Question

我无法在我编写的绘画方法上插入图像。我希望图像在某些坐标处与paint方法重叠。

我的代码：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Polygon;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class testguipaint {

    public static void main(String[] args) {
        testguipaint img = new testguipaint();
    }   
    public testguipaint() {
        JFrame frame = new JFrame();
        frame.add(crafting, BorderLayout.CENTER);
        frame.setSize(442, 284);
        frame.setLocationRelativeTo(null);
        frame.setResizable(false);
        frame.setVisible(true);
        frame.setDefaultCloseOperation(3);
    }

    static JPanel crafting = new JPanel() {
        public void paint(Graphics g) {
            Color darkGrey = new Color(153, 153, 153);
            g.setColor(darkGrey);
            g.fillRect(0, 0, 436, 252);
            Color lightGrey = new Color(198, 198, 198);
            g.setColor(lightGrey);
            g.fill3DRect(3, 3, 430, 246, true);
            g.setColor(darkGrey);
            g.fill3DRect(16, 16, 222, 222, true);
            g.fill3DRect(320, 78, 100, 100, true);
            g.fillRect(248, 121, 39, 12);
            Polygon triangle = new Polygon();
            triangle.addPoint(287, 103);
            triangle.addPoint(287, 151);
            triangle.addPoint(311, 127);
            g.fillPolygon(triangle);
            g.setColor(Color.white);
            g.fill3DRect(88, 16, 3, 222, true);
            g.fill3DRect(163, 16, 3, 222, true);
            g.fill3DRect(16, 88, 222, 3, true);
            g.fill3DRect(16, 163, 222, 3, true);
            //BufferedImage image = new ImageIO.read(new File("/minecraft jpeg's/Products/Bread.png"));
            //g.drawImage(image, 44, 191, null);
            //44, 191
        }
    };      
}

Answer 1

只是一个建议，在paint组件中最后绘制图像。这将允许通过在其他对象之上绘制图像。另外，我知道你可能只是测试一些东西，但是你班级名字中每个单词的第一个字母应该大写。

Answer 2

不是如何叠加或重叠的答案

1）testguipaint应该TestGuiPaint更多关于Java命名约定here或here

2）Swing GUI相关代码应该包含在invokeLater()中，更多关于Initial Threads

3）在Swing JComponents中绘画有方法paintComponent()而不是paint()方法，更多关于2D Graphics

Answer 3

此处仅为短代码压缩导入，仅实现MKorbel提出的2个建议（1和3），为了简洁而扩展JFrame，从main中删除了实例，这是从未使用过的。没有你要求的。

但是，每次面板需要重新绘制时，您肯定不希望从HDD中反复读取图像。所以我们创建一个包含属性的实例，即图像。

import java.awt.*;
import javax.swing.*;
import javax.swing.JPanel;
import java.awt.image.*;
import javax.imageio.*;
import java.io.*;

public class TestGuiPaint extends JFrame {

    public static void main (String [] args) {
        new TestGuiPaint ();
    }   
    public TestGuiPaint () {
    super ("TestGuiPaint"); 
        add (new CraftingPanel (), BorderLayout.CENTER);
        setSize (442, 284);
        setLocationRelativeTo (null);
        setResizable (false);
        setVisible (true);
        setDefaultCloseOperation (3);
    }

    class CraftingPanel extends JPanel {
    BufferedImage image = null;
        public CraftingPanel () {
        try {
            image = ImageIO.read (new File ("./maeander3.png"));
        } catch (java.io.IOException ioe) 
        {
            System.err.println (ioe.getMessage ());
        }       
        }

        public void paintComponent (Graphics g) {
            Color darkGrey = new Color (153, 153, 153);
            g.setColor (darkGrey);
            g.fillRect (0, 0, 436, 252);
            Color lightGrey = new Color (198, 198, 198);
            g.setColor (lightGrey);
            g.fill3DRect (3, 3, 430, 246, true);
            g.setColor (darkGrey);
            g.fill3DRect (16, 16, 222, 222, true);
            g.fill3DRect (320, 78, 100, 100, true);
            g.fillRect (248, 121, 39, 12);
            Polygon triangle = new Polygon ();
            triangle.addPoint (287, 103);
            triangle.addPoint (287, 151);
            triangle.addPoint (311, 127);
            g.fillPolygon (triangle);
            g.setColor (Color.white);
            g.fill3DRect (88, 16, 3, 222, true);
            g.fill3DRect (163, 16, 3, 222, true);
            g.fill3DRect (16, 88, 222, 3, true);
            g.fill3DRect (16, 163, 222, 3, true);
        g.drawImage (image, 44, 191, null);
        }
    };      
}

我希望你明白我为图片选择了不同的文件名。 :)

如何在JPanel（在JPanel中）绘制方法上添加图像？

3 个答案: