Java基础 awt Graphics2D 生成矩形图片并向内写入字符串

时间：2023-03-10 01:26:00
Java基础 awt Graphics2D 生成矩形图片并向内写入字符串
  •     JDK ：OpenJDK-11
  •      OS ：CentOS 7.6.1810
  •      IDE ：Eclipse 2019‑03
  • typesetting ：Markdown

 

code

package per.jizuiku.gui;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import javax.imageio.ImageIO;

/**

 * @author 给最苦

 * @date 2019/06/30

 * @blog www.cnblogs.com/jizuiku

 */

public class Demo {

    /**

     *

     * @param args

     * @throws FileNotFoundException

     * @throws IOException

     */

    public static void main(String[] args) throws FileNotFoundException, IOException {

        // 得到图片缓冲区

        int width = 100;

        int height = 50;

        int imageType = BufferedImage.TYPE_INT_BGR;

        BufferedImage myImage = new BufferedImage(width, height, imageType);

        // 得到画笔

        Graphics2D pen = (Graphics2D)myImage.getGraphics();

        // 设置笔的颜色,即背景色

        pen.setColor(Color.WHITE);

        // 画出一个矩形

        // 坐标x 坐标y 宽度100 长度50

        pen.fillRect(0, 0, 100, 50);

        // monospace 粗体显示 大小12

        Font font = new Font("monospace", Font.BOLD, 25);

        pen.setFont(font);

        // 字的颜色 和 背景的颜色 要不同的

        pen.setColor(Color.blue);

        // 写字

        pen.drawString("abcd", 20, 35);

        ImageIO.write(myImage, "JPEG", new FileOutputStream("abcd.jpg"));

    }

}

 

result

Java基础 awt Graphics2D 生成矩形图片并向内写入字符串

 

sourceCode

/**

    * Renders the text of the specified {@code String}, using the

    * current text attribute state in the {@code Graphics2D} context.

    * The baseline of the

    * first character is at position (<i>x</i>,&nbsp;<i>y</i>) in

    * the User Space.

    * The rendering attributes applied include the {@code Clip},

    * {@code Transform}, {@code Paint}, {@code Font} and

    * {@code Composite} attributes.  For characters in script

    * systems such as Hebrew and Arabic, the glyphs can be rendered from

    * right to left, in which case the coordinate supplied is the

    * location of the leftmost character on the baseline.

    * @param str the string to be rendered

    * @param x the x coordinate of the location where the

    * {@code String} should be rendered

    * @param y the y coordinate of the location where the

    * {@code String} should be rendered

    * @throws NullPointerException if {@code str} is

    *         {@code null}

    * @see         java.awt.Graphics#drawBytes

    * @see         java.awt.Graphics#drawChars

    * @since       1.0

    */

public abstract void drawString(String str, int x, int y);

 

resource

  • [ JDK ] openjdk.java.net
  • [ doc - 参考 ] docs.oracle.com/en/java/javase/11
  • [ 规范 - 推荐 ] yq.aliyun.com/articles/69327
  • [ 规范 - 推荐 ] google.github.io/styleguide
  • [ 源码 ] hg.openjdk.java.net
  • [ OS ] www.centos.org
  • [ IDE ] www.eclipse.org/downloads/packages
  • [ 平台 ] www.cnblogs.com

 

感谢帮助过 给最苦 的人们。

Java、Groovy和Scala等基于JVM的语言，优秀，值得学习。

规范的命名和代码格式等，有助于沟通和理解。

JVM的配置、监控与优化，比较实用，值得学习。

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