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package cn.hutool.core.img;

import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.IORuntimeException;
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.io.resource.Resource;
import cn.hutool.core.lang.Assert;
import cn.hutool.core.util.NumberUtil;
import cn.hutool.core.util.ObjectUtil;
import cn.hutool.core.util.StrUtil;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;
import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.Stroke;
import java.awt.color.ColorSpace;
import java.awt.geom.AffineTransform;
import java.awt.geom.Ellipse2D;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.CropImageFilter;
import java.awt.image.ImageFilter;
import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Serializable;
import java.net.URL;
import java.nio.file.Path;

/**
 * 图像编辑器
 *
 * @author looly
 * @since 4.1.5
 */
public class Img implements Serializable {
	private static final long serialVersionUID = 1L;

	private final BufferedImage srcImage;
	private Image targetImage;
	/**
	 * 目标图片文件格式,用于写出
	 */
	private String targetImageType;
	/**
	 * 计算x,y坐标的时候是否从中心做为原始坐标开始计算
	 */
	private boolean positionBaseCentre = true;
	/**
	 * 图片输出质量,用于压缩
	 */
	private float quality = -1;
	/**
	 * 图片背景色
	 */
	private Color backgroundColor;

	/**
	 * 从Path读取图片并开始处理
	 *
	 * @param imagePath 图片文件路径
	 * @return Img
	 */
	public static Img from(Path imagePath) {
		return from(imagePath.toFile());
	}

	/**
	 * 从文件读取图片并开始处理
	 *
	 * @param imageFile 图片文件
	 * @return Img
	 */
	public static Img from(File imageFile) {
		return new Img(ImgUtil.read(imageFile));
	}

	/**
	 * 从资源对象中读取图片并开始处理
	 *
	 * @param resource 图片资源对象
	 * @return Img
	 * @since 4.4.1
	 */
	public static Img from(Resource resource) {
		return from(resource.getStream());
	}

	/**
	 * 从流读取图片并开始处理
	 *
	 * @param in 图片流
	 * @return Img
	 */
	public static Img from(InputStream in) {
		return new Img(ImgUtil.read(in));
	}

	/**
	 * 从ImageInputStream取图片并开始处理
	 *
	 * @param imageStream 图片流
	 * @return Img
	 */
	public static Img from(ImageInputStream imageStream) {
		return new Img(ImgUtil.read(imageStream));
	}

	/**
	 * 从URL取图片并开始处理
	 *
	 * @param imageUrl 图片URL
	 * @return Img
	 */
	public static Img from(URL imageUrl) {
		return new Img(ImgUtil.read(imageUrl));
	}

	/**
	 * 从Image取图片并开始处理
	 *
	 * @param image 图片
	 * @return Img
	 */
	public static Img from(Image image) {
		return new Img(ImgUtil.toBufferedImage(image));
	}

	/**
	 * 构造,目标图片类型取决于来源图片类型
	 *
	 * @param srcImage 来源图片
	 */
	public Img(BufferedImage srcImage) {
		this(srcImage, null);
	}

	/**
	 * 构造
	 *
	 * @param srcImage        来源图片
	 * @param targetImageType 目标图片类型,null则读取来源图片类型
	 * @since 5.0.7
	 */
	public Img(BufferedImage srcImage, String targetImageType) {
		this.srcImage = srcImage;
		if (null == targetImageType) {
			if (srcImage.getType() == BufferedImage.TYPE_INT_ARGB
					|| srcImage.getType() == BufferedImage.TYPE_INT_ARGB_PRE
					|| srcImage.getType() == BufferedImage.TYPE_4BYTE_ABGR
					|| srcImage.getType() == BufferedImage.TYPE_4BYTE_ABGR_PRE
			) {
				targetImageType = ImgUtil.IMAGE_TYPE_PNG;
			} else {
				targetImageType = ImgUtil.IMAGE_TYPE_JPG;
			}
		}
		this.targetImageType = targetImageType;
	}

	/**
	 * 设置目标图片文件格式,用于写出
	 *
	 * @param imgType 图片格式
	 * @return this
	 * @see ImgUtil#IMAGE_TYPE_JPG
	 * @see ImgUtil#IMAGE_TYPE_PNG
	 */
	public Img setTargetImageType(String imgType) {
		this.targetImageType = imgType;
		return this;
	}

