海报绘制 - Java 贴图 - Java 图片绘制工具类
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package tools.io;
import lombok.AllArgsConstructor;
import lombok.Getter;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.Ellipse2D;
import java.awt.image.BufferedImage;
import java.io.*;
import java.net.URL;
import java.util.Objects;
/** * @author Created by 谭健 on 2021/1/11. 星期一. 17:43.
* © All Rights Reserved.
*/
public class CustomSketchpadUtils {
/** * 图片坐标
*/
@Getter
private static class ImagePosition {
private final int x;
private final int y;
private final BufferedImage bufferedImage;
private int width;
private int height;
public ImagePosition(int x, int y, BufferedImage bufferedImage) {
this.x = x;
this.y = y;
this.bufferedImage = bufferedImage;
}
/** * 设置图片绘制为原样绘制
*/
public ImagePosition withDefaultHeightAndWidth() {
this.width = bufferedImage.getWidth();
this.height = bufferedImage.getHeight();
return this;
}
/** * 绘制图片为自定义大小绘制
*/
public ImagePosition withResetHeightAndWidth(int width, int height) {
this.width = width;
this.height = height;
return this;
}
}
/** * 创建一个图片坐标
* * @param x x
* @param y y
* @param bufferedImage 图片
* @return
*/
public static ImagePosition createImagePosition(int x, int y, BufferedImage bufferedImage) {
return new ImagePosition(x, y, bufferedImage);
}
/** * 文字坐标
*/
@AllArgsConstructor
@Getter
private static class TextPosition {
private int x;
private final int y;
private final Color color;
private final Font font;
private String text;
/** * @param max 最大文字数量
* @return
*/
public TextPosition maxLength(int max) {
int length = text.length();
if (max < length) {
this.text = this.text.substring(0, max);
}
return this;
}
public TextPosition center(int canvasWidth) {
this.x = canvasWidth / 2 - this.text.length() * 9;
return this;
}
}
/** * 创建一个文字坐标
* * @param x x
* @param y y
* @param text 文本
* @param color 颜色
* @param font 字体
* @return
*/
public static TextPosition createTextPosition(int x, int y, Color color, Font font, String text) {
return new TextPosition(x, y, color, font, text);
}
/** * 读取图片到缓冲
* * @param imgUrl 背景地址
*/
public static BufferedImage readImg(String imgUrl) {
try {
return ImageIO.read(new URL(imgUrl));
} catch (IOException e) {
e.printStackTrace();
}
throw new NullPointerException("图片读取失败");
}
/** * 创建指定大小的画布
* * @param width 宽度
* @param height 高度
* @return
*/
public static BufferedImage createCanvas(int width, int height) {
return new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
}
/** * 创建一个带背景的画布(平铺模式)
* * @param url 图片地址
* @return
*/
public static BufferedImage createCanvas(String url) {
BufferedImage background = readImg(url);
BufferedImage canvas = new BufferedImage(background.getWidth(), background.getHeight(), BufferedImage.TYPE_4BYTE_ABGR);
drawImage((Graphics2D) canvas.getGraphics(), createImagePosition(0, 0, background).withDefaultHeightAndWidth());
return canvas;
}
/** * 创建一个带背景的画布(圆角平铺模式)
* * @param url 图片地址
* @return
*/
public static BufferedImage createFilletCanvas(String url) {
BufferedImage background = readImg(url);
int width = background.getWidth();
int height = background.getHeight();
// 透明底的图片
BufferedImage canvas = new BufferedImage(width, height, BufferedImage.TYPE_4BYTE_ABGR);
setFillet(background, width, height, canvas);
return canvas;
}
public static void setFillet(BufferedImage background, int width, int height, BufferedImage canvas) {
Graphics2D graphics2D = canvas.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
int border = 1;
int resetWidth = width - border * 2;
int resetHeight = height - border * 2;
Ellipse2D.Double shape = new Ellipse2D.Double(border, border, resetWidth, resetHeight);
graphics2D.setClip(shape);
drawImage(graphics2D, createImagePosition(border, border, background).withResetHeightAndWidth(resetWidth, resetHeight));
graphics2D.dispose();
graphics2D = canvas.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
border = 4;
Stroke s = new BasicStroke(1.5F, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
graphics2D.setStroke(s);
graphics2D.setColor(Color.WHITE);
graphics2D.drawOval(border, border, width - border * 2, width - border * 2);
graphics2D.dispose();
}
/** * 绘制一个文本
* * @param graphics2D 画板
* @param text 文字坐标
*/
public static void drawString(Graphics2D graphics2D, TextPosition text) {
graphics2D.setColor(text.getColor());
graphics2D.setFont(text.getFont());
graphics2D.drawString(text.getText(), text.getX(), text.getY());
}
/** * 绘制一个图片
* * @param graphics2D 画板
* @param image 图片
*/
@SuppressWarnings("all")
public static void drawImage(Graphics2D graphics2D, ImagePosition image) {
BufferedImage bufferedImage = image.getBufferedImage();
if (Objects.isNull(image.getWidth()) || Objects.isNull(image.getHeight())) {
image.withDefaultHeightAndWidth();
}
Image scaledInstance = bufferedImage.getScaledInstance(image.getWidth(), image.getHeight(), Image.SCALE_DEFAULT);
graphics2D.drawImage(scaledInstance, image.getX(), image.getY(), null);
}
private static InputStream write2InputStream(BufferedImage canvas) {
ByteArrayOutputStream os = new ByteArrayOutputStream();
try {
ImageIO.write(canvas, "png", os);
} catch (IOException e) {
e.printStackTrace();
}
return new ByteArrayInputStream(os.toByteArray());
}
public static void write2Localhost(BufferedImage canvas, String path) {
try {
ImageIO.write(canvas, "png", new FileOutputStream(path));
} catch (IOException e) {
e.printStackTrace();
}
}
}
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