调整图纸大小以匹配框架大小 [英] Resize drawing to match frame size

问题描述

我写了一个应用程序，根据固定的像素位置自定义绘制paint（）内的所有内容。然后我禁用框架的大小调整，使其始终可见。

I've written an app that custom draws everything inside paint() based on fixed pixel positions. Then I disabled resize of the frame so its always visible.

但是，现在我希望能够调整它的大小，但我不想更改我的绘制代码。我希望我可以抓住300x300平方的Graphics g对象并在我的所有绘制代码​​之后将其调整为JFrame当前大小，但我不知道我在做什么。

However, now I would like to be able to resize it but I dont want to change my drawling code. I was hoping I could grab the 300x300 square of the Graphics g object and resize it to the JFrame current size after all of my drawling code, but I have no idea what I'm doing.

这里是示例代码。在这里我希望100x100平方保持在中间，与调整大小的JFrame成比例：

Here sample code. In this I want the 100x100 square to remain in the middle, proportionate to the resized JFrame:

package DrawAndScale;

import java.awt.Color;
import java.awt.Graphics;

public class DASFrame extends javax.swing.JFrame {
    public DASFrame() {
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        this.setSize(300, 300);
    }

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new DASFrame().setVisible(true);
            }
        });
    }

    @Override
    public void paint(Graphics g) {
        g.setColor(Color.BLACK);
        g.fill3DRect(100, 100, 100, 100, true);
    }
}

谢谢。

推荐答案

假设您将绘制300x300的方法重命名为paint300，请定义缓冲图像：

Assuming you rename your method that paints for 300x300 as paint300, define a buffered image:

@Override public void paint(Graphics g) {
     Image bufferImage = createImage(300, 300);  // empty image
     paint300(bufferImage.getGraphics());  // fill the image
     g.drawImage(bufferImage, 0, 0, null);  // send the image to graphics device
}

以上是您想要绘制的时间全尺寸（300x300）。
如果您的窗口调整大小：

Above is when you want to draw at full size (300x300). If your window is resized:

@Override public void paint(Graphics g) {
     Image bufferImage = createImage(300, 300);  
     paint300(bufferImage.getGraphics());
     int width = getWidth();
     int height = getHeight(); 
     CropImageFilter crop = 
         new CropImageFilter((300 - width)/2, (300 - height)/2 , width, height);
     FilteredImageSource fis = new FilteredImageSource(bufferImage, crop);
     Image croppedImage = createImage(fis);
     g.drawImage(croppedImage, 0, 0, null);
}

新类来自java.awt.image。*。

The new classes are from from java.awt.image.*.

我没有测试这段代码。只是向你发送正确的方向。

I didn't test this code. It's just to send you in the right direction.

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