	/**
	 * 计算x,y坐标的时候是否从中心做为原始坐标开始计算
	 *
	 * @param positionBaseCentre 是否从中心做为原始坐标开始计算
	 * @return this
	 * @since 4.1.15
	 */
	public Img setPositionBaseCentre(boolean positionBaseCentre) {
		this.positionBaseCentre = positionBaseCentre;
		return this;
	}

	/**
	 * 设置图片输出质量,数字为0~1(不包括0和1)表示质量压缩比,除此数字外设置表示不压缩
	 *
	 * @param quality 质量,数字为0~1(不包括0和1)表示质量压缩比,除此数字外设置表示不压缩
	 * @return this
	 * @since 4.3.2
	 */
	public Img setQuality(double quality) {
		return setQuality((float) quality);
	}

	/**
	 * 设置图片输出质量,数字为0~1(不包括0和1)表示质量压缩比,除此数字外设置表示不压缩
	 *
	 * @param quality 质量,数字为0~1(不包括0和1)表示质量压缩比,除此数字外设置表示不压缩
	 * @return this
	 * @since 4.3.2
	 */
	public Img setQuality(float quality) {
		if (quality > 0 && quality < 1) {
			this.quality = quality;
		} else {
			this.quality = 1;
		}
		return this;
	}

	/**
	 * 设置图片的背景色
	 *
	 * @param backgroundColor{@link Color} 背景色
	 * @return this
	 */
	public Img setBackgroundColor(Color backgroundColor) {
		this.backgroundColor = backgroundColor;
		return this;
	}

	/**
	 * 缩放图像(按比例缩放)
	 *
	 * @param scale 缩放比例。比例大于1时为放大,小于1大于0为缩小
	 * @return this
	 */
	public Img scale(float scale) {
		if (scale < 0) {
			// 自动修正负数
			scale = -scale;
		}
		final Image srcImg = getValidSrcImg();

		// PNG图片特殊处理
		if (ImgUtil.IMAGE_TYPE_PNG.equals(this.targetImageType)) {
			// 修正float转double导致的精度丢失
			final double scaleDouble = NumberUtil.toDouble(scale);
			this.targetImage = ImgUtil.transform(AffineTransform.getScaleInstance(scaleDouble, scaleDouble),
					ImgUtil.toBufferedImage(srcImg, this.targetImageType));
		} else {
			// 缩放后的图片宽
			final int width = NumberUtil.mul((Number) srcImg.getWidth(null), scale).intValue();
			// 缩放后的图片高
			final int height = NumberUtil.mul((Number) srcImg.getHeight(null), scale).intValue();
			scale(width, height);
		}
		return this;
	}

