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
|
/*
* Copyright (C) 2012 The Android Open Source Project
* Copyright (C) 2013-2015 The CyanogenMod Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.camera.ui;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;
import com.android.camera.CameraManager;
public class HistogramView extends View {
private static final int STATS_SIZE = 256;
private int[] mData = new int[STATS_SIZE + 1];
private boolean mDataValid;
private Bitmap mBitmap;
private Paint mPaint = new Paint();
private Paint mPaintRect = new Paint();
private Canvas mCanvas = new Canvas();
private float mWidth;
private float mHeight;
private CameraManager.CameraProxy mGraphCameraDevice;
public HistogramView(Context context, AttributeSet attrs) {
super(context,attrs);
mPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
mPaintRect.setColor(0xFFFFFFFF);
mPaintRect.setStyle(Paint.Style.FILL);
}
public void setCamera(CameraManager.CameraProxy camera) {
mGraphCameraDevice = camera;
if (camera == null) {
mDataValid = false;
}
}
public void updateData(int[] data) {
if (data.length == mData.length) {
System.arraycopy(data, 0, mData, 0, data.length);
drawGraph();
mDataValid = true;
invalidate();
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.RGB_565);
mCanvas.setBitmap(mBitmap);
mWidth = w;
mHeight = h;
if (mDataValid) {
drawGraph();
}
super.onSizeChanged(w, h, oldw, oldh);
}
@Override
protected void onDraw(Canvas canvas) {
if (mDataValid && mBitmap != null) {
canvas.drawBitmap(mBitmap, 0, 0, null);
if (mGraphCameraDevice != null) {
mGraphCameraDevice.sendHistogramData();
}
}
}
private void drawGraph() {
final float border = 5;
float graphheight = mHeight - (2 * border);
float graphwidth = mWidth - (2 * border);
float bargap = 0.0f;
float barwidth = graphwidth/STATS_SIZE;
mCanvas.drawColor(0xFFAAAAAA);
mPaint.setColor(Color.BLACK);
for (int k = 0; k <= (graphheight /32) ; k++) {
float y = (float)(32 * k)+ border;
mCanvas.drawLine(border, y, graphwidth + border , y, mPaint);
}
for (int j = 0; j <= (graphwidth /32); j++) {
float x = (float)(32 * j)+ border;
mCanvas.drawLine(x, border, x, graphheight + border, mPaint);
}
//Assumption: The first element contains the maximum value.
int maxValue = Integer.MIN_VALUE;
if (mData[0] == 0) {
for (int i = 1; i <= STATS_SIZE ; i++) {
maxValue = Math.max(maxValue, mData[i]);
}
} else {
maxValue = mData[0];
}
for (int i = 1; i <= STATS_SIZE; i++) {
float scaled = Math.min(STATS_SIZE,
(float) mData[i] * (float) STATS_SIZE / (float) maxValue);
float left = (bargap * (i+1)) + (barwidth * i) + border;
float top = graphheight + border;
float right = left + barwidth;
float bottom = top - scaled;
mCanvas.drawRect(left, top, right, bottom, mPaintRect);
}
}
}
|
