[英]Why are the images not being displayed?
包主;
import java.awt.Color;
import java.awt.DisplayMode;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
public class ImageTest extends JFrame {
public static void main(String[] args) {
DisplayMode displayMode;
if (args.length == 3) {
displayMode = new DisplayMode(Integer.parseInt(args[0]),
Integer.parseInt(args[1]), Integer.parseInt(args[2]),
DisplayMode.REFRESH_RATE_UNKNOWN);
} else {
displayMode = new DisplayMode(800, 600, 16,
DisplayMode.REFRESH_RATE_UNKNOWN);
}
ImageTest test = new ImageTest();
test.run(displayMode);
}
private SimpleScreenManager screen;
private boolean imagesLoaded;
private Image bgImage;
private Image opaqueImage;
private Image transparentImage;
private Image translucentImage;
private Image antiAliasedImage;
private void run(DisplayMode displayMode) {
setBackground(Color.blue);
setForeground(Color.white);
setFont(new Font("Dialog", Font.PLAIN, 24));
imagesLoaded = false;
screen = new SimpleScreenManager();
try {
screen.setFullScreen(displayMode, this);
loadImages();
try {
Thread.sleep(10000);
} catch (Exception e) {
}
} catch (Exception e) {
} finally {
screen.restoreScreen();
}
}
private void loadImages() {
bgImage = loadImage("/images/background.png");
opaqueImage = loadImage("/images/opaque.png");
transparentImage = loadImage("/images/transparent.png");
translucentImage = loadImage("/images/translucent.png");
antiAliasedImage = loadImage("/images/antialiased.png");
imagesLoaded = true;
repaint();
}
private Image loadImage(String fileName) {
return new ImageIcon(fileName).getImage();
}
public void paint(Graphics g) {
if (g instanceof Graphics2D) {
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
}
g.drawImage(opaqueImage, 0, 0, this);
if (imagesLoaded) {
g.drawImage(bgImage, 0, 0, null);
drawImage(g, opaqueImage, 0, 0, "Opaque");
drawImage(g, transparentImage, 320, 0, "Transparent");
drawImage(g, translucentImage, 0, 300, "Translucent");
drawImage(g, antiAliasedImage, 320, 300,
"Translucent (Anti-Aliased)");
} else {
g.drawString("Loading Images...", 5, 24);
}
}
public void drawImage(Graphics g, Image image, int x, int y, String caption) {
g.drawImage(image, x, y, this);
g.drawString(caption, x + 5, y + 24 + image.getHeight(null));
}
}
沒有錯誤!,程序運行,它顯示文本,但不顯示圖像。 這意味着loadImages()有效,在我的paint方法中一定是個錯誤。 我究竟做錯了什么!?!?
我沒有看到我的路徑有什么問題:
如果您查看ImageIcon
源代碼,您會注意到ImageIcon(String)
構造函數調用另一個構造函數
ImageIcon(String filename, String description) {
image = Toolkit.getDefaultToolkit().getImage(filename);
if (image == null) {
return;
}
this.filename = filename;
this.description = description;
loadImage(image);
}
和.getImage()
public Image getImage() {
return image;
}
如果無法加載圖像,則圖像將為空而不會丟失任何錯誤。 您的代碼無法(靜默地)加載圖像(使用System.out.println(image)
檢查這很可能是因為文件路徑不正確)。
編輯你的評論:我更喜歡ImageIO
加載我的文件,為它提供輸入流。 它更冗長,還有讓我從jar中加載文件的額外好處。 更改
private Image loadImage(String fileName) {
return new ImageIcon(fileName).getImage();
}
至
private Image loadImage(String fileName) {
return ImageIO.read(getClass().getResourceAsStream(fileName));
}
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