| /* |
| * Copyright (C) 2007 The Android Open Source 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.example.android.apis.graphics; |
| |
| import android.content.Context; |
| import android.graphics.*; |
| import android.os.Bundle; |
| import android.view.View; |
| |
| public class DrawPoints extends GraphicsActivity { |
| |
| @Override |
| protected void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(new SampleView(this)); |
| } |
| |
| private static class SampleView extends View { |
| private Paint mPaint = new Paint(); |
| private float[] mPts; |
| |
| private static final float SIZE = 300; |
| private static final int SEGS = 32; |
| private static final int X = 0; |
| private static final int Y = 1; |
| |
| private void buildPoints() { |
| final int ptCount = (SEGS + 1) * 2; |
| mPts = new float[ptCount * 2]; |
| |
| float value = 0; |
| final float delta = SIZE / SEGS; |
| for (int i = 0; i <= SEGS; i++) { |
| mPts[i*4 + X] = SIZE - value; |
| mPts[i*4 + Y] = 0; |
| mPts[i*4 + X + 2] = 0; |
| mPts[i*4 + Y + 2] = value; |
| value += delta; |
| } |
| } |
| |
| public SampleView(Context context) { |
| super(context); |
| |
| buildPoints(); |
| } |
| |
| @Override protected void onDraw(Canvas canvas) { |
| Paint paint = mPaint; |
| |
| canvas.translate(10, 10); |
| |
| canvas.drawColor(Color.WHITE); |
| |
| paint.setColor(Color.RED); |
| paint.setStrokeWidth(0); |
| canvas.drawLines(mPts, paint); |
| |
| paint.setColor(Color.BLUE); |
| paint.setStrokeWidth(3); |
| canvas.drawPoints(mPts, paint); |
| } |
| } |
| } |
| |