xfermodes.java

来自「Google s android SDK」· Java 代码 · 共 59 行

/* 
 * 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;

// Need the following import to get access to the app resources, since this
// class is in a sub-package.
//import com.google.android.samples.R;

import android.app.Activity;
import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.view.View;

/** Sample code for drawing with some of the Xfermodes.
*/
public class Xfermodes 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();

        public SampleView(Context context) {
            super(context);

            mPaint.setColor(Color.RED);
            mPaint.setStrokeWidth(8);
            mPaint.setXfermode(new PixelXorXfermode(Color.WHITE));
        }
        
        @Override protected void onDraw(Canvas canvas) {
            canvas.drawColor(Color.WHITE);

            canvas.drawLine(100, 50, 200, 150, mPaint);
            canvas.drawLine(100, 150, 200, 50, mPaint);
        }
    }
}