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 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 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 56 public SampleView(Context context) { 57 super(context); 58 59 buildPoints(); 60 } 61 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
