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.app.Activity; 20 import android.content.Context; 21 import android.graphics.*; 22 import android.os.Bundle; 23 import android.view.View; 24 25 public class DrawPoints extends GraphicsActivity { 26 27 @Override onCreate(Bundle savedInstanceState)28 protected void onCreate(Bundle savedInstanceState) { 29 super.onCreate(savedInstanceState); 30 setContentView(new SampleView(this)); 31 } 32 33 private static class SampleView extends View { 34 private Paint mPaint = new Paint(); 35 private float[] mPts; 36 37 private static final float SIZE = 300; 38 private static final int SEGS = 32; 39 private static final int X = 0; 40 private static final int Y = 1; 41 buildPoints()42 private void buildPoints() { 43 final int ptCount = (SEGS + 1) * 2; 44 mPts = new float[ptCount * 2]; 45 46 float value = 0; 47 final float delta = SIZE / SEGS; 48 for (int i = 0; i <= SEGS; i++) { 49 mPts[i*4 + X] = SIZE - value; 50 mPts[i*4 + Y] = 0; 51 mPts[i*4 + X + 2] = 0; 52 mPts[i*4 + Y + 2] = value; 53 value += delta; 54 } 55 } 56 SampleView(Context context)57 public SampleView(Context context) { 58 super(context); 59 60 buildPoints(); 61 } 62 onDraw(Canvas canvas)63 @Override protected void onDraw(Canvas canvas) { 64 Paint paint = mPaint; 65 66 canvas.translate(10, 10); 67 68 canvas.drawColor(Color.WHITE); 69 70 paint.setColor(Color.RED); 71 paint.setStrokeWidth(0); 72 canvas.drawLines(mPts, paint); 73 74 paint.setColor(Color.BLUE); 75 paint.setStrokeWidth(3); 76 canvas.drawPoints(mPts, paint); 77 } 78 } 79 } 80 81