java 如何创建 Graphics2D 实例？
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How to create a Graphics2D instance?
提问by necromancer
What's the easiest way in Java SE 7to obtain an instance just to plot a few points for debugging? Desktop environment.
在Java SE 7中获取实例以绘制几个调试点的最简单方法是什么？桌面环境。
回答by BLuFeNiX
You could use a BufferedImage:
你可以使用一个BufferedImage：
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics2D = image.createGraphics();
回答by Reimeus
The easiest and safest way is to use to cast the Graphicsreference in paintComponentand cast it as needed. That way the Objectis correctly initialized. This reference can be passed to other custom painting methods as required.
最简单和最安全的方法是使用来转换Graphics引用paintComponent并根据需要进行转换。这样Object就正确初始化了。可以根据需要将此引用传递给其他自定义绘制方法。
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
...
}
回答by greedybuddha
You should probably just create a JPanel and paint on it.
您可能应该创建一个 JPanel 并在其上绘画。
public class MyPanel extends JPanel {
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
.... // my painting
}
}
