Question

我正在制作一个程序，我可以用来在课堂前提出主题。虽然MS Powerpoint和类似的程序很好，但我觉得他们在某些方面缺乏。我不是要重新创建这些程序，我只是尝试创建一个程序，我可以将文本键入字符串数组，添加图像，并将它们全部放在屏幕上。

目前我的程序打开一个全屏暗窗口，左上角有一个小X，点击后会关闭程序。

这是类文件：

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.MouseInfo;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.HashMap;
import java.util.Scanner;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;


public class Main {

    static JFrame frame;
    static MyPanel panel;
    static MouseListener listener;

    static final int letterWidth = 6;
    static final int letterHeight = 9;
    static final int letterRow = 10;
    static final int letterCol = 11;
    static final int letterNum = 110;

    static String[] textA = {"Hello World,",
                "Here is a test",
                "of what I can do.",
                "Isn't it neat?!"
                };
    static int textX = 100;
        static int textY = 100;

    public static void main(String[] args){
        System.out.println("Welcome to Presenter");
        System.out.println("Beginning loading");
        frame = new JFrame();
        panel = new MyPanel();

        listener = new MouseListener(){
            public void mouseClicked(MouseEvent arg0) {
                if(arg0.getButton() ==MouseEvent.BUTTON1){

                        //Close button
                    int x = (int) MouseInfo.getPointerInfo().getLocation().getX();
                        int y = (int) MouseInfo.getPointerInfo().getLocation().getY();
                    if(x>20 && x<48 && y>20 && y<56){
                        frame.dispose();
                            System.exit(0);
                    }


                }
             }

            public void mouseEntered(MouseEvent arg0) {}

            public void mouseExited(MouseEvent arg0) {}

            public void mousePressed(MouseEvent arg0) {}

            public void mouseReleased(MouseEvent arg0) {}
        };


        frame.setUndecorated(true);
        frame.setVisible(true);
        frame.setExtendedState(JFrame.MAXIMIZED_BOTH); 
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setFocusable(true);
        frame.add(panel);
            frame.addMouseListener(listener);
            System.out.println("");
        System.out.println("Loading Complete");
    }



public static class MyPanel extends JPanel{
    private static final long serialVersionUID = 1L;

    HashMap<String, BufferedImage> iLetters;
    static BufferedImage exitButton = new BufferedImage(28, 36, BufferedImage.TYPE_INT_ARGB);
    static BufferedImage letters = new BufferedImage(120, 198, BufferedImage.TYPE_INT_ARGB);
    Scanner lightbulb;
    static boolean point = false;
    int x;
    int y;
    BufferedImage textBox;
    int boxW, boxH;

    public MyPanel(){
        //pictures
        File a = new File("Exit.png");
        try { exitButton = ImageIO.read(a); } catch (IOException e) {e.printStackTrace();}
        a = new File("Letters.png");
        try { letters = ImageIO.read(a); } catch (IOException e) {e.printStackTrace();}
        //letter index
        try { lightbulb = new Scanner(new File("letters.txt")); } catch (FileNotFoundException e) {e.printStackTrace();}

        System.out.println("Files Read");



        //create letters
        System.out.println("Beginning tiling");
        iLetters = new HashMap<String, BufferedImage>();
        BufferedImage[] pics = new BufferedImage[letterNum];
        int count = 0;
        for(int x=0; x<letterCol; x++){
            for(int y=0; y<letterRow; y++){
                pics[count] = new BufferedImage(letterWidth, letterHeight, BufferedImage.TYPE_INT_ARGB);

                Graphics2D gr = pics[count++].createGraphics();
                gr.drawImage(letters, 0, 0, letterWidth, letterHeight, letterWidth * y, letterHeight * x, letterWidth * y + letterWidth, letterHeight * x + letterHeight, null);
                gr.dispose();
            }
            System.out.println("Row " + x + " tiled.");
        }
        System.out.println("Completed Tiling");

        System.out.println("Beginning indexing");
        int loc = 0;
        String key = "";
        while(lightbulb.hasNext()){
            loc = lightbulb.nextInt()-1;
            key = lightbulb.next();
            iLetters.put(key, pics[loc]);
        }
        System.out.println("Indexing Complete");

