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package org.aoju.bus.extra.captcha.provider;
import org.aoju.bus.core.toolkit.ImageKit;
import org.aoju.bus.core.toolkit.ObjectKit;
import org.aoju.bus.core.toolkit.RandomKit;
import java.awt.*;
import java.awt.image.BufferedImage;
/**
* 扭曲干扰验证码
*
* @author Kimi Liu
* @since Java 17+
*/
public class ShearProvider extends AbstractProvider {
/**
* 构造
*
* @param width 图片宽
* @param height 图片高
*/
public ShearProvider(int width, int height) {
this(width, height, 5);
}
/**
* 构造
*
* @param width 图片宽
* @param height 图片高
* @param codeCount 字符个数
*/
public ShearProvider(int width, int height, int codeCount) {
this(width, height, codeCount, 4);
}
/**
* 构造
*
* @param width 图片宽
* @param height 图片高
* @param codeCount 字符个数
* @param thickness 干扰线宽度
*/
public ShearProvider(int width, int height, int codeCount, int thickness) {
super(width, height, codeCount, thickness);
}
@Override
public Image createImage(String code) {
final BufferedImage image = new BufferedImage(this.width, this.height, BufferedImage.TYPE_INT_RGB);
final Graphics2D g = org.aoju.bus.core.lang.Graphics.createGraphics(image, ObjectKit.defaultIfNull(this.background, Color.WHITE));
// 画字符串
drawString(g, code);
// 扭曲
shear(g, this.width, this.height, ObjectKit.defaultIfNull(this.background, Color.WHITE));
// 画干扰线
drawInterfere(g, 0, RandomKit.randomInt(this.height) + 1, this.width, RandomKit.randomInt(this.height) + 1, this.interfereCount, ImageKit.randomColor());
return image;
}
/**
* 绘制字符串
*
* @param g {@link Graphics}画笔
* @param code 验证码
*/
private void drawString(Graphics2D g, String code) {
// 指定透明度
if (null != this.textAlpha) {
g.setComposite(this.textAlpha);
}
org.aoju.bus.core.lang.Graphics.drawStringColourful(g, code, this.font, this.width, this.height);
}
/**
* 扭曲
*
* @param g {@link Graphics}
* @param w1 w1
* @param h1 h1
* @param color 颜色
*/
private void shear(Graphics g, int w1, int h1, Color color) {
shearX(g, w1, h1, color);
shearY(g, w1, h1, color);
}
/**
* X坐标扭曲
*
* @param g {@link Graphics}
* @param w1 宽
* @param h1 高
* @param color 颜色
*/
private void shearX(Graphics g, int w1, int h1, Color color) {
int period = RandomKit.randomInt(this.width);
int frames = 1;
int phase = RandomKit.randomInt(2);
for (int i = 0; i < h1; i++) {
double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
g.copyArea(0, i, w1, 1, (int) d, 0);
g.setColor(color);
g.drawLine((int) d, i, 0, i);
g.drawLine((int) d + w1, i, w1, i);
}
}
/**
* Y坐标扭曲
*
* @param g {@link Graphics}
* @param w1 宽
* @param h1 高
* @param color 颜色
*/
private void shearY(Graphics g, int w1, int h1, Color color) {
int period = RandomKit.randomInt(this.height >> 1);
int frames = 20;
int phase = 7;
for (int i = 0; i < w1; i++) {
double d = (double) (period >> 1) * Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
g.copyArea(i, 0, 1, h1, 0, (int) d);
g.setColor(color);
// 擦除原位置的痕迹
g.drawLine(i, (int) d, i, 0);
g.drawLine(i, (int) d + h1, i, h1);
}
}
/**
* 干扰线
*
* @param g {@link Graphics}
* @param x1 x1
* @param y1 y1
* @param x2 x2
* @param y2 y2
* @param thickness 粗细
* @param c 颜色
*/
private void drawInterfere(Graphics g, int x1, int y1, int x2, int y2, int thickness, Color c) {
// The thick line is in fact a filled polygon
g.setColor(c);
int dX = x2 - x1;
int dY = y2 - y1;
// line length
double lineLength = Math.sqrt(dX * dX + dY * dY);
double scale = (double) (thickness) / (2 * lineLength);
// The x and y increments from an endpoint needed to create a
// rectangle...
double ddx = -scale * (double) dY;
double ddy = scale * (double) dX;
ddx += (ddx > 0) ? 0.5 : -0.5;
ddy += (ddy > 0) ? 0.5 : -0.5;
int dx = (int) ddx;
int dy = (int) ddy;
// Now we can compute the corner points...
int[] xPoints = new int[4];
int[] yPoints = new int[4];
xPoints[0] = x1 + dx;
yPoints[0] = y1 + dy;
xPoints[1] = x1 - dx;
yPoints[1] = y1 - dy;
xPoints[2] = x2 - dx;
yPoints[2] = y2 - dy;
xPoints[3] = x2 + dx;
yPoints[3] = y2 + dy;
g.fillPolygon(xPoints, yPoints, 4);
}
}