	/**
	 * 缩放图像(按长宽缩放)
* 注意:目标长宽与原图不成比例会变形 * * @param width 目标宽度 * @param height 目标高度 * @return this */ public Img scale(int width, int height) { return scale(width, height, Image.SCALE_SMOOTH); } /** * 缩放图像(按长宽缩放)
* 注意:目标长宽与原图不成比例会变形 * * @param width 目标宽度 * @param height 目标高度 * @param scaleType 缩放类型,可选{@link Image#SCALE_SMOOTH}平滑模式或{@link Image#SCALE_DEFAULT}默认模式 * @return this * @since 5.7.18 */ public Img scale(int width, int height, int scaleType) { final Image srcImg = getValidSrcImg(); final int srcHeight = srcImg.getHeight(null); final int srcWidth = srcImg.getWidth(null); if (srcHeight == height && srcWidth == width) { // 源与目标长宽一致返回原图 this.targetImage = srcImg; return this; } if (ImgUtil.IMAGE_TYPE_PNG.equals(this.targetImageType)) { // png特殊处理,借助AffineTransform可以实现透明度保留 final double sx = NumberUtil.div(width, srcWidth);// 宽度缩放比 final double sy = NumberUtil.div(height, srcHeight); // 高度缩放比 this.targetImage = ImgUtil.transform(AffineTransform.getScaleInstance(sx, sy), ImgUtil.toBufferedImage(srcImg, this.targetImageType)); } else { this.targetImage = srcImg.getScaledInstance(width, height, scaleType); } return this; } /** * 等比缩放图像,此方法按照按照给定的长宽等比缩放图片,按照长宽缩放比最多的一边等比缩放,空白部分填充背景色
* 缩放后默认为jpeg格式 * * @param width 缩放后的宽度 * @param height 缩放后的高度 * @param fixedColor 比例不对时补充的颜色,不补充为{@code null} * @return this */ public Img scale(int width, int height, Color fixedColor) { Image srcImage = getValidSrcImg(); int srcHeight = srcImage.getHeight(null); int srcWidth = srcImage.getWidth(null); double heightRatio = NumberUtil.div(height, srcHeight); double widthRatio = NumberUtil.div(width, srcWidth); // 浮点数之间的等值判断,基本数据类型不能用==比较,包装数据类型不能用equals来判断。 if (NumberUtil.equals(heightRatio, widthRatio)) { // 长宽都按照相同比例缩放时,返回缩放后的图片 scale(width, height); } else if (widthRatio < heightRatio) { // 宽缩放比例多就按照宽缩放 scale(width, (int) (srcHeight * widthRatio)); } else { // 否则按照高缩放 scale((int) (srcWidth * heightRatio), height); } // 获取缩放后的新的宽和高 srcImage = getValidSrcImg(); srcHeight = srcImage.getHeight(null); srcWidth = srcImage.getWidth(null); final BufferedImage image = new BufferedImage(width, height, getTypeInt()); Graphics2D g = image.createGraphics(); // 设置背景 if (null != fixedColor) { g.setBackground(fixedColor); g.clearRect(0, 0, width, height); } // 在中间贴图 g.drawImage(srcImage, (width - srcWidth) / 2, (height - srcHeight) / 2, srcWidth, srcHeight, fixedColor, null); g.dispose(); this.targetImage = image; return this; } /** * 图像切割(按指定起点坐标和宽高切割) * * @param rectangle 矩形对象,表示矩形区域的x,y,width,height * @return this */ public Img cut(Rectangle rectangle) { final Image srcImage = getValidSrcImg(); fixRectangle(rectangle, srcImage.getWidth(null), srcImage.getHeight(null)); final ImageFilter cropFilter = new CropImageFilter(rectangle.x, rectangle.y, rectangle.width, rectangle.height); this.targetImage = ImgUtil.filter(cropFilter, srcImage); return this; } /** * 图像切割为圆形(按指定起点坐标和半径切割),填充满整个图片(直径取长宽最小值) * * @param x 原图的x坐标起始位置 * @param y 原图的y坐标起始位置 * @return this * @since 4.1.15 */ public Img cut(int x, int y) { return cut(x, y, -1); } /** * 图像切割为圆形(按指定起点坐标和半径切割) * * @param x 原图的x坐标起始位置 * @param y 原图的y坐标起始位置 * @param radius 半径,小于0表示填充满整个图片(直径取长宽最小值) * @return this * @since 4.1.15 */ public Img cut(int x, int y, int radius) { final Image srcImage = getValidSrcImg(); final int width = srcImage.getWidth(null); final int height = srcImage.getHeight(null); // 计算直径 final int diameter = radius > 0 ? radius * 2 : Math.min(width, height); final BufferedImage targetImage = new BufferedImage(diameter, diameter, BufferedImage.TYPE_INT_ARGB); final Graphics2D g = targetImage.createGraphics(); g.setClip(new Ellipse2D.Double(0, 0, diameter, diameter)); if (this.positionBaseCentre) { x = x - width / 2 + diameter / 2; y = y - height / 2 + diameter / 2; } g.drawImage(srcImage, x, y, null); g.dispose(); this.targetImage = targetImage; return this; } /** * 图片圆角处理 * * @param arc 圆角弧度,0~1,为长宽占比 * @return this * @since 4.5.3 */ public Img round(double