        System.out.println("Making Text Boxes");
        makeTextBox(textA);

        System.out.println("Text Boxes Made");

    }

    public void paintComponent(Graphics g){
        super.paintComponent(g);
        this.setBackground(new Color(0, 0, 10));
        g.drawImage(exitButton, 20, 20, null);
//          g.drawImage(iLetters.get("A"), 100, 100, null);
        drawTexts(g);
    }

    public void drawTexts(Graphics g){
        g.drawImage(textBox, textX, textY, textX+(boxW*2), textY+(boxH*2), null);
    }

    public int findLongest(String[] text){
        int longest = 0;
        for(int i=0; i<text.length; i++){
            if(text[i].length() > longest)
            longest = text[i].length();
        }
        return longest;
    }

    public void makeTextBox(String[] text){
        int longest = findLongest(text);
        boxW = (longest*6)+(longest-1);
        boxH = (text.length*9)+(text.length-1);
        textBox = new BufferedImage(boxW, boxH, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2d = textBox.createGraphics();
        char[] line;
        int drawX = 0;
        int drawY = 0;


        for(int i=0; i<text.length; i++){
            line = text[i].toCharArray();
            for(int j=0; j<line.length; j++){
                if(j<line.length-1){
                    g2d.drawImage(iLetters.get(line[j]), drawX, drawY, null);
                    drawX += letterWidth + 1;
                }
                else{
                    g2d.drawImage(iLetters.get(line[j]), drawX, drawY, null);
                }
            }
            if(i<text.length-1){
                drawY += letterHeight + 1;
            }
            else{
                drawY += letterHeight;
            }
        }
        g2d.dispose();
    }






}

}

运行所需的其余文件位于http://www.mediafire.com/?jq8vi4dm3t4b6

2个PNG和1个文本文件。

程序运行正常，没有错误。唯一的问题是drawTexts（）方法。当调用该方法时，文本行不会出现在屏幕上的任何位置，它们应该以（100,100）出现，大小是文件中字母大小的2倍。

我做了图片已经有一段时间了。我记得需要在某个地方调用repaint（），但我不记得我是否需要它，如果我这样做，它会去哪里。

Answer 1

好的，这可能需要一些时间......

Letters

有10列和11行，这些都是错误的方式......

static final int letterRow = 10;
static final int letterCol = 11;

我认为您不了解gr.drawImage(letters, 0, 0, letterWidth, letterHeight, letterWidth * y, letterHeight * x, letterWidth * y + letterWidth, letterHeight * x + letterHeight, null);实际上在做什么，您真正想要的是BufferedImage#getSubImage ......

BufferedImage subimage = letters.getSubimage(letterWidth * x, letterHeight * y, letterWidth, letterHeight);

您正在按行/列顺序阅读Letters.png文件，但是将映射构建为列/行顺序...

而不是......

for (int x = 0; x < letterCol; x++) {
    for (int y = 0; y < letterRow; y++) {

你应该使用......

for (int y = 0; y < letterRow; y++) {
    for (int x = 0; x < letterCol; x++) {

lightbulb Scanner没有读取文件...我不经常使用Scanner，但当我将其更改为lightbulb = new Scanner(new BufferedReader(new FileReader("letters.txt")));时...

在makeTextBox方法中，您尝试使用char而非String检索图像，这意味着查找失败，因为两个密钥不兼容。你需要使用更像......的东西。

BufferedImage img = iLetters.get(Character.toString(line[j]));

另外，在每一个新行上，你都没有放置drawX变量，所以文本只是不断运行......事实上，我只是重新编写循环看起来更像...... / p>

for (int i = 0; i < text.length; i++) {
    line = text[i].toCharArray();
    for (int j = 0; j < line.length; j++) {
        BufferedImage img = iLetters.get(Character.toString(line[j]));
        g2d.drawImage(img, drawX, drawY, null);
        if (j < line.length - 1) {
            drawX += letterWidth + 1;
        }
    }
    drawX = 0;
    if (i < text.length - 1) {
        drawY += letterHeight + 1;
    } else {
        drawY += letterHeight;
    }
}

是的，它可以简化得更多，但步骤很少......

可能还有很多其他的东西，但这应该让你更近一步......

将组合图像绘制到JPanel

1 个答案: