[英]Repainting a JPanel slightly moves the image on it
這是我的第一個問題所以如果我做錯了什么請耐心等待。
我正在嘗試創建某種地圖編輯器。 基本上我有一個二維瓷磚陣列,瓷磚有一個地形類型,JPanel為每個瓷磚繪制圖像。 現在,當我單擊一個圖塊時,地形類型會發生變化,JPanel會重新繪制已更改的每個圖塊。
問題是當我點擊一個磁貼時,JPanel上的圖像會以某種方式移動一點。 當我調整窗口大小以便重新繪制每個圖塊時,一切看起來都很好。 但是當我改變一塊瓷磚時,我無法重新繪制所有內容,這種方法非常緩慢。
我不知道哪個代碼示例與此問題相關,但這里是我重寫的paintComponent方法:
@Override
protected void paintComponent(Graphics g)
{
super.paintComponents(g);
Tile[][] tiles = field.getTiles();
for(int i = 0; i < field.getRows(); i++)
for(int j = 0; j < field.getColumns(); j++)
{
if(field.tileHasChanges(i, j))
{
GroundType gt = tiles[i][j].getGround();
g.drawImage(getGroundImage(gt), j*20, i*20, null);
field.handledTileChange(i, j);
}
}
}
而不是繪制圖像,考慮使用GridLayout中保存的JLabel網格作為地圖的網格,然后如果要更改網格單元格的圖像,則只需交換ImageIcons。
例如,要結合我之前的答案和TrashGod的代碼 ,請查看此實現:
import java.awt.Color;
import java.awt.Component;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.util.Random;
import javax.swing.*;
@SuppressWarnings("serial")
public class GridExample extends JPanel {
private Ground[][] groundMap = {
{ Ground.GRASS, Ground.DIRT, Ground.DIRT, Ground.WATER, Ground.WATER,
Ground.WATER, Ground.WATER, Ground.WATER, Ground.WATER,
Ground.WATER, Ground.WATER },
{ Ground.GRASS, Ground.GRASS, Ground.DIRT, Ground.DIRT, Ground.WATER,
Ground.WATER, Ground.WATER, Ground.WATER, Ground.WATER,
Ground.WATER, Ground.WATER },
{ Ground.GRASS, Ground.GRASS, Ground.GRASS, Ground.DIRT, Ground.WATER,
Ground.WATER, Ground.WATER, Ground.WATER, Ground.WATER,
Ground.WATER, Ground.WATER },
{ Ground.GRASS, Ground.GRASS, Ground.GRASS, Ground.DIRT, Ground.DIRT,
Ground.WATER, Ground.WATER, Ground.WATER, Ground.WATER,
Ground.WATER, Ground.WATER },
{ Ground.GRASS, Ground.GRASS, Ground.GRASS, Ground.GRASS, Ground.DIRT,
Ground.WATER, Ground.WATER, Ground.WATER, Ground.WATER,
Ground.WATER, Ground.WATER },
{ Ground.GRASS, Ground.GRASS, Ground.GRASS, Ground.DIRT, Ground.DIRT,
Ground.DIRT, Ground.WATER, Ground.WATER, Ground.WATER,
Ground.WATER, Ground.WATER },
{ Ground.GRASS, Ground.GRASS, Ground.DIRT, Ground.DIRT, Ground.DIRT,
Ground.WATER, Ground.WATER, Ground.WATER, Ground.WATER,
Ground.WATER, Ground.WATER },
{ Ground.GRASS, Ground.GRASS, Ground.GRASS, Ground.DIRT, Ground.DIRT,
Ground.DIRT, Ground.WATER, Ground.WATER, Ground.WATER,
Ground.WATER, Ground.WATER },
{ Ground.GRASS, Ground.GRASS, Ground.GRASS, Ground.GRASS,
Ground.GRASS, Ground.DIRT, Ground.DIRT, Ground.DIRT,
Ground.DIRT, Ground.WATER, Ground.WATER },
{ Ground.GRASS, Ground.GRASS, Ground.GRASS, Ground.GRASS,
Ground.GRASS, Ground.DIRT, Ground.DIRT, Ground.DIRT,
Ground.WATER, Ground.WATER, Ground.WATER },
{ Ground.GRASS, Ground.GRASS, Ground.GRASS, Ground.GRASS,
Ground.GRASS, Ground.GRASS, Ground.DIRT, Ground.DIRT,
Ground.DIRT, Ground.WATER, Ground.WATER }, };
private JLabel[][] labelGrid = new JLabel[groundMap.length][groundMap[0].length];
public GridExample() {
setLayout(new GridLayout(groundMap.length, groundMap[0].length));
for (int r = 0; r < labelGrid.length; r++) {
for (int c = 0; c < labelGrid[r].length; c++) {
labelGrid[r][c] = new JLabel();
labelGrid[r][c].setIcon(groundMap[r][c].getIcon());
add(labelGrid[r][c]);
}
}
addMouseListener(new MyMouseListener());
}
private class MyMouseListener extends MouseAdapter {
@Override
public void mousePressed(MouseEvent mEvt) {
Component comp = getComponentAt(mEvt.getPoint());
for (int row = 0; row < labelGrid.length; row++) {
for (int col = 0; col < labelGrid[row].length; col++) {
if (labelGrid[row][col] == comp) {
Ground ground = groundMap[row][col];
int mapCode = ground.getValue();
mapCode++;
mapCode %= Ground.values().length;
groundMap[row][col] = Ground.values()[mapCode];
labelGrid[row][col].setIcon(groundMap[row][col].getIcon());
}
}
}
}
}
private static void createAndShowGui() {
GridExample mainPanel = new GridExample();
JFrame frame = new JFrame("GridExample");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
enum Ground {
DIRT(0, new Color(205, 133, 63)), GRASS(1, new Color(0, 107, 60)), WATER(2,
new Color(29, 172, 214));
private int value;
private Color color;
private Icon icon;
private Random random = new Random();
private Ground(int value, Color color) {
this.value = value;
this.color = color;
icon = createIcon();
}
private Icon createIcon() {
int width = 24;
BufferedImage img = new BufferedImage(width, width,
BufferedImage.TYPE_INT_ARGB);
for (int row = 0; row < width; row++) {
for (int col = 0; col < width; col++) {
if (random.nextBoolean()) {
img.setRGB(col, row, color.getRGB());
} else {
if (random.nextBoolean()) {
img.setRGB(col, row, color.darker().getRGB());
} else {
img.setRGB(col, row, color.brighter().getRGB());
}
}
}
}
return new ImageIcon(img);
}
public int getValue() {
return value;
}
public Color getColor() {
return color;
}
public Icon getIcon() {
return icon;
}
public static Ground getGround(int value) {
for (Ground ground : Ground.values()) {
if (ground.getValue() == value) {
return ground;
}
}
return null;
}
}
super.paintComponent's'(g);
也許拼寫錯誤導致問題。 你應該調用super.paintComponent(g)
,而不是“s”。
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