用Java绘制像素图像 [英] Painting pixels images in Java

问题描述

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

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.

我试图创建一个只创建像素的自己的组件但是如果我使用for循环创建这样一个250,000倍的像素，这似乎不是非常高效将每个实例添加到JPanels布局。

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);
    }
}

推荐答案

你不需要为此创建一个类。 Java已经拥有优秀的 BufferedImage 类这正是你所需要的。这是一些伪代码：

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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