blu*_*ust 4 java swing jpanel jscrollpane paintcomponent
我正在开发的项目是用于玩桌面游戏的计算机间实用程序,其中一个关键部分是交互式网格/地图.我已经内置了自定义地图创建功能,并希望屏幕能够显示非常大的地图,以及非常小的地图.为此,我创建了一系列类,我可以使用它来显示任何大小的网格.然而,我想要做的是将完成的JPanel放入JScrollPane,从而为地图创造无限空间.当我尝试这样做时,完全显示出JScrollPane的地图根本不会绘制.我怀疑它与Graphics上下文有关,但到目前为止还无法找到解决方案.
在下面的代码中,注释滚动行并在初始化中切换grid.draw方法调用,以查看我希望它看起来像什么.
完整代码如下:
package pac;
import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;
public class MainScreen extends JFrame
{
int width, height, x, y;
Grid grid;
public static void main(String[] args)
{
MainScreen mainScreen = new MainScreen();
mainScreen.setVisible(true);
}
public MainScreen()
{
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
float factor = 1.25f;
width = (int)(dim.width / factor);
height = (int)(dim.height / factor);
x = (int)(dim.width / (factor * 8));
y = (int)(dim.height / (factor * 8));
setBounds(x,y,width,height);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setTitle("DnD Main Screen");
setVisible(true);
grid = new Grid();
JScrollPane scrollPane = new JScrollPane(grid);
scrollPane.setBounds(212,0,650,500);
scrollPane.setViewportView(grid);
add(scrollPane);
this.setLayout(null);
Thread draw = new Thread()
{
public void run()
{
while(true)
{
Graphics g = getGraphics();
grid.repaint();
//grid.paintComponents(getGraphics());
g.setColor(Color.blue);
g.fillRect(0 + 8, 0 + 30, 212, 200);
g.fillRect(863 + 8, 0 + 30, 212, 200);
g.setColor(Color.red);
g.fillRect(0 + 8, 200 + 30, 212, 375);
g.fillRect(863 + 8, 200 + 30, 212, 375);
try {Thread.sleep(1);} catch (InterruptedException e) {e.printStackTrace();}
Thread.yield();
}
}
};
draw.start();
}
public class Grid extends JPanel
{
Tile[][] tiles;
public int x, y, across, down;
public int topBar = 30;
public int skinnyBar = 8;
public Grid()
{
this.setPreferredSize(new Dimension(600,600));
x=212 + skinnyBar;
y=0+topBar;
across = 13;
down = 9;
tiles = new Tile[across][down];
for(int i = 0; i<across; i++)
for(int j = 0; j<down; j++)
{
tiles[i][j] = new Tile(x+(i*50),y+(j*50),50);
}
this.setVisible(true);
}
public void paintComponents(Graphics g)
{
//super.paintComponents(g);
draw(g);
}
public void draw(Graphics g)
{
for(int i = 0; i<across; i++)
for(int j = 0; j<down; j++)
{
g.setColor(Color.black);
for(int k =0; k< 5; k++)
g.drawRect(tiles[i][j].x+k, tiles[i][j].y+k, tiles[i][j].side-k*2, tiles[i][j].side-2*k);
}
}
private class Tile
{
int x, y, side;
public Tile(int inX, int inY, int inSide)
{
x=inX;
y=inY;
side=inSide;
}
}
}
}
我一直在研究这个问题,但是找不到与我相似的问题和找不到的问题.有什么建议？谢谢,麻烦您了.
1.不要使用null布局JScrollPane,使用一些标准LayoutManager,
2.不使用getGraphics(),此方法用于打印到打印机或将GUI保存为文件图像的快照
3.没有理由使用draw(),准备好所有内容Objects并将所有内容都画在里面paintComponent()
4.大多数例子太旧,基于Thread,不使用Thread,Swing Timer反而使用
最简单的方法
JFrame- > JScrollPane- > JPanel- >通过使用GridLayout放在那里所需的量JPanels与期望的Color,把这些JPanels向某些类型的数组,并通过使用Swing Timer拾取JPanel从阵列和改变其Backgroung
例如,必须添加Swing Timerpaiting期间
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.*;
public class TilePainter extends JPanel implements Scrollable {
private static final long serialVersionUID = 1L;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame("Tiles");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(new JScrollPane(new TilePainter()));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
private final int TILE_SIZE = 50;
private final int TILE_COUNT = 100;
private final int visibleTiles = 10;
private final boolean[][] loaded;
private final boolean[][] loading;
private final Random random;
public TilePainter() {
setPreferredSize(new Dimension(TILE_SIZE * TILE_COUNT, TILE_SIZE * TILE_COUNT));
loaded = new boolean[TILE_COUNT][TILE_COUNT];
loading = new boolean[TILE_COUNT][TILE_COUNT];
random = new Random();
}
public boolean getTile(final int x, final int y) {
boolean canPaint = loaded[x][y];
if (!canPaint && !loading[x][y]) {
loading[x][y] = true;
Timer timer = new Timer(random.nextInt(500),
new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
loaded[x][y] = true;
repaint(x * TILE_SIZE, y * TILE_SIZE, TILE_SIZE, TILE_SIZE);
}
});
timer.setRepeats(false);
timer.start();
}
return canPaint;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Rectangle clip = g.getClipBounds();
int startX = clip.x - (clip.x % TILE_SIZE);
int startY = clip.y - (clip.y % TILE_SIZE);
for (int x = startX; x < clip.x + clip.width; x += TILE_SIZE) {
for (int y = startY; y < clip.y + clip.height; y += TILE_SIZE) {
if (getTile(x / TILE_SIZE, y / TILE_SIZE)) {
g.setColor(Color.GREEN);
} else {
g.setColor(Color.RED);
}
g.fillRect(x, y, TILE_SIZE - 1, TILE_SIZE - 1);
}
}
}
@Override
public Dimension getPreferredScrollableViewportSize() {
return new Dimension(visibleTiles * TILE_SIZE, visibleTiles * TILE_SIZE);
}
@Override
public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) {
return TILE_SIZE * Math.max(1, visibleTiles - 1);
}
@Override
public boolean getScrollableTracksViewportHeight() {
return false;
}
@Override
public boolean getScrollableTracksViewportWidth() {
return false;
}
@Override
public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) {
return TILE_SIZE;
}
}
你确定吗？
public void paintComponents(Graphics g)
你的意思是相反
public void paintComponent(Graphics g)