception)
{
mCamera.release();
mCamera = null;
}
}
private Paint circlePaint = new Paint(Paint.ANTI_ALIAS_FLAG); // Lisser les formes
protected void onDraw(Canvas canvas)
{ // Pour l'instant j'essaie juste d'afficher un cercle sur ma vidéo.
super.onDraw(canvas) ;
canvas.drawColor(Color.WHITE) ;
int centerX = getMeasuredWidth() / 2 ;
int centerY = getMeasuredHeight() / 2 ;
// On détermine le diamètre du cercle (arrière plan de la boussole)
int radius = Math.min(centerX, centerY);
// On dessine un cercle avec le " pinceau " circlePaint
canvas.drawCircle(centerX, centerY, radius, circlePaint) ;
}
public void surfaceDestroyed(SurfaceHolder holder)
{
// Surface will be destroyed when we return, so stop the preview.
// Because the CameraDevice object is not a shared resource, it's very important to release it when the activity is paused.
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
private Size getOptimalPreviewSize(List<Size> sizes, int w, int h)
{
final double ASPECT_TOLERANCE = 0.05;
double targetRatio = (double) w / h;
if (sizes == null) return null;
Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
// Try to find an size match aspect ratio and size
for (Size size : sizes)
{
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
if (Math.abs(size.height - targetHeight) < minDiff)
{
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
// Cannot find the one match the aspect ratio, ignore the requirement
if (optimalSize == null)
{
minDiff = Double.MAX_VALUE;
for (Size size : sizes)
{
if (Math.abs(size.height - targetHeight) < minDiff)
{
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h)
{
// Now that the size is known, set up the camera parameters and begin the preview.
Camera.Parameters parameters = mCamera.getParameters() ;
List<Size> sizes = parameters.getSupportedPreviewSizes() ;
Size optimalSize = getOptimalPreviewSize(sizes, w, h) ;
parameters.setPreviewSize(optimalSize.width, optimalSize.height) ;
mCamera.setParameters(parameters) ;
mCamera.startPreview() ;
}
} |
Camera et onDraw
ton poste tu dois marquer quand la bonne réponse tu as obtenu.
Répondre avec citation
Envoyé par MrDuChnok
Partager