com.appslandia.plum.captcha.GridRenderer Maven / Gradle / Ivy

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// The MIT License (MIT)
// Copyright © 2015 AppsLandia. All rights reserved.

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package com.appslandia.plum.captcha;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import com.appslandia.common.base.InitializeObject;
import com.appslandia.common.utils.RandomUtils;

/**
 *
 * @author Loc Ha
 *
 */
public class GridRenderer extends InitializeObject implements ImageRenderer {

  final List hColors = new ArrayList();
  final List vColors = new ArrayList();

  @Override
  protected void init() throws Exception {
    if (this.hColors.isEmpty()) {
      hColor(Color.LIGHT_GRAY).hColor(Color.GRAY).hColor(Color.DARK_GRAY);
    }

    if (this.vColors.isEmpty()) {
      vColor(Color.LIGHT_GRAY).vColor(Color.GRAY).vColor(Color.DARK_GRAY);
    }
  }

  @Override
  public void render(BufferedImage img, int width, int height) {
    this.initialize();
    Graphics2D g = img.createGraphics();

    Random rand = CaptchaUtils.RandomHolder.instance;

    // Horizontal Stripes
    for (int i = 8; i < height; i = i + RandomUtils.nextInt(6, 10, rand)) {
      g.setColor(this.hColors.get(rand.nextInt(this.hColors.size())));
      g.drawLine(0, i, width, i);
    }

    // Vertical Stripes
    for (int i = 8; i < width; i = i + RandomUtils.nextInt(6, 10, rand)) {
      g.setColor(this.vColors.get(rand.nextInt(this.vColors.size())));
      g.drawLine(i, 0, i, height);
    }
    g.dispose();
  }

  public GridRenderer hColor(Color color) {
    this.assertNotInitialized();
    this.hColors.add(color);
    return this;
  }

  public GridRenderer vColor(Color color) {
    this.assertNotInitialized();
    this.vColors.add(color);
    return this;
  }
}