arc) { final Image srcImage = getValidSrcImg(); final int width = srcImage.getWidth(null); final int height = srcImage.getHeight(null); // 通过弧度占比计算弧度 arc = NumberUtil.mul(arc, Math.min(width, height)); final BufferedImage targetImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); final Graphics2D g2 = targetImage.createGraphics(); g2.setComposite(AlphaComposite.Src); // 抗锯齿 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); g2.fill(new RoundRectangle2D.Double(0, 0, width, height, arc, arc)); g2.setComposite(AlphaComposite.SrcAtop); g2.drawImage(srcImage, 0, 0, null); g2.dispose(); this.targetImage = targetImage; return this; } /** * 彩色转为灰度 * * @return this */ public Img gray() { this.targetImage = ImgUtil.colorConvert(ColorSpace.getInstance(ColorSpace.CS_GRAY), getValidSrcBufferedImg()); return this; } /** * 彩色转为黑白二值化图片 * * @return this */ public Img binary() { this.targetImage = ImgUtil.copyImage(getValidSrcImg(), BufferedImage.TYPE_BYTE_BINARY); return this; } /** * 给图片添加文字水印
* 此方法只在给定位置写出一个水印字符串 * * @param pressText 水印文字 * @param color 水印的字体颜色 * @param font {@link Font} 字体相关信息 * @param x 修正值。 默认在中间,偏移量相对于中间偏移 * @param y 修正值。 默认在中间,偏移量相对于中间偏移 * @param alpha 透明度:alpha 必须是范围 [0.0, 1.0] 之内(包含边界值)的一个浮点数字 * @return 处理后的图像 */ public Img pressText(String pressText, Color color, Font font, int x, int y, float alpha) { return pressText(pressText, color, font, new Point(x, y), alpha); } /** * 给图片添加文字水印
* 此方法只在给定位置写出一个水印字符串 * * @param pressText 水印文字 * @param color 水印的字体颜色 * @param font {@link Font} 字体相关信息 * @param point 绘制字符串的位置坐标 * @param alpha 透明度:alpha 必须是范围 [0.0, 1.0] 之内(包含边界值)的一个浮点数字 * @return 处理后的图像 */ public Img pressText(String pressText, Color color, Font font, Point point, float alpha) { final BufferedImage targetImage = ImgUtil.toBufferedImage(getValidSrcImg(), this.targetImageType); if (null == font) { // 默认字体 font = FontUtil.createSansSerifFont((int) (targetImage.getHeight() * 0.75)); } final Graphics2D g = targetImage.createGraphics(); // 透明度 g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); // 绘制 if (positionBaseCentre) { // 基于中心绘制 GraphicsUtil.drawString(g, pressText, font, color, new Rectangle(point.x, point.y, targetImage.getWidth(), targetImage.getHeight())); } else { // 基于左上角绘制 GraphicsUtil.drawString(g, pressText, font, color, point); } // 收笔 g.dispose(); this.targetImage = targetImage; return this; } /** * 给图片添加全屏文字水印 * * @param pressText 水印文字,文件间的间隔使用尾部添加空格方式实现 * @param color 水印的字体颜色 * @param font {@link Font} 字体相关信息 * @param lineHeight 行高 * @param degree 旋转角度,(单位:弧度),以圆点(0,0)为圆心,正代表顺时针,负代表逆时针 * @param alpha 透明度:alpha 必须是范围 [0.0, 1.0] 之内(包含边界值)的一个浮点数字 * @return 处理后的图像 * @since 5.8.0 */ public Img pressTextFull(String pressText, Color color, Font font, int lineHeight, int degree, float alpha) { final BufferedImage targetImage = ImgUtil.toBufferedImage(getValidSrcImg(), this.targetImageType); if (null == font) { // 默认字体 font = FontUtil.createSansSerifFont((int) (targetImage.getHeight() * 0.75)); } final int targetHeight = targetImage.getHeight(); final int targetWidth = targetImage.getWidth(); // 创建画笔,并设置透明度和角度 final Graphics2D g = targetImage.createGraphics(); g.setColor(color); // 基于图片中心旋转 g.rotate(Math.toRadians(degree), targetWidth >> 1, targetHeight >> 1); g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha)); //获取字符串本身的长宽 Dimension dimension; try { dimension = FontUtil.getDimension(g.getFontMetrics(font), pressText); } catch (Exception e) { // 此处报告bug某些情况下会抛出IndexOutOfBoundsException,在此做容错处理 dimension = new Dimension(targetWidth / 3, targetHeight / 3); } final int intervalHeight = dimension.height * lineHeight; // 在画笔按照画布中心旋转后,达到45度时,上下左右会出现空白区,此处各延申长款的1.5倍实现全覆盖 int y = -targetHeight >> 1; while (y < targetHeight * 1.5) { int x = -targetWidth >> 1; while (x < targetWidth * 1.5) { GraphicsUtil.drawString(g, pressText, font, color, new Point(x, y)); x += dimension.width; } y += intervalHeight; } g.dispose(); this.targetImage = targetImage; return this; } /** * 给图片添加图片水印 * * @param pressImg 水印图片,可以使用{@link ImageIO#read(File)}方法读取文件 * @param x 修正值。 