在Java中绘制像素图像

发布于 2024-11-29 12:11:50 字数 428 浏览 4 评论 0原文

哪种方法是使用 java 创建像素图像的最佳方法。假设我想创建一个尺寸为 200x200 的像素图像，总共 40.000 像素。如何从随机颜色创建像素并将其渲染在 JFrame 上的给定位置。

我尝试创建一个自己的组件，它只创建像素，但如果我使用 for 循环创建这样一个像素 250.000 次并将每个实例添加到 JPanels 布局中，这似乎性能不是很好。

class Pixel extends JComponent {
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(getRandomColor());
        g.fillRect(0, 0, 1, 1);
    }
}

原文

Which method is the best way to create a pixel image with java.
Say, I want to create a pixel image with the dimensions 200x200 which are 40.000 pixels in total. How can I create a pixel from a random color and render it at a given position on a JFrame.

I tried to create a own component which just creates pixel but it seems that this is not very performant if I create such a pixel a 250.000 times with a for-loop and add each instance to a JPanels layout.

class Pixel extends JComponent {
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(getRandomColor());
        g.fillRect(0, 0, 1, 1);
    }
}

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久光 2024-12-06 12:11:50

您不需要为此创建一个类。 Java 已经有了优秀的 BufferedImage 类这正是你所需要的。这是一些伪代码：

int w = 10;
int h = 10;
int type = BufferedImage.TYPE_INT_ARGB;

BufferedImage image = new BufferedImage(w, h, type);

int color = 255; // RGBA value, each component in a byte

for(int x = 0; x < w; x++) {
    for(int y = 0; y < h; y++) {
        image.setRGB(x, y, color);
    }
}

// Do something with image

You do not need to create a class for this. Java already has the excellent BufferedImage class that does exactly what you need. Here is some pseudo-code:

int w = 10;
int h = 10;
int type = BufferedImage.TYPE_INT_ARGB;

BufferedImage image = new BufferedImage(w, h, type);

int color = 255; // RGBA value, each component in a byte

for(int x = 0; x < w; x++) {
    for(int y = 0; y < h; y++) {
        image.setRGB(x, y, color);
    }
}

// Do something with image

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忆沫 2024-12-06 12:11:50

这里的关键是 Canvas 类。它是允许任意绘制操作的标准Component。为了使用它，您必须子类化 Canvas 类并重写 paint(Graphics g) 方法，然后循环遍历每个像素并绘制随机颜色。以下代码应该可以工作：

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.util.Random;

import javax.swing.JFrame;

public class PixelCanvas extends Canvas {
    private static final int WIDTH = 400;
    private static final int HEIGHT = 400;
    private static final Random random = new Random();

    @Override
    public void paint(Graphics g) {
        super.paint(g);

        for(int x = 0; x < WIDTH; x++) {
            for(int y = 0; y < HEIGHT; y++) {
                g.setColor(randomColor());
                g.drawLine(x, y, x, y);
            }
        }
    }

    private Color randomColor() {
        return new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256));
    }

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

        frame.setSize(WIDTH, HEIGHT);
        frame.add(new PixelCanvas());

        frame.setVisible(true);
    }
}

生成的图像如下所示：

Noise Image

The key here is the Canvas class. It is the standard Component that allows arbitrary draw operations. In order to use it, you must subclass the Canvas class and override the paint(Graphics g) method, then loop through each pixel and draw your random color. The following code should work:

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.util.Random;

import javax.swing.JFrame;

public class PixelCanvas extends Canvas {
    private static final int WIDTH = 400;
    private static final int HEIGHT = 400;
    private static final Random random = new Random();

    @Override
    public void paint(Graphics g) {
        super.paint(g);

        for(int x = 0; x < WIDTH; x++) {
            for(int y = 0; y < HEIGHT; y++) {
                g.setColor(randomColor());
                g.drawLine(x, y, x, y);
            }
        }
    }

    private Color randomColor() {
        return new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256));
    }

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

        frame.setSize(WIDTH, HEIGHT);
        frame.add(new PixelCanvas());

        frame.setVisible(true);
    }
}

The generated image looks like this:

Noise Image

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