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cn.hutool.core.img.Img Maven / Gradle / Ivy
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.*;
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.*;
import java.net.URL;
import java.nio.file.Path;
/**
* 图像编辑器
*
* @author looly
* @since 4.1.5
*/
public class Img implements Flushable, 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.castToBufferedImage(image, ImgUtil.IMAGE_TYPE_JPG));
}
/**
* 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);
}
}
@Override
public void flush() {
ImgUtil.flush(this.srcImage);
ImgUtil.flush(this.targetImage);
}
// ---------------------------------------------------------------------------------------------------------------- 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
}