默认在中间,偏移量相对于中间偏移 * @param y 修正值。 默认在中间,偏移量相对于中间偏移 * @param alpha 透明度:alpha 必须是范围 [0.0, 1.0] 之内(包含边界值)的一个浮点数字 * @return this */ public Img pressImage(Image pressImg, int x, int y, float alpha) { final int pressImgWidth = pressImg.getWidth(null); final int pressImgHeight = pressImg.getHeight(null); return pressImage(pressImg, new Rectangle(x, y, pressImgWidth, pressImgHeight), alpha); } /** * 给图片添加图片水印 * * @param pressImg 水印图片,可以使用{@link ImageIO#read(File)}方法读取文件 * @param rectangle 矩形对象,表示矩形区域的x,y,width,height,x,y从背景图片中心计算 * @param alpha 透明度:alpha 必须是范围 [0.0, 1.0] 之内(包含边界值)的一个浮点数字 * @return this * @since 4.1.14 */ public Img pressImage(Image pressImg, Rectangle rectangle, float alpha) { final Image targetImg = getValidSrcImg(); this.targetImage = draw(ImgUtil.toBufferedImage(targetImg, this.targetImageType), pressImg, rectangle, alpha); return this; } /** * 旋转图片为指定角度
* 来自:http://blog.51cto.com/cping1982/130066 * * @param degree 旋转角度 * @return 旋转后的图片 * @since 3.2.2 */ public Img rotate(int degree) { final Image image = getValidSrcImg(); int width = image.getWidth(null); int height = image.getHeight(null); final Rectangle rectangle = calcRotatedSize(width, height, degree); final BufferedImage targetImg = new BufferedImage(rectangle.width, rectangle.height, getTypeInt()); Graphics2D graphics2d = targetImg.createGraphics(); // 抗锯齿 graphics2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR); // 从中心旋转 graphics2d.translate((rectangle.width - width) / 2D, (rectangle.height - height) / 2D); graphics2d.rotate(Math.toRadians(degree), width / 2D, height / 2D); graphics2d.drawImage(image, 0, 0, null); graphics2d.dispose(); this.targetImage = targetImg; return this; } /** * 水平翻转图像 * * @return this */ public Img flip() { final Image image = getValidSrcImg(); int width = image.getWidth(null); int height = image.getHeight(null); final BufferedImage targetImg = new BufferedImage(width, height, getTypeInt()); Graphics2D graphics2d = targetImg.createGraphics(); graphics2d.drawImage(image, 0, 0, width, height, width, 0, 0, height, null); graphics2d.dispose(); this.targetImage = targetImg; return this; } /** * 描边,此方法为向内描边,会覆盖图片相应的位置 * * @param color 描边颜色,默认黑色 * @param width 边框粗细 * @return this * @since 5.4.1 */ public Img stroke(Color color, float width) { return stroke(color, new BasicStroke(width)); } /** * 描边,此方法为向内描边,会覆盖图片相应的位置 * * @param color 描边颜色,默认黑色 * @param stroke 描边属性,包括粗细、线条类型等,见{@link BasicStroke} * @return this * @since 5.4.1 */ public Img stroke(Color color, Stroke stroke) { final BufferedImage image = ImgUtil.toBufferedImage(getValidSrcImg(), this.targetImageType); int width = image.getWidth(null); int height = image.getHeight(null); Graphics2D g = image.createGraphics(); g.setColor(ObjectUtil.defaultIfNull(color, Color.BLACK)); if (null != stroke) { g.setStroke(stroke); } g.drawRect(0, 0, width - 1, height - 1); g.dispose(); this.targetImage = image; return this; } // ----------------------------------------------------------------------------------------------------------------- Write /** * 获取处理过的图片 * * @return 处理过的图片 */ public Image getImg() { return getValidSrcImg(); } /** * 写出图像为结果设置格式
* 结果类型设定见{@link #setTargetImageType(String)} * * @param out 写出到的目标流 * @return 是否成功写出,如果返回false表示未找到合适的Writer * @throws IORuntimeException IO异常 */ public boolean write(OutputStream out) throws IORuntimeException { return write(ImgUtil.getImageOutputStream(out)); } /** * 写出图像为结果设置格式
