我正在开发一个程序，可以用来在课堂前介绍主题。虽然MS Powerpoint和类似程序很好，但我感觉在某些方面缺少它们。我不是在尝试重新创建这些程序，而只是在尝试创建一个程序，可以在其中将文本键入String数组，添加图像并将它们全部放置在屏幕上。
目前，我的程序打开了一个全屏暗窗口，在左上角有一个小X，单击该窗口将关闭程序。
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();
}
}
}
运行它所需的其余文件在这里http://www.mediafire.com/?jq8vi4dm3t4b6
2个PNG和1个文本文件。
该程序运行正常，没有错误。唯一的问题是drawTexts（）方法。调用该方法时，文本行不应出现在屏幕上的任何位置，而应以文件中字母大小的2倍出现在（100，100）处。
自从我做图形以来已经有一段时间了。我记得需要在某个地方调用repaint（），但是我不记得在这里是否需要它，如果需要的话，它在哪里。
最佳答案
好吧，这可能需要一些时间...
一共有10列和11行，这些都绕错了方向...
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/列顺序读取
Letters.png文件，但是就像按列/行顺序一样构建映射...代替...
for (int x = 0; x < letterCol; x++) {
for (int y = 0; y < letterRow; y++) {
您应该使用...
for (int y = 0; y < letterRow; y++) {
for (int x = 0; x < letterCol; x++) {
lightbulb Scanner不会读取文件...我不经常使用Scanner，但是当我将其更改为lightbulb = new Scanner(new BufferedReader(new FileReader("letters.txt")));时，它可以工作...在您的
makeTextBox方法中，您尝试使用char而不是String检索图像，这意味着查找失败，因为两个键不兼容。您需要使用更多类似...BufferedImage img = iLetters.get(Character.toString(line[j]));
另外，在每一行中，您都没有保留
drawX变量，因此文本一直在运行……事实上，我只是重新编写了循环，使其看起来更像...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，可以进一步简化，但只需很少的步骤...
可能还有很多其他事情，但这应该使您更接近……