Question

您好我正在创建一个程序，在Java中的青色背景上创建一个多闪存块。我正在使用JFrames和Canvas，但由于某种原因，即使我指定颜色为青色，它也会使我的背景变黑。但是，如果你移动盒子，如果块用keylistener填充空间中的青色。以下是我认为与问题相关的代码。任何帮助都将非常感谢并感谢您阅读本文。（请注意，这可能是错误的语法和编码，但我的理论是在使代码工作之前使代码工作。）

  GraphicsEnvironment ge =
    GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gd.getDefaultConfiguration();

// Create off-screen drawing surface
BufferedImage bi = gc.createCompatibleImage( 640, 480 );

// Objects needed for rendering...


Graphics graphics = null;
Graphics2D g2d = null;

//Why isn't the background color cyan? (It's black)
Color background = Color.CYAN;
Random rand = new Random();

//The x and y positions are randomly generated as are the length and width
int x = rand.nextInt(640 / 2), y = rand.nextInt(640 / 2);
int w = rand.nextInt( 640/2 );
int h = rand.nextInt( 480/2 );





//To Do: Infinite loops suck, make a death variable
while( true ) {
    try {
    // clear back buffer...      

    g2d = bi.createGraphics();
    g2d.setColor(Color.CYAN);
    g2d.fillRect( -1000, 1000, 1000, 1000 );

    // draw the rectangle...
      int r = rand.nextInt(256);
      int g = rand.nextInt(256);
      int b = rand.nextInt(256);
      g2d.setColor(new Color(r, g, b));
      g2d.fillRect( x, y, w, h );

    //Get the newly drawn rectangles and flip
    graphics = buffer.getDrawGraphics();
    graphics.drawImage(bi, x, y, canvas);

Answer 1

我不确定我完全明白你要做什么。如果你试图让JFrame青色用帆布着色，这就是我所做的：

import java.awt.Canvas;
import java.awt.Color;
import javax.swing.JFrame;

public class test {
    static JFrame frame;
    static Canvas canvas;

    public static void main(String[] args){
        frame  = new JFrame();
        canvas = new Canvas();

        canvas.setBackground(Color.cyan);
        frame.getContentPane().add(canvas);
        frame.setVisible(true);
    }
}

我很确定实际上并不是你想要的。

使用JFrame和Canvas时，背景显示为黑色而不是青色

1 个答案: