9

好吧，所以我正在制作一个游戏，我正在尝试通过在其上添加文本来修改原始命中标记图像，并且我正在使用以下代码：

import javax.swing.ImageIcon;
import javax.swing.Timer;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
public class HitMarker {

    public static final Image rangeHitMarker = new ImageIcon(HitMarker.class.getResource("rangeHitMarker.png")).getImage();
    public static final Image magicHitMarker = new ImageIcon(HitMarker.class.getResource("magicHitMarker.png")).getImage();
    public static final Image monsterHitMarker = new ImageIcon(HitMarker.class.getResource("monsterHitMarker.png")).getImage();

    public static final Font font = new Font("Tahoma", Font.PLAIN, 10);

    public static final Color t = new Color(0,0,0,0);

    public Image hitMarker;
    public BufferedImage image;
    public String hit;

    public int attackStyle;

    public boolean rangeAttack;
    public int x;
    public int y;

    public Timer timer;
    public boolean remove;

    public HitMarker(int x, int y, int hit, int attackStyle){
        this.hit = String.format("%d", hit);
        this.remove = false;
        this.x = x;
        this.y = y;
        this.attackStyle = attackStyle;
        this.hitMarker = getImage();
        BufferedImage bi = new BufferedImage(35, 20, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bi.createGraphics();
        g.drawImage(hitMarker, 0, 0, null);
        g.setFont(font);
        g.setColor(Color.WHITE);
        g.drawString(this.hit, 18, 13);
        g.dispose();
        image = bi;
        timer = new Timer(800,
                new ActionListener(){
            public void actionPerformed(ActionEvent e){
                remove = true;
                timer.stop();
            }
        }
        );
        timer.setInitialDelay(800);
        timer.start();
    }

    public HitMarker(int x, int y, int hit){
        this.hit = String.format("%d", hit);
        this.remove = false;
        this.x = x;
        this.y = y;
        this.hitMarker = monsterHitMarker;
        BufferedImage bi = new BufferedImage(35, 20, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bi.createGraphics();
        g.drawImage(hitMarker, 0, 0, null);
        g.setFont(font);
        g.setColor(Color.WHITE);
        g.drawString(this.hit, 18, 13);
        g.dispose();
        image = bi;
        timer = new Timer(800,
                new ActionListener(){
            public void actionPerformed(ActionEvent e){
                remove = true;
                timer.stop();
            }
        }
        );
        timer.setInitialDelay(800);
        timer.start();
    }

    public boolean isRangeAttack(){
        return attackStyle == AttackStyleConstants.RANGE || attackStyle == AttackStyleConstants.RANGE_DEFENCE ? true : false;
    }

    public Image getImage(){
        return isRangeAttack() ? rangeHitMarker : magicHitMarker;
    }

}

特别关注任一构造函数：我遇到的错误是，当我创建 BufferedImage 并在缓冲图像上绘制图像时，它会自动创建黑色背景，我不知道为什么。我已经尝试研究这个主题，有人说要更改 AlphaComposite 和 g.clearRect() 方法的一些内容，但这些似乎都不起作用。顺便说一句，我在缓冲图像上绘制的图像是 35x20（这是缓冲图像的尺寸）并且它具有透明背景。如果有人能告诉我如何删除这个黑色背景，将不胜感激，谢谢。

4

4 回答 4

19

试试BufferedImage.TYPE_INT_ARGB。这将使区域透明而不是黑色。

于 2012-06-29T16:12:35.893 回答
4

您可能还想尝试存储 Alpha 通道，

 BufferedImage bi = new BufferedImage(35, 20, BufferedImage.TYPE_INT_ARGB);
于 2012-06-29T16:13:44.267 回答
1

如果你需要一个JPG白色背景，你需要像这样绘制图像：

g.drawImage(hitMarker, 0, 0, Color.WHITE, null);

这样，您可以在从PNG到时避免黑色背景JPG。

于 2016-02-18T01:45:05.460 回答
0

使用 png 而不是 jpeg。Png 非常适合透明度操作。这是简单的 png 导出代码片段；

        BufferedImage bImage = new BufferedImage(640, 480, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2d = (Graphics2D) bImage.getGraphics();
        DrawingContext context = new DrawingContext(g2d);
        plot.draw(context);
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DrawableWriter wr = DrawableWriterFactory.getInstance().get("image/png");

        wr.write(plot, baos, 640, 480);
        baos.flush();

        baos.close();
        InputStream inputStream = new ByteArrayInputStream(baos.toByteArray());
        BufferedImage bufferedImage =  ImageIO.read(inputStream);

        ImageIO.write(bufferedImage,"png",new File(outputFolder.getPath()+"/result.png"));
于 2015-05-26T11:03:33.893 回答