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.security.SecureRandom;
import java.util.Random;

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

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

	private Color hColor;
	private Color vColor;

	final Random random = new SecureRandom();

	@Override
	protected void init() throws Exception {
		AssertUtils.assertNotNull(this.hColor, "hColor is required.");
		AssertUtils.assertNotNull(this.vColor, "vColor is required.");
	}

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

		int hStripes = height / 7;
		int vStripes = width / 7;
		int hSpace = height / (hStripes + 1);
		int vSpace = width / (vStripes + 1);

		// Horizontal Stripes
		for (int i = hSpace; i < height; i = i + hSpace) {
			g.setColor(this.hColor);
			g.drawLine(0, i, width, i);
		}

		// Vertical Stripes
		for (int i = vSpace; i < width; i = i + vSpace) {
			g.setColor(this.vColor);
			g.drawLine(i, 0, i, height);
		}
		g.dispose();
	}

	public GridRenderer setHColor(Color hColor) {
		this.assertNotInitialized();
		this.hColor = hColor;
		return this;
	}

	public GridRenderer setVColor(Color vColor) {
		this.assertNotInitialized();
		this.vColor = vColor;
		return this;
	}
}