因此對於我的項目,我必須使用JLabel
和ImageIcon
將圖形繪製到屏幕上。我已經做了一些研究,但我似乎無法讓它向窗口渲染任何東西。它應該呈現每個20個不同位置的鳥,但屏幕保持空白。這裏是類文件:JLabel在屏幕上不顯示圖像
import javax.swing.*;
import java.awt.*;
import java.io.*;
class Graphics
{
public static final String SIMULATOR_NAME = "Flocking Simulator 2K16";
public static final int MAXIMUM_WIDTH = 1280;
public static final int MAXIMUM_HEIGHT = 780;
static Canvas canvas = new Canvas();
private JFrame frame = new JFrame();
public Graphics()
{
JFrame frame = new JFrame();
frame.setTitle(SIMULATOR_NAME);
frame.setSize(MAXIMUM_WIDTH, MAXIMUM_HEIGHT);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.add(canvas);
}
public void Clear()
{
canvas.clear();
}
public void DrawBirds(Flock birds, String graphic)
{
for (int i = 0; i < birds.GetMaximumBirds(); i++)
{
System.out.printf("Bird#" + i + "\n");
Bird b = birds.GetBird(i);
frame.add(BirdGraphic(b, graphic));
}
}
public JLabel BirdGraphic(Bird bird, String graphic)
{
System.out.printf(System.getProperty("user.dir") + File.separator + graphic + "\n");
ImageIcon birdImage = new ImageIcon(System.getProperty("user.dir") + File.separator + graphic);
JLabel birdLabel = new JLabel(birdImage);
CartesianCoordinate loc = bird.GetPosition();
birdLabel.setLocation((int)Math.floor(loc.getX() + 0.5), (int)Math.floor(loc.getY() + 0.5));
return birdLabel;
}
}
檢查'new File(System.getProperty(「user.dir」)+ File.separator + graphic).exists()'返回'true'。 – Berger
剛剛檢查過它返回'true' – dave
框架如何調用?除了'frame.add(canvas);'我沒有看到任何東西被添加到它。另請提供啓動您的應用程序的主要方法。 – Berger