* 结果类型设定见{@link #setTargetImageType(String)} * * @param targetImageStream 写出到的目标流 * @return 是否成功写出,如果返回false表示未找到合适的Writer * @throws IORuntimeException IO异常 */ public boolean write(ImageOutputStream targetImageStream) throws IORuntimeException { Assert.notBlank(this.targetImageType, "Target image type is blank !"); Assert.notNull(targetImageStream, "Target output stream is null !"); final Image targetImage = (null == this.targetImage) ? this.srcImage : this.targetImage; Assert.notNull(targetImage, "Target image is null !"); return ImgUtil.write(targetImage, this.targetImageType, targetImageStream, this.quality, this.backgroundColor); } /** * 写出图像为目标文件扩展名对应的格式 * * @param targetFile 目标文件 * @return 是否成功写出,如果返回false表示未找到合适的Writer * @throws IORuntimeException IO异常 */ public boolean write(File targetFile) throws IORuntimeException { final String formatName = FileUtil.extName(targetFile); if (StrUtil.isNotBlank(formatName)) { this.targetImageType = formatName; } if (targetFile.exists()) { //noinspection ResultOfMethodCallIgnored targetFile.delete(); } ImageOutputStream out = null; try { out = ImgUtil.getImageOutputStream(targetFile); return write(out); } finally { IoUtil.close(out); } } // ---------------------------------------------------------------------------------------------------------------- Private method start /** * 将图片绘制在背景上 * * @param backgroundImg 背景图片 * @param img 要绘制的图片 * @param rectangle 矩形对象,表示矩形区域的x,y,width,height,x,y从背景图片中心计算(如果positionBaseCentre为true) * @param alpha 透明度:alpha 必须是范围 [0.0, 1.0] 之内(包含边界值)的一个浮点数字 * @return 绘制后的背景 */ private BufferedImage draw(BufferedImage backgroundImg, Image img, Rectangle rectangle, float alpha) { final Graphics2D g = backgroundImg.createGraphics(); GraphicsUtil.setAlpha(g, alpha); fixRectangle(rectangle, backgroundImg.getWidth(), backgroundImg.getHeight()); GraphicsUtil.drawImg(g, img, rectangle); g.dispose(); return backgroundImg; } /** * 获取int类型的图片类型 * * @return 图片类型 * @see BufferedImage#TYPE_INT_ARGB * @see BufferedImage#TYPE_INT_RGB */ private int getTypeInt() { //noinspection SwitchStatementWithTooFewBranches switch (this.targetImageType) { case ImgUtil.IMAGE_TYPE_PNG: return BufferedImage.TYPE_INT_ARGB; default: return BufferedImage.TYPE_INT_RGB; } } /** * 获取有效的源图片,首先检查上一次处理的结果图片,如无则使用用户传入的源图片 * * @return 有效的源图片 */ private Image getValidSrcImg() { return ObjectUtil.defaultIfNull(this.targetImage, this.srcImage); } /** * 获取有效的源{@link BufferedImage}图片,首先检查上一次处理的结果图片,如无则使用用户传入的源图片 * * @return 有效的源图片 * @since 5.7.8 */ private BufferedImage getValidSrcBufferedImg() { return ImgUtil.toBufferedImage(getValidSrcImg(), this.targetImageType); } /** * 修正矩形框位置,如果{@link Img#setPositionBaseCentre(boolean)} 设为{@code true},
* 则坐标修正为基于图形中心,否则基于左上角 * * @param rectangle 矩形 * @param baseWidth 参考宽 * @param baseHeight 参考高 * @return 修正后的{@link Rectangle} * @since 4.1.15 */ private Rectangle fixRectangle(Rectangle rectangle, int baseWidth, int baseHeight) { if (this.positionBaseCentre) { final Point pointBaseCentre = ImgUtil.getPointBaseCentre(rectangle, baseWidth, baseHeight); // 修正图片位置从背景的中心计算 rectangle.setLocation(pointBaseCentre.x, pointBaseCentre.y); } return rectangle; } /** * 计算旋转后的图片尺寸 * * @param width 宽度 * @param height 高度 * @param degree 旋转角度 * @return 计算后目标尺寸 * @since 4.1.20 */ private static Rectangle calcRotatedSize(int width, int height, int degree) { if (degree < 0) { // 负数角度转换为正数角度 degree += 360; } if (degree >= 90) { if (degree / 90 % 2 == 1) { int temp = height; //noinspection SuspiciousNameCombination height = width; width = temp; } degree = degree % 90; } double r = Math.sqrt(height * height + width * width) / 2; double len = 2 * Math.sin(Math.toRadians(degree) / 2) * r; double angel_alpha = (Math.PI - Math.toRadians(degree)) / 2; double angel_dalta_width = Math.atan((double) height / width); double angel_dalta_height = Math.atan((double) width / height); int len_dalta_width = (int) (len * Math.cos(Math.PI - angel_alpha - angel_dalta_width)); int len_dalta_height = (int) (len * Math.cos(Math.PI - angel_alpha - angel_dalta_height)); int des_width = width + len_dalta_width * 2; int des_height = height + len_dalta_height * 2; return new Rectangle(des_width, des_height); } // ---------------------------------------------------------------------------------------------------------------- Private method end }




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