Java 在JPanel中绘制组装的图像
我正在编写一个程序,可以用来在全班同学面前展示主题。虽然MS Powerpoint和类似的程序很不错,但我觉得它们在某些方面有所欠缺。我不是在尝试重新创建这些程序,我只是在尝试制作一个程序,在这个程序中,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黑色窗口,左上角有一个小X,单击该窗口将关闭程序 下面是类文件:Java 在JPanel中绘制组装的图像,java,swing,graphics,bufferedimage,paintcomponent,Java,Swing,Graphics,Bufferedimage,Paintcomponent,我正在编写一个程序,可以用来在全班同学面前展示主题。虽然MS Powerpoint和类似的程序很不错,但我觉得它们在某些方面有所欠缺。我不是在尝试重新创建这些程序,我只是在尝试制作一个程序,在这个程序中,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黑色窗口,左上角有一个小X,单击该窗口将关闭程序 下面是类文件: import java.awt.Color; import java.awt.Graphics; import java.awt.Graphi
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();
}
}
}
导入java.awt.Color;
导入java.awt.Graphics;
导入java.awt.Graphics2D;
导入java.awt.MouseInfo;
导入java.awt.event.MouseEvent;
导入java.awt.event.MouseListener;
导入java.awt.image.buffereImage;
导入java.io.File;
导入java.io.FileNotFoundException;
导入java.io.IOException;
导入java.util.HashMap;
导入java.util.Scanner;
导入javax.imageio.imageio;
导入javax.swing.JFrame;
导入javax.swing.JPanel;
公共班机{
静态JFrame;
静态MyPanel;
静态鼠标侦听器;
静态最终整型字体宽度=6;
静态最终整数字母高度=9;
静态最终整数字母行=10;
静态最终整数=11;
静态最终int-letterNum=110;
静态字符串[]textA={“Hello World,”,
“这是一个测试”,
“我能做什么。”,
“这不是很整洁吗?!”
};
静态int textX=100;
静态int textY=100;
公共静态void main(字符串[]args){
System.out.println(“欢迎来到演示者”);
系统输出打印项次(“开始加载”);
frame=新的JFrame();
panel=新的MyPanel();
侦听器=新的鼠标侦听器(){
公共无效鼠标单击(鼠标事件arg0){
if(arg0.getButton()==MouseEvent.BUTTON1){
//关闭按钮
int x=(int)MouseInfo.getPointerInfo().getLocation().getX();
int y=(int)MouseInfo.getPointerInfo().getLocation().getY();
如果(x>20&&x20&&y正常,这可能需要一些时间
共有10列11行,这些都是错误的方向
static final int letterRow = 10;
static final int letterCol = 11;
我想你不明白gr.drawImage(字母,0,0,letterWidth,letterHeight,letterWidth*y,letterHeight*x,letterWidth*y+letterWidth,letterHeight*x+letterHeight,null);
实际上在做什么,你真正想要的是BuffereImage#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,但正在构建映射,就像它是按列/行顺序一样
而不是
for (int x = 0; x < letterCol; x++) {
for (int y = 0; y < letterRow; y++) {
另外,在每一行中,您都没有使用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
BufferedImage img = iLetters.get(Character.toString(line[j]));
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;
}
}
for(int i=0;i
是的,它可以简化得更多,但步骤很小
可能还有很多其他的东西,但这应该会让你更接近……我认为你不明白什么是
drawImage(图像img,int dx1,int dy1,int dx2,int sx1,int sy1,int sx2,int sy2,ImageObserver)
事实上是这样的你是对的,我不知道。我会去看看。编辑:现在我明白了它的作用。看看BufferedImage#getSubImage
,我想它会做你想做的;)哦,这更干净了,谢谢你,它创建了新的错误。我会尝试解决它们,但现在我不确定这是否解决了我原来的问题。我将drawImage()
更改为lets.getSubimage()
,现在我在线程“main”java.awt.image.RasterFormatException:(x+width)中得到了错误异常位于sun.awt.image.ByteInterleveDraster.createWritableChild(未知源)的光栅外部,位于主$MyPanel的java.awt.image.BuffereImage.getSubimage(未知源)处。(Main.java:117)位于Main.Main(Main.java:43)
,它以前工作过,我要求它打印单个字符。我重新更改了它,现在它可以正常打印。我将查看是否可以获取getSubimage()
要工作,但如果没有,我会坚持其他我更改了很多东西,可能遗漏了一些东西…确保您已正确更新了letterRow
和letterCol
值;)我成功了!现在唯一的问题是文本在右侧和底部被截断我正在使用您的循环。此外,我更改了drawImage()将DrawText改为g.drawImage(textBox,textX,textY,(boxW)*2,(boxH)*2,null);
,这消除了文本扭曲的奇怪方式。编辑:这一更改修复了我的问题
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;
}
}