1 /*
2  * Copyright (C) 2007 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.example.android.apis.graphics;
18 
19 import android.content.Context;
20 import android.graphics.*;
21 import android.os.Bundle;
22 import android.view.View;
23 
24 public class DrawPoints extends GraphicsActivity {
25 
26     @Override
onCreate(Bundle savedInstanceState)27     protected void onCreate(Bundle savedInstanceState) {
28         super.onCreate(savedInstanceState);
29         setContentView(new SampleView(this));
30     }
31 
32     private static class SampleView extends View {
33         private Paint   mPaint = new Paint();
34         private float[] mPts;
35 
36         private static final float SIZE = 300;
37         private static final int SEGS = 32;
38         private static final int X = 0;
39         private static final int Y = 1;
40 
buildPoints()41         private void buildPoints() {
42             final int ptCount = (SEGS + 1) * 2;
43             mPts = new float[ptCount * 2];
44 
45             float value = 0;
46             final float delta = SIZE / SEGS;
47             for (int i = 0; i <= SEGS; i++) {
48                 mPts[i*4 + X] = SIZE - value;
49                 mPts[i*4 + Y] = 0;
50                 mPts[i*4 + X + 2] = 0;
51                 mPts[i*4 + Y + 2] = value;
52                 value += delta;
53             }
54         }
55 
SampleView(Context context)56         public SampleView(Context context) {
57             super(context);
58 
59             buildPoints();
60         }
61 
onDraw(Canvas canvas)62         @Override protected void onDraw(Canvas canvas) {
63             Paint paint = mPaint;
64 
65             canvas.translate(10, 10);
66 
67             canvas.drawColor(Color.WHITE);
68 
69             paint.setColor(Color.RED);
70             paint.setStrokeWidth(0);
71             canvas.drawLines(mPts, paint);
72 
73             paint.setColor(Color.BLUE);
74             paint.setStrokeWidth(3);
75             canvas.drawPoints(mPts, paint);
76         }
77     }
78 }
79 
80