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package org.dromara.business.utils; |
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import javax.imageio.ImageIO; |
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import java.awt.*; |
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import java.awt.image.BufferedImage; |
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import java.io.ByteArrayOutputStream; |
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import java.io.File; |
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import java.io.IOException; |
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import java.net.URL; |
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import java.util.Base64; |
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public class ImageRotator { |
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/** |
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* 旋转图片并叠加到另一个图片上 |
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* @param sourceImagePath 源图片路径 |
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* @param targetImagePath 目标图片路径 |
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* @param angle 旋转角度（顺时针） |
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* @return 处理后的图片的Base64字符串 |
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*/ |
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public static String rotateAndOverlayImage(String sourceImagePath, String targetImagePath, double angle) { |
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try { |
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URL resourceUrl = ImageRotator.class.getClassLoader().getResource("templates/1.png"); |
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URL targetUrl = ImageRotator.class.getClassLoader().getResource("templates/2.png"); |
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// 读取源图片和目标图片
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BufferedImage sourceImage = ImageIO.read(new File(resourceUrl.getPath())); |
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BufferedImage targetImage = ImageIO.read(new File(targetUrl.getPath())); |
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// 创建旋转后的图片
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BufferedImage rotatedImage = rotateImage(sourceImage, angle); |
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// 创建新的画布，使用目标图片的尺寸
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BufferedImage resultImage = new BufferedImage( |
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targetImage.getWidth(), |
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targetImage.getHeight(), |
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BufferedImage.TYPE_INT_ARGB |
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); |
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// 创建图形上下文
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Graphics2D g2d = resultImage.createGraphics(); |
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// 绘制目标图片
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g2d.drawImage(targetImage, 0, 0, null); |
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// 计算旋转图片的位置（居中）
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int x = (targetImage.getWidth() - rotatedImage.getWidth()) / 2; |
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int y = (targetImage.getHeight() - rotatedImage.getHeight()) / 2; |
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// 绘制旋转后的图片
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g2d.drawImage(rotatedImage, x, y, null); |
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// 释放图形上下文
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g2d.dispose(); |
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// 转换为Base64
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return convertToBase64(resultImage); |
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} catch (IOException e) { |
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e.printStackTrace(); |
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return null; |
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} |
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} |
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/** |
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* 旋转图片 |
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* @param image 要旋转的图片 |
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* @param angle 旋转角度（顺时针） |
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* @return 旋转后的图片 |
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*/ |
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private static BufferedImage rotateImage(BufferedImage image, double angle) { |
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double rads = Math.toRadians(angle); |
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double sin = Math.abs(Math.sin(rads)); |
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double cos = Math.abs(Math.cos(rads)); |
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int w = image.getWidth(); |
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int h = image.getHeight(); |
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int newWidth = (int) Math.floor(w * cos + h * sin); |
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int newHeight = (int) Math.floor(h * cos + w * sin); |
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BufferedImage rotated = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_ARGB); |
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Graphics2D g2d = rotated.createGraphics(); |
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g2d.translate((newWidth - w) / 2, (newHeight - h) / 2); |
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g2d.rotate(rads, w / 2, h / 2); |
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g2d.drawImage(image, 0, 0, null); |
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g2d.dispose(); |
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return rotated; |
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} |
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/** |
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* 将图片转换为Base64字符串 |
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* @param image 要转换的图片 |
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* @return Base64字符串 |
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*/ |
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private static String convertToBase64(BufferedImage image) { |
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try { |
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ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); |
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ImageIO.write(image, "jpeg", outputStream); |
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byte[] imageBytes = outputStream.toByteArray(); |
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return Base64.getEncoder().encodeToString(imageBytes); |
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} catch (IOException e) { |
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e.printStackTrace(); |
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return null; |
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} |
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} |
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// 使用示例
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public static void main(String[] args) { |
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String sourceImagePath = "C:\\Users\\Administrator\\Desktop\\1.png"; // 源图片路径
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String targetImagePath = "C:\\Users\\Administrator\\Desktop\\2.png"; // 目标图片路径
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double angle = 90; // 旋转角度
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String base64Result = rotateAndOverlayImage(sourceImagePath, targetImagePath, angle); |
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if (base64Result != null) { |
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System.out.println("处理成功，Base64结果：" + base64Result); |
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} else { |
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System.out.println("处理失败"); |
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} |
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} |
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} |
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After Width: | Height: | Size: 13 KiB |
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After Width: | Height: | Size: 12 KiB |
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