1 /*
2  * Copyright (C) 2014 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.camera.ui;
18 
19 import android.content.Context;
20 import android.graphics.Canvas;
21 import android.graphics.Paint;
22 import android.graphics.RectF;
23 import android.util.AttributeSet;
24 import android.view.View;
25 
26 import com.android.camera2.R;
27 
28 /**
29  * GridLines is a view which directly overlays the preview and draws
30  * evenly spaced grid lines.
31  */
32 public class GridLines extends View
33     implements PreviewStatusListener.PreviewAreaChangedListener {
34 
35     private RectF mDrawBounds;
36     Paint mPaint = new Paint();
37 
GridLines(Context context, AttributeSet attrs)38     public GridLines(Context context, AttributeSet attrs) {
39         super(context, attrs);
40         mPaint.setStrokeWidth(getResources().getDimensionPixelSize(R.dimen.grid_line_width));
41         mPaint.setColor(getResources().getColor(R.color.grid_line));
42     }
43 
44     @Override
onDraw(Canvas canvas)45     public void onDraw(Canvas canvas) {
46         super.onDraw(canvas);
47         if (mDrawBounds != null) {
48             float thirdWidth = mDrawBounds.width() / 3;
49             float thirdHeight = mDrawBounds.height() / 3;
50             for (int i = 1; i < 3; i++) {
51                 // Draw the vertical lines.
52                 final float x = thirdWidth * i;
53                 canvas.drawLine(mDrawBounds.left + x, mDrawBounds.top,
54                         mDrawBounds.left + x, mDrawBounds.bottom, mPaint);
55                 // Draw the horizontal lines.
56                 final float y = thirdHeight * i;
57                 canvas.drawLine(mDrawBounds.left, mDrawBounds.top + y,
58                         mDrawBounds.right, mDrawBounds.top + y, mPaint);
59             }
60         }
61     }
62 
63     @Override
onPreviewAreaChanged(final RectF previewArea)64     public void onPreviewAreaChanged(final RectF previewArea) {
65         setDrawBounds(previewArea);
66     }
67 
setDrawBounds(final RectF previewArea)68     private void setDrawBounds(final RectF previewArea) {
69         mDrawBounds = new RectF(previewArea);
70         invalidate();
71     }
72 }
73