/*
* Copyright (C) 2007 Google Inc.
*
* 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.google.android.samples.graphics;
import android.app.Activity;
import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.view.View;
import java.util.Random;
public class DrawPoints extends Activity {
@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private Paint mPaint = new Paint();
private float[] mPts = new float[1000];
public SampleView(Context context) {
super(context);
Random rand = new Random();
final int N = mPts.length >> 1;
for (int i = 0; i < N; i++) {
mPts[(i << 1) + 0] = rand.nextFloat() * 320; // X
mPts[(i << 1) + 1] = rand.nextFloat() * 240; // Y
}
}
@Override protected void onDraw(Canvas canvas) {
Paint paint = mPaint;
canvas.drawColor(Color.WHITE);
paint.setAntiAlias(true);
// ROUND cap + width > 0 ... Squares (pretty slow)
paint.setColor(Color.BLUE);
paint.setStrokeCap(Paint.Cap.SQUARE);
paint.setStrokeWidth(10);
canvas.drawPoints(mPts, paint);
// SQUARE cap + width > 0 ... Circles (very slow)
paint.setColor(Color.GREEN);
paint.setStrokeWidth(6);
paint.setStrokeCap(Paint.Cap.ROUND);
canvas.drawPoints(mPts, paint);
// antialias + width == 0 ... blurry pixels (pretty fast)
paint.setColor(Color.RED);
paint.setStrokeWidth(0);
canvas.drawPoints(mPts, paint);
// no-antialias + width == 0 ... single pixels (very fast)
paint.setColor(Color.BLACK);
paint.setAntiAlias(false);
canvas.drawPoints(mPts, paint);
}
